Portland Jetport Weather Records (USW00014764)
Record envelope, standing records and threshold days for Portland Jetport (USW00014764), Maine, United States, with 87 years of record.
Key Facts for Portland Jetport
- Portland Jetport (USW00014764) is a weather station in Maine, United States at 43.64 latitude and -70.30 longitude, 13 m (44 ft) above sea level.
- The station reports from 1940 to 2026, 87 years of record.
- 1,464 records set at Portland Jetport still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Portland Jetport set a daily record precipitation of 47.8 mm (1.9 in) on 27 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Maine, United States, 43.64 latitude, -70.30 longitude.
- Elevation: 13 m (44 ft).
- Period of record: 1940 to 2026, 87 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 | 19.4 C (66.9 F) | -32.2 C (-26.0 F) | 8.9 C (48.0 F) | -21.7 C (-7.1 F) |
| Feb | 20.0 C (68.0 F) | -39.4 C (-38.9 F) | 6.1 C (43.0 F) | -16.7 C (1.9 F) |
| Mar | 31.1 C (88.0 F) | -29.4 C (-20.9 F) | 20.6 C (69.1 F) | -15.6 C (3.9 F) |
| Apr | 33.3 C (91.9 F) | -13.3 C (8.1 F) | 20.0 C (68.0 F) | -5.6 C (21.9 F) |
| May | 34.4 C (93.9 F) | -5.0 C (23.0 F) | 33.3 C (91.9 F) | 2.2 C (36.0 F) |
| Jun | 37.2 C (99.0 F) | 0.6 C (33.1 F) | 30.0 C (86.0 F) | 5.0 C (41.0 F) |
| Jul | 37.8 C (100.0 F) | 4.4 C (39.9 F) | 35.6 C (96.1 F) | 9.4 C (48.9 F) |
| Aug | 39.4 C (102.9 F) | 0.6 C (33.1 F) | 33.3 C (91.9 F) | 11.7 C (53.1 F) |
| Sep | 35.0 C (95.0 F) | -5.0 C (23.0 F) | 29.4 C (84.9 F) | 4.4 C (39.9 F) |
| Oct | 31.1 C (88.0 F) | -9.4 C (15.1 F) | 28.3 C (82.9 F) | 0.6 C (33.1 F) |
| Nov | 26.1 C (79.0 F) | -16.1 C (3.0 F) | n/a | n/a |
| Dec | 21.7 C (71.1 F) | -29.4 C (-20.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1940 | 10 |
| 1941 | 20 |
| 1942 | 18 |
| 1943 | 23 |
| 1944 | 13 |
| 1945 | 25 |
| 1946 | 25 |
| 1947 | 30 |
| 1948 | 29 |
| 1949 | 27 |
| 1950 | 34 |
| 1951 | 25 |
| 1952 | 9 |
| 1953 | 34 |
| 1954 | 21 |
| 1955 | 21 |
| 1956 | 35 |
| 1957 | 32 |
| 1958 | 25 |
| 1959 | 17 |
| 1960 | 10 |
| 1961 | 13 |
| 1962 | 24 |
| 1963 | 26 |
| 1964 | 23 |
| 1965 | 20 |
| 1966 | 19 |
| 1967 | 22 |
| 1968 | 17 |
| 1969 | 19 |
| 1970 | 15 |
| 1971 | 16 |
| 1972 | 13 |
| 1973 | 12 |
| 1974 | 24 |
| 1975 | 15 |
| 1976 | 26 |
| 1977 | 19 |
| 1978 | 8 |
| 1979 | 26 |
| 1980 | 11 |
| 1981 | 11 |
| 1982 | 16 |
| 1983 | 9 |
| 1984 | 14 |
| 1985 | 8 |
| 1986 | 8 |
| 1987 | 19 |
| 1988 | 22 |
| 1989 | 18 |
| 1990 | 20 |
| 1991 | 18 |
| 1992 | 15 |
| 1993 | 15 |
| 1994 | 9 |
| 1995 | 20 |
| 1996 | 12 |
| 1997 | 7 |
| 1998 | 11 |
| 1999 | 11 |
| 2000 | 9 |
| 2001 | 13 |
| 2002 | 15 |
| 2003 | 9 |
| 2004 | 4 |
| 2005 | 8 |
| 2006 | 14 |
| 2007 | 23 |
| 2008 | 10 |
| 2009 | 19 |
| 2010 | 13 |
| 2011 | 11 |
| 2012 | 18 |
| 2013 | 11 |
| 2014 | 10 |
| 2015 | 10 |
| 2016 | 13 |
| 2017 | 19 |
| 2018 | 18 |
| 2019 | 10 |
| 2020 | 21 |
| 2021 | 12 |
| 2022 | 12 |
| 2023 | 13 |
| 2024 | 15 |
| 2025 | 10 |
| 2026 | 10 |
All-Time Record Progression
5 new records| Date | Kind | Detail |
|---|---|---|
