Islip-Li Macarthur AP Weather Records (USW00004781)
Record envelope, standing records and threshold days for Islip-Li Macarthur AP (USW00004781), New York, United States, with 64 years of record.
Key Facts for Islip-Li Macarthur AP
- Islip-Li Macarthur AP (USW00004781) is a weather station in New York, United States at 40.79 latitude and -73.10 longitude, 25 m (83 ft) above sea level.
- The station reports from 1963 to 2026, 64 years of record.
- 1,464 records set at Islip-Li Macarthur AP still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Islip-Li Macarthur AP tied a daily record high minimum temperature of 18.3 C (64.9 F) on 2 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: New York, United States, 40.79 latitude, -73.10 longitude.
- Elevation: 25 m (83 ft).
- Period of record: 1963 to 2026, 64 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
6 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 20.6 C (69.1 F) | -22.2 C (-8.0 F) | 10.6 C (51.1 F) | -17.8 C (0.0 F) |
| Feb | 21.7 C (71.1 F) | -25.6 C (-14.1 F) | 8.9 C (48.0 F) | -15.6 C (3.9 F) |
| Mar | 27.8 C (82.0 F) | -17.8 C (0.0 F) | 20.0 C (68.0 F) | -7.8 C (18.0 F) |
| Apr | 34.4 C (93.9 F) | -8.9 C (16.0 F) | 27.8 C (82.0 F) | -2.8 C (27.0 F) |
| May | 36.7 C (98.1 F) | 0.0 C (32.0 F) | 33.9 C (93.0 F) | 4.4 C (39.9 F) |
| Jun | 38.3 C (100.9 F) | 5.6 C (42.1 F) | 34.4 C (93.9 F) | 7.8 C (46.0 F) |
| Jul | 40.0 C (104.0 F) | 9.4 C (48.9 F) | 36.7 C (98.1 F) | 14.4 C (57.9 F) |
| Aug | 37.8 C (100.0 F) | 7.2 C (45.0 F) | 32.8 C (91.0 F) | 15.6 C (60.1 F) |
| Sep | 34.4 C (93.9 F) | 3.3 C (37.9 F) | 30.0 C (86.0 F) | 11.1 C (52.0 F) |
| Oct | 31.7 C (89.1 F) | -5.0 C (23.0 F) | 26.1 C (79.0 F) | 3.9 C (39.0 F) |
| Nov | 26.7 C (80.1 F) | -11.7 C (10.9 F) | n/a | n/a |
| Dec | 25.0 C (77.0 F) | -18.3 C (-0.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1963 | 23 |
| 1964 | 31 |
| 1965 | 43 |
| 1966 | 24 |
| 1967 | 45 |
| 1968 | 38 |
| 1969 | 25 |
| 1970 | 19 |
| 1971 | 24 |
| 1972 | 18 |
| 1973 | 28 |
| 1974 | 36 |
| 1975 | 24 |
| 1976 | 32 |
| 1977 | 27 |
| 1978 | 23 |
| 1979 | 45 |
| 1980 | 19 |
| 1981 | 10 |
| 1982 | 22 |
| 1983 | 20 |
| 1984 | 24 |
| 1985 | 15 |
| 1986 | 27 |
| 1987 | 21 |
| 1988 | 23 |
| 1989 | 24 |
| 1990 | 30 |
| 1991 | 38 |
| 1992 | 23 |
| 1993 | 19 |
| 1994 | 15 |
| 1995 | 25 |
| 1996 | 18 |
| 1997 | 16 |
| 1998 | 23 |
| 1999 | 23 |
| 2000 | 26 |
