San Antonio Intl AP Weather Records (USW00012921)
Record envelope, standing records and threshold days for San Antonio Intl AP (USW00012921), Texas, United States, with 81 years of record.
Key Facts for San Antonio Intl AP
- San Antonio Intl AP (USW00012921) is a weather station in Texas, United States at 29.54 latitude and -98.48 longitude, 244 m (799 ft) above sea level.
- The station reports from 1946 to 2026, 81 years of record.
- 1,464 records set at San Antonio Intl AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- San Antonio Intl AP set a daily record precipitation of 53.8 mm (2.1 in) on 1 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Texas, United States, 29.54 latitude, -98.48 longitude.
- Elevation: 244 m (799 ft).
- Period of record: 1946 to 2026, 81 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
18 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 31.7 C (89.1 F) | -17.8 C (0.0 F) | 31.7 C (89.1 F) | -6.7 C (19.9 F) |
| Feb | 37.8 C (100.0 F) | -14.4 C (6.1 F) | 35.0 C (95.0 F) | -2.8 C (27.0 F) |
| Mar | 37.8 C (100.0 F) | -7.2 C (19.0 F) | 36.7 C (98.1 F) | 2.2 C (36.0 F) |
| Apr | 38.3 C (100.9 F) | -0.6 C (30.9 F) | 33.3 C (91.9 F) | 8.9 C (48.0 F) |
| May | 40.0 C (104.0 F) | 5.6 C (42.1 F) | 32.8 C (91.0 F) | 10.0 C (50.0 F) |
| Jun | 42.2 C (108.0 F) | 11.7 C (53.1 F) | 35.6 C (96.1 F) | 21.1 C (70.0 F) |
| Jul | 41.7 C (107.1 F) | 16.7 C (62.1 F) | 37.8 C (100.0 F) | 22.2 C (72.0 F) |
| Aug | 43.3 C (109.9 F) | 16.1 C (61.0 F) | 39.4 C (102.9 F) | 22.2 C (72.0 F) |
| Sep | 43.9 C (111.0 F) | 7.8 C (46.0 F) | 38.3 C (100.9 F) | 21.7 C (71.1 F) |
| Oct | 37.2 C (99.0 F) | -2.8 C (27.0 F) | 32.2 C (90.0 F) | 15.6 C (60.1 F) |
| Nov | 34.4 C (93.9 F) | -6.1 C (21.0 F) | n/a | n/a |
| Dec | 32.2 C (90.0 F) | -14.4 C (6.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1946 | 5 |
| 1947 | 31 |
| 1948 | 23 |
| 1949 | 16 |
| 1950 | 19 |
| 1951 | 20 |
| 1952 | 18 |
| 1953 | 13 |
| 1954 | 20 |
| 1955 | 19 |
| 1956 | 5 |
| 1957 | 15 |
| 1958 | 10 |
| 1959 | 18 |
| 1960 | 13 |
| 1961 | 10 |
| 1962 | 18 |
| 1963 | 12 |
| 1964 | 16 |
| 1965 | 23 |
| 1966 | 25 |
| 1967 | 29 |
| 1968 | 17 |
| 1969 | 10 |
| 1970 | 21 |
| 1971 | 23 |
| 1972 | 20 |
| 1973 | 17 |
| 1974 | 31 |
| 1975 | 22 |
| 1976 | 31 |
| 1977 | 9 |
| 1978 | 13 |
| 1979 | 23 |
| 1980 | 25 |
| 1981 | 12 |
| 1982 | 23 |
| 1983 | 29 |
| 1984 | 19 |
| 1985 | 16 |
| 1986 | 14 |
| 1987 | 14 |
| 1988 | 11 |
| 1989 | 36 |
| 1990 | 13 |
| 1991 | 21 |
| 1992 | 11 |
| 1993 | 14 |
| 1994 | 15 |
| 1995 | 18 |
| 1996 | 22 |
| 1997 | 11 |
| 1998 | 18 |
| 1999 | 9 |
| 2000 | 24 |
| 2001 | 10 |
| 2002 | 8 |
| 2003 | 10 |
| 2004 | 13 |
| 2005 | 15 |
| 2006 | 13 |
| 2007 | 18 |
| 2008 | 21 |
| 2009 | 25 |
| 2010 | 11 |
| 2011 | 26 |
| 2012 | 9 |
| 2013 | 22 |
| 2014 | 17 |
| 2015 | 13 |
| 2016 | 10 |
| 2017 | 17 |
| 2018 | 14 |
| 2019 | 23 |
| 2020 | 16 |
| 2021 | 19 |
| 2022 | 25 |
| 2023 | 42 |
| 2024 | 28 |
| 2025 | 30 |
| 2026 | 19 |
All-Time Record Progression
