Altoona Blair Co AP Weather Records (USW00014736)
Record envelope, standing records and threshold days for Altoona Blair Co AP (USW00014736), Pennsylvania, United States, with 78 years of record.
Key Facts for Altoona Blair Co AP
- Altoona Blair Co AP (USW00014736) is a weather station in Pennsylvania, United States at 40.30 latitude and -78.32 longitude, 447 m (1,465 ft) above sea level.
- The station reports from 1949 to 2026, 78 years of record.
- 1,464 records set at Altoona Blair Co AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Altoona Blair Co AP set a daily record precipitation of 26.9 mm (1.1 in) on 20 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Pennsylvania, United States, 40.30 latitude, -78.32 longitude.
- Elevation: 447 m (1,465 ft).
- Period of record: 1949 to 2026, 78 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
14 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 23.3 C (73.9 F) | -31.7 C (-25.1 F) | 15.0 C (59.0 F) | -20.0 C (-4.0 F) |
| Feb | 24.4 C (75.9 F) | -23.3 C (-9.9 F) | 16.7 C (62.1 F) | -19.4 C (-2.9 F) |
| Mar | 29.4 C (84.9 F) | -17.2 C (1.0 F) | 28.3 C (82.9 F) | -10.6 C (12.9 F) |
| Apr | 31.7 C (89.1 F) | -11.1 C (12.0 F) | 29.4 C (84.9 F) | -5.6 C (21.9 F) |
| May | 34.4 C (93.9 F) | -3.9 C (25.0 F) | 33.3 C (91.9 F) | -0.6 C (30.9 F) |
| Jun | 36.1 C (97.0 F) | 0.0 C (32.0 F) | 32.8 C (91.0 F) | 6.7 C (44.1 F) |
| Jul | 39.4 C (102.9 F) | 5.0 C (41.0 F) | 33.9 C (93.0 F) | 8.3 C (46.9 F) |
| Aug | 35.6 C (96.1 F) | 2.2 C (36.0 F) | 28.9 C (84.0 F) | 8.9 C (48.0 F) |
| Sep | 36.1 C (97.0 F) | -1.1 C (30.0 F) | 32.2 C (90.0 F) | 2.2 C (36.0 F) |
| Oct | 32.2 C (90.0 F) | -6.7 C (19.9 F) | 28.9 C (84.0 F) | 2.2 C (36.0 F) |
| Nov | 26.1 C (79.0 F) | -13.9 C (7.0 F) | n/a | n/a |
| Dec | 23.3 C (73.9 F) | -23.9 C (-11.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1949 | 20 |
| 1950 | 29 |
| 1951 | 27 |
| 1952 | 26 |
| 1953 | 27 |
| 1954 | 27 |
| 1962 | 8 |
| 1963 | 37 |
| 1964 | 27 |
| 1965 | 26 |
| 1966 | 36 |
| 1967 | 29 |
| 1968 | 24 |
| 1969 | 13 |
| 1970 | 34 |
| 1971 | 28 |
| 1972 | 20 |
| 1973 | 14 |
| 1974 | 26 |
| 1975 | 22 |
| 1976 | 35 |
| 1977 | 31 |
| 1978 | 13 |
| 1979 | 38 |
| 1980 | 22 |
| 1981 | 15 |
| 1982 | 33 |
| 1983 | 29 |
| 1984 | 39 |
| 1985 | 23 |
| 1986 | 21 |
| 1987 | 7 |
| 1988 | 31 |
| 1989 | 27 |
| 1990 | 30 |
| 1991 | 25 |
| 1992 | 11 |
| 1993 | 12 |
| 1994 | 19 |
| 1995 | 10 |
| 1996 | 16 |
| 1997 | 9 |
| 1998 | 34 |
| 1999 | 8 |
| 2000 | 18 |
| 2001 | 17 |
| 2002 | 26 |
| 2003 | 9 |
| 2004 | 7 |
| 2005 | 13 |
| 2006 | 11 |
| 2007 | 12 |
| 2008 | 11 |
| 2009 | 12 |
| 2010 | 9 |
| 2011 | 20 |
| 2012 | 17 |
| 2013 | 15 |
| 2014 | 19 |
| 2015 | 30 |
| 2016 | 11 |
| 2017 | 29 |
| 2018 | 32 |
| 2019 | 11 |
| 2020 | 23 |
| 2021 | 10 |
| 2022 | 11 |
| 2023 | 10 |
| 2024 | 11 |
| 2025 | 17 |
