Alpena Wwtp Weather Records (USW00014814)
Record envelope, standing records and threshold days for Alpena Wwtp (USW00014814), Michigan, United States, with 79 years of record.
Key Facts for Alpena Wwtp
- Alpena Wwtp (USW00014814) is a weather station in Michigan, United States at 45.06 latitude and -83.43 longitude, 180 m (590 ft) above sea level.
- The station reports from 1948 to 2026, 79 years of record.
- 1,464 records set at Alpena Wwtp still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Alpena Wwtp set a daily record precipitation of 48.5 mm (1.9 in) on 28 July 2026.
About the Station
- Location: Michigan, United States, 45.06 latitude, -83.43 longitude.
- Elevation: 180 m (590 ft).
- Period of record: 1948 to 2026, 79 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
4 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 13.3 C (55.9 F) | -29.4 C (-20.9 F) | 10.0 C (50.0 F) | -22.2 C (-8.0 F) |
| Feb | 16.7 C (62.1 F) | -31.1 C (-24.0 F) | 7.8 C (46.0 F) | -20.6 C (-5.1 F) |
| Mar | 23.9 C (75.0 F) | -25.0 C (-13.0 F) | 20.0 C (68.0 F) | -17.2 C (1.0 F) |
| Apr | 31.1 C (88.0 F) | -13.9 C (7.0 F) | 18.3 C (64.9 F) | -8.9 C (16.0 F) |
| May | 34.4 C (93.9 F) | -6.1 C (21.0 F) | 31.7 C (89.1 F) | 0.0 C (32.0 F) |
| Jun | 37.8 C (100.0 F) | 1.1 C (34.0 F) | 28.9 C (84.0 F) | 6.7 C (44.1 F) |
| Jul | 37.8 C (100.0 F) | 0.6 C (33.1 F) | 36.1 C (97.0 F) | 11.1 C (52.0 F) |
| Aug | 37.8 C (100.0 F) | 2.2 C (36.0 F) | 31.7 C (89.1 F) | 11.1 C (52.0 F) |
| Sep | 37.2 C (99.0 F) | -3.9 C (25.0 F) | n/a | n/a |
| Oct | 30.6 C (87.1 F) | -6.7 C (19.9 F) | n/a | n/a |
| Nov | 25.0 C (77.0 F) | -17.2 C (1.0 F) | n/a | n/a |
| Dec | 18.3 C (64.9 F) | -24.4 C (-11.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1948 | 17 |
| 1949 | 23 |
| 1950 | 40 |
| 1951 | 26 |
| 1952 | 12 |
| 1953 | 19 |
| 1954 | 18 |
| 1955 | 19 |
| 1956 | 23 |
| 1957 | 20 |
| 1958 | 17 |
| 1959 | 26 |
| 1960 | 16 |
| 1961 | 12 |
| 1962 | 17 |
| 1963 | 31 |
| 1964 | 35 |
| 1965 | 32 |
| 1966 | 17 |
| 1967 | 27 |
| 1968 | 17 |
| 1969 | 16 |
| 1970 | 11 |
| 1971 | 12 |
| 1972 | 14 |
| 1973 | 16 |
| 1974 | 18 |
| 1975 | 10 |
| 1976 | 29 |
| 1977 | 22 |
| 1978 | 7 |
| 1979 | 18 |
| 1980 | 9 |
| 1981 | 22 |
| 1982 | 23 |
| 1983 | 20 |
| 1984 | 12 |
| 1985 | 13 |
| 1986 | 16 |
| 1987 | 22 |
| 1988 | 27 |
| 1989 | 11 |
| 1990 | 11 |
| 1991 | 24 |
| 1992 | 24 |
| 1993 | 20 |
| 1994 | 35 |
| 1995 | 15 |
| 1996 | 13 |
| 1997 | 11 |
| 1998 | 15 |
| 1999 | 12 |
| 2000 | 32 |
| 2001 | 20 |
| 2002 | 23 |
| 2003 | 10 |
| 2004 | 19 |
| 2005 | 19 |
| 2006 | 11 |
| 2007 | 18 |
| 2008 | 5 |
| 2009 | 11 |
| 2010 | 19 |
| 2011 | 5 |
| 2012 | 23 |
| 2013 | 16 |
| 2014 | 22 |
| 2015 | 40 |
| 2016 | 16 |
| 2017 | 35 |
| 2018 | 21 |
| 2019 | 15 |
| 2020 | 16 |
| 2021 | 20 |
| 2022 | 10 |
| 2023 | 16 |
| 2024 | 12 |
| 2025 | 11 |
| 2026 | 7 |
All-Time Record Progression
18 new records| Date | Kind | Detail |
|---|---|---|
| 1979-01-17 | Record snow depth | Record snow depth 76.2 cm (30.0 in) |
| 1979-02-17 | Record low minimum temperature | Record low minimum temperature -30.0 C (-22.0 F) |
