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Original analysis of NOAA and Census data

San Antonio fireplace weather: how often it gets cold enough

From 1996-97 to 2024-25, San Antonio International Airport logged a low of 45F or colder on about 76 nights a winter and a freeze on about 14. Every one of the 29 winters had at least one freezing night. The coldest was 9F on February 15, 2021.

October of winter 1996-97: 2 nights at or below 45F, coldest 36FNovember of winter 1996-97: 11 nights at or below 45F, coldest 30FDecember of winter 1996-97: 17 nights at or below 45F, coldest 18FJanuary of winter 1996-97: 21 nights at or below 45F, coldest 24FFebruary of winter 1996-97: 18 nights at or below 45F, coldest 32FMarch of winter 1996-97: 5 nights at or below 45F, coldest 38FOctober of winter 1997-98: 2 nights at or below 45F, coldest 37FNovember of winter 1997-98: 16 nights at or below 45F, coldest 33FDecember of winter 1997-98: 29 nights at or below 45F, coldest 22FJanuary of winter 1997-98: 16 nights at or below 45F, coldest 32FFebruary of winter 1997-98: 20 nights at or below 45F, coldest 35FMarch of winter 1997-98: 12 nights at or below 45F, coldest 32FOctober of winter 1998-99: 1 night at or below 45F, coldest 45FNovember of winter 1998-99: 1 night at or below 45F, coldest 45FDecember of winter 1998-99: 22 nights at or below 45F, coldest 23FJanuary of winter 1998-99: 20 nights at or below 45F, coldest 23FFebruary of winter 1998-99: 12 nights at or below 45F, coldest 29FMarch of winter 1998-99: 8 nights at or below 45F, coldest 32FOctober of winter 1999-00: 5 nights at or below 45F, coldest 41FNovember of winter 1999-00: 8 nights at or below 45F, coldest 31FDecember of winter 1999-00: 24 nights at or below 45F, coldest 25FJanuary of winter 1999-00: 17 nights at or below 45F, coldest 23FFebruary of winter 1999-00: 9 nights at or below 45F, coldest 32FMarch of winter 1999-00: 5 nights at or below 45F, coldest 34FOctober of winter 2000-01: 3 nights at or below 45F, coldest 40FNovember of winter 2000-01: 14 nights at or below 45F, coldest 33FDecember of winter 2000-01: 27 nights at or below 45F, coldest 28FJanuary of winter 2000-01: 25 nights at or below 45F, coldest 26FFebruary of winter 2000-01: 14 nights at or below 45F, coldest 31FMarch of winter 2000-01: 13 nights at or below 45F, coldest 34FOctober of winter 2001-02: 2 nights at or below 45F, coldest 40FNovember of winter 2001-02: 7 nights at or below 45F, coldest 30FDecember of winter 2001-02: 21 nights at or below 45F, coldest 30FJanuary of winter 2001-02: 21 nights at or below 45F, coldest 22FFebruary of winter 2001-02: 24 nights at or below 45F, coldest 17FMarch of winter 2001-02: 12 nights at or below 45F, coldest 19FOctober of winter 2002-03: 0 nights at or below 45F, coldest 48FNovember of winter 2002-03: 13 nights at or below 45F, coldest 35FDecember of winter 2002-03: 22 nights at or below 45F, coldest 31FJanuary of winter 2002-03: 25 nights at or below 45F, coldest 25FFebruary of winter 2002-03: 16 nights at or below 45F, coldest 27FMarch of winter 2002-03: 10 nights at or below 45F, coldest 30FOctober of winter 2003-04: 1 night at or below 45F, coldest 45FNovember of winter 2003-04: 8 nights at or below 45F, coldest 29FDecember of winter 2003-04: 21 nights at or below 45F, coldest 27FJanuary of winter 2003-04: 17 nights at or below 45F, coldest 29FFebruary of winter 2003-04: 17 nights at or below 45F, coldest 29FMarch of winter 2003-04: 2 nights at or below 45F, coldest 44FOctober of winter 2004-05: 0 nights at or below 45F, coldest 49FNovember of winter 2004-05: 8 nights at or below 45F, coldest 35FDecember of winter 2004-05: 21 nights at or below 45F, coldest 24FJanuary of winter 2004-05: 18 nights at or below 45F, coldest 29FFebruary of winter 2004-05: 10 nights at or below 45F, coldest 35FMarch of winter 2004-05: 9 nights at or below 45F, coldest 33FOctober of winter 2005-06: 3 nights at or below 45F, coldest 37FNovember of winter 2005-06: 13 nights at or below 45F, coldest 31FDecember of winter 2005-06: 25 nights at or below 45F, coldest 27FJanuary