| 2026 | 15 |
All-Time Record Progression
9 new records| Date | Kind | Detail |
|---|---|---|
| 1988-07-07 | Record high maximum temperature | Record high maximum temperature 37.2 C (99.0 F) |
| 1988-07-16 | Record high maximum temperature | Record high maximum temperature 37.8 C (100.0 F) |
| 1992-12-10 | Record daily snowfall | Record daily snowfall 38.4 cm (15.1 in) |
| 1993-03-13 | Record daily snowfall | Record daily snowfall 46.0 cm (18.1 in) |
| 1994-01-19 | Record low minimum temperature | Record low minimum temperature -31.7 C (-25.1 F) |
| 1997-11-07 | Record daily precipitation | Record daily precipitation 127.8 mm (5.0 in) |
| 2004-09-08 | Record daily precipitation | Record daily precipitation 141.0 mm (5.6 in) |
| 2011-07-21 | Record high maximum temperature | Record high maximum temperature 38.3 C (100.9 F) |
| 2011-07-22 | Record high maximum temperature | Record high maximum temperature 39.4 C (102.9 F) |
Wettest Day of Each Month
Sep: 141.0 mm (5.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 49.3 mm (1.9 in) | 19 January 1996 |
| Feb | 59.4 mm (2.3 in) | 14 February 1984 |
| Mar | 57.2 mm (2.3 in) | 5 March 1965 |
| Apr | 65.0 mm (2.6 in) | 16 April 1993 |
| May | 60.2 mm (2.4 in) | 25 May 1997 |
| Jun | 111.5 mm (4.4 in) | 22 June 1972 |
| Jul | 67.6 mm (2.7 in) | 19 July 1996 |
| Aug | 93.7 mm (3.7 in) | 18 August 2021 |
| Sep | 141.0 mm (5.6 in) | 8 September 2004 |
| Oct | 73.7 mm (2.9 in) | 15 October 1954 |
| Nov | 127.8 mm (5.0 in) | 7 November 1997 |
| Dec | 47.2 mm (1.9 in) | 1 December 2010 |
Period of Record Coverage
1949 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1949 | 365 | 100% | Yes |
| 1950 | 354 | 97% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 366 | 100% | Yes |
| 1953 | 364 | 100% | Yes |
| 1954 | 365 | 100% | Yes |
| 1962 | 122 | 33% | No |
| 1963 | 364 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 358 | 98% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 362 | 99% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 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 | 363 | 99% | 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 | 358 | 98% | Yes |
| 2013 | 356 | 98% | Yes |
| 2014 | 364 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 364 | 99% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 285 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 20 September 2026 | Altoona Blair Co AP, US | daily rain (Provisional) | 26.9 mm (1.1 in) | 11.4 mm (0.4 in) | 60 years | 32 of 100 (Routine) |
| 20 September 2026 | Altoona Blair Co AP, US | daily high min (Tie, Provisional) | 17.2 C (63.0 F) | tie | 37 years | 4 of 100 (Routine) |
| 12 September 2026 | Altoona Blair Co AP, US | daily high min (Tie, Provisional) | 19.4 C (66.9 F) | tie | 53 years | 5 of 100 (Routine) |