| 1979-02-18 | Record low minimum temperature | Record low minimum temperature -31.1 C (-24.0 F) |
| 1982-01-17 | Record low maximum temperature | Record low maximum temperature -19.4 C (-2.9 F) |
| 1985-02-18 | Record snow depth | Record snow depth 78.7 cm (31.0 in) |
| 1987-07-24 | Record high minimum temperature | Record high minimum temperature 23.9 C (75.0 F) |
| 1991-06-27 | Record high minimum temperature | Record high minimum temperature 25.0 C (77.0 F) |
| 1994-01-15 | Record low maximum temperature | Record low maximum temperature -21.1 C (-6.0 F) |
| 1997-02-04 | Record snow depth | Record snow depth 86.4 cm (34.0 in) |
| 1997-02-07 | Record snow depth | Record snow depth 91.4 cm (36.0 in) |
| 1997-02-11 | Record snow depth | Record snow depth 94.0 cm (37.0 in) |
| 1997-02-16 | Record snow depth | Record snow depth 99.1 cm (39.0 in) |
| 1997-02-22 | Record snow depth | Record snow depth 104.1 cm (41.0 in) |
| 1997-02-27 | Record snow depth | Record snow depth 127.0 cm (50.0 in) |
| 1997-02-28 | Record snow depth | Record snow depth 132.1 cm (52.0 in) |
| 1997-03-02 | Record snow depth | Record snow depth 134.6 cm (53.0 in) |
| 1997-03-11 | Record snow depth | Record snow depth 144.8 cm (57.0 in) |
| 2000-12-18 | Record daily snowfall | Record daily snowfall 43.2 cm (17.0 in) |
Wettest Day of Each Month
Sep: 84.8 mm (3.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 40.6 mm (1.6 in) | 8 January 2008 |
| Feb | 40.1 mm (1.6 in) | 17 February 1998 |
| Mar | 50.8 mm (2.0 in) | 23 March 2022 |
| Apr | 54.6 mm (2.1 in) | 13 April 2026 |
| May | 51.8 mm (2.0 in) | 7 May 1983 |
| Jun | 61.0 mm (2.4 in) | 26 June 1969 |
| Jul | 75.4 mm (3.0 in) | 3 July 2002 |
| Aug | 68.1 mm (2.7 in) | 12 August 2014 |
| Sep | 84.8 mm (3.3 in) | 10 September 1968 |
| Oct | 73.2 mm (2.9 in) | 24 October 2017 |
| Nov | 52.6 mm (2.1 in) | 27 November 1966 |
| Dec | 38.1 mm (1.5 in) | 29 December 2019 |
Period of Record Coverage
1948 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 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 | 363 | 99% | Yes |
| 1960 | 364 | 99% | Yes |
| 1961 | 364 | 100% | Yes |
| 1962 | 363 | 99% | Yes |
| 1963 | 361 | 99% | Yes |
| 1964 | 361 | 99% | Yes |
| 1965 | 331 | 91% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 364 | 100% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 360 | 99% | Yes |
| 1974 | 361 | 99% | Yes |
| 1975 | 364 | 100% | Yes |
| 1976 | 364 | 99% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 364 | 100% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 363 | 99% | Yes |
| 1983 | 363 | 99% | Yes |
| 1984 | 364 | 99% | Yes |
| 1985 | 362 | 99% | Yes |
| 1986 | 355 | 97% | Yes |
| 1987 | 363 | 99% | Yes |
| 1988 | 357 | 98% | Yes |
| 1989 | 265 | 73% | No |
| 1990 | 237 | 65% | No |
| 1991 | 353 | 97% | Yes |
| 1992 | 274 | 75% | No |
| 1993 | 361 | 99% | Yes |
| 1994 | 314 | 86% | No |
| 1995 | 360 | 99% | Yes |
| 1996 | 357 | 98% | Yes |
| 1997 | 323 | 88% | No |
| 1998 | 357 | 98% | Yes |
| 1999 | 363 | 99% | Yes |
| 2000 | 358 | 98% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 361 | 99% | Yes |