of winter 2005-06: 18 nights at or below 45F, coldest 32FFebruary of winter 2005-06: 17 nights at or below 45F, coldest 23FMarch of winter 2005-06: 7 nights at or below 45F, coldest 32FOctober of winter 2006-07: 2 nights at or below 45F, coldest 43FNovember of winter 2006-07: 9 nights at or below 45F, coldest 35FDecember of winter 2006-07: 19 nights at or below 45F, coldest 29FJanuary of winter 2006-07: 25 nights at or below 45F, coldest 29FFebruary of winter 2006-07: 17 nights at or below 45F, coldest 24FMarch of winter 2006-07: 6 nights at or below 45F, coldest 30FOctober of winter 2007-08: 2 nights at or below 45F, coldest 42FNovember of winter 2007-08: 8 nights at or below 45F, coldest 32FDecember of winter 2007-08: 20 nights at or below 45F, coldest 28FJanuary of winter 2007-08: 24 nights at or below 45F, coldest 26FFebruary of winter 2007-08: 13 nights at or below 45F, coldest 28FMarch of winter 2007-08: 10 nights at or below 45F, coldest 32FOctober of winter 2008-09: 4 nights at or below 45F, coldest 39FNovember of winter 2008-09: 10 nights at or below 45F, coldest 33FDecember of winter 2008-09: 20 nights at or below 45F, coldest 30FJanuary of winter 2008-09: 22 nights at or below 45F, coldest 28FFebruary of winter 2008-09: 7 nights at or below 45F, coldest 30FMarch of winter 2008-09: 10 nights at or below 45F, coldest 34FOctober of winter 2009-10: 1 night at or below 45F, coldest 41FNovember of winter 2009-10: 9 nights at or below 45F, coldest 38FDecember of winter 2009-10: 26 nights at or below 45F, coldest 23FJanuary of winter 2009-10: 22 nights at or below 45F, coldest 16FFebruary of winter 2009-10: 22 nights at or below 45F, coldest 29FMarch of winter 2009-10: 14 nights at or below 45F, coldest 35FOctober of winter 2010-11: 2 nights at or below 45F, coldest 38FNovember of winter 2010-11: 11 nights at or below 45F, coldest 28FDecember of winter 2010-11: 19 nights at or below 45F, coldest 27FJanuary of winter 2010-11: 25 nights at or below 45F, coldest 27FFebruary of winter 2010-11: 15 nights at or below 45F, coldest 19FMarch of winter 2010-11: 6 nights at or below 45F, coldest 33FOctober of winter 2011-12: 2 nights at or below 45F, coldest 40FNovember of winter 2011-12: 10 nights at or below 45F, coldest 31FDecember of winter 2011-12: 18 nights at or below 45F, coldest 27FJanuary of winter 2011-12: 18 nights at or below 45F, coldest 30FFebruary of winter 2011-12: 13 nights at or below 45F, coldest 32FMarch of winter 2011-12: 4 nights at or below 45F, coldest 37FOctober of winter 2012-13: 2 nights at or below 45F, coldest 41FNovember of winter 2012-13: 6 nights at or below 45F, coldest 38FDecember of winter 2012-13: 16 nights at or below 45F, coldest 27FJanuary of winter 2012-13: 20 nights at or below 45F, coldest 29FFebruary of winter 2012-13: 12 nights at or below 45F, coldest 31FMarch of winter 2012-13: 13 nights at or below 45F, coldest 33FOctober of winter 2013-14: 0 nights at or below 45F, coldest 46FNovember of winter 2013-14: 10 nights at or below 45F, coldest 33FDecember of winter 2013-14: 20 nights at or below 45F, coldest 29FJanuary of winter 2013-14: 26 nights at or below 45F, coldest 22FFebruary of winter 2013-14: 15 nights at or below 45F, coldest 29FMarch of winter 2013-14: 13 nights at or below 45F, coldest 27FOctober of winter 2014-15: 0 nights at or below 45F, coldest 51FNovember of winter 2014-15: 15 nights at or below 45F, coldest 31FDecember of winter 2014-15: 10 nights at or below 45F, coldest 31FJanuary of winter 2014-15: 27 nights at or below 45F, coldest 28FFebruary of winter 2014-15: 16 nights at or below 45F, coldest 32FMarch of winter 2014-15: 8 nights at or below 45F, coldest 31FOctober of winter 2015-16: 0 nights at or below 45F, coldest 52FNovember of winter 2015-16: 8 nights at or below 45F, coldest 33FDecember of winter 2015-16: 17 nights at or below 45F, coldest 34FJanuary of winter 2015-16: 25 nights at or below 45F, coldest 30FFebruary of winter 2015-16: 15 nights at or below 45F, coldest 30FMarch of winter 2015-16: 3 nights at or below 45F, coldest 36FOctober of winter 