| 16 August 2026 | Altoona Blair Co AP, US | daily high min (Tie) | 20.6 C (69.1 F) | tie | 56 years | 6 of 100 (Routine) |
| 24 July 2026 | Altoona Blair Co AP, US | daily low min | 8.3 C (46.9 F) | 1.7 C (3.1 F) | 19 years | 17 of 100 (Routine) |
| 23 July 2026 | Altoona Blair Co AP, US | daily low min | 8.3 C (46.9 F) | 1.7 C (3.1 F) | 44 years | 25 of 100 (Routine) |
| 6 July 2026 | Altoona Blair Co AP, US | daily rain | 56.1 mm (2.2 in) | 24.3 mm (1.0 in) | 76 years | 54 of 100 (Notable) |
| 2 July 2026 | Altoona Blair Co AP, US | daily high min | 22.8 C (73.0 F) | 1.1 C (2.0 F) | 27 years | 18 of 100 (Routine) |
| 16 June 2026 | Altoona Blair Co AP, US | daily low min | 6.7 C (44.1 F) | 1.6 C (2.9 F) | 61 years | 29 of 100 (Routine) |
| 23 May 2026 | Altoona Blair Co AP, US | daily low max | 10.0 C (50.0 F) | 1.1 C (2.0 F) | 57 years | 26 of 100 (Routine) |
| 18 May 2026 | Altoona Blair Co AP, US | daily high max | 33.3 C (91.9 F) | 0.5 C (0.9 F) | 29 years | 15 of 100 (Routine) |
| 14 May 2026 | Altoona Blair Co AP, US | daily low max | 9.4 C (48.9 F) | 0.6 C (1.1 F) | 59 years | 25 of 100 (Routine) |
| 3 May 2026 | Altoona Blair Co AP, US | daily low min | -0.6 C (30.9 F) | 0.6 C (1.1 F) | 44 years | 21 of 100 (Routine) |
| 21 April 2026 | Altoona Blair Co AP, US | daily low min | -4.4 C (24.1 F) | 1.1 C (2.0 F) | 44 years | 22 of 100 (Routine) |
| 15 April 2026 | Altoona Blair Co AP, US | daily high max (Tie) | 28.9 C (84.0 F) | tie | 32 years | 4 of 100 (Routine) |
| 4 April 2026 | Altoona Blair Co AP, US | daily high max (Tie) | 26.7 C (80.1 F) | tie | 76 years | 7 of 100 (Routine) |
| 26 March 2026 | Altoona Blair Co AP, US | daily rain | 14.7 mm (0.6 in) | 0.2 mm (0.01 in) | 48 years | 20 of 100 (Routine) |
| 22 March 2026 | Altoona Blair Co AP, US | daily high max | 28.3 C (82.9 F) | 1.1 C (2.0 F) | 60 years | 26 of 100 (Routine) |
| 10 March 2026 | Altoona Blair Co AP, US | daily high max | 25.6 C (78.1 F) | 3.4 C (6.1 F) | 40 years | 23 of 100 (Routine) |
| 7 March 2026 | Altoona Blair Co AP, US | daily high max (Tie) | 22.8 C (73.0 F) | tie | 52 years | 5 of 100 (Routine) |
Climate Trend
69 complete years, 1949 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1949 | 10.6 C | +0.45 C |
| 1950 | 9.2 C | -0.97 C |
| 1951 | 9.7 C | -0.44 C |
| 1952 | 10.2 C | +0.07 C |
| 1953 | 10.9 C | +0.70 C |
| 1954 | 10.0 C | -0.21 C |
| 1963 | 9.4 C | -0.77 C |
| 1964 | 9.5 C | -0.63 C |
| 1965 | 9.6 C | -0.60 C |
| 1966 | 9.0 C | -1.16 C |
| 1967 | 9.4 C | -0.75 C |
| 1968 | 10.3 C | +0.16 C |
| 1969 | 10.0 C | -0.18 C |
| 1970 | 10.8 C | +0.63 C |
| 1971 | 10.5 C | +0.34 C |
| 1972 | 10.2 C | -0.01 C |
| 1973 | 10.9 C | +0.75 C |
| 1974 | 10.2 C | +0.07 C |
| 1975 | 10.5 C | +0.31 C |
| 1976 | 9.3 C | -0.87 C |
| 1977 | 9.9 C | -0.24 C |
| 1978 | 8.3 C | -1.89 C |
| 1979 | 8.8 C | -1.39 C |