7 new records| Date | Kind | Detail |
|---|---|---|
| 1980-08-05 | Record high minimum temperature | Record high minimum temperature 27.8 C (82.0 F) |
| 1985-01-12 | Record daily snowfall | Record daily snowfall 33.5 cm (13.2 in) |
| 1985-01-13 | Record snow depth | Record snow depth 22.9 cm (9.0 in) |
| 1986-08-19 | Record high maximum temperature | Record high maximum temperature 42.2 C (108.0 F) |
| 1998-10-17 | Record daily precipitation | Record daily precipitation 286.0 mm (11.3 in) |
| 2000-09-04 | Record high maximum temperature | Record high maximum temperature 42.8 C (109.0 F) |
| 2000-09-05 | Record high maximum temperature | Record high maximum temperature 43.9 C (111.0 F) |
Wettest Day of Each Month
Oct: 286.0 mm (11.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 74.7 mm (2.9 in) | 25 January 2012 |
| Feb | 62.0 mm (2.4 in) | 3 February 1986 |
| Mar | 89.2 mm (3.5 in) | 28 March 2018 |
| Apr | 112.3 mm (4.4 in) | 20 April 2026 |
| May | 250.7 mm (9.9 in) | 25 May 2013 |
| Jun | 157.0 mm (6.2 in) | 3 June 1951 |
| Jul | 241.8 mm (9.5 in) | 1 July 2002 |
| Aug | 145.5 mm (5.7 in) | 16 August 2007 |
| Sep | 166.1 mm (6.5 in) | 26 September 1973 |
| Oct | 286.0 mm (11.3 in) | 17 October 1998 |
| Nov | 123.7 mm (4.9 in) | 1 November 1977 |
| Dec | 151.6 mm (6.0 in) | 19 December 1991 |
Period of Record Coverage
1946 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1946 | 122 | 33% | No |
| 1947 | 365 | 100% | Yes |
| 1948 | 366 | 100% | Yes |
| 1949 | 365 | 100% | Yes |
| 1950 | 365 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 366 | 100% | Yes |
| 1957 | 365 | 100% | Yes |
| 1958 | 365 | 100% | Yes |
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 283 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 1 October 2026 | San Antonio Intl AP, US | daily rain (Provisional) | 53.8 mm (2.1 in) | 25.6 mm (1.0 in) | 68 years | 39 of 100 (Notable) |
| 30 September 2026 | San Antonio Intl AP, US | daily high min (Tie, Provisional) | 25.6 C (78.1 F) | tie | 7 years | 2 of 100 (Routine) |
| 29 September 2026 | San Antonio Intl AP, US | daily high max (Tie, Provisional) | 36.1 C (97.0 F) | tie | 7 years | 2 of 100 (Routine) |
| 21 September 2026 | San Antonio Intl AP, US | daily high max (Provisional) | 37.2 C (99.0 F) | 0.5 C (0.9 F) | 3 years | 9 of 100 (Routine) |
| 17 September 2026 | San Antonio Intl AP, US | daily high max (Tie, Provisional) | 36.7 C (98.1 F) | tie | 28 years | 4 of 100 (Routine) |
| 15 September 2026 | San Antonio Intl AP, US | daily high max (Provisional) | 38.3 C (100.9 F) | 1.6 C (2.9 F) | 72 years | 33 of 100 (Routine) |
| 15 September 2026 | San Antonio Intl AP, US | daily high min (Tie, Provisional) | 26.1 C (79.0 F) | tie | 39 years | 4 of 100 (Routine) |
| 14 September 2026 | San Antonio Intl AP, US | daily high min (Provisional) | 26.7 C (80.1 F) | 1.1 C (2.0 F) | 76 years | 33 of 100 (Routine) |
| 14 September 2026 | San Antonio Intl AP, US | daily high max (Provisional) | 37.8 C (100.0 F) | 0.6 C (1.1 F) | 15 years | 13 of 100 (Routine) |