| 1975-08-02 | Record high maximum temperature | Record high maximum temperature 39.4 C (102.9 F) |
| 1991-08-19 | Record daily precipitation | Record daily precipitation 196.9 mm (7.8 in) |
| 1996-10-21 | Record daily precipitation | Record daily precipitation 298.2 mm (11.7 in) |
| 2011-07-22 | Record high minimum temperature | Record high minimum temperature 24.4 C (75.9 F) |
| 2020-07-27 | Record high minimum temperature | Record high minimum temperature 25.6 C (78.1 F) |
Wettest Day of Each Month
Oct: 298.2 mm (11.7 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 90.4 mm (3.6 in) | 10 January 1977 |
| Feb | 97.3 mm (3.8 in) | 25 February 2010 |
| Mar | 88.1 mm (3.5 in) | 31 March 1951 |
| Apr | 132.3 mm (5.2 in) | 2 April 1973 |
| May | 86.6 mm (3.4 in) | 2 May 2006 |
| Jun | 102.4 mm (4.0 in) | 20 June 1967 |
| Jul | 85.6 mm (3.4 in) | 13 July 1996 |
| Aug | 196.9 mm (7.8 in) | 19 August 1991 |
| Sep | 190.2 mm (7.5 in) | 11 September 1954 |
| Oct | 298.2 mm (11.7 in) | 21 October 1996 |
| Nov | 127.8 mm (5.0 in) | 14 November 2009 |
| Dec | 88.9 mm (3.5 in) | 4 December 1990 |
Period of Record Coverage
1940 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1940 | 55 | 15% | No |
| 1941 | 365 | 100% | Yes |
| 1942 | 365 | 100% | Yes |
| 1943 | 365 | 100% | Yes |
| 1944 | 366 | 100% | Yes |
| 1945 | 365 | 100% | Yes |
| 1946 | 365 | 100% | Yes |
| 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 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 364 | 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 | 284 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 27 September 2026 | Portland Jetport, US | daily rain (Provisional) | 47.8 mm (1.9 in) | 9.4 mm (0.37 in) | 32 years | 22 of 100 (Routine) |
| 14 July 2026 | Portland Jetport, US | daily high min | 21.7 C (71.1 F) | 1.7 C (3.1 F) | 31 years | 22 of 100 (Routine) |
| 3 July 2026 | Portland Jetport, US | daily high min | 22.2 C (72.0 F) | 0.5 C (0.9 F) | 24 years | 16 of 100 (Routine) |
| 2 July 2026 | Portland Jetport, US | daily high min | 22.8 C (73.0 F) | 1.7 C (3.1 F) | 24 years | 20 of 100 (Routine) |
| 11 June 2026 | Portland Jetport, US | daily rain | 37.6 mm (1.5 in) | 12.5 mm (0.5 in) | 12 years | 21 of 100 (Routine) |
| 30 May 2026 | Portland Jetport, US | daily rain | 26.7 mm (1.1 in) | 0.5 mm (0.02 in) | 43 years | 20 of 100 (Routine) |
| 20 May 2026 | Portland Jetport, US | daily high max | 31.7 C (89.1 F) | 1.7 C (3.1 F) | 67 years | 31 of 100 (Routine) |
| 20 May 2026 | Portland Jetport, US | daily high min | 16.7 C (62.1 F) | 1.1 C (2.0 F) | 44 years | 23 of 100 (Routine) |
| 19 May 2026 | Portland Jetport, US | daily high max | 33.3 C (91.9 F) | 3.3 C (5.9 F) | 76 years | 37 of 100 (Notable) |
| 17 May 2026 | Portland Jetport, US | daily high min | 16.1 C (61.0 F) | 3.9 C (7.0 F) | 48 years | 32 of 100 (Routine) |
| 14 May 2026 | Portland Jetport, US | daily rain | 50.3 mm (2.0 in) | 32.0 mm (1.3 in) | 8 years | 40 of 100 (Notable) |
| 21 April 2026 | Portland Jetport, US | daily low min | -5.6 C (21.9 F) | 0.6 C (1.1 F) | 64 years | 28 of 100 (Routine) |