| 2003 | 326 | 89% | No |
| 2004 | 366 | 100% | Yes |
| 2005 | 363 | 99% | Yes |
| 2006 | 364 | 100% | Yes |
| 2007 | 361 | 99% | Yes |
| 2008 | 363 | 99% | Yes |
| 2009 | 362 | 99% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 363 | 99% | Yes |
| 2012 | 366 | 100% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 335 | 92% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 365 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 364 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 243 | 67% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 28 July 2026 | Alpena Wwtp, US | daily rain | 48.5 mm (1.9 in) | 25.1 mm (1.0 in) | 40 years | 42 of 100 (Notable) |
| 15 July 2026 | Alpena Wwtp, US | daily high max (Tie) | 36.1 C (97.0 F) | tie | 43 years | 4 of 100 (Routine) |
| 14 July 2026 | Alpena Wwtp, US | daily high min (Tie) | 22.2 C (72.0 F) | tie | 9 years | 2 of 100 (Routine) |
| 4 July 2026 | Alpena Wwtp, US | daily high min (Tie) | 21.1 C (70.0 F) | tie | 27 years | 3 of 100 (Routine) |
| 3 July 2026 | Alpena Wwtp, US | daily high min | 21.1 C (70.0 F) | 1.1 C (2.0 F) | 5 years | 11 of 100 (Routine) |
| 2 July 2026 | Alpena Wwtp, US | daily rain | 18.3 mm (0.7 in) | 1.5 mm (0.06 in) | 52 years | 20 of 100 (Routine) |
| 6 June 2026 | Alpena Wwtp, US | daily rain | 26.4 mm (1.0 in) | 0.7 mm (0.03 in) | 63 years | 25 of 100 (Routine) |
| 27 May 2026 | Alpena Wwtp, US | daily high max | 31.1 C (88.0 F) | 1.1 C (2.0 F) | 37 years | 19 of 100 (Routine) |
| 19 May 2026 | Alpena Wwtp, US | daily rain | 34.3 mm (1.4 in) | 11.4 mm (0.4 in) | 43 years | 33 of 100 (Routine) |
| 18 May 2026 | Alpena Wwtp, US | daily rain | 26.7 mm (1.1 in) | 9.4 mm (0.37 in) | 21 years | 24 of 100 (Routine) |
| 14 April 2026 | Alpena Wwtp, US | daily rain | 45.7 mm (1.8 in) | 12.2 mm (0.5 in) | 12 years | 27 of 100 (Routine) |
| 13 April 2026 | Alpena Wwtp, US | monthly rain | 54.6 mm (2.1 in) | 7.4 mm (0.29 in) | 25 years | 34 of 100 (Routine) |
| 3 April 2026 | Alpena Wwtp, US | daily rain | 33.5 mm (1.3 in) | 5.1 mm (0.20 in) | 1 year | 14 of 100 (Routine) |
| 2 April 2026 | Alpena Wwtp, US | daily low max (Tie) | -0.6 C (30.9 F) | tie | 51 years | 5 of 100 (Routine) |
| 20 March 2026 | Alpena Wwtp, US | daily snowfall | 7.6 cm (3.0 in) | 1.2 cm (0.5 in) | 63 years | 27 of 100 (Routine) |
| 18 March 2026 | Alpena Wwtp, US | daily low max | -7.8 C (18.0 F) | 1.7 C (3.1 F) | 76 years | 32 of 100 (Routine) |
| 16 March 2026 | Alpena Wwtp, US | daily rain | 47.5 mm (1.9 in) | 26.4 mm (1.0 in) | 77 years | 70 of 100 (Major) |
| 16 March 2026 | Alpena Wwtp, US | daily snowfall | 7.6 cm (3.0 in) | 1.8 cm (0.7 in) | 53 years | 26 of 100 (Routine) |
| 14 March 2026 | Alpena Wwtp, US | daily rain | 15.7 mm (0.6 in) | 0.2 mm (0.01 in) | 48 years | 20 of 100 (Routine) |
| 10 March 2026 | Alpena Wwtp, US | daily high max | 20.0 C (68.0 F) | 5.0 C (9.0 F) | 9 years | 18 of 100 (Routine) |
Climate Trend
69 complete years, 1948 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1948 | 6.7 C | -0.25 C |