| 13 September 2026 | San Antonio Intl AP, US | daily high min (Tie, Provisional) | 26.1 C (79.0 F) | tie | 32 years | 4 of 100 (Routine) |
| 13 September 2026 | San Antonio Intl AP, US | daily high max (Tie, Provisional) | 37.8 C (100.0 F) | tie | 17 years | 3 of 100 (Routine) |
| 12 September 2026 | San Antonio Intl AP, US | daily high min (Provisional) | 26.1 C (79.0 F) | 0.5 C (0.9 F) | 76 years | 32 of 100 (Routine) |
| 11 September 2026 | San Antonio Intl AP, US | daily high max (Tie, Provisional) | 37.8 C (100.0 F) | tie | 25 years | 3 of 100 (Routine) |
| 11 September 2026 | San Antonio Intl AP, US | daily high min (Tie, Provisional) | 26.1 C (79.0 F) | tie | 12 years | 2 of 100 (Routine) |
| 9 September 2026 | San Antonio Intl AP, US | daily high min (Tie, Provisional) | 25.6 C (78.1 F) | tie | 52 years | 5 of 100 (Routine) |
| 4 September 2026 | San Antonio Intl AP, US | daily high min (Tie, Provisional) | 26.7 C (80.1 F) | tie | 3 years | 2 of 100 (Routine) |
| 3 September 2026 | San Antonio Intl AP, US | monthly high min (Provisional) | 27.2 C (81.0 F) | 0.5 C (0.9 F) | 45 years | 32 of 100 (Routine) |
| 28 August 2026 | San Antonio Intl AP, US | daily rain (Provisional) | 42.9 mm (1.7 in) | 0.5 mm (0.02 in) | 52 years | 23 of 100 (Routine) |
| 23 July 2026 | San Antonio Intl AP, US | daily high min | 27.2 C (81.0 F) | 0.5 C (0.9 F) | 12 years | 14 of 100 (Routine) |
| 14 July 2026 | San Antonio Intl AP, US | daily rain | 33.0 mm (1.3 in) | 11.4 mm (0.4 in) | 76 years | 35 of 100 (Notable) |
Climate Trend
79 complete years, 1947 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1947 | 20.0 C | -0.87 C |
| 1948 | 20.5 C | -0.36 C |
| 1949 | 20.5 C | -0.37 C |
| 1950 | 20.7 C | -0.10 C |
| 1951 | 20.8 C | -0.01 C |
| 1952 | 20.3 C | -0.54 C |
| 1953 | 21.0 C | +0.14 C |
| 1954 | 21.9 C | +1.04 C |
| 1955 | 21.2 C | +0.35 C |
| 1956 | 21.3 C | +0.44 C |
| 1957 | 20.5 C | -0.30 C |
| 1958 | 19.7 C | -1.18 C |
| 1959 | 20.0 C | -0.83 C |
| 1960 | 19.9 C | -0.89 C |
| 1961 | 20.5 C | -0.36 C |
| 1962 | 21.1 C | +0.31 C |
| 1963 | 20.8 C | +0.01 C |
| 1964 | 20.5 C | -0.35 C |
| 1965 | 20.4 C | -0.48 C |
| 1966 | 19.3 C | -1.57 C |
| 1967 | 20.6 C | -0.28 C |
| 1968 | 19.4 C | -1.48 C |
| 1969 | 20.2 C | -0.67 C |
| 1970 | 20.1 C | -0.78 C |
| 1971 | 21.6 C | +0.77 C |
| 1972 | 20.4 C | -0.42 C |
| 1973 | 20.2 C | -0.66 C |
| 1974 | 19.9 C | -0.91 C |
| 1975 | 19.9 C | -0.97 C |
| 1976 | 19.1 C | -1.74 C |
| 1977 | 20.2 C | -0.67 C |
| 1978 | 19.7 C | -1.16 C |
| 1979 | 20.1 C | -0.72 C |
| 1980 | 21.0 C | +0.16 C |
| 1981 | 20.6 C | -0.20 C |
| 1982 | 20.1 C | -0.69 C |
| 1983 | 19.3 C | -1.58 C |
| 1984 | 20.7 C | -0.13 C |
| 1985 | 20.1 C | -0.75 C |
| 1986 | 21.1 C | +0.22 C |
| 1987 | 20.3 C | -0.58 C |
| 1988 | 20.9 C | +0.06 C |
| 1989 | 20.8 C | -0.05 C |
| 1990 | 21.4 C | +0.56 C |
| 1991 | 21.0 C | +0.12 C |
| 1992 | 20.8 C | -0.02 C |
| 1993 | 20.5 C | -0.30 C |
| 1994 | 21.5 C | +0.71 C |
| 1995 | 20.9 C | +0.05 C |