| 14 April 2026 | Portland Jetport, US | daily high min (Tie) | 8.3 C (46.9 F) | tie | 3 years | 2 of 100 (Routine) |
| 16 March 2026 | Portland Jetport, US | daily rain | 38.9 mm (1.5 in) | 4.1 mm (0.16 in) | 72 years | 32 of 100 (Routine) |
| 10 March 2026 | Portland Jetport, US | daily high max | 19.4 C (66.9 F) | 0.5 C (0.9 F) | 9 years | 10 of 100 (Routine) |
| 26 January 2026 | Portland Jetport, US | daily snowfall | 11.7 cm (4.6 in) | 1.3 cm (0.5 in) | 60 years | 27 of 100 (Routine) |
| 25 January 2026 | Portland Jetport, US | daily low max | -13.9 C (7.0 F) | 1.7 C (3.1 F) | 80 years | 35 of 100 (Notable) |
| 25 January 2026 | Portland Jetport, US | daily snowfall | 24.1 cm (9.5 in) | 5.0 cm (2.0 in) | 26 years | 21 of 100 (Routine) |
| 29 December 2025 | Portland Jetport, US | daily rain | 45.7 mm (1.8 in) | 0.5 mm (0.02 in) | 59 years | 25 of 100 (Routine) |
| 5 December 2025 | Portland Jetport, US | daily low min | -16.7 C (1.9 F) | 2.8 C (5.0 F) | 80 years | 36 of 100 (Notable) |
Climate Trend
85 complete years, 1941 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1941 | 7.3 C | -0.45 C |
| 1942 | 7.3 C | -0.51 C |
| 1943 | 6.5 C | -1.27 C |
| 1944 | 7.1 C | -0.72 C |
| 1945 | 6.9 C | -0.85 C |
| 1946 | 7.3 C | -0.52 C |
| 1947 | 7.4 C | -0.35 C |
| 1948 | 7.0 C | -0.78 C |
| 1949 | 8.4 C | +0.60 C |
| 1950 | 7.0 C | -0.77 C |
| 1951 | 7.7 C | -0.12 C |
| 1952 | 7.9 C | +0.09 C |
| 1953 | 8.5 C | +0.69 C |
| 1954 | 7.1 C | -0.67 C |
| 1955 | 7.3 C | -0.52 C |
| 1956 | 6.6 C | -1.19 C |
| 1957 | 7.7 C | -0.05 C |
| 1958 | 6.7 C | -1.09 C |
| 1959 | 7.4 C | -0.40 C |
| 1960 | 7.3 C | -0.53 C |
| 1961 | 7.1 C | -0.67 C |
| 1962 | 6.3 C | -1.51 C |
| 1963 | 6.7 C | -1.14 C |
| 1964 | 6.8 C | -1.03 C |
| 1965 | 7.0 C | -0.75 C |
| 1966 | 7.0 C | -0.77 C |
| 1967 | 6.6 C | -1.20 C |
| 1968 | 7.1 C | -0.68 C |
| 1969 | 8.0 C | +0.22 C |
| 1970 | 7.7 C | -0.14 C |
| 1971 | 7.2 C | -0.64 C |
| 1972 | 6.3 C | -1.47 C |
| 1973 | 8.4 C | +0.60 C |
| 1974 | 7.6 C | -0.23 C |
| 1975 | 7.7 C | -0.14 C |
| 1976 | 6.6 C | -1.21 C |
| 1977 | 6.9 C | -0.88 C |
| 1978 | 6.8 C | -1.04 C |
| 1979 | 7.5 C | -0.30 C |
| 1980 | 7.2 C | -0.58 C |
| 1981 | 7.9 C | +0.08 C |
| 1982 | 7.2 C | -0.60 C |
| 1983 | 8.2 C | +0.43 C |
| 1984 | 8.0 C | +0.19 C |
| 1985 | 7.6 C | -0.16 C |
| 1986 | 7.6 C | -0.23 C |
| 1987 | 7.7 C | -0.07 C |
| 1988 | 8.1 C | +0.28 C |
| 1989 | 7.3 C | -0.48 C |
| 1990 | 8.9 C | +1.14 C |
| 1991 | 8.8 C | +1.05 C |
| 1992 | 7.3 C | -0.46 C |
| 1993 | 7.5 C | -0.27 C |
| 1994 | 7.7 C | -0.12 C |
| 1995 | 7.6 C | -0.24 C |
| 1996 | 7.4 C | -0.41 C |
| 1997 | 7.5 C | -0.29 C |
| 1998 | 9.1 C | +1.26 C |
| 1999 | 8.9 C | +1.06 C |
| 2000 | 7.9 C | +0.08 C |
| 2001 | 8.3 C | +0.53 C |
| 2002 | 8.4 C | +0.64 C |
| 2003 | 7.3 C | -0.48 C |
| 2004 | 7.5 C | -0.26 C |
| 2005 | 7.9 C | +0.14 C |
| 2006 | 9.2 C | +1.38 C |
| 2007 | 7.8 C | +0.01 C |
| 2008 | 8.2 C | +0.42 C |
| 2009 | 7.8 C | +0.04 C |
| 2010 | 9.6 C | +1.76 C |
| 2011 | 8.8 C | +0.97 C |