| 1980 | 8.4 C | -1.75 C |
| 1981 | 9.1 C | -1.10 C |
| 1982 | 9.1 C | -1.05 C |
| 1983 | 9.6 C | -0.55 C |
| 1984 | 10.3 C | +0.15 C |
| 1985 | 10.5 C | +0.34 C |
| 1986 | 9.9 C | -0.23 C |
| 1987 | 10.4 C | +0.20 C |
| 1988 | 9.8 C | -0.37 C |
| 1989 | 9.2 C | -0.93 C |
| 1990 | 11.2 C | +1.01 C |
| 1991 | 11.4 C | +1.21 C |
| 1992 | 9.4 C | -0.76 C |
| 1993 | 9.6 C | -0.62 C |
| 1994 | 10.4 C | +0.20 C |
| 1995 | 10.3 C | +0.13 C |
| 1996 | 9.5 C | -0.67 C |
| 1997 | 10.0 C | -0.13 C |
| 1998 | 12.3 C | +2.12 C |
| 1999 | 10.6 C | +0.39 C |
| 2000 | 9.5 C | -0.65 C |
| 2001 | 10.1 C | -0.06 C |
| 2002 | 10.5 C | +0.29 C |
| 2003 | 8.9 C | -1.28 C |
| 2004 | 9.5 C | -0.70 C |
| 2005 | 9.7 C | -0.47 C |
| 2006 | 10.6 C | +0.43 C |
| 2007 | 10.0 C | -0.22 C |
| 2008 | 9.7 C | -0.52 C |
| 2009 | 9.4 C | -0.76 C |
| 2010 | 10.4 C | +0.21 C |
| 2011 | 11.2 C | +1.01 C |
| 2012 | 11.8 C | +1.61 C |
| 2013 | 10.2 C | -0.01 C |
| 2014 | 9.2 C | -0.95 C |
| 2015 | 10.5 C | +0.37 C |
| 2016 | 11.1 C | +0.95 C |
| 2017 | 11.3 C | +1.17 C |
| 2018 | 11.1 C | +0.92 C |
| 2019 | 10.8 C | +0.59 C |
| 2020 | 11.5 C | +1.36 C |
| 2021 | 11.5 C | +1.32 C |
| 2022 | 10.6 C | +0.46 C |
| 2023 | 11.6 C | +1.44 C |
| 2024 | 12.1 C | +1.91 C |
| 2025 | 10.5 C | +0.33 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.3) per decade over 1949 to 2025. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 69 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 | 0.3 F (0.1 to 0.5) per decade | 1949 to 2025 | 69 | Rise |
| Mean daily maximum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.1 to 0.5) per decade | 1949 to 2025 | 69 | Rise |
| Mean daily minimum | 0.1 C (0.1 to 0.2) per decade | 0.3 F (0.1 to 0.4) per decade | 1949 to 2025 | 69 | 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
1949 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 39.4 C (102.9 F) | 2011 | 33.9 C (93.0 F) | 71 |
| Coldest night (TNn) | -31.7 C (-25.1 F) | 1994 | -18.9 C (-2.0 F) | 71 |
| Wettest day (Rx1day) | 141.0 mm (5.6 in) | 2004 | 51.6 mm (2.0 in) | 71 |
| Wettest five days (Rx5day) | 234.7 mm (9.2 in) | 1972 | 79.2 mm (3.1 in) | 71 |
| Longest dry spell (CDD) | 34 days | 2024 | 17 days | 71 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1949 | 34.4 C (93.9 F) |
| 1950 | 32.8 C (91.0 F) |
| 1951 | 32.8 C (91.0 F) |
| 1952 | 36.1 C (97.0 F) |
| 1953 | 36.1 C (97.0 F) |
| 1954 | 35.0 C (95.0 F) |
| 1962 | 30.0 C (86.0 F) |
| 1963 | 33.3 C (91.9 F) |
| 1964 | 33.9 C (93.0 F) |
| 1965 | 34.4 C (93.9 F) |
| 1966 | 36.1 C (97.0 F) |
| 1967 | 32.8 C (91.0 F) |
| 1968 | 34.4 C (93.9 F) |
| 1969 | 35.6 C (96.1 F) |
| 1970 | 32.8 C (91.0 F) |
| 1971 | 36.1 C (97.0 F) |
| 1972 | 33.9 C (93.0 F) |
| 1973 | 32.8 C (91.0 F) |
| 1974 | 32.2 C (90.0 F) |
| 1975 | 35.0 C (95.0 F) |
| 1976 | 31.7 C (89.1 F) |