| 2001 | 22 |
| 2002 | 35 |
| 2003 | 15 |
| 2004 | 12 |
| 2005 | 16 |
| 2006 | 11 |
| 2007 | 20 |
| 2008 | 18 |
| 2009 | 22 |
| 2010 | 28 |
| 2011 | 10 |
| 2012 | 24 |
| 2013 | 9 |
| 2014 | 17 |
| 2015 | 26 |
| 2016 | 24 |
| 2017 | 27 |
| 2018 | 26 |
| 2019 | 12 |
| 2020 | 12 |
| 2021 | 19 |
| 2022 | 23 |
| 2023 | 22 |
| 2024 | 17 |
| 2025 | 19 |
| 2026 | 12 |
All-Time Record Progression
7 new records| Date | Kind | Detail |
|---|---|---|
| 1999-07-05 | Record high minimum temperature | Record high minimum temperature 25.6 C (78.1 F) |
| 1999-07-06 | Record high minimum temperature | Record high minimum temperature 27.2 C (81.0 F) |
| 2006-02-12 | Record daily snowfall | Record daily snowfall 42.4 cm (16.7 in) |
| 2014-08-13 | Record daily precipitation | Record daily precipitation 343.2 mm (13.5 in) |
| 2015-01-27 | Record daily snowfall | Record daily snowfall 44.2 cm (17.4 in) |
| 2016-01-23 | Record daily snowfall | Record daily snowfall 59.4 cm (23.4 in) |
| 2022-01-29 | Record daily snowfall | Record daily snowfall 59.7 cm (23.5 in) |
Wettest Day of Each Month
Aug: 343.2 mm (13.5 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 91.7 mm (3.6 in) | 3 January 1999 |
| Feb | 61.5 mm (2.4 in) | 25 February 2010 |
| Mar | 82.6 mm (3.3 in) | 9 March 1998 |
| Apr | 117.6 mm (4.6 in) | 23 April 2006 |
| May | 101.9 mm (4.0 in) | 16 May 1989 |
| Jun | 123.7 mm (4.9 in) | 6 June 2000 |
| Jul | 118.1 mm (4.6 in) | 16 July 2023 |
| Aug | 343.2 mm (13.5 in) | 13 August 2014 |
| Sep | 79.2 mm (3.1 in) | 15 September 1966 |
| Oct | 136.7 mm (5.4 in) | 14 October 2005 |
| Nov | 66.8 mm (2.6 in) | 20 November 1988 |
| Dec | 77.2 mm (3.0 in) | 28 December 2023 |
Period of Record Coverage
1963 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1963 | 113 | 31% | No |
| 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 | 364 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 364 | 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 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 286 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 2 October 2026 | Islip-Li Macarthur AP, US | daily high min (Tie, Provisional) | 18.3 C (64.9 F) | tie | 24 years | 3 of 100 (Routine) |
| 27 September 2026 | Islip-Li Macarthur AP, US | daily rain (Provisional) | 48.8 mm (1.9 in) | 17.0 mm (0.7 in) | 51 years | 33 of 100 (Routine) |