| 2012 | 9.5 C | +1.75 C |
| 2013 | 8.3 C | +0.51 C |
| 2014 | 8.0 C | +0.21 C |
| 2015 | 8.4 C | +0.61 C |
| 2016 | 9.2 C | +1.38 C |
| 2017 | 8.7 C | +0.89 C |
| 2018 | 8.6 C | +0.84 C |
| 2019 | 8.3 C | +0.53 C |
| 2020 | 9.7 C | +1.91 C |
| 2021 | 9.4 C | +1.59 C |
| 2022 | 9.0 C | +1.22 C |
| 2023 | 9.3 C | +1.55 C |
| 2024 | 9.5 C | +1.72 C |
| 2025 | 8.3 C | +0.46 C |
The annual mean temperature here has risen by 0.2 C (0.2 to 0.3) per decade over 1941 to 2025. In Fahrenheit: 0.4 F (0.3 to 0.5) per decade. The slope is a straight line fitted to 85 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 (0.2 to 0.3) per decade | 0.4 F (0.3 to 0.5) per decade | 1941 to 2025 | 85 | Rise |
| Mean daily maximum | 0.1 C (0.1 to 0.2) per decade | 0.2 F (0.1 to 0.3) per decade | 1941 to 2025 | 85 | Rise |
| Mean daily minimum | 0.4 C (0.3 to 0.4) per decade | 0.6 F (0.5 to 0.8) per decade | 1941 to 2025 | 85 | 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
1940 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 39.4 C (102.9 F) | 1975 | 34.4 C (93.9 F) | 87 |
| Coldest night (TNn) | -39.4 C (-38.9 F) | 1943 | -25.0 C (-13.0 F) | 87 |
| Wettest day (Rx1day) | 298.2 mm (11.7 in) | 1996 | 69.1 mm (2.7 in) | 87 |
| Wettest five days (Rx5day) | 375.7 mm (14.8 in) | 1996 | 97.8 mm (3.9 in) | 87 |
| Longest dry spell (CDD) | 28 days | 1947 | 16 days | 87 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1940 | 16.7 C (62.1 F) |
| 1941 | 36.7 C (98.1 F) |
| 1942 | 33.3 C (91.9 F) |
| 1943 | 34.4 C (93.9 F) |
| 1944 | 37.2 C (99.0 F) |
| 1945 | 35.0 C (95.0 F) |
| 1946 | 35.0 C (95.0 F) |
| 1947 | 37.2 C (99.0 F) |
| 1948 | 37.8 C (100.0 F) |
| 1949 | 36.7 C (98.1 F) |
| 1950 | 33.3 C (91.9 F) |
| 1951 | 32.8 C (91.0 F) |
| 1952 | 34.4 C (93.9 F) |
| 1953 | 35.6 C (96.1 F) |
| 1954 | 32.8 C (91.0 F) |
| 1955 | 36.1 C (97.0 F) |
| 1956 | 34.4 C (93.9 F) |
| 1957 | 33.9 C (93.0 F) |
| 1958 | 33.3 C (91.9 F) |
| 1959 | 35.0 C (95.0 F) |
| 1960 | 33.9 C (93.0 F) |
| 1961 | 32.8 C (91.0 F) |
| 1962 | 31.1 C (88.0 F) |
| 1963 | 34.4 C (93.9 F) |
| 1964 | 33.9 C (93.0 F) |
| 1965 | 34.4 C (93.9 F) |
| 1966 | 33.9 C (93.0 F) |
| 1967 | 33.3 C (91.9 F) |
| 1968 | 35.6 C (96.1 F) |
| 1969 | 33.9 C (93.0 F) |
| 1970 | 33.9 C (93.0 F) |
| 1971 | 35.6 C (96.1 F) |
| 1972 | 30.6 C (87.1 F) |
| 1973 | 33.9 C (93.0 F) |
| 1974 | 31.1 C (88.0 F) |
| 1975 | 39.4 C (102.9 F) |
| 1976 | 33.9 C (93.0 F) |
| 1977 | 37.2 C (99.0 F) |
| 1978 | 35.6 C (96.1 F) |
| 1979 | 33.3 C (91.9 F) |
| 1980 | 33.9 C (93.0 F) |
| 1981 | 33.9 C (93.0 F) |
| 1982 | 35.0 C (95.0 F) |
| 1983 | 35.0 C (95.0 F) |
| 1984 | 35.0 C (95.0 F) |
| 1985 | 32.8 C (91.0 F) |
| 1986 | 31.1 C (88.0 F) |
| 1987 | 36.1 C (97.0 F) |
| 1988 | 36.1 C (97.0 F) |
| 1989 | 35.0 C (95.0 F) |
| 1990 | 33.3 C (91.9 F) |
| 1991 | 36.7 C (98.1 F) |
| 1992 | 32.2 C (90.0 F) |
| 1993 | 36.7 C (98.1 F) |
| 1994 | 34.4 C (93.9 F) |
| 1995 | 35.6 C (96.1 F) |
| 1996 | 30.0 C (86.0 F) |
| 1997 | 32.8 C (91.0 F) |
| 1998 | 33.3 C (91.9 F) |
| 1999 | 36.1 C (97.0 F) |