| 1996 | 21.1 C | +0.23 C |
| 1997 | 19.9 C | -0.92 C |
| 1998 | 21.2 C | +0.41 C |
| 1999 | 21.3 C | +0.47 C |
| 2000 | 21.2 C | +0.40 C |
| 2001 | 20.4 C | -0.41 C |
| 2002 | 20.5 C | -0.31 C |
| 2003 | 20.5 C | -0.32 C |
| 2004 | 20.9 C | +0.05 C |
| 2005 | 21.3 C | +0.44 C |
| 2006 | 22.3 C | +1.44 C |
| 2007 | 20.5 C | -0.38 C |
| 2008 | 21.7 C | +0.91 C |
| 2009 | 21.7 C | +0.86 C |
| 2010 | 20.5 C | -0.38 C |
| 2011 | 22.1 C | +1.29 C |
| 2012 | 22.0 C | +1.20 C |
| 2013 | 21.4 C | +0.58 C |
| 2014 | 21.3 C | +0.48 C |
| 2015 | 21.4 C | +0.59 C |
| 2016 | 21.7 C | +0.88 C |
| 2017 | 22.1 C | +1.23 C |
| 2018 | 21.2 C | +0.36 C |
| 2019 | 21.2 C | +0.40 C |
| 2020 | 22.1 C | +1.26 C |
| 2021 | 21.3 C | +0.48 C |
| 2022 | 21.8 C | +0.95 C |
| 2023 | 22.6 C | +1.73 C |
| 2024 | 22.9 C | +2.08 C |
| 2025 | 22.6 C | +1.72 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1947 to 2025. In Fahrenheit: 0.4 F (0.3 to 0.5) per decade. The slope is a straight line fitted to 79 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.2 C (0.1 to 0.3) per decade | 0.4 F (0.3 to 0.5) per decade | 1947 to 2025 | 79 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.2 to 0.5) per decade | 1947 to 2025 | 79 | Rise |
| Mean daily minimum | 0.2 C (0.2 to 0.3) per decade | 0.4 F (0.3 to 0.5) per decade | 1947 to 2025 | 79 | Rise |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1946 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 43.9 C (111.0 F) | 2000 | 38.9 C (102.0 F) | 81 |
| Coldest night (TNn) | -17.8 C (0.0 F) | 1949 | -6.0 C (21.2 F) | 81 |
| Wettest day (Rx1day) | 286.0 mm (11.3 in) | 1998 | 84.1 mm (3.3 in) | 81 |
| Wettest five days (Rx5day) | 397.8 mm (15.7 in) | 1998 | 131.7 mm (5.2 in) | 81 |
| Longest dry spell (CDD) | 81 days | 2011 | 37 days | 81 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1946 | 34.4 C (93.9 F) |
| 1947 | 40.0 C (104.0 F) |
| 1948 | 39.4 C (102.9 F) |
| 1949 | 38.3 C (100.9 F) |
| 1950 | 37.2 C (99.0 F) |
| 1951 | 40.6 C (105.1 F) |
| 1952 | 38.3 C (100.9 F) |
| 1953 | 41.1 C (106.0 F) |
| 1954 | 41.1 C (106.0 F) |
| 1955 | 38.3 C (100.9 F) |
| 1956 | 39.4 C (102.9 F) |
| 1957 | 38.9 C (102.0 F) |
| 1958 | 37.8 C (100.0 F) |
| 1959 | 38.3 C (100.9 F) |
| 1960 | 40.0 C (104.0 F) |
| 1961 | 37.8 C (100.0 F) |
| 1962 | 41.1 C (106.0 F) |
| 1963 | 37.8 C (100.0 F) |
| 1964 | 40.0 C (104.0 F) |
| 1965 | 37.2 C (99.0 F) |
| 1966 | 37.2 C (99.0 F) |
| 1967 | 38.9 C (102.0 F) |
| 1968 | 37.2 C (99.0 F) |
| 1969 | 40.0 C (104.0 F) |
| 1970 | 37.8 C (100.0 F) |
| 1971 | 37.8 C (100.0 F) |
| 1972 | 36.7 C (98.1 F) |
| 1973 | 36.1 C (97.0 F) |
| 1974 | 37.2 C (99.0 F) |
| 1975 | 35.6 C (96.1 F) |
| 1976 | 35.6 C (96.1 F) |
| 1977 | 37.2 C (99.0 F) |
| 1978 | 38.3 C (100.9 F) |
| 1979 | 36.7 C (98.1 F) |
| 1980 | 40.6 C (105.1 F) |
| 1981 | 37.8 C (100.0 F) |
| 1982 | 38.9 C (102.0 F) |
| 1983 | 38.3 C (100.9 F) |
| 1984 | 38.3 C (100.9 F) |
| 1985 | 39.4 C (102.9 F) |
| 1986 | 42.2 C (108.0 F) |
| 1987 | 37.8 C (100.0 F) |