2016-17: 0 nights at or below 45F, coldest 46FNovember of winter 2016-17: 3 nights at or below 45F, coldest 34FDecember of winter 2016-17: 13 nights at or below 45F, coldest 25FJanuary of winter 2016-17: 14 nights at or below 45F, coldest 19FFebruary of winter 2016-17: 3 nights at or below 45F, coldest 37FMarch of winter 2016-17: 1 night at or below 45F, coldest 45FOctober of winter 2017-18: 4 nights at or below 45F, coldest 36FNovember of winter 2017-18: 6 nights at or below 45F, coldest 36FDecember of winter 2017-18: 21 nights at or below 45F, coldest 28FJanuary of winter 2017-18: 25 nights at or below 45F, coldest 21FFebruary of winter 2017-18: 8 nights at or below 45F, coldest 30FMarch of winter 2017-18: 1 night at or below 45F, coldest 45FOctober of winter 2018-19: 1 night at or below 45F, coldest 45FNovember of winter 2018-19: 13 nights at or below 45F, coldest 23FDecember of winter 2018-19: 21 nights at or below 45F, coldest 33FJanuary of winter 2018-19: 21 nights at or below 45F, coldest 29FFebruary of winter 2018-19: 9 nights at or below 45F, coldest 32FMarch of winter 2018-19: 9 nights at or below 45F, coldest 28FOctober of winter 2019-20: 5 nights at or below 45F, coldest 34FNovember of winter 2019-20: 15 nights at or below 45F, coldest 32FDecember of winter 2019-20: 21 nights at or below 45F, coldest 27FJanuary of winter 2019-20: 16 nights at or below 45F, coldest 34FFebruary of winter 2019-20: 18 nights at or below 45F, coldest 29FMarch of winter 2019-20: 0 nights at or below 45F, coldest 47FOctober of winter 2020-21: 6 nights at or below 45F, coldest 40FNovember of winter 2020-21: 6 nights at or below 45F, coldest 34FDecember of winter 2020-21: 25 nights at or below 45F, coldest 28FJanuary of winter 2020-21: 20 nights at or below 45F, coldest 29FFebruary of winter 2020-21: 18 nights at or below 45F, coldest 9FMarch of winter 2020-21: 7 nights at or below 45F, coldest 38FOctober of winter 2021-22: 0 nights at or below 45F, coldest 46FNovember of winter 2021-22: 10 nights at or below 45F, coldest 38FDecember of winter 2021-22: 9 nights at or below 45F, coldest 34FJanuary of winter 2021-22: 25 nights at or below 45F, coldest 26FFebruary of winter 2021-22: 24 nights at or below 45F, coldest 21FMarch of winter 2021-22: 15 nights at or below 45F, coldest 26FOctober of winter 2022-23: 0 nights at or below 45F, coldest 46FNovember of winter 2022-23: 11 nights at or below 45F, coldest 38FDecember of winter 2022-23: 17 nights at or below 45F, coldest 16FJanuary of winter 2022-23: 12 nights at or below 45F, coldest 31FFebruary of winter 2022-23: 15 nights at or below 45F, coldest 31FMarch of winter 2022-23: 5 nights at or below 45F, coldest 40FOctober of winter 2023-24: 3 nights at or below 45F, coldest 42FNovember of winter 2023-24: 6 nights at or below 45F, coldest 38FDecember of winter 2023-24: 15 nights at or below 45F, coldest 31FJanuary of winter 2023-24: 25 nights at or below 45F, coldest 18FFebruary of winter 2023-24: 9 nights at or below 45F, coldest 32FMarch of winter 2023-24: 2 nights at or below 45F, coldest 41FOctober of winter 2024-25: 0 nights at or below 45F, coldest 54FNovember of winter 2024-25: 6 nights at or below 45F, coldest 39FDecember of winter 2024-25: 8 nights at or below 45F, coldest 32FJanuary of winter 2024-25: 21 nights at or below 45F, coldest 24FFebruary of winter 2024-25: 15 nights at or below 45F, coldest 21FMarch of winter 2024-25: 6 nights at or below 45F, coldest 40FOctober of winter 2025-26: 2 nights at or below 45F, coldest 40FNovember of winter 2025-26: 2 nights at or below 45F, coldest 38FDecember of winter 2025-26: 15 nights at or below 45F, coldest 34FJanuary of winter 2025-26: 18 nights at or below 45F, coldest 20FFebruary of winter 2025-26: 9 nights at or below 45F, coldest 27FMarch of winter 2025-26: 3 nights at or below 45F, coldest 36F
Each column is one winter, October to March, labeled by the year it starts. The darker the square, the more nights the low reached 45F or colder that month at San Antonio International Airport.none1 to 67 to 1213 to 1920 +NOAA NCEI GHCN-Daily.