| 2000 | 32.2 C (90.0 F) |
| 2001 | 35.0 C (95.0 F) |
| 2002 | 35.0 C (95.0 F) |
| 2003 | 33.3 C (91.9 F) |
| 2004 | 33.3 C (91.9 F) |
| 2005 | 34.4 C (93.9 F) |
| 2006 | 35.0 C (95.0 F) |
| 2007 | 34.4 C (93.9 F) |
| 2008 | 31.1 C (88.0 F) |
| 2009 | 33.3 C (91.9 F) |
| 2010 | 35.0 C (95.0 F) |
| 2011 | 37.8 C (100.0 F) |
| 2012 | 33.9 C (93.0 F) |
| 2013 | 35.0 C (95.0 F) |
| 2014 | 31.1 C (88.0 F) |
| 2015 | 33.3 C (91.9 F) |
| 2016 | 37.2 C (99.0 F) |
| 2017 | 33.9 C (93.0 F) |
| 2018 | 33.9 C (93.0 F) |
| 2019 | 34.4 C (93.9 F) |
| 2020 | 34.4 C (93.9 F) |
| 2021 | 36.1 C (97.0 F) |
| 2022 | 35.6 C (96.1 F) |
| 2023 | 31.7 C (89.1 F) |
| 2024 | 34.4 C (93.9 F) |
| 2025 | 37.2 C (99.0 F) |
| 2026 | 35.6 C (96.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1940 | -26.7 C (-16.1 F) |
| 1941 | -25.6 C (-14.1 F) |
| 1942 | -26.7 C (-16.1 F) |
| 1943 | -39.4 C (-38.9 F) |
| 1944 | -25.0 C (-13.0 F) |
| 1945 | -27.8 C (-18.0 F) |
| 1946 | -27.8 C (-18.0 F) |
| 1947 | -28.3 C (-18.9 F) |
| 1948 | -29.4 C (-20.9 F) |
| 1949 | -24.4 C (-11.9 F) |
| 1950 | -29.4 C (-20.9 F) |
| 1951 | -25.0 C (-13.0 F) |
| 1952 | -23.3 C (-9.9 F) |
| 1953 | -18.3 C (-0.9 F) |
| 1954 | -28.3 C (-18.9 F) |
| 1955 | -25.6 C (-14.1 F) |
| 1956 | -22.8 C (-9.0 F) |
| 1957 | -28.9 C (-20.0 F) |
| 1958 | -26.7 C (-16.1 F) |
| 1959 | -25.0 C (-13.0 F) |
| 1960 | -22.2 C (-8.0 F) |
| 1961 | -30.0 C (-22.0 F) |
| 1962 | -24.4 C (-11.9 F) |
| 1963 | -29.4 C (-20.9 F) |
| 1964 | -24.4 C (-11.9 F) |
| 1965 | -25.0 C (-13.0 F) |
| 1966 | -24.4 C (-11.9 F) |
| 1967 | -30.0 C (-22.0 F) |
| 1968 | -28.9 C (-20.0 F) |
| 1969 | -21.1 C (-6.0 F) |
| 1970 | -25.6 C (-14.1 F) |
| 1971 | -32.2 C (-26.0 F) |
| 1972 | -27.8 C (-18.0 F) |
| 1973 | -24.4 C (-11.9 F) |
| 1974 | -26.7 C (-16.1 F) |
| 1975 | -28.9 C (-20.0 F) |
| 1976 | -28.9 C (-20.0 F) |
| 1977 | -26.1 C (-15.0 F) |
| 1978 | -25.6 C (-14.1 F) |
| 1979 | -25.0 C (-13.0 F) |
| 1980 | -28.9 C (-20.0 F) |
| 1981 | -27.8 C (-18.0 F) |
| 1982 | -26.7 C (-16.1 F) |
| 1983 | -22.8 C (-9.0 F) |
| 1984 | -28.3 C (-18.9 F) |
| 1985 | -22.8 C (-9.0 F) |
| 1986 | -22.2 C (-8.0 F) |
| 1987 | -23.9 C (-11.0 F) |
| 1988 | -25.0 C (-13.0 F) |
| 1989 | -25.0 C (-13.0 F) |
| 1990 | -19.4 C (-2.9 F) |
| 1991 | -18.9 C (-2.0 F) |
| 1992 | -21.7 C (-7.1 F) |
| 1993 | -26.7 C (-16.1 F) |
| 1994 | -27.8 C (-18.0 F) |
| 1995 | -23.3 C (-9.9 F) |
| 1996 | -24.4 C (-11.9 F) |
| 1997 | -21.1 C (-6.0 F) |
| 1998 | -21.1 C (-6.0 F) |
| 1999 | -25.0 C (-13.0 F) |
| 2000 | -25.0 C (-13.0 F) |
| 2001 | -18.9 C (-2.0 F) |
| 2002 | -19.4 C (-2.9 F) |
| 2003 | -27.2 C (-17.0 F) |
| 2004 | -23.9 C (-11.0 F) |
| 2005 | -25.0 C (-13.0 F) |
| 2006 | -17.2 C (1.0 F) |
| 2007 | -21.7 C (-7.1 F) |
| 2008 | -20.6 C (-5.1 F) |
| 2009 | -26.7 C (-16.1 F) |
| 2010 | -18.3 C (-0.9 F) |
| 2011 | -25.0 C (-13.0 F) |
| 2012 | -20.0 C (-4.0 F) |
| 2013 | -21.0 C (-5.8 F) |
| 2014 | -25.5 C (-13.9 F) |
| 2015 | -23.8 C (-10.8 F) |
| 2016 | -23.2 C (-9.8 F) |
| 2017 | -24.9 C (-12.8 F) |
| 2018 | -27.1 C (-16.8 F) |
| 2019 | -18.8 C (-1.8 F) |