| 1949 | 7.7 C | +0.72 C |
| 1950 | 5.8 C | -1.19 C |
| 1951 | 6.1 C | -0.88 C |
| 1952 | 7.3 C | +0.35 C |
| 1953 | 7.7 C | +0.75 C |
| 1954 | 6.7 C | -0.22 C |
| 1955 | 7.4 C | +0.45 C |
| 1956 | 6.1 C | -0.82 C |
| 1957 | 6.5 C | -0.48 C |
| 1958 | 6.1 C | -0.81 C |
| 1959 | 6.5 C | -0.50 C |
| 1960 | 6.2 C | -0.75 C |
| 1961 | 6.9 C | -0.08 C |
| 1962 | 6.0 C | -0.94 C |
| 1963 | 5.9 C | -1.06 C |
| 1964 | 6.9 C | -0.02 C |
| 1966 | 6.5 C | -0.46 C |
| 1967 | 5.8 C | -1.13 C |
| 1968 | 6.6 C | -0.31 C |
| 1969 | 6.4 C | -0.58 C |
| 1970 | 6.5 C | -0.42 C |
| 1971 | 6.7 C | -0.29 C |
| 1972 | 5.4 C | -1.53 C |
| 1973 | 7.6 C | +0.68 C |
| 1974 | 6.5 C | -0.46 C |
| 1975 | 7.5 C | +0.56 C |
| 1976 | 6.2 C | -0.80 C |
| 1977 | 6.8 C | -0.13 C |
| 1978 | 6.3 C | -0.63 C |
| 1979 | 5.9 C | -1.07 C |
| 1980 | 6.3 C | -0.66 C |
| 1981 | 7.1 C | +0.11 C |
| 1982 | 6.3 C | -0.63 C |
| 1983 | 7.4 C | +0.40 C |
| 1984 | 7.0 C | +0.01 C |
| 1985 | 6.7 C | -0.23 C |
| 1986 | 7.3 C | +0.39 C |
| 1987 | 8.4 C | +1.40 C |
| 1988 | 7.0 C | +0.08 C |
| 1991 | 7.4 C | +0.42 C |
| 1993 | 5.6 C | -1.33 C |
| 1995 | 6.2 C | -0.77 C |
| 1996 | 5.4 C | -1.57 C |
| 1998 | 8.6 C | +1.69 C |
| 1999 | 7.9 C | +0.96 C |
| 2001 | 8.2 C | +1.26 C |
| 2002 | 7.7 C | +0.71 C |
| 2004 | 6.8 C | -0.20 C |
| 2005 | 7.5 C | +0.52 C |
| 2006 | 8.3 C | +1.34 C |
| 2007 | 7.7 C | +0.72 C |
| 2008 | 6.6 C | -0.33 C |
| 2009 | 6.3 C | -0.66 C |
| 2010 | 8.1 C | +1.19 C |
| 2011 | 7.2 C | +0.20 C |
| 2012 | 8.6 C | +1.63 C |
| 2013 | 6.4 C | -0.57 C |
| 2014 | 5.5 C | -1.42 C |
| 2015 | 7.9 C | +0.98 C |
| 2016 | 8.9 C | +1.95 C |
| 2018 | 6.7 C | -0.28 C |
| 2019 | 5.8 C | -1.18 C |
| 2020 | 7.6 C | +0.64 C |
| 2021 | 8.5 C | +1.51 C |
| 2022 | 7.2 C | +0.21 C |
| 2023 | 8.4 C | +1.45 C |
| 2024 | 9.0 C | +2.06 C |
| 2025 | 7.2 C | +0.24 C |
The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1948 to 2025. In Fahrenheit: 0.3 F (0.1 to 0.4) 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 0.2) per decade | 0.3 F (0.1 to 0.4) per decade | 1948 to 2025 | 69 | Rise |
| Mean daily maximum | 0.1 C (0.1 to 0.2) per decade | 0.2 F (0.1 to 0.4) per decade | 1948 to 2025 | 69 | Rise |
| Mean daily minimum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.2 to 0.5) per decade | 1948 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
1948 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 37.8 C (100.0 F) | 1948 | 34.4 C (93.9 F) | 79 |
| Coldest night (TNn) | -31.1 C (-24.0 F) | 1979 | -22.2 C (-8.0 F) | 79 |
| Wettest day (Rx1day) | 84.8 mm (3.3 in) | 1968 | 45.2 mm (1.8 in) | 79 |
| Wettest five days (Rx5day) | 125.5 mm (4.9 in) | 1968 | 70.9 mm (2.8 in) | 79 |
| Longest dry spell (CDD) | 34 days | 1966 | 18 days | 79 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1948 | 37.8 C (100.0 F) |
| 1949 | 35.0 C (95.0 F) |
| 1950 | 31.7 C (89.1 F) |
| 1951 | 30.6 C (87.1 F) |
| 1952 | 33.3 C (91.9 F) |
| 1953 | 37.2 C (99.0 F) |
| 1954 | 32.2 C (90.0 F) |
| 1955 | 37.2 C (99.0 F) |
| 1956 | 34.4 C (93.9 F) |
| 1957 | 31.1 C (88.0 F) |
| 1958 | 31.7 C (89.1 F) |