| 13 September 2026 | Islip-Li Macarthur AP, US | daily rain (Provisional) | 77.7 mm (3.1 in) | 31.5 mm (1.2 in) | 55 years | 44 of 100 (Notable) |
| 20 August 2026 | Islip-Li Macarthur AP, US | daily rain (Provisional) | 83.1 mm (3.3 in) | 16.8 mm (0.7 in) | 24 years | 20 of 100 (Routine) |
| 6 August 2026 | Islip-Li Macarthur AP, US | daily high min (Tie) | 24.4 C (75.9 F) | tie | 45 years | 4 of 100 (Routine) |
| 3 August 2026 | Islip-Li Macarthur AP, US | daily rain | 49.5 mm (1.9 in) | 15.0 mm (0.6 in) | 39 years | 23 of 100 (Routine) |
| 29 July 2026 | Islip-Li Macarthur AP, US | daily rain | 53.8 mm (2.1 in) | 28.4 mm (1.1 in) | 9 years | 28 of 100 (Routine) |
| 6 July 2026 | Islip-Li Macarthur AP, US | daily rain | 63.5 mm (2.5 in) | 40.1 mm (1.6 in) | 20 years | 41 of 100 (Notable) |
| 6 July 2026 | Islip-Li Macarthur AP, US | daily low max | 20.6 C (69.1 F) | 2.2 C (4.0 F) | 53 years | 28 of 100 (Routine) |
| 12 June 2026 | Islip-Li Macarthur AP, US | daily high min | 22.2 C (72.0 F) | 1.1 C (2.0 F) | 52 years | 24 of 100 (Routine) |
| 12 June 2026 | Islip-Li Macarthur AP, US | daily high max | 34.4 C (93.9 F) | 1.6 C (2.9 F) | 8 years | 12 of 100 (Routine) |
| 5 June 2026 | Islip-Li Macarthur AP, US | daily high max (Tie) | 31.1 C (88.0 F) | tie | 16 years | 2 of 100 (Routine) |
| 20 May 2026 | Islip-Li Macarthur AP, US | daily high min | 18.9 C (66.0 F) | 2.2 C (4.0 F) | 29 years | 19 of 100 (Routine) |
| 16 April 2026 | Islip-Li Macarthur AP, US | daily high min | 14.4 C (57.9 F) | 1.6 C (2.9 F) | 24 years | 17 of 100 (Routine) |
| 15 April 2026 | Islip-Li Macarthur AP, US | daily high max | 27.2 C (81.0 F) | 1.6 C (2.9 F) | 24 years | 16 of 100 (Routine) |
| 15 April 2026 | Islip-Li Macarthur AP, US | daily high min | 13.9 C (57.0 F) | 0.6 C (1.1 F) | 3 years | 7 of 100 (Routine) |
| 1 April 2026 | Islip-Li Macarthur AP, US | daily high max | 22.2 C (72.0 F) | 2.8 C (5.0 F) | 27 years | 19 of 100 (Routine) |
| 11 March 2026 | Islip-Li Macarthur AP, US | daily high min (Tie) | 7.2 C (45.0 F) | tie | 9 years | 2 of 100 (Routine) |
| 9 March 2026 | Islip-Li Macarthur AP, US | daily high max (Tie) | 20.0 C (68.0 F) | tie | 9 years | 2 of 100 (Routine) |
| 1 March 2026 | Islip-Li Macarthur AP, US | daily snow depth | 22.9 cm (9.0 in) | 2.6 cm (1.0 in) | 20 years | 15 of 100 (Routine) |
Climate Trend
62 complete years, 1964 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1964 | 10.5 C | -0.92 C |