Fireplace nights each winter: lows of 45F or colder

1996-97: 77 nights19961997-98: 99 nights1998-99: 68 nights1999-00: 70 nights2000-01: 96 nights2001-02: 87 nights20012002-03: 88 nights2003-04: 69 nights2004-05: 69 nights2005-06: 83 nights2006-07: 83 nights20062007-08: 81 nights2008-09: 76 nights2009-10: 96 nights2010-11: 79 nights2011-12: 65 nights20112012-13: 73 nights2013-14: 87 nights2014-15: 76 nights2015-16: 70 nights2016-17: 35 nights20162017-18: 68 nights2018-19: 77 nights2019-20: 76 nights2020-21: 82 nights2021-22: 84 nights20212022-23: 60 nights2023-24: 61 nights2024-25: 59 nights2025-26: 49 nights492025average: 75.7
San Antonio International Airport. Source: NOAA NCEI GHCN-Daily.

Nights at or below freezing each winter, San Antonio

1996-97: 19 nights19961997-98: 11 nights1998-99: 14 nights1999-00: 13 nights2000-01: 19 nights2001-02: 24 nights2420012002-03: 11 nights2003-04: 22 nights2004-05: 10 nights2005-06: 13 nights2006-07: 14 nights20062007-08: 14 nights2008-09: 12 nights2009-10: 19 nights2010-11: 22 nights2011-12: 9 nights20112012-13: 13 nights2013-14: 22 nights2014-15: 9 nights2015-16: 4 nights2016-17: 5 nights20162017-18: 12 nights2018-19: 10 nights2019-20: 6 nights2020-21: 16 nights2021-22: 22 nights20212022-23: 10 nights2023-24: 9 nights2024-25: 15 nights2025-26: 8 nights2025average: 13.8
Low of 32F or colder at San Antonio International Airport, July to June winters, 1996-97 to 2025-26. Source: NOAA NCEI GHCN-Daily.

What we found

Average nights at or below 45F, by month, San Antonio

Oct: 1.8 nightsOctNov: 9.3 nightsNovDec: 19.4 nightsDecJan: 21.1 nights21.1JanFeb: 14.5 nightsFebMar: 7.4 nightsMarApr: 1.9 nightsApr
San Antonio International Airport, winters 1996-97 to 2024-25 average. Source: NOAA NCEI GHCN-Daily.
A stack of split firewood seen end on
Split and stacked under cover. Wood under 20 percent moisture burns cleaner and leaves less creosote. Photo: Clay Banks / Unsplash