| 1959 | 34.4 C (93.9 F) |
| 1960 | 33.3 C (91.9 F) |
| 1961 | 35.0 C (95.0 F) |
| 1962 | 32.8 C (91.0 F) |
| 1963 | 34.4 C (93.9 F) |
| 1964 | 36.1 C (97.0 F) |
| 1965 | 35.6 C (96.1 F) |
| 1966 | 35.0 C (95.0 F) |
| 1967 | 31.1 C (88.0 F) |
| 1968 | 33.3 C (91.9 F) |
| 1969 | 34.4 C (93.9 F) |
| 1970 | 33.3 C (91.9 F) |
| 1971 | 33.3 C (91.9 F) |
| 1972 | 34.4 C (93.9 F) |
| 1973 | 35.0 C (95.0 F) |
| 1974 | 34.4 C (93.9 F) |
| 1975 | 35.6 C (96.1 F) |
| 1976 | 31.7 C (89.1 F) |
| 1977 | 37.2 C (99.0 F) |
| 1978 | 32.8 C (91.0 F) |
| 1979 | 32.2 C (90.0 F) |
| 1980 | 33.3 C (91.9 F) |
| 1981 | 35.0 C (95.0 F) |
| 1982 | 31.7 C (89.1 F) |
| 1983 | 37.2 C (99.0 F) |
| 1984 | 31.7 C (89.1 F) |
| 1985 | 31.7 C (89.1 F) |
| 1986 | 32.8 C (91.0 F) |
| 1987 | 35.0 C (95.0 F) |
| 1988 | 37.8 C (100.0 F) |
| 1989 | 35.0 C (95.0 F) |
| 1990 | 35.6 C (96.1 F) |
| 1991 | 34.4 C (93.9 F) |
| 1992 | 32.8 C (91.0 F) |
| 1993 | 31.7 C (89.1 F) |
| 1994 | 30.6 C (87.1 F) |
| 1995 | 37.8 C (100.0 F) |
| 1996 | 32.2 C (90.0 F) |
| 1997 | 35.0 C (95.0 F) |
| 1998 | 33.9 C (93.0 F) |
| 1999 | 35.0 C (95.0 F) |
| 2000 | 32.2 C (90.0 F) |
| 2001 | 37.8 C (100.0 F) |
| 2002 | 35.6 C (96.1 F) |
| 2003 | 33.3 C (91.9 F) |
| 2004 | 34.4 C (93.9 F) |
| 2005 | 35.6 C (96.1 F) |
| 2006 | 36.7 C (98.1 F) |
| 2007 | 35.0 C (95.0 F) |
| 2008 | 31.1 C (88.0 F) |
| 2009 | 32.2 C (90.0 F) |
| 2010 | 34.4 C (93.9 F) |
| 2011 | 36.1 C (97.0 F) |
| 2012 | 35.6 C (96.1 F) |
| 2013 | 35.6 C (96.1 F) |
| 2014 | 32.2 C (90.0 F) |
| 2015 | 34.4 C (93.9 F) |
| 2016 | 35.0 C (95.0 F) |
| 2017 | 33.3 C (91.9 F) |
| 2018 | 36.1 C (97.0 F) |
| 2019 | 31.7 C (89.1 F) |
| 2020 | 33.3 C (91.9 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 33.9 C (93.0 F) |
| 2023 | 32.2 C (90.0 F) |
| 2024 | 35.6 C (96.1 F) |
| 2025 | 36.7 C (98.1 F) |
| 2026 | 36.1 C (97.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1948 | -25.6 C (-14.1 F) |
| 1949 | -17.8 C (0.0 F) |
| 1950 | -23.9 C (-11.0 F) |
| 1951 | -26.1 C (-15.0 F) |
| 1952 | -20.0 C (-4.0 F) |
| 1953 | -18.3 C (-0.9 F) |
| 1954 | -19.4 C (-2.9 F) |
| 1955 | -21.7 C (-7.1 F) |
| 1956 | -16.7 C (1.9 F) |
| 1957 | -20.6 C (-5.1 F) |
| 1958 | -23.9 C (-11.0 F) |
| 1959 | -26.1 C (-15.0 F) |
| 1960 | -20.0 C (-4.0 F) |
| 1961 | -21.1 C (-6.0 F) |
| 1962 | -25.0 C (-13.0 F) |
| 1963 | -25.0 C (-13.0 F) |
| 1964 | -23.3 C (-9.9 F) |
| 1965 | -22.8 C (-9.0 F) |
| 1966 | -23.9 C (-11.0 F) |
| 1967 | -22.8 C (-9.0 F) |
| 1968 | -23.9 C (-11.0 F) |
| 1969 | -21.7 C (-7.1 F) |
| 1970 | -24.4 C (-11.9 F) |
| 1971 | -23.3 C (-9.9 F) |
| 1972 | -22.8 C (-9.0 F) |
| 1973 | -22.2 C (-8.0 F) |
| 1974 | -24.4 C (-11.9 F) |
| 1975 | -22.2 C (-8.0 F) |
| 1976 | -27.2 C (-17.0 F) |
| 1977 | -22.2 C (-8.0 F) |
| 1978 | -23.3 C (-9.9 F) |
| 1979 | -31.1 C (-24.0 F) |
| 1980 | -23.3 C (-9.9 F) |
| 1981 | -26.7 C (-16.1 F) |
| 1982 | -28.3 C (-18.9 F) |
| 1983 | -20.6 C (-5.1 F) |
| 1984 | -23.3 C (-9.9 F) |
| 1985 | -25.0 C (-13.0 F) |
| 1986 | -23.9 C (-11.0 F) |
| 1987 | -19.4 C (-2.9 F) |
| 1988 | -21.1 C (-6.0 F) |
| 1989 | -21.1 C (-6.0 F) |