| 1977 | 35.6 C (96.1 F) |
| 1978 | 32.8 C (91.0 F) |
| 1979 | 30.0 C (86.0 F) |
| 1980 | 32.8 C (91.0 F) |
| 1981 | 32.2 C (90.0 F) |
| 1982 | 30.0 C (86.0 F) |
| 1983 | 35.0 C (95.0 F) |
| 1984 | 34.4 C (93.9 F) |
| 1985 | 34.4 C (93.9 F) |
| 1986 | 33.3 C (91.9 F) |
| 1987 | 34.4 C (93.9 F) |
| 1988 | 37.8 C (100.0 F) |
| 1989 | 32.2 C (90.0 F) |
| 1990 | 33.9 C (93.0 F) |
| 1991 | 35.6 C (96.1 F) |
| 1992 | 31.7 C (89.1 F) |
| 1993 | 33.9 C (93.0 F) |
| 1994 | 36.1 C (97.0 F) |
| 1995 | 36.7 C (98.1 F) |
| 1996 | 33.3 C (91.9 F) |
| 1997 | 34.4 C (93.9 F) |
| 1998 | 33.3 C (91.9 F) |
| 1999 | 36.1 C (97.0 F) |
| 2000 | 30.6 C (87.1 F) |
| 2001 | 35.6 C (96.1 F) |
| 2002 | 35.6 C (96.1 F) |
| 2003 | 31.1 C (88.0 F) |
| 2004 | 31.1 C (88.0 F) |
| 2005 | 35.0 C (95.0 F) |
| 2006 | 32.8 C (91.0 F) |
| 2007 | 33.3 C (91.9 F) |
| 2008 | 31.7 C (89.1 F) |
| 2009 | 32.2 C (90.0 F) |
| 2010 | 34.4 C (93.9 F) |
| 2011 | 39.4 C (102.9 F) |
| 2012 | 37.2 C (99.0 F) |
| 2013 | 33.9 C (93.0 F) |
| 2014 | 31.1 C (88.0 F) |
| 2015 | 33.9 C (93.0 F) |
| 2016 | 35.0 C (95.0 F) |
| 2017 | 33.3 C (91.9 F) |
| 2018 | 35.0 C (95.0 F) |
| 2019 | 33.3 C (91.9 F) |
| 2020 | 35.0 C (95.0 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 33.3 C (91.9 F) |
| 2023 | 32.8 C (91.0 F) |
| 2024 | 36.1 C (97.0 F) |
| 2025 | 33.9 C (93.0 F) |
| 2026 | 33.9 C (93.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1949 | -17.2 C (1.0 F) |
| 1950 | -19.4 C (-2.9 F) |
| 1951 | -19.4 C (-2.9 F) |
| 1952 | -15.6 C (3.9 F) |
| 1953 | -12.8 C (9.0 F) |
| 1954 | -17.8 C (0.0 F) |
| 1962 | -17.2 C (1.0 F) |
| 1963 | -24.4 C (-11.9 F) |
| 1964 | -17.2 C (1.0 F) |
| 1965 | -22.2 C (-8.0 F) |
| 1966 | -20.6 C (-5.1 F) |
| 1967 | -18.9 C (-2.0 F) |
| 1968 | -20.6 C (-5.1 F) |
| 1969 | -17.8 C (0.0 F) |
| 1970 | -19.4 C (-2.9 F) |
| 1971 | -18.9 C (-2.0 F) |
| 1972 | -20.6 C (-5.1 F) |
| 1973 | -18.9 C (-2.0 F) |
| 1974 | -13.9 C (7.0 F) |
| 1975 | -20.0 C (-4.0 F) |
| 1976 | -19.4 C (-2.9 F) |
| 1977 | -23.9 C (-11.0 F) |
| 1978 | -17.8 C (0.0 F) |
| 1979 | -23.3 C (-9.9 F) |
| 1980 | -20.0 C (-4.0 F) |
| 1981 | -21.7 C (-7.1 F) |
| 1982 | -28.9 C (-20.0 F) |
| 1983 | -23.9 C (-11.0 F) |
| 1984 | -22.8 C (-9.0 F) |
| 1985 | -28.3 C (-18.9 F) |
| 1986 | -17.8 C (0.0 F) |
| 1987 | -18.3 C (-0.9 F) |
| 1988 | -19.4 C (-2.9 F) |
| 1989 | -21.1 C (-6.0 F) |
| 1990 | -17.2 C (1.0 F) |
| 1991 | -16.1 C (3.0 F) |
| 1992 | -16.1 C (3.0 F) |
| 1993 | -20.0 C (-4.0 F) |
| 1994 | -31.7 C (-25.1 F) |
| 1995 | -17.8 C (0.0 F) |
| 1996 | -22.8 C (-9.0 F) |
| 1997 | -18.3 C (-0.9 F) |
| 1998 | -15.0 C (5.0 F) |
| 1999 | -16.7 C (1.9 F) |
| 2000 | -16.1 C (3.0 F) |
| 2001 | -16.7 C (1.9 F) |
| 2002 | -16.7 C (1.9 F) |
| 2003 | -18.3 C (-0.9 F) |
| 2004 | -20.0 C (-4.0 F) |
| 2005 | -19.4 C (-2.9 F) |
| 2006 | -15.6 C (3.9 F) |
| 2007 | -19.4 C (-2.9 F) |