| 2020 | -19.9 C (-3.8 F) |
| 2021 | -18.2 C (-0.8 F) |
| 2022 | -21.6 C (-6.9 F) |
| 2023 | -25.5 C (-13.9 F) |
| 2024 | -14.9 C (5.2 F) |
| 2025 | -21.6 C (-6.9 F) |
| 2026 | -21.7 C (-7.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1940 | 17.5 mm (0.7 in) |
| 1941 | 43.2 mm (1.7 in) |
| 1942 | 55.9 mm (2.2 in) |
| 1943 | 49.8 mm (2.0 in) |
| 1944 | 68.3 mm (2.7 in) |
| 1945 | 76.2 mm (3.0 in) |
| 1946 | 105.2 mm (4.1 in) |
| 1947 | 65.3 mm (2.6 in) |
| 1948 | 52.6 mm (2.1 in) |
| 1949 | 77.2 mm (3.0 in) |
| 1950 | 43.7 mm (1.7 in) |
| 1951 | 88.1 mm (3.5 in) |
| 1952 | 60.2 mm (2.4 in) |
| 1953 | 63.2 mm (2.5 in) |
| 1954 | 190.2 mm (7.5 in) |
| 1955 | 77.5 mm (3.1 in) |
| 1956 | 46.5 mm (1.8 in) |
| 1957 | 48.8 mm (1.9 in) |
| 1958 | 45.7 mm (1.8 in) |
| 1959 | 55.4 mm (2.2 in) |
| 1960 | 69.9 mm (2.8 in) |
| 1961 | 61.5 mm (2.4 in) |
| 1962 | 190.2 mm (7.5 in) |
| 1963 | 67.6 mm (2.7 in) |
| 1964 | 33.8 mm (1.3 in) |
| 1965 | 81.5 mm (3.2 in) |
| 1966 | 60.5 mm (2.4 in) |
| 1967 | 102.4 mm (4.0 in) |
| 1968 | 55.4 mm (2.2 in) |
| 1969 | 79.2 mm (3.1 in) |
| 1970 | 57.7 mm (2.3 in) |
| 1971 | 70.1 mm (2.8 in) |
| 1972 | 73.7 mm (2.9 in) |
| 1973 | 132.3 mm (5.2 in) |
| 1974 | 38.9 mm (1.5 in) |
| 1975 | 69.6 mm (2.7 in) |
| 1976 | 65.5 mm (2.6 in) |
| 1977 | 90.4 mm (3.6 in) |
| 1978 | 57.4 mm (2.3 in) |
| 1979 | 91.2 mm (3.6 in) |
| 1980 | 73.2 mm (2.9 in) |
| 1981 | 88.4 mm (3.5 in) |
| 1982 | 56.1 mm (2.2 in) |
| 1983 | 75.4 mm (3.0 in) |
| 1984 | 80.3 mm (3.2 in) |
| 1985 | 69.1 mm (2.7 in) |
| 1986 | 47.5 mm (1.9 in) |
| 1987 | 69.9 mm (2.8 in) |
| 1988 | 63.5 mm (2.5 in) |
| 1989 | 84.3 mm (3.3 in) |
| 1990 | 119.4 mm (4.7 in) |
| 1991 | 196.9 mm (7.8 in) |
| 1992 | 60.7 mm (2.4 in) |
| 1993 | 44.7 mm (1.8 in) |
| 1994 | 102.6 mm (4.0 in) |
| 1995 | 43.9 mm (1.7 in) |
| 1996 | 298.2 mm (11.7 in) |
| 1997 | 68.3 mm (2.7 in) |
| 1998 | 142.5 mm (5.6 in) |
| 1999 | 112.8 mm (4.4 in) |
| 2000 | 56.4 mm (2.2 in) |
| 2001 | 85.3 mm (3.4 in) |
| 2002 | 50.8 mm (2.0 in) |
| 2003 | 41.4 mm (1.6 in) |
| 2004 | 61.2 mm (2.4 in) |
| 2005 | 112.5 mm (4.4 in) |
| 2006 | 86.6 mm (3.4 in) |
| 2007 | 99.3 mm (3.9 in) |
| 2008 | 96.3 mm (3.8 in) |
| 2009 | 127.8 mm (5.0 in) |
| 2010 | 97.3 mm (3.8 in) |
| 2011 | 63.2 mm (2.5 in) |
| 2012 | 92.2 mm (3.6 in) |
| 2013 | 63.0 mm (2.5 in) |
| 2014 | 163.3 mm (6.4 in) |
| 2015 | 141.2 mm (5.6 in) |
| 2016 | 96.8 mm (3.8 in) |
| 2017 | 48.5 mm (1.9 in) |
| 2018 | 61.0 mm (2.4 in) |
| 2019 | 86.4 mm (3.4 in) |
| 2020 | 63.8 mm (2.5 in) |
| 2021 | 70.6 mm (2.8 in) |
| 2022 | 70.9 mm (2.8 in) |
| 2023 | 63.5 mm (2.5 in) |
| 2024 | 61.7 mm (2.4 in) |
| 2025 | 58.9 mm (2.3 in) |
| 2026 | 50.3 mm (2.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1940 | 27.7 mm (1.1 in) |
| 1941 | 67.1 mm (2.6 in) |
| 1942 | 107.6 mm (4.2 in) |
| 1943 | 79.5 mm (3.1 in) |
| 1944 | 133.9 mm (5.3 in) |
| 1945 | 89.2 mm (3.5 in) |
| 1946 | 108.5 mm (4.3 in) |
| 1947 | 83.0 mm (3.3 in) |
| 1948 | 88.9 mm (3.5 in) |
| 1949 | 85.1 mm (3.4 in) |
| 1950 | 65.3 mm (2.6 in) |