| 1990 | -20.0 C (-4.0 F) |
| 1991 | -20.0 C (-4.0 F) |
| 1992 | -18.3 C (-0.9 F) |
| 1993 | -21.7 C (-7.1 F) |
| 1994 | -29.4 C (-20.9 F) |
| 1995 | -22.2 C (-8.0 F) |
| 1996 | -27.8 C (-18.0 F) |
| 1997 | -23.3 C (-9.9 F) |
| 1998 | -18.3 C (-0.9 F) |
| 1999 | -20.0 C (-4.0 F) |
| 2000 | -26.1 C (-15.0 F) |
| 2001 | -18.9 C (-2.0 F) |
| 2002 | -17.8 C (0.0 F) |
| 2003 | -24.4 C (-11.9 F) |
| 2004 | -24.4 C (-11.9 F) |
| 2005 | -21.1 C (-6.0 F) |
| 2006 | -17.2 C (1.0 F) |
| 2007 | -20.0 C (-4.0 F) |
| 2008 | -19.4 C (-2.9 F) |
| 2009 | -22.2 C (-8.0 F) |
| 2010 | -17.2 C (1.0 F) |
| 2011 | -21.7 C (-7.1 F) |
| 2012 | -17.2 C (1.0 F) |
| 2013 | -21.7 C (-7.1 F) |
| 2014 | -25.0 C (-13.0 F) |
| 2015 | -26.7 C (-16.1 F) |
| 2016 | -22.2 C (-8.0 F) |
| 2017 | -20.0 C (-4.0 F) |
| 2018 | -22.2 C (-8.0 F) |
| 2019 | -25.0 C (-13.0 F) |
| 2020 | -16.7 C (1.9 F) |
| 2021 | -17.2 C (1.0 F) |
| 2022 | -21.7 C (-7.1 F) |
| 2023 | -19.4 C (-2.9 F) |
| 2024 | -17.8 C (0.0 F) |
| 2025 | -20.0 C (-4.0 F) |
| 2026 | -22.2 C (-8.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1948 | 21.8 mm (0.9 in) |
| 1949 | 28.2 mm (1.1 in) |
| 1950 | 37.1 mm (1.5 in) |
| 1951 | 39.9 mm (1.6 in) |
| 1952 | 43.2 mm (1.7 in) |
| 1953 | 45.0 mm (1.8 in) |
| 1954 | 51.1 mm (2.0 in) |
| 1955 | 37.1 mm (1.5 in) |
| 1956 | 24.9 mm (1.0 in) |
| 1957 | 31.2 mm (1.2 in) |
| 1958 | 23.6 mm (0.9 in) |
| 1959 | 30.5 mm (1.2 in) |
| 1960 | 65.3 mm (2.6 in) |
| 1961 | 39.4 mm (1.6 in) |
| 1962 | 38.1 mm (1.5 in) |
| 1963 | 48.5 mm (1.9 in) |
| 1964 | 41.4 mm (1.6 in) |
| 1965 | 63.0 mm (2.5 in) |
| 1966 | 52.6 mm (2.1 in) |
| 1967 | 39.6 mm (1.6 in) |
| 1968 | 84.8 mm (3.3 in) |
| 1969 | 61.0 mm (2.4 in) |
| 1970 | 35.8 mm (1.4 in) |
| 1971 | 52.8 mm (2.1 in) |
| 1972 | 41.1 mm (1.6 in) |
| 1973 | 48.3 mm (1.9 in) |
| 1974 | 45.7 mm (1.8 in) |
| 1975 | 45.2 mm (1.8 in) |
| 1976 | 44.7 mm (1.8 in) |
| 1977 | 44.2 mm (1.7 in) |
| 1978 | 46.2 mm (1.8 in) |
| 1979 | 18.5 mm (0.7 in) |
| 1980 | 41.4 mm (1.6 in) |
| 1981 | 38.6 mm (1.5 in) |
| 1982 | 30.2 mm (1.2 in) |
| 1983 | 51.8 mm (2.0 in) |
| 1984 | 33.3 mm (1.3 in) |
| 1985 | 52.1 mm (2.1 in) |
| 1986 | 63.5 mm (2.5 in) |
| 1987 | 48.3 mm (1.9 in) |
| 1988 | 54.4 mm (2.1 in) |
| 1989 | 52.1 mm (2.1 in) |
| 1990 | 58.9 mm (2.3 in) |
| 1991 | 58.7 mm (2.3 in) |
| 1992 | 27.2 mm (1.1 in) |
| 1993 | 56.4 mm (2.2 in) |
| 1994 | 43.9 mm (1.7 in) |
| 1995 | 50.8 mm (2.0 in) |
| 1996 | 41.9 mm (1.6 in) |
| 1997 | 46.5 mm (1.8 in) |
| 1998 | 44.5 mm (1.8 in) |
| 1999 | 43.2 mm (1.7 in) |
| 2000 | 47.2 mm (1.9 in) |
| 2001 | 47.2 mm (1.9 in) |
| 2002 | 75.4 mm (3.0 in) |
| 2003 | 56.4 mm (2.2 in) |
| 2004 | 48.3 mm (1.9 in) |
| 2005 | 35.6 mm (1.4 in) |
| 2006 | 35.6 mm (1.4 in) |
| 2007 | 38.6 mm (1.5 in) |
| 2008 | 66.0 mm (2.6 in) |
| 2009 | 46.2 mm (1.8 in) |
| 2010 | 59.4 mm (2.3 in) |
| 2011 | 62.5 mm (2.5 in) |
| 2012 | 54.1 mm (2.1 in) |
| 2013 | 31.0 mm (1.2 in) |
| 2014 | 68.1 mm (2.7 in) |
| 2015 | 32.0 mm (1.3 in) |
| 2016 | 29.2 mm (1.1 in) |
| 2017 | 73.2 mm (2.9 in) |
| 2018 | 32.5 mm (1.3 in) |
| 2019 | 50.8 mm (2.0 in) |