| 2008 | -16.7 C (1.9 F) |
| 2009 | -23.3 C (-9.9 F) |
| 2010 | -17.8 C (0.0 F) |
| 2011 | -20.6 C (-5.1 F) |
| 2012 | -15.0 C (5.0 F) |
| 2013 | -15.0 C (5.0 F) |
| 2014 | -22.1 C (-7.8 F) |
| 2015 | -22.1 C (-7.8 F) |
| 2016 | -16.6 C (2.1 F) |
| 2017 | -14.9 C (5.2 F) |
| 2018 | -19.9 C (-3.8 F) |
| 2019 | -19.9 C (-3.8 F) |
| 2020 | -13.2 C (8.2 F) |
| 2021 | -16.0 C (3.2 F) |
| 2022 | -19.3 C (-2.7 F) |
| 2023 | -13.8 C (7.2 F) |
| 2024 | -14.3 C (6.3 F) |
| 2025 | -23.8 C (-10.8 F) |
| 2026 | -20.0 C (-4.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1949 | 58.4 mm (2.3 in) |
| 1950 | 90.4 mm (3.6 in) |
| 1951 | 51.3 mm (2.0 in) |
| 1952 | 74.7 mm (2.9 in) |
| 1953 | 39.1 mm (1.5 in) |
| 1954 | 73.7 mm (2.9 in) |
| 1962 | 31.2 mm (1.2 in) |
| 1963 | 50.5 mm (2.0 in) |
| 1964 | 42.7 mm (1.7 in) |
| 1965 | 57.2 mm (2.3 in) |
| 1966 | 49.3 mm (1.9 in) |
| 1967 | 115.1 mm (4.5 in) |
| 1968 | 46.5 mm (1.8 in) |
| 1969 | 42.4 mm (1.7 in) |
| 1970 | 46.7 mm (1.8 in) |
| 1971 | 52.8 mm (2.1 in) |
| 1972 | 111.5 mm (4.4 in) |
| 1973 | 55.4 mm (2.2 in) |
| 1974 | 33.5 mm (1.3 in) |
| 1975 | 73.7 mm (2.9 in) |
| 1976 | 62.7 mm (2.5 in) |
| 1977 | 51.1 mm (2.0 in) |
| 1978 | 31.2 mm (1.2 in) |
| 1979 | 57.4 mm (2.3 in) |
| 1980 | 50.8 mm (2.0 in) |
| 1981 | 50.0 mm (2.0 in) |
| 1982 | 36.3 mm (1.4 in) |
| 1983 | 53.3 mm (2.1 in) |
| 1984 | 59.4 mm (2.3 in) |
| 1985 | 48.3 mm (1.9 in) |
| 1986 | 41.7 mm (1.6 in) |
| 1987 | 53.3 mm (2.1 in) |
| 1988 | 48.5 mm (1.9 in) |
| 1989 | 51.3 mm (2.0 in) |
| 1990 | 52.8 mm (2.1 in) |
| 1991 | 51.1 mm (2.0 in) |
| 1992 | 41.9 mm (1.6 in) |
| 1993 | 65.0 mm (2.6 in) |
| 1994 | 55.6 mm (2.2 in) |
| 1995 | 51.6 mm (2.0 in) |
| 1996 | 74.7 mm (2.9 in) |
| 1997 | 127.8 mm (5.0 in) |
| 1998 | 46.0 mm (1.8 in) |
| 1999 | 45.2 mm (1.8 in) |
| 2000 | 33.5 mm (1.3 in) |
| 2001 | 44.7 mm (1.8 in) |
| 2002 | 61.0 mm (2.4 in) |
| 2003 | 45.0 mm (1.8 in) |
| 2004 | 141.0 mm (5.6 in) |
| 2005 | 41.9 mm (1.6 in) |
| 2006 | 59.7 mm (2.4 in) |
| 2007 | 36.3 mm (1.4 in) |
| 2008 | 35.6 mm (1.4 in) |
| 2009 | 58.7 mm (2.3 in) |
| 2010 | 70.4 mm (2.8 in) |
| 2011 | 65.0 mm (2.6 in) |
| 2012 | 59.9 mm (2.4 in) |
| 2013 | 46.5 mm (1.8 in) |
| 2014 | 48.3 mm (1.9 in) |
| 2015 | 61.5 mm (2.4 in) |
| 2016 | 39.4 mm (1.6 in) |
| 2017 | 55.9 mm (2.2 in) |
| 2018 | 71.9 mm (2.8 in) |
| 2019 | 40.4 mm (1.6 in) |
| 2020 | 54.4 mm (2.1 in) |
| 2021 | 132.3 mm (5.2 in) |
| 2022 | 68.8 mm (2.7 in) |
| 2023 | 43.4 mm (1.7 in) |
| 2024 | 67.1 mm (2.6 in) |
| 2025 | 48.0 mm (1.9 in) |
| 2026 | 56.1 mm (2.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1949 | 72.4 mm (2.9 in) |
| 1950 | 109.2 mm (4.3 in) |
| 1951 | 88.1 mm (3.5 in) |
| 1952 | 145.4 mm (5.7 in) |
| 1953 | 70.6 mm (2.8 in) |
| 1954 | 78.8 mm (3.1 in) |
| 1962 | 61.2 mm (2.4 in) |
| 1963 | 74.1 mm (2.9 in) |