| 1965 | 9.8 C | -1.60 C |
| 1966 | 10.7 C | -0.75 C |
| 1967 | 9.8 C | -1.68 C |
| 1968 | 9.6 C | -1.81 C |
| 1969 | 10.9 C | -0.56 C |
| 1970 | 10.8 C | -0.67 C |
| 1971 | 11.4 C | -0.06 C |
| 1972 | 10.9 C | -0.53 C |
| 1973 | 11.9 C | +0.42 C |
| 1974 | 11.0 C | -0.43 C |
| 1975 | 11.4 C | -0.09 C |
| 1976 | 10.5 C | -0.91 C |
| 1977 | 10.8 C | -0.60 C |
| 1978 | 9.9 C | -1.58 C |
| 1979 | 10.9 C | -0.58 C |
| 1980 | 11.6 C | +0.14 C |
| 1981 | 11.1 C | -0.39 C |
| 1982 | 11.2 C | -0.23 C |
| 1983 | 11.6 C | +0.13 C |
| 1984 | 11.3 C | -0.19 C |
| 1985 | 11.2 C | -0.24 C |
| 1986 | 11.0 C | -0.47 C |
| 1987 | 11.1 C | -0.37 C |
| 1988 | 10.7 C | -0.71 C |
| 1989 | 10.6 C | -0.86 C |
| 1990 | 12.3 C | +0.88 C |
| 1991 | 12.4 C | +0.91 C |
| 1992 | 10.6 C | -0.89 C |
| 1993 | 11.1 C | -0.31 C |
| 1994 | 11.3 C | -0.15 C |
| 1995 | 11.7 C | +0.29 C |
| 1996 | 10.7 C | -0.71 C |
| 1997 | 11.2 C | -0.21 C |
| 1998 | 12.8 C | +1.33 C |
| 1999 | 12.4 C | +0.97 C |
| 2000 | 10.7 C | -0.73 C |
| 2001 | 11.6 C | +0.18 C |
| 2002 | 12.0 C | +0.55 C |
| 2003 | 10.7 C | -0.74 C |
| 2004 | 10.7 C | -0.73 C |
| 2005 | 11.3 C | -0.19 C |
| 2006 | 12.2 C | +0.74 C |
| 2007 | 11.4 C | -0.03 C |
| 2008 | 11.7 C | +0.27 C |
| 2009 | 11.0 C | -0.45 C |
| 2010 | 12.2 C | +0.78 C |
| 2011 | 12.3 C | +0.90 C |
| 2012 | 12.9 C | +1.48 C |
| 2013 | 11.7 C | +0.22 C |
| 2014 | 11.4 C | -0.06 C |
| 2015 | 11.9 C | +0.49 C |
| 2016 | 12.6 C | +1.19 C |
| 2017 | 12.3 C | +0.87 C |
| 2018 | 12.1 C | +0.61 C |
| 2019 | 11.9 C | +0.46 C |
| 2020 | 12.7 C | +1.30 C |
| 2021 | 12.6 C | +1.18 C |
| 2022 | 12.4 C | +0.96 C |
| 2023 | 13.0 C | +1.55 C |
| 2024 | 12.9 C | +1.45 C |
| 2025 | 12.6 C | +1.16 C |
The annual mean temperature here has risen by 0.3 C (0.3 to 0.4) per decade over 1964 to 2025. In Fahrenheit: 0.6 F (0.5 to 0.8) per decade. The slope is a straight line fitted to 62 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.3 C (0.3 to 0.4) per decade | 0.6 F (0.5 to 0.8) per decade | 1964 to 2025 | 62 | Rise |
| Mean daily maximum | 0.3 C (0.2 to 0.4) per decade | 0.6 F (0.4 to 0.8) per decade | 1964 to 2025 | 62 | Rise |
| Mean daily minimum | 0.3 C (0.3 to 0.4) per decade | 0.6 F (0.5 to 0.8) per decade | 1964 to 2025 | 62 | 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
1963 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.0 C (104.0 F) | 1966 | 35.0 C (95.0 F) | 64 |