| 1988 | 38.9 C (102.0 F) |
| 1989 | 41.1 C (106.0 F) |
| 1990 | 38.9 C (102.0 F) |
| 1991 | 39.4 C (102.9 F) |
| 1992 | 37.8 C (100.0 F) |
| 1993 | 38.3 C (100.9 F) |
| 1994 | 40.0 C (104.0 F) |
| 1995 | 39.4 C (102.9 F) |
| 1996 | 39.4 C (102.9 F) |
| 1997 | 38.9 C (102.0 F) |
| 1998 | 41.7 C (107.1 F) |
| 1999 | 40.0 C (104.0 F) |
| 2000 | 43.9 C (111.0 F) |
| 2001 | 38.9 C (102.0 F) |
| 2002 | 37.8 C (100.0 F) |
| 2003 | 39.4 C (102.9 F) |
| 2004 | 40.0 C (104.0 F) |
| 2005 | 40.6 C (105.1 F) |
| 2006 | 38.9 C (102.0 F) |
| 2007 | 36.7 C (98.1 F) |
| 2008 | 38.9 C (102.0 F) |
| 2009 | 40.0 C (104.0 F) |
| 2010 | 39.4 C (102.9 F) |
| 2011 | 43.3 C (109.9 F) |
| 2012 | 41.1 C (106.0 F) |
| 2013 | 42.2 C (108.0 F) |
| 2014 | 38.9 C (102.0 F) |
| 2015 | 40.0 C (104.0 F) |
| 2016 | 38.9 C (102.0 F) |
| 2017 | 40.6 C (105.1 F) |
| 2018 | 40.6 C (105.1 F) |
| 2019 | 39.4 C (102.9 F) |
| 2020 | 41.7 C (107.1 F) |
| 2021 | 37.8 C (100.0 F) |
| 2022 | 41.7 C (107.1 F) |
| 2023 | 41.1 C (106.0 F) |
| 2024 | 42.2 C (108.0 F) |
| 2025 | 39.4 C (102.9 F) |
| 2026 | 39.4 C (102.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1946 | -3.3 C (26.1 F) |
| 1947 | -7.2 C (19.0 F) |
| 1948 | -7.2 C (19.0 F) |
| 1949 | -17.8 C (0.0 F) |
| 1950 | -10.0 C (14.0 F) |
| 1951 | -14.4 C (6.1 F) |
| 1952 | -3.3 C (26.1 F) |
| 1953 | -5.0 C (23.0 F) |
| 1954 | -2.8 C (27.0 F) |
| 1955 | -5.6 C (21.9 F) |
| 1956 | -3.9 C (25.0 F) |
| 1957 | -7.8 C (18.0 F) |
| 1958 | -5.6 C (21.9 F) |
| 1959 | -6.7 C (19.9 F) |
| 1960 | -6.1 C (21.0 F) |
| 1961 | -2.8 C (27.0 F) |
| 1962 | -12.2 C (10.0 F) |
| 1963 | -9.4 C (15.1 F) |
| 1964 | -9.4 C (15.1 F) |
| 1965 | -5.0 C (23.0 F) |
| 1966 | -8.9 C (16.0 F) |
| 1967 | -6.1 C (21.0 F) |
| 1968 | -4.4 C (24.1 F) |
| 1969 | -7.2 C (19.0 F) |
| 1970 | -9.4 C (15.1 F) |
| 1971 | -5.0 C (23.0 F) |
| 1972 | -8.3 C (17.1 F) |
| 1973 | -8.3 C (17.1 F) |
| 1974 | -5.6 C (21.9 F) |
| 1975 | -9.4 C (15.1 F) |
| 1976 | -8.3 C (17.1 F) |
| 1977 | -6.7 C (19.9 F) |
| 1978 | -7.8 C (18.0 F) |
| 1979 | -9.4 C (15.1 F) |
| 1980 | -7.2 C (19.0 F) |
| 1981 | -8.3 C (17.1 F) |
| 1982 | -10.6 C (12.9 F) |
| 1983 | -12.8 C (9.0 F) |
| 1984 | -7.8 C (18.0 F) |
| 1985 | -10.0 C (14.0 F) |
| 1986 | -2.8 C (27.0 F) |
| 1987 | -5.0 C (23.0 F) |
| 1988 | -5.6 C (21.9 F) |
| 1989 | -14.4 C (6.1 F) |
| 1990 | -8.9 C (16.0 F) |
| 1991 | -2.8 C (27.0 F) |
| 1992 | -4.4 C (24.1 F) |
| 1993 | -5.0 C (23.0 F) |
| 1994 | -6.7 C (19.9 F) |
| 1995 | -3.9 C (25.0 F) |
| 1996 | -7.8 C (18.0 F) |
| 1997 | -5.6 C (21.9 F) |
| 1998 | -5.0 C (23.0 F) |
| 1999 | -5.0 C (23.0 F) |
| 2000 | -5.0 C (23.0 F) |
| 2001 | -3.3 C (26.1 F) |
| 2002 | -8.3 C (17.1 F) |
| 2003 | -3.9 C (25.0 F) |
| 2004 | -4.4 C (24.1 F) |
| 2005 | -2.8 C (27.0 F) |
| 2006 | -5.0 C (23.0 F) |
| 2007 | -4.4 C (24.1 F) |
| 2008 | -3.3 C (26.1 F) |
| 2009 | -5.0 C (23.0 F) |
| 2010 | -8.9 C (16.0 F) |
| 2011 | -7.2 C (19.0 F) |
| 2012 | -2.8 C (27.0 F) |
| 2013 | -1.7 C (28.9 F) |
| 2014 | -5.5 C (22.1 F) |