| 1964 | 67.8 mm (2.7 in) |
| 1965 | 61.8 mm (2.4 in) |
| 1966 | 56.5 mm (2.2 in) |
| 1967 | 120.2 mm (4.7 in) |
| 1968 | 60.8 mm (2.4 in) |
| 1969 | 67.3 mm (2.6 in) |
| 1970 | 100.7 mm (4.0 in) |
| 1971 | 89.6 mm (3.5 in) |
| 1972 | 234.7 mm (9.2 in) |
| 1973 | 73.5 mm (2.9 in) |
| 1974 | 66.6 mm (2.6 in) |
| 1975 | 127.6 mm (5.0 in) |
| 1976 | 120.3 mm (4.7 in) |
| 1977 | 70.9 mm (2.8 in) |
| 1978 | 88.3 mm (3.5 in) |
| 1979 | 87.2 mm (3.4 in) |
| 1980 | 52.6 mm (2.1 in) |
| 1981 | 84.8 mm (3.3 in) |
| 1982 | 49.9 mm (2.0 in) |
| 1983 | 95.5 mm (3.8 in) |
| 1984 | 64.8 mm (2.6 in) |
| 1985 | 74.7 mm (2.9 in) |
| 1986 | 58.8 mm (2.3 in) |
| 1987 | 84.0 mm (3.3 in) |
| 1988 | 70.6 mm (2.8 in) |
| 1989 | 107.4 mm (4.2 in) |
| 1990 | 80.9 mm (3.2 in) |
| 1991 | 65.1 mm (2.6 in) |
| 1992 | 79.2 mm (3.1 in) |
| 1993 | 69.3 mm (2.7 in) |
| 1994 | 67.5 mm (2.7 in) |
| 1995 | 94.4 mm (3.7 in) |
| 1996 | 104.4 mm (4.1 in) |
| 1997 | 161.4 mm (6.4 in) |
| 1998 | 59.4 mm (2.3 in) |
| 1999 | 65.0 mm (2.6 in) |
| 2000 | 92.5 mm (3.6 in) |
| 2001 | 49.8 mm (2.0 in) |
| 2002 | 89.2 mm (3.5 in) |
| 2003 | 82.8 mm (3.3 in) |
| 2004 | 167.3 mm (6.6 in) |
| 2005 | 47.0 mm (1.9 in) |
| 2006 | 83.4 mm (3.3 in) |
| 2007 | 104.7 mm (4.1 in) |
| 2008 | 64.6 mm (2.5 in) |
| 2009 | 79.3 mm (3.1 in) |
| 2010 | 95.3 mm (3.8 in) |
| 2011 | 156.4 mm (6.2 in) |
| 2012 | 90.9 mm (3.6 in) |
| 2013 | 78.5 mm (3.1 in) |
| 2014 | 85.8 mm (3.4 in) |
| 2015 | 75.7 mm (3.0 in) |
| 2016 | 65.7 mm (2.6 in) |
| 2017 | 70.6 mm (2.8 in) |
| 2018 | 149.5 mm (5.9 in) |
| 2019 | 72.6 mm (2.9 in) |
| 2020 | 65.8 mm (2.6 in) |
| 2021 | 163.1 mm (6.4 in) |
| 2022 | 86.1 mm (3.4 in) |
| 2023 | 56.1 mm (2.2 in) |
| 2024 | 113.9 mm (4.5 in) |
| 2025 | 76.8 mm (3.0 in) |
| 2026 | 105.4 mm (4.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1949 | 15 days |
| 1950 | 15 days |
| 1951 | 22 days |
| 1952 | 29 days |
| 1953 | 24 days |
| 1954 | 14 days |
| 1962 | 13 days |
| 1963 | 31 days |
| 1964 | 29 days |
| 1965 | 15 days |
| 1966 | 15 days |
| 1967 | 26 days |
| 1968 | 26 days |
| 1969 | 17 days |
| 1970 | 15 days |
| 1971 | 16 days |
| 1972 | 13 days |
| 1973 | 13 days |
| 1974 | 12 days |
| 1975 | 17 days |
| 1976 | 17 days |
| 1977 | 19 days |
| 1978 | 15 days |
| 1979 | 13 days |
| 1980 | 21 days |
| 1981 | 28 days |
| 1982 | 19 days |
| 1983 | 15 days |
| 1984 | 14 days |
| 1985 | 31 days |
| 1986 | 18 days |
| 1987 | 18 days |
| 1988 | 24 days |
| 1989 | 31 days |
| 1990 | 20 days |
| 1991 | 25 days |
| 1992 | 16 days |
| 1993 | 16 days |
| 1994 | 14 days |
| 1995 | 27 days |
| 1996 | 15 days |
| 1997 | 22 days |
| 1998 | 22 days |
| 1999 | 20 days |
| 2000 | 21 days |
| 2001 | 21 days |
| 2002 | 15 days |
| 2003 | 28 days |
| 2004 | 17 days |
| 2005 | 25 days |
| 2006 | 25 days |
| 2007 | 12 days |
| 2008 | 19 days |