| Coldest night (TNn) | -25.6 C (-14.1 F) | 1967 | -15.8 C (3.6 F) | 64 |
| Wettest day (Rx1day) | 343.2 mm (13.5 in) | 2014 | 73.4 mm (2.9 in) | 64 |
| Wettest five days (Rx5day) | 344.7 mm (13.6 in) | 2014 | 103.0 mm (4.1 in) | 64 |
| Longest dry spell (CDD) | 33 days | 2024 | 18 days | 64 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1963 | 27.2 C (81.0 F) |
| 1964 | 35.6 C (96.1 F) |
| 1965 | 33.3 C (91.9 F) |
| 1966 | 40.0 C (104.0 F) |
| 1967 | 31.7 C (89.1 F) |
| 1968 | 33.9 C (93.0 F) |
| 1969 | 35.0 C (95.0 F) |
| 1970 | 32.2 C (90.0 F) |
| 1971 | 33.3 C (91.9 F) |
| 1972 | 34.4 C (93.9 F) |
| 1973 | 35.6 C (96.1 F) |
| 1974 | 34.4 C (93.9 F) |
| 1975 | 37.8 C (100.0 F) |
| 1976 | 32.2 C (90.0 F) |
| 1977 | 35.6 C (96.1 F) |
| 1978 | 33.9 C (93.0 F) |
| 1979 | 31.7 C (89.1 F) |
| 1980 | 34.4 C (93.9 F) |
| 1981 | 35.0 C (95.0 F) |
| 1982 | 32.8 C (91.0 F) |
| 1983 | 35.0 C (95.0 F) |
| 1984 | 33.3 C (91.9 F) |
| 1985 | 32.8 C (91.0 F) |
| 1986 | 35.0 C (95.0 F) |
| 1987 | 35.0 C (95.0 F) |
| 1988 | 35.0 C (95.0 F) |
| 1989 | 33.9 C (93.0 F) |
| 1990 | 34.4 C (93.9 F) |
| 1991 | 38.3 C (100.9 F) |
| 1992 | 33.3 C (91.9 F) |
| 1993 | 36.7 C (98.1 F) |
| 1994 | 35.6 C (96.1 F) |
| 1995 | 36.1 C (97.0 F) |
| 1996 | 36.7 C (98.1 F) |
| 1997 | 35.6 C (96.1 F) |
| 1998 | 35.6 C (96.1 F) |
| 1999 | 38.9 C (102.0 F) |
| 2000 | 33.3 C (91.9 F) |
| 2001 | 37.8 C (100.0 F) |
| 2002 | 35.6 C (96.1 F) |
| 2003 | 33.9 C (93.0 F) |
| 2004 | 30.6 C (87.1 F) |
| 2005 | 35.0 C (95.0 F) |
| 2006 | 36.7 C (98.1 F) |
| 2007 | 33.9 C (93.0 F) |
| 2008 | 35.0 C (95.0 F) |
| 2009 | 32.8 C (91.0 F) |
| 2010 | 38.3 C (100.9 F) |
| 2011 | 37.8 C (100.0 F) |
| 2012 | 35.0 C (95.0 F) |
| 2013 | 35.0 C (95.0 F) |
| 2014 | 31.7 C (89.1 F) |
| 2015 | 34.4 C (93.9 F) |
| 2016 | 36.1 C (97.0 F) |
| 2017 | 33.9 C (93.0 F) |
| 2018 | 35.0 C (95.0 F) |
| 2019 | 37.2 C (99.0 F) |
| 2020 | 35.0 C (95.0 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 35.0 C (95.0 F) |
| 2023 | 33.3 C (91.9 F) |
| 2024 | 33.9 C (93.0 F) |
| 2025 | 38.3 C (100.9 F) |
| 2026 | 36.7 C (98.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1963 | -18.3 C (-0.9 F) |
| 1964 | -13.3 C (8.1 F) |
| 1965 | -22.2 C (-8.0 F) |
| 1966 | -16.7 C (1.9 F) |
| 1967 | -25.6 C (-14.1 F) |
| 1968 | -20.0 C (-4.0 F) |
| 1969 | -12.2 C (10.0 F) |
| 1970 | -18.3 C (-0.9 F) |