| 2015 | -2.1 C (28.2 F) |
| 2016 | -3.8 C (25.2 F) |
| 2017 | -7.1 C (19.2 F) |
| 2018 | -6.0 C (21.2 F) |
| 2019 | -2.7 C (27.1 F) |
| 2020 | -2.1 C (28.2 F) |
| 2021 | -12.7 C (9.1 F) |
| 2022 | -8.8 C (16.2 F) |
| 2023 | -0.5 C (31.1 F) |
| 2024 | -7.7 C (18.1 F) |
| 2025 | -6.0 C (21.2 F) |
| 2026 | -6.7 C (19.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1946 | 119.6 mm (4.7 in) |
| 1947 | 35.1 mm (1.4 in) |
| 1948 | 112.3 mm (4.4 in) |
| 1949 | 103.9 mm (4.1 in) |
| 1950 | 141.5 mm (5.6 in) |
| 1951 | 157.0 mm (6.2 in) |
| 1952 | 37.8 mm (1.5 in) |
| 1953 | 46.7 mm (1.8 in) |
| 1954 | 44.5 mm (1.8 in) |
| 1955 | 45.2 mm (1.8 in) |
| 1956 | 58.9 mm (2.3 in) |
| 1957 | 120.9 mm (4.8 in) |
| 1958 | 113.0 mm (4.4 in) |
| 1959 | 93.0 mm (3.7 in) |
| 1960 | 125.5 mm (4.9 in) |
| 1961 | 91.9 mm (3.6 in) |
| 1962 | 100.6 mm (4.0 in) |
| 1963 | 62.2 mm (2.4 in) |
| 1964 | 97.3 mm (3.8 in) |
| 1965 | 77.5 mm (3.1 in) |
| 1966 | 49.8 mm (2.0 in) |
| 1967 | 62.2 mm (2.4 in) |
| 1968 | 69.1 mm (2.7 in) |
| 1969 | 70.1 mm (2.8 in) |
| 1970 | 83.1 mm (3.3 in) |
| 1971 | 60.5 mm (2.4 in) |
| 1972 | 135.6 mm (5.3 in) |
| 1973 | 166.1 mm (6.5 in) |
| 1974 | 93.0 mm (3.7 in) |
| 1975 | 54.9 mm (2.2 in) |
| 1976 | 75.9 mm (3.0 in) |
| 1977 | 123.7 mm (4.9 in) |
| 1978 | 130.3 mm (5.1 in) |
| 1979 | 98.3 mm (3.9 in) |
| 1980 | 66.5 mm (2.6 in) |
| 1981 | 115.1 mm (4.5 in) |
| 1982 | 89.4 mm (3.5 in) |
| 1983 | 61.7 mm (2.4 in) |
| 1984 | 38.1 mm (1.5 in) |
| 1985 | 113.0 mm (4.4 in) |
| 1986 | 130.3 mm (5.1 in) |
| 1987 | 89.9 mm (3.5 in) |
| 1988 | 82.3 mm (3.2 in) |
| 1989 | 79.0 mm (3.1 in) |
| 1990 | 103.9 mm (4.1 in) |
| 1991 | 151.6 mm (6.0 in) |
| 1992 | 63.5 mm (2.5 in) |
| 1993 | 159.0 mm (6.3 in) |
| 1994 | 99.1 mm (3.9 in) |
| 1995 | 81.5 mm (3.2 in) |
| 1996 | 45.2 mm (1.8 in) |
| 1997 | 67.6 mm (2.7 in) |
| 1998 | 286.0 mm (11.3 in) |
| 1999 | 39.9 mm (1.6 in) |
| 2000 | 86.1 mm (3.4 in) |
| 2001 | 82.3 mm (3.2 in) |
| 2002 | 241.8 mm (9.5 in) |
| 2003 | 54.6 mm (2.1 in) |
| 2004 | 89.7 mm (3.5 in) |
| 2005 | 39.9 mm (1.6 in) |
| 2006 | 47.5 mm (1.9 in) |
| 2007 | 145.5 mm (5.7 in) |
| 2008 | 46.7 mm (1.8 in) |
| 2009 | 137.7 mm (5.4 in) |
| 2010 | 93.7 mm (3.7 in) |
| 2011 | 77.7 mm (3.1 in) |
| 2012 | 74.7 mm (2.9 in) |
| 2013 | 250.7 mm (9.9 in) |
| 2014 | 76.7 mm (3.0 in) |
| 2015 | 103.4 mm (4.1 in) |
| 2016 | 120.7 mm (4.8 in) |
| 2017 | 84.1 mm (3.3 in) |
| 2018 | 154.2 mm (6.1 in) |
| 2019 | 79.0 mm (3.1 in) |
| 2020 | 52.3 mm (2.1 in) |
| 2021 | 67.1 mm (2.6 in) |
| 2022 | 38.9 mm (1.5 in) |
| 2023 | 58.7 mm (2.3 in) |
| 2024 | 61.2 mm (2.4 in) |
| 2025 | 155.2 mm (6.1 in) |
| 2026 | 112.3 mm (4.4 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1946 | 260.6 mm (10.3 in) |
| 1947 | 74.1 mm (2.9 in) |
| 1948 | 144.1 mm (5.7 in) |
| 1949 | 172.5 mm (6.8 in) |
| 1950 | 143.0 mm (5.6 in) |
| 1951 | 157.3 mm (6.2 in) |
| 1952 | 62.2 mm (2.4 in) |
| 1953 | 80.0 mm (3.1 in) |
| 1954 | 46.6 mm (1.8 in) |
| 1955 | 61.5 mm (2.4 in) |