| 1951 | 133.1 mm (5.2 in) |
| 1952 | 81.3 mm (3.2 in) |
| 1953 | 113.3 mm (4.5 in) |
| 1954 | 206.0 mm (8.1 in) |
| 1955 | 118.7 mm (4.7 in) |
| 1956 | 97.8 mm (3.9 in) |
| 1957 | 73.7 mm (2.9 in) |
| 1958 | 105.6 mm (4.2 in) |
| 1959 | 71.7 mm (2.8 in) |
| 1960 | 84.2 mm (3.3 in) |
| 1961 | 87.2 mm (3.4 in) |
| 1962 | 249.4 mm (9.8 in) |
| 1963 | 134.7 mm (5.3 in) |
| 1964 | 75.4 mm (3.0 in) |
| 1965 | 93.2 mm (3.7 in) |
| 1966 | 93.6 mm (3.7 in) |
| 1967 | 150.9 mm (5.9 in) |
| 1968 | 85.4 mm (3.4 in) |
| 1969 | 125.2 mm (4.9 in) |
| 1970 | 58.9 mm (2.3 in) |
| 1971 | 80.8 mm (3.2 in) |
| 1972 | 73.7 mm (2.9 in) |
| 1973 | 164.8 mm (6.5 in) |
| 1974 | 76.5 mm (3.0 in) |
| 1975 | 89.9 mm (3.5 in) |
| 1976 | 98.5 mm (3.9 in) |
| 1977 | 128.2 mm (5.0 in) |
| 1978 | 79.2 mm (3.1 in) |
| 1979 | 108.1 mm (4.3 in) |
| 1980 | 78.3 mm (3.1 in) |
| 1981 | 122.2 mm (4.8 in) |
| 1982 | 91.7 mm (3.6 in) |
| 1983 | 109.0 mm (4.3 in) |
| 1984 | 184.7 mm (7.3 in) |
| 1985 | 87.1 mm (3.4 in) |
| 1986 | 59.7 mm (2.4 in) |
| 1987 | 87.7 mm (3.5 in) |
| 1988 | 122.2 mm (4.8 in) |
| 1989 | 127.8 mm (5.0 in) |
| 1990 | 167.7 mm (6.6 in) |
| 1991 | 245.4 mm (9.7 in) |
| 1992 | 68.6 mm (2.7 in) |
| 1993 | 71.6 mm (2.8 in) |
| 1994 | 121.6 mm (4.8 in) |
| 1995 | 86.4 mm (3.4 in) |
| 1996 | 375.7 mm (14.8 in) |
| 1997 | 79.2 mm (3.1 in) |
| 1998 | 225.6 mm (8.9 in) |
| 1999 | 123.2 mm (4.9 in) |
| 2000 | 93.5 mm (3.7 in) |
| 2001 | 107.9 mm (4.2 in) |
| 2002 | 63.2 mm (2.5 in) |
| 2003 | 61.2 mm (2.4 in) |
| 2004 | 98.9 mm (3.9 in) |
| 2005 | 179.6 mm (7.1 in) |
| 2006 | 148.9 mm (5.9 in) |
| 2007 | 143.3 mm (5.6 in) |
| 2008 | 147.6 mm (5.8 in) |
| 2009 | 133.4 mm (5.3 in) |
| 2010 | 156.8 mm (6.2 in) |
| 2011 | 85.1 mm (3.4 in) |
| 2012 | 178.3 mm (7.0 in) |
| 2013 | 93.7 mm (3.7 in) |
| 2014 | 164.1 mm (6.5 in) |
| 2015 | 149.8 mm (5.9 in) |
| 2016 | 108.8 mm (4.3 in) |
| 2017 | 94.0 mm (3.7 in) |
| 2018 | 83.1 mm (3.3 in) |
| 2019 | 101.9 mm (4.0 in) |
| 2020 | 85.1 mm (3.4 in) |
| 2021 | 111.5 mm (4.4 in) |
| 2022 | 141.0 mm (5.6 in) |
| 2023 | 97.0 mm (3.8 in) |
| 2024 | 130.0 mm (5.1 in) |
| 2025 | 82.0 mm (3.2 in) |
| 2026 | 89.0 mm (3.5 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1940 | 9 days |
| 1941 | 19 days |
| 1942 | 17 days |
| 1943 | 14 days |
| 1944 | 15 days |
| 1945 | 15 days |
| 1946 | 15 days |
| 1947 | 28 days |
| 1948 | 17 days |
| 1949 | 15 days |
| 1950 | 28 days |
| 1951 | 12 days |
| 1952 | 11 days |
| 1953 | 21 days |
| 1954 | 14 days |
| 1955 | 19 days |
| 1956 | 17 days |
| 1957 | 13 days |
| 1958 | 16 days |
| 1959 | 17 days |
| 1960 | 13 days |
| 1961 | 26 days |
| 1962 | 12 days |
| 1963 | 28 days |
| 1964 | 15 days |
| 1965 | 20 days |
| 1966 | 13 days |
| 1967 | 14 days |
| 1968 | 20 days |
| 1969 | 14 days |
| 1970 | 17 days |
| 1971 | 17 days |
| 1972 | 11 days |
| 1973 | 15 days |
| 1974 | 19 days |
| 1975 | 16 days |
| 1976 | 22 days |
| 1977 | 18 days |
| 1978 | 23 days |
| 1979 | 12 days |
| 1980 | 23 days |
| 1981 | 15 days |
| 1982 | 17 days |
| 1983 | 16 days |