| 1971 | -15.6 C (3.9 F) |
| 1972 | -14.4 C (6.1 F) |
| 1973 | -13.3 C (8.1 F) |
| 1974 | -17.8 C (0.0 F) |
| 1975 | -13.3 C (8.1 F) |
| 1976 | -17.8 C (0.0 F) |
| 1977 | -17.8 C (0.0 F) |
| 1978 | -17.2 C (1.0 F) |
| 1979 | -21.1 C (-6.0 F) |
| 1980 | -15.6 C (3.9 F) |
| 1981 | -20.0 C (-4.0 F) |
| 1982 | -18.9 C (-2.0 F) |
| 1983 | -16.1 C (3.0 F) |
| 1984 | -21.7 C (-7.1 F) |
| 1985 | -18.3 C (-0.9 F) |
| 1986 | -13.9 C (7.0 F) |
| 1987 | -15.0 C (5.0 F) |
| 1988 | -21.7 C (-7.1 F) |
| 1989 | -13.3 C (8.1 F) |
| 1990 | -13.3 C (8.1 F) |
| 1991 | -16.1 C (3.0 F) |
| 1992 | -13.3 C (8.1 F) |
| 1993 | -16.7 C (1.9 F) |
| 1994 | -17.2 C (1.0 F) |
| 1995 | -13.3 C (8.1 F) |
| 1996 | -17.2 C (1.0 F) |
| 1997 | -16.1 C (3.0 F) |
| 1998 | -11.7 C (10.9 F) |
| 1999 | -13.3 C (8.1 F) |
| 2000 | -14.4 C (6.1 F) |
| 2001 | -13.9 C (7.0 F) |
| 2002 | -13.3 C (8.1 F) |
| 2003 | -15.0 C (5.0 F) |
| 2004 | -17.2 C (1.0 F) |
| 2005 | -17.2 C (1.0 F) |
| 2006 | -10.6 C (12.9 F) |
| 2007 | -13.3 C (8.1 F) |
| 2008 | -12.2 C (10.0 F) |
| 2009 | -16.7 C (1.9 F) |
| 2010 | -11.1 C (12.0 F) |
| 2011 | -15.6 C (3.9 F) |
| 2012 | -12.2 C (10.0 F) |
| 2013 | -15.0 C (5.0 F) |
| 2014 | -17.7 C (0.1 F) |
| 2015 | -16.6 C (2.1 F) |
| 2016 | -17.7 C (0.1 F) |
| 2017 | -15.5 C (4.1 F) |
| 2018 | -16.6 C (2.1 F) |
| 2019 | -16.0 C (3.2 F) |
| 2020 | -10.5 C (13.1 F) |
| 2021 | -10.5 C (13.1 F) |
| 2022 | -14.3 C (6.3 F) |
| 2023 | -16.0 C (3.2 F) |
| 2024 | -12.1 C (10.2 F) |
| 2025 | -13.8 C (7.2 F) |
| 2026 | -17.8 C (0.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1963 | 63.2 mm (2.5 in) |
| 1964 | 62.2 mm (2.4 in) |
| 1965 | 40.9 mm (1.6 in) |
| 1966 | 79.2 mm (3.1 in) |
| 1967 | 71.9 mm (2.8 in) |
| 1968 | 51.6 mm (2.0 in) |
| 1969 | 99.3 mm (3.9 in) |
| 1970 | 52.1 mm (2.1 in) |
| 1971 | 59.2 mm (2.3 in) |
| 1972 | 115.1 mm (4.5 in) |
| 1973 | 50.0 mm (2.0 in) |
| 1974 | 67.3 mm (2.6 in) |
| 1975 | 81.8 mm (3.2 in) |
| 1976 | 79.0 mm (3.1 in) |
| 1977 | 56.1 mm (2.2 in) |
| 1978 | 76.2 mm (3.0 in) |
| 1979 | 75.4 mm (3.0 in) |
| 1980 | 52.8 mm (2.1 in) |
| 1981 | 82.6 mm (3.3 in) |
| 1982 | 103.9 mm (4.1 in) |
| 1983 | 81.0 mm (3.2 in) |
| 1984 | 68.3 mm (2.7 in) |
| 1985 | 54.1 mm (2.1 in) |
| 1986 | 37.1 mm (1.5 in) |
| 1987 | 64.0 mm (2.5 in) |
| 1988 | 66.8 mm (2.6 in) |
| 1989 | 101.9 mm (4.0 in) |
| 1990 | 171.2 mm (6.7 in) |
| 1991 | 150.1 mm (5.9 in) |