| 2020 | 68.6 mm (2.7 in) |
| 2021 | 35.6 mm (1.4 in) |
| 2022 | 50.8 mm (2.0 in) |
| 2023 | 36.3 mm (1.4 in) |
| 2024 | 58.4 mm (2.3 in) |
| 2025 | 35.6 mm (1.4 in) |
| 2026 | 54.6 mm (2.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1948 | 45.7 mm (1.8 in) |
| 1949 | 44.3 mm (1.7 in) |
| 1950 | 83.4 mm (3.3 in) |
| 1951 | 72.5 mm (2.9 in) |
| 1952 | 58.9 mm (2.3 in) |
| 1953 | 69.4 mm (2.7 in) |
| 1954 | 67.1 mm (2.6 in) |
| 1955 | 49.1 mm (1.9 in) |
| 1956 | 37.3 mm (1.5 in) |
| 1957 | 56.1 mm (2.2 in) |
| 1958 | 59.5 mm (2.3 in) |
| 1959 | 46.2 mm (1.8 in) |
| 1960 | 66.6 mm (2.6 in) |
| 1961 | 70.9 mm (2.8 in) |
| 1962 | 58.5 mm (2.3 in) |
| 1963 | 83.8 mm (3.3 in) |
| 1964 | 59.6 mm (2.3 in) |
| 1965 | 90.4 mm (3.6 in) |
| 1966 | 103.1 mm (4.1 in) |
| 1967 | 67.3 mm (2.6 in) |
| 1968 | 125.5 mm (4.9 in) |
| 1969 | 94.6 mm (3.7 in) |
| 1970 | 72.8 mm (2.9 in) |
| 1971 | 78.2 mm (3.1 in) |
| 1972 | 60.2 mm (2.4 in) |
| 1973 | 80.4 mm (3.2 in) |
| 1974 | 101.4 mm (4.0 in) |
| 1975 | 71.4 mm (2.8 in) |
| 1976 | 51.6 mm (2.0 in) |
| 1977 | 57.1 mm (2.2 in) |
| 1978 | 89.1 mm (3.5 in) |
| 1979 | 43.6 mm (1.7 in) |
| 1980 | 54.9 mm (2.2 in) |
| 1981 | 43.9 mm (1.7 in) |
| 1982 | 59.5 mm (2.3 in) |
| 1983 | 83.2 mm (3.3 in) |
| 1984 | 73.0 mm (2.9 in) |
| 1985 | 67.6 mm (2.7 in) |
| 1986 | 90.2 mm (3.6 in) |
| 1987 | 60.2 mm (2.4 in) |
| 1988 | 64.0 mm (2.5 in) |
| 1989 | 55.6 mm (2.2 in) |
| 1990 | 63.0 mm (2.5 in) |
| 1991 | 81.3 mm (3.2 in) |
| 1992 | 59.4 mm (2.3 in) |
| 1993 | 112.0 mm (4.4 in) |
| 1994 | 74.6 mm (2.9 in) |
| 1995 | 88.9 mm (3.5 in) |
| 1996 | 105.1 mm (4.1 in) |
| 1997 | 72.7 mm (2.9 in) |
| 1998 | 83.1 mm (3.3 in) |
| 1999 | 56.9 mm (2.2 in) |
| 2000 | 61.7 mm (2.4 in) |
| 2001 | 94.5 mm (3.7 in) |
| 2002 | 75.4 mm (3.0 in) |
| 2003 | 60.5 mm (2.4 in) |
| 2004 | 71.7 mm (2.8 in) |
| 2005 | 72.0 mm (2.8 in) |
| 2006 | 62.5 mm (2.5 in) |
| 2007 | 49.3 mm (1.9 in) |
| 2008 | 87.7 mm (3.5 in) |
| 2009 | 73.4 mm (2.9 in) |
| 2010 | 66.5 mm (2.6 in) |
| 2011 | 94.3 mm (3.7 in) |
| 2012 | 77.5 mm (3.1 in) |
| 2013 | 56.2 mm (2.2 in) |
| 2014 | 92.8 mm (3.7 in) |
| 2015 | 47.5 mm (1.9 in) |
| 2016 | 44.5 mm (1.8 in) |
| 2017 | 85.2 mm (3.4 in) |
| 2018 | 89.3 mm (3.5 in) |
| 2019 | 52.1 mm (2.1 in) |
| 2020 | 74.2 mm (2.9 in) |
| 2021 | 65.6 mm (2.6 in) |
| 2022 | 73.3 mm (2.9 in) |
| 2023 | 64.8 mm (2.6 in) |
| 2024 | 117.8 mm (4.6 in) |
| 2025 | 74.7 mm (2.9 in) |
| 2026 | 114.0 mm (4.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1948 | 28 days |
| 1949 | 15 days |
| 1950 | 12 days |
| 1951 | 12 days |
| 1952 | 26 days |
| 1953 | 17 days |
| 1954 | 26 days |
| 1955 | 30 days |
| 1956 | 16 days |
| 1957 | 18 days |
| 1958 | 30 days |
| 1959 | 16 days |
| 1960 | 14 days |
| 1961 | 23 days |
| 1962 | 19 days |
| 1963 | 21 days |
| 1964 | 18 days |
| 1965 | 11 days |
| 1966 | 34 days |
| 1967 | 18 days |
| 1968 | 19 days |
| 1969 | 13 days |
| 1970 | 21 days |
| 1971 | 22 days |
| 1972 | 14 days |
| 1973 | 16 days |
| 1974 | 13 days |
| 1975 | 16 days |
| 1976 | 17 days |
| 1977 | 18 days |
| 1978 | 24 days |