| 1956 | 58.9 mm (2.3 in) |
| 1957 | 220.0 mm (8.7 in) |
| 1958 | 187.2 mm (7.4 in) |
| 1959 | 96.6 mm (3.8 in) |
| 1960 | 131.7 mm (5.2 in) |
| 1961 | 120.2 mm (4.7 in) |
| 1962 | 110.2 mm (4.3 in) |
| 1963 | 67.6 mm (2.7 in) |
| 1964 | 113.5 mm (4.5 in) |
| 1965 | 134.1 mm (5.3 in) |
| 1966 | 63.8 mm (2.5 in) |
| 1967 | 141.0 mm (5.6 in) |
| 1968 | 183.6 mm (7.2 in) |
| 1969 | 94.0 mm (3.7 in) |
| 1970 | 128.0 mm (5.0 in) |
| 1971 | 144.6 mm (5.7 in) |
| 1972 | 221.2 mm (8.7 in) |
| 1973 | 191.0 mm (7.5 in) |
| 1974 | 187.3 mm (7.4 in) |
| 1975 | 93.4 mm (3.7 in) |
| 1976 | 108.7 mm (4.3 in) |
| 1977 | 151.1 mm (5.9 in) |
| 1978 | 141.9 mm (5.6 in) |
| 1979 | 140.5 mm (5.5 in) |
| 1980 | 106.2 mm (4.2 in) |
| 1981 | 141.8 mm (5.6 in) |
| 1982 | 90.2 mm (3.6 in) |
| 1983 | 86.7 mm (3.4 in) |
| 1984 | 75.1 mm (3.0 in) |
| 1985 | 141.7 mm (5.6 in) |
| 1986 | 196.1 mm (7.7 in) |
| 1987 | 216.6 mm (8.5 in) |
| 1988 | 102.2 mm (4.0 in) |
| 1989 | 96.1 mm (3.8 in) |
| 1990 | 195.9 mm (7.7 in) |
| 1991 | 298.0 mm (11.7 in) |
| 1992 | 107.6 mm (4.2 in) |
| 1993 | 160.8 mm (6.3 in) |
| 1994 | 126.0 mm (5.0 in) |
| 1995 | 107.2 mm (4.2 in) |
| 1996 | 49.8 mm (2.0 in) |
| 1997 | 119.2 mm (4.7 in) |
| 1998 | 397.8 mm (15.7 in) |
| 1999 | 65.1 mm (2.6 in) |
| 2000 | 138.9 mm (5.5 in) |
| 2001 | 213.4 mm (8.4 in) |
| 2002 | 380.3 mm (15.0 in) |
| 2003 | 149.1 mm (5.9 in) |
| 2004 | 121.5 mm (4.8 in) |
| 2005 | 57.1 mm (2.2 in) |
| 2006 | 80.5 mm (3.2 in) |
| 2007 | 147.0 mm (5.8 in) |
| 2008 | 103.8 mm (4.1 in) |
| 2009 | 154.5 mm (6.1 in) |
| 2010 | 165.6 mm (6.5 in) |
| 2011 | 83.3 mm (3.3 in) |
| 2012 | 132.0 mm (5.2 in) |
| 2013 | 311.7 mm (12.3 in) |
| 2014 | 118.6 mm (4.7 in) |
| 2015 | 127.5 mm (5.0 in) |
| 2016 | 167.3 mm (6.6 in) |
| 2017 | 89.4 mm (3.5 in) |
| 2018 | 209.1 mm (8.2 in) |
| 2019 | 83.1 mm (3.3 in) |
| 2020 | 101.1 mm (4.0 in) |
| 2021 | 181.2 mm (7.1 in) |
| 2022 | 46.0 mm (1.8 in) |
| 2023 | 68.1 mm (2.7 in) |
| 2024 | 141.2 mm (5.6 in) |
| 2025 | 186.4 mm (7.3 in) |
| 2026 | 153.5 mm (6.0 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1946 | 23 days |
| 1947 | 38 days |
| 1948 | 30 days |
| 1949 | 18 days |
| 1950 | 47 days |
| 1951 | 43 days |
| 1952 | 51 days |
| 1953 | 54 days |
| 1954 | 73 days |
| 1955 | 30 days |
| 1956 | 42 days |
| 1957 | 26 days |
| 1958 | 31 days |
| 1959 | 32 days |
| 1960 | 31 days |
| 1961 | 48 days |
| 1962 | 54 days |
| 1963 | 49 days |
| 1964 | 50 days |
| 1965 | 23 days |
| 1966 | 51 days |
| 1967 | 32 days |
| 1968 | 30 days |
| 1969 | 29 days |
| 1970 | 56 days |
| 1971 | 37 days |
| 1972 | 32 days |
| 1973 | 24 days |
| 1974 | 47 days |
| 1975 | 51 days |
| 1976 | 32 days |
| 1977 | 44 days |
| 1978 | 50 days |
| 1979 | 41 days |
| 1980 | 34 days |
| 1981 | 39 days |
| 1982 | 27 days |
| 1983 | 28 days |
| 1984 | 42 days |
| 1985 | 32 days |
| 1986 | 29 days |
| 1987 | 33 days |
| 1988 | 37 days |
| 1989 | 29 days |
| 1990 | 33 days |
| 1991 | 34 days |
| 1992 | 47 days |
| 1993 | 73 days |
| 1994 | 30 days |