| 2009 | 18 days |
| 2010 | 19 days |
| 2011 | 15 days |
| 2012 | 26 days |
| 2013 | 14 days |
| 2014 | 15 days |
| 2015 | 11 days |
| 2016 | 12 days |
| 2017 | 20 days |
| 2018 | 12 days |
| 2019 | 15 days |
| 2020 | 15 days |
| 2021 | 12 days |
| 2022 | 12 days |
| 2023 | 13 days |
| 2024 | 34 days |
| 2025 | 23 days |
| 2026 | 20 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
69 years with a frostAcross 69 years with a frost, the median last spring frost at Altoona Blair Co AP falls on 25 April and the median first autumn frost on 14 October, which leaves a median of 172 days between them.
In 1996 to 2025 the median growing season was 177 days. That is 6 days more than in 1949 to 1986.
Fitted over all years, the growing season changes by +1.8 days per decade at this station.
| Measure | Median, all years | Earliest period (1949 to 1986) | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 25 April | 28 April | 25 April | 3 days earlier | -0.6 days per decade |
| First autumn frost | 14 October | 13 October | 18 October | 5 days later | +1.1 days per decade |
| Growing days | 172 days | 171 days | 177 days | 6 days more | +1.8 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
69 years, 1949 to 2025A day with at least 51.8 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 149.5 mm (5.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 51.8 mm (2.0 in) | |
| 5 years | 68.3 mm (2.7 in) | |
| 10 years | 82.3 mm (3.2 in) | |
| 25 years | 104.5 mm (4.1 in) | |
| 50 years | 125.0 mm (4.9 in) | |
| 100 years | 149.5 mm (5.9 in) | Longer than the 69 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, 69 years of values from 1949 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: 141.0 mm (5.6 in) in 2004; 132.3 mm (5.2 in) in 2021; 127.8 mm (5.0 in) in 1997.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Altoona Blair Co AP, at 1984. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1984 ran 0.3 C (0.6 F) higher than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1984 | +0.3 | +0.6 | possible | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Climate Twins
2011 to 2025 against 1961 to 1990Over 2011 to 2025, Altoona Blair Co AP had a mean temperature of 11.0 C (51.8 F) and 976.7 mm (38.5 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Unionville (United States, 135 km away), Cambridge (United States, 279 km away) and Kearneysville (United States, 108 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Unionville | United States | 135 km (84 mi) | 11.1 C (52.0 F) | 1,015.3 mm (40.0 in) | 0.49 |
| Cambridge | United States | 279 km (173 mi) | 11.0 C (51.8 F) | 1,021.6 mm (40.2 in) | 0.54 |
| Kearneysville | United States | 108 km (67 mi) | 11.1 C (52.0 F) | 971.1 mm (38.2 in) | 0.55 |
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-15).