| 1979 | 12 days |
| 1980 | 14 days |
| 1981 | 25 days |
| 1982 | 23 days |
| 1983 | 18 days |
| 1984 | 13 days |
| 1985 | 14 days |
| 1986 | 22 days |
| 1987 | 23 days |
| 1988 | 20 days |
| 1989 | 34 days |
| 1990 | 21 days |
| 1991 | 21 days |
| 1992 | 21 days |
| 1993 | 21 days |
| 1994 | 16 days |
| 1995 | 15 days |
| 1996 | 19 days |
| 1997 | 22 days |
| 1998 | 22 days |
| 1999 | 28 days |
| 2000 | 15 days |
| 2001 | 23 days |
| 2002 | 23 days |
| 2003 | 16 days |
| 2004 | 14 days |
| 2005 | 29 days |
| 2006 | 19 days |
| 2007 | 22 days |
| 2008 | 9 days |
| 2009 | 21 days |
| 2010 | 22 days |
| 2011 | 16 days |
| 2012 | 17 days |
| 2013 | 18 days |
| 2014 | 12 days |
| 2015 | 19 days |
| 2016 | 15 days |
| 2017 | 15 days |
| 2018 | 18 days |
| 2019 | 20 days |
| 2020 | 16 days |
| 2021 | 17 days |
| 2022 | 14 days |
| 2023 | 27 days |
| 2024 | 16 days |
| 2025 | 14 days |
| 2026 | 11 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 Alpena Wwtp falls on 2 May and the median first autumn frost on 16 October, which leaves a median of 165 days between them.
In 1988 to 2025 the median growing season was 171 days. That is 10 days more than in 1948 to 1978.
Fitted over all years, the growing season changes by +2.7 days per decade at this station.
| Measure | Median, all years | Earliest period (1948 to 1978) | Recent period (1988 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 2 May | 8 May | 29 April | 9 days earlier | -1.2 days per decade |
| First autumn frost | 16 October | 15 October | 18 October | 3 days later | +1.5 days per decade |
| Growing days | 165 days | 161 days | 171 days | 10 days more | +2.7 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
73 years, 1948 to 2025A day with at least 44.7 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 81.7 mm (3.2 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 44.7 mm (1.8 in) | |
| 5 years | 56.8 mm (2.2 in) | |
| 10 years | 63.8 mm (2.5 in) | |
| 25 years | 71.7 mm (2.8 in) | |
| 50 years | 77.0 mm (3.0 in) | |
| 100 years | 81.7 mm (3.2 in) | Longer than the 73 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, 73 years of values from 1948 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: 84.8 mm (3.3 in) in 1968; 75.4 mm (3.0 in) in 2002; 73.2 mm (2.9 in) in 2017.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
Climate Twins
2010 to 2025 against 1961 to 1990Over 2010 to 2025, Alpena Wwtp had a mean temperature of 7.5 C (45.5 F) and 805.6 mm (31.7 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Toronto Ellesmere (Canada, 360 km away), Harbor Beach 1 SSE (United States, 150 km away) and Hamilton A (Canada, 350 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Toronto Ellesmere | Canada | 360 km (224 mi) | 7.5 C (45.6 F) | 738.5 mm (29.1 in) | 0.75 |
| Harbor Beach 1 SSE | United States | 150 km (93 mi) | 7.5 C (45.4 F) | 884.4 mm (34.8 in) | 0.82 |
| Hamilton A | Canada | 350 km (217 mi) | 7.4 C (45.4 F) | 888.9 mm (35.0 in) | 0.84 |
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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-12).