By winter, San Antonio International Airport

WinterNights 45F or colderFreezing nightsNights 25F or colderColdest nightFirst freezeHeating degree days
2025-26498320F, January 26, 2026January 18, 2026870
2024-255915421F, February 20, 2025December 12, 20241,107
2023-24619418F, January 17, 2024December 11, 20231,220
2022-236010416F, December 23, 2022December 22, 20221,218
2021-228422321F, February 4, 2022January 2, 20221,336
2020-21821659F, February 15, 2021December 1, 20201,388
2019-20766027F, December 19, 2019November 1, 20191,240
2018-197710123F, November 14, 2018November 13, 20181,574
2017-186812221F, January 3, 2018December 7, 20171,337
2016-17355419F, January 8, 2017December 18, 2016800
2015-16704030F, January 23, 2016January 23, 20161,067
2014-15769028F, January 8, 2015November 17, 20141,530
2013-148722122F, January 7, 2014December 6, 20131,599
2012-137313027F, December 21, 2012December 11, 20121,236
2011-12659027F, December 7, 2011November 11, 20111,160
2010-117922819F, February 2, 2011November 27, 20101,395
2009-109619516F, January 9, 2010December 4, 20091,838
2008-097612028F, January 14, 2009December 6, 20081,084
2007-088114026F, January 20, 2008November 26, 20071,212
2006-078314124F, February 16, 2007December 1, 20061,480
2005-068313123F, February 12, 2006November 29, 20051,112
2004-056910124F, December 25, 2004December 1, 20041,277
2003-046922027F, December 30, 2003November 24, 20031,319
2002-038811125F, January 18, 2003December 6, 20021,602
2001-028724517F, February 27, 2002November 28, 20011,537
2000-019619026F, January 20, 2001December 7, 20001,940
1999-007013223F, January 5, 2000November 26, 19991,075
1998-996814323F, December 26, 1998December 22, 19981,182
1997-989911122F, December 13, 1997December 12, 19971,559
1996-977719518F, December 19, 1996November 25, 19961,582

Homes by ZIP code

Housing age is a rough guide to what kind of chimney a house has. Most homes built before 1980 that have a fireplace have a masonry chimney; most built since the 1990s have a factory-built fireplace with a metal flue. The Census does not count fireplaces, so this table can only show the housing around them.