| 1984 | 16 days |
| 1985 | 15 days |
| 1986 | 12 days |
| 1987 | 28 days |
| 1988 | 15 days |
| 1989 | 13 days |
| 1990 | 15 days |
| 1991 | 18 days |
| 1992 | 14 days |
| 1993 | 13 days |
| 1994 | 13 days |
| 1995 | 22 days |
| 1996 | 20 days |
| 1997 | 19 days |
| 1998 | 18 days |
| 1999 | 19 days |
| 2000 | 15 days |
| 2001 | 15 days |
| 2002 | 21 days |
| 2003 | 17 days |
| 2004 | 21 days |
| 2005 | 15 days |
| 2006 | 17 days |
| 2007 | 15 days |
| 2008 | 26 days |
| 2009 | 14 days |
| 2010 | 20 days |
| 2011 | 15 days |
| 2012 | 19 days |
| 2013 | 16 days |
| 2014 | 16 days |
| 2015 | 16 days |
| 2016 | 15 days |
| 2017 | 18 days |
| 2018 | 14 days |
| 2019 | 18 days |
| 2020 | 21 days |
| 2021 | 16 days |
| 2022 | 15 days |
| 2023 | 17 days |
| 2024 | 24 days |
| 2025 | 15 days |
| 2026 | 19 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
85 years with a frostAcross 85 years with a frost, the median last spring frost at Portland Jetport falls on 4 May and the median first autumn frost on 7 October, which leaves a median of 154 days between them.
In 1996 to 2025 the median growing season was 167 days. That is 31 days more than in 1941 to 1970.
Fitted over all years, the growing season changes by +4.7 days per decade at this station.
| Measure | Median, all years | Earliest period (1941 to 1970) | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 4 May | 14 May | 30 April | 14 days earlier | -1.8 days per decade |
| First autumn frost | 7 October | 27 September | 11 October | 14 days later | +2.9 days per decade |
| Growing days | 154 days | 136 days | 167 days | 31 days more | +4.7 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
85 years, 1941 to 2025A day with at least 69.5 mm (2.7 in) of rain is expected about once in 2 years. A day with at least 250.2 mm (9.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 69.5 mm (2.7 in) | |
| 5 years | 98.4 mm (3.9 in) | |
| 10 years | 123.6 mm (4.9 in) | |
| 25 years | 164.5 mm (6.5 in) | |
| 50 years | 203.1 mm (8.0 in) | |
| 100 years | 250.2 mm (9.9 in) | Longer than the 85 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, 85 years of values from 1941 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: 298.2 mm (11.7 in) in 1996; 196.9 mm (7.8 in) in 1991; 190.2 mm (7.5 in) in 1954.
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, Portland Jetport had a mean temperature of 8.9 C (48.0 F) and 1,211.2 mm (47.7 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Blue Hill Coop (United States, 172 km away), Blue Hill Lcd (United States, 172 km away) and Reading (United States, 141 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Blue Hill Coop | United States | 172 km (107 mi) | 9.0 C (48.3 F) | 1,244.0 mm (49.0 in) | 0.51 |
| Blue Hill Lcd | United States | 172 km (107 mi) | 9.2 C (48.5 F) | 1,244.1 mm (49.0 in) | 0.56 |
| Reading | United States | 141 km (88 mi) | 8.9 C (48.0 F) | 1,185.3 mm (46.7 in) | 0.57 |
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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-14).