| 1992 | 89.4 mm (3.5 in) |
| 1993 | 57.7 mm (2.3 in) |
| 1994 | 45.5 mm (1.8 in) |
| 1995 | 45.7 mm (1.8 in) |
| 1996 | 85.1 mm (3.4 in) |
| 1997 | 52.8 mm (2.1 in) |
| 1998 | 101.1 mm (4.0 in) |
| 1999 | 91.7 mm (3.6 in) |
| 2000 | 123.7 mm (4.9 in) |
| 2001 | 71.9 mm (2.8 in) |
| 2002 | 69.1 mm (2.7 in) |
| 2003 | 72.4 mm (2.9 in) |
| 2004 | 93.7 mm (3.7 in) |
| 2005 | 136.7 mm (5.4 in) |
| 2006 | 117.6 mm (4.6 in) |
| 2007 | 84.8 mm (3.3 in) |
| 2008 | 60.7 mm (2.4 in) |
| 2009 | 56.6 mm (2.2 in) |
| 2010 | 67.6 mm (2.7 in) |
| 2011 | 135.1 mm (5.3 in) |
| 2012 | 105.2 mm (4.1 in) |
| 2013 | 105.4 mm (4.1 in) |
| 2014 | 343.2 mm (13.5 in) |
| 2015 | 58.4 mm (2.3 in) |
| 2016 | 54.1 mm (2.1 in) |
| 2017 | 102.1 mm (4.0 in) |
| 2018 | 79.0 mm (3.1 in) |
| 2019 | 55.4 mm (2.2 in) |
| 2020 | 69.9 mm (2.8 in) |
| 2021 | 113.5 mm (4.5 in) |
| 2022 | 41.4 mm (1.6 in) |
| 2023 | 118.1 mm (4.6 in) |
| 2024 | 71.1 mm (2.8 in) |
| 2025 | 74.4 mm (2.9 in) |
| 2026 | 83.1 mm (3.3 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1963 | 81.2 mm (3.2 in) |
| 1964 | 86.6 mm (3.4 in) |
| 1965 | 53.6 mm (2.1 in) |
| 1966 | 106.4 mm (4.2 in) |
| 1967 | 124.2 mm (4.9 in) |
| 1968 | 97.1 mm (3.8 in) |
| 1969 | 127.3 mm (5.0 in) |
| 1970 | 84.3 mm (3.3 in) |
| 1971 | 110.8 mm (4.4 in) |
| 1972 | 115.1 mm (4.5 in) |
| 1973 | 71.2 mm (2.8 in) |
| 1974 | 81.3 mm (3.2 in) |
| 1975 | 138.5 mm (5.5 in) |
| 1976 | 151.9 mm (6.0 in) |
| 1977 | 68.4 mm (2.7 in) |
| 1978 | 78.3 mm (3.1 in) |
| 1979 | 113.1 mm (4.5 in) |
| 1980 | 86.2 mm (3.4 in) |
| 1981 | 94.9 mm (3.7 in) |
| 1982 | 157.0 mm (6.2 in) |
| 1983 | 102.0 mm (4.0 in) |
| 1984 | 175.6 mm (6.9 in) |
| 1985 | 68.3 mm (2.7 in) |
| 1986 | 76.5 mm (3.0 in) |
| 1987 | 84.4 mm (3.3 in) |
| 1988 | 85.9 mm (3.4 in) |
| 1989 | 128.1 mm (5.0 in) |
| 1990 | 179.9 mm (7.1 in) |
| 1991 | 166.6 mm (6.6 in) |
| 1992 | 125.3 mm (4.9 in) |
| 1993 | 79.3 mm (3.1 in) |
| 1994 | 62.0 mm (2.4 in) |
| 1995 | 70.1 mm (2.8 in) |
| 1996 | 101.0 mm (4.0 in) |
| 1997 | 71.4 mm (2.8 in) |
| 1998 | 192.5 mm (7.6 in) |
| 1999 | 94.8 mm (3.7 in) |
| 2000 | 131.6 mm (5.2 in) |
| 2001 | 91.2 mm (3.6 in) |
| 2002 | 103.9 mm (4.1 in) |
| 2003 | 135.2 mm (5.3 in) |
| 2004 | 115.6 mm (4.6 in) |
| 2005 | 275.8 mm (10.9 in) |
| 2006 | 134.6 mm (5.3 in) |
| 2007 | 89.4 mm (3.5 in) |
| 2008 | 109.7 mm (4.3 in) |
| 2009 | 81.0 mm (3.2 in) |
| 2010 | 125.8 mm (5.0 in) |