| 1995 | 36 days |
| 1996 | 59 days |
| 1997 | 42 days |
| 1998 | 60 days |
| 1999 | 66 days |
| 2000 | 34 days |
| 2001 | 48 days |
| 2002 | 26 days |
| 2003 | 32 days |
| 2004 | 25 days |
| 2005 | 43 days |
| 2006 | 46 days |
| 2007 | 45 days |
| 2008 | 54 days |
| 2009 | 21 days |
| 2010 | 51 days |
| 2011 | 81 days |
| 2012 | 38 days |
| 2013 | 30 days |
| 2014 | 24 days |
| 2015 | 41 days |
| 2016 | 52 days |
| 2017 | 27 days |
| 2018 | 27 days |
| 2019 | 31 days |
| 2020 | 34 days |
| 2021 | 21 days |
| 2022 | 45 days |
| 2023 | 29 days |
| 2024 | 58 days |
| 2025 | 46 days |
| 2026 | 33 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
76 years with a frostAcross 76 years with a frost, the median last spring frost at San Antonio Intl AP falls on 4 March and the median first autumn frost on 29 November, which leaves a median of 275 days between them.
In 1993 to 2024 the median growing season was 278 days. That is 13 days more than in 1947 to 1976.
Fitted over all years, the growing season changes by +3.2 days per decade at this station.
| Measure | Median, all years | Earliest period (1947 to 1976) | Recent period (1993 to 2024) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 4 March | 6 March | 27 February | 7 days earlier | -1.8 days per decade |
| First autumn frost | 29 November | 27 November | 1 December | 4 days later | +1.4 days per decade |
| Growing days | 275 days | 265 days | 278 days | 13 days more | +3.2 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
79 years, 1947 to 2025A day with at least 83.3 mm (3.3 in) of rain is expected about once in 2 years. A day with at least 265.7 mm (10.5 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 83.3 mm (3.3 in) | |
| 5 years | 123.3 mm (4.9 in) | |
| 10 years | 153.1 mm (6.0 in) | |
| 25 years | 194.7 mm (7.7 in) | |
| 50 years | 228.8 mm (9.0 in) | |
| 100 years | 265.7 mm (10.5 in) | Longer than the 79 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 79 years of values from 1947 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 286.0 mm (11.3 in) in 1998; 250.7 mm (9.9 in) in 2013; 241.8 mm (9.5 in) in 2002.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, San Antonio Intl AP had a mean temperature of 21.9 C (71.3 F) and 734.5 mm (28.9 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Beeville Chase Naas (United States, 153 km away), Cotulla la Salle Co AP (United States, 140 km away) and Tilden 4 SSE (United States, 126 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Beeville Chase Naas | United States | 153 km (95 mi) | 21.9 C (71.3 F) | 769.3 mm (30.3 in) | 0.71 |
| Cotulla la Salle Co AP | United States | 140 km (87 mi) | 21.7 C (71.0 F) | 620.1 mm (24.4 in) | 0.85 |
| Tilden 4 SSE | United States | 126 km (78 mi) | 21.5 C (70.6 F) | 586.2 mm (23.1 in) | 0.89 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
Download the Data
Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-13 (13 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).