ZIPAreaHousing unitsMedian year builtBuilt before 1980Built 2000 or laterSingle-family detachedHeat with gasOwner occupiedMedian home value
78201Jefferson / Woodlawn Lake18,416195287%6%62%25%49%$197,800
78202Dignowity Hill5,408195768%26%70%32%56%$234,700
78203East Side2,392195370%16%69%32%45%$158,000
78204Southtown / King William6,402195763%32%57%27%45%$173,100
78205Downtown1,867193856%41%1%10%9%$604,600
78207West Side18,637195876%14%62%34%40%$106,700
78208Government Hill2,226196460%24%47%39%33%$146,600
78209Alamo Heights / Terrell Hills23,033196864%19%45%36%50%$497,000
78210Highland Park / Mission Reach14,354194779%13%70%38%61%$189,400
78211Harlandale10,490196669%22%85%47%61%$118,300
78212Monte Vista / Olmos Park13,534194983%8%51%28%47%$330,600
78213Castle Hills18,120196963%8%56%21%49%$216,400
78214South Side8,445195579%9%73%35%56%$128,800
78215Tobin Hill3,259201412%81%3%9%2%$476,500
78216Airport / North Central22,027197951%11%36%19%35%$310,700
78217Northeast / Windcrest16,408198050%15%44%33%45%$242,300
78218Northeast Side16,121198050%28%54%34%48%$190,900
78219Kirby6,782198049%28%60%32%54%$162,000
78220East Side / Eastwood7,376196771%17%73%41%53%$143,700
78221South Side / Mission San Juan15,141197457%30%79%37%70%$171,200
78222Southeast Side9,968199234%42%71%31%72%$199,500
78223Highland Hills / Brooks22,802197754%35%65%31%58%$172,600
78224Southwest7,625199442%47%60%28%58%$162,200
78225Las Palmas5,471195090%6%88%47%65%$119,600
78226Port San Antonio3,003196272%12%41%26%38%$107,100
78227Far West15,770197465%15%70%32%59%$159,700
78228Northwest / Deco District21,432196773%10%70%39%59%$174,900
78229Medical Center19,228198439%21%9%17%14%$228,900
78230Medical Center / Colonies North21,269198539%21%47%32%49%$386,600
78231Shavano Park4,083198724%20%72%49%66%$401,800
78232Hollywood Park / Thousand Oaks16,587198536%15%58%34%56%$362,000
78233Northeast / Live Oak19,859198641%37%69%32%60%$220,800
78237West Side / Edgewood13,144196668%17%79%33%61%$115,500
78238Leon Valley11,686198052%25%46%32%45%$209,700
78239Windcrest / Camelot10,091198049%23%75%32%74%$229,200
78240Oak Hills / UTSA area28,440199023%32%32%22%34%$257,500
78242Southwest Side11,436197954%29%71%26%54%$148,200
78244Northeast / Kirby13,033200110%53%86%14%74%$216,300
78245Far West / Westover Hills33,173200811%67%78%18%69%$260,300
78247Northeast / Encino Park20,359199217%33%84%26%77%$275,500
78248Hunters Creek / Churchill6,15719938%17%73%44%73%$479,500
78249UTSA / Northwest24,772200111%51%58%24%51%$305,400
78250Northwest / Guilbeau20,537198815%19%85%27%73%$235,000
78251Far West / Westover23,49120029%59%56%21%51%$268,300
78253Alamo Ranch25,18820134%86%79%32%77%$360,000
78254Northwest / Bandera Road25,84220085%74%92%30%82%$320,800
78255Scenic Loop / Dominion area6,27020087%77%87%43%85%$531,400
78256Camp Bullis / Dominion7,14320122%83%25%20%30%$579,300
78257The Dominion / Fair Oaks edge6,86720131%90%28%32%36%$670,400
78258Stone Oak20,89520052%70%59%27%55%$480,500
78259Stone Oak / Encino Park11,77920053%67%67%16%65%$380,800
78260Timberwood Park / Bulverde edge12,54420082%83%86%37%87%$498,100
78261Northeast Bexar / Bulverde edge9,48320112%94%87%38%80%$430,200
78023Helotes9,80320057%74%93%39%89%$412,900
78006Boerne17,422200317%59%78%27%77%$543,900
78015Fair Oaks Ranch8,48620113%73%95%36%94%$492,400
78130New Braunfels44,789200520%60%68%20%66%$323,200
78132New Braunfels west / Gruene15,43120118%78%84%25%88%$620,300
78154Schertz16,332200315%59%80%15%72%$318,700
78108Cibolo16,64020087%78%92%12%84%$337,600
78148Universal City9,041198344%25%61%40%53%$267,000
78109Converse21,50720088%68%85%23%75%$252,500

Area names are our shorthand for the main neighborhood or town in each ZIP. Census ACS 2020-2024 5-year estimates (tables B25034, B25035, B25024, B25040, B25003, B25077). "Heat with gas" counts utility and bottled gas as the main heating fuel. Only 543 of 824,130 occupied homes in these ZIPs list wood as their main heat. Click a column to sort.

Planning to light it this winter?

The records say how often it gets cold here. Only an inspection says whether your chimney is safe to use. Tell us your ZIP and what kind of fireplace you have, and a local chimney company calls you back.

Ask what the visit costs before they come, and ask for photos of the flue either way.

Get a chimney pro to look at it

What do you need? Pick any

How we built this

Weather. NOAA NCEI Global Historical Climatology Network daily file for San Antonio International Airport (station USW00012921), downloaded October 29, 2026 with data through October 24, 2026. Temperatures converted from tenths of a degree Celsius to whole degrees Fahrenheit. A winter runs July 1 to June 30. Averages use the 29 complete winters from 1996-97 to 2024-25; 2025-26 is shown in the charts and table but not in the averages. Heating degree days are 65F minus the day's mean of high and low, summed.

Homes. US Census American Community Survey 2020-2024 5-year estimates by ZIP Code Tabulation Area, via Census Reporter.

Limits. One airport station stands in for the whole metro. Low-lying spots and the Hill Country side (Boerne and Helotes) often run colder on a clear night; downtown runs warmer. The Census does not ask about fireplaces or chimneys, so nothing here says whether a given house has one or whether it is safe. Only an inspection does that.

Using this data. Feel free to quote or republish this data under CC BY 4.0, with a link to this page.