| 2011 | 171.2 mm (6.7 in) |
| 2012 | 124.7 mm (4.9 in) |
| 2013 | 162.0 mm (6.4 in) |
| 2014 | 344.7 mm (13.6 in) |
| 2015 | 79.5 mm (3.1 in) |
| 2016 | 55.4 mm (2.2 in) |
| 2017 | 111.8 mm (4.4 in) |
| 2018 | 87.4 mm (3.4 in) |
| 2019 | 92.5 mm (3.6 in) |
| 2020 | 69.9 mm (2.8 in) |
| 2021 | 161.7 mm (6.4 in) |
| 2022 | 78.2 mm (3.1 in) |
| 2023 | 143.5 mm (5.6 in) |
| 2024 | 105.8 mm (4.2 in) |
| 2025 | 76.2 mm (3.0 in) |
| 2026 | 110.5 mm (4.4 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1963 | 28 days |
| 1964 | 28 days |
| 1965 | 23 days |
| 1966 | 32 days |
| 1967 | 22 days |
| 1968 | 25 days |
| 1969 | 18 days |
| 1970 | 16 days |
| 1971 | 16 days |
| 1972 | 31 days |
| 1973 | 29 days |
| 1974 | 18 days |
| 1975 | 22 days |
| 1976 | 28 days |
| 1977 | 17 days |
| 1978 | 20 days |
| 1979 | 18 days |
| 1980 | 24 days |
| 1981 | 18 days |
| 1982 | 21 days |
| 1983 | 13 days |
| 1984 | 26 days |
| 1985 | 17 days |
| 1986 | 18 days |
| 1987 | 16 days |
| 1988 | 16 days |
| 1989 | 16 days |
| 1990 | 17 days |
| 1991 | 16 days |
| 1992 | 13 days |
| 1993 | 12 days |
| 1994 | 23 days |
| 1995 | 24 days |
| 1996 | 16 days |
| 1997 | 15 days |
| 1998 | 13 days |
| 1999 | 17 days |
| 2000 | 21 days |
| 2001 | 21 days |
| 2002 | 13 days |
| 2003 | 20 days |
| 2004 | 22 days |
| 2005 | 31 days |
| 2006 | 23 days |
| 2007 | 20 days |
| 2008 | 15 days |
| 2009 | 17 days |
| 2010 | 17 days |
| 2011 | 14 days |
| 2012 | 19 days |
| 2013 | 19 days |
| 2014 | 23 days |
| 2015 | 23 days |
| 2016 | 15 days |
| 2017 | 13 days |
| 2018 | 15 days |
| 2019 | 16 days |
| 2020 | 15 days |
| 2021 | 16 days |
| 2022 | 12 days |
| 2023 | 22 days |
| 2024 | 33 days |
| 2025 | 17 days |
| 2026 | 16 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
62 years with a frostAcross 62 years with a frost, the median last spring frost at Islip-Li Macarthur AP falls on 12 April and the median first autumn frost on 31 October, which leaves a median of 202 days between them.
In 1996 to 2025 the median growing season was 206 days. That is 10 days more than in 1964 to 1993.
Fitted over all years, the growing season changes by +3.8 days per decade at this station.
| Measure | Median, all years | Earliest period (1964 to 1993) | Recent period (1996 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 12 April | 15 April | 10 April | 5 days earlier | -1.9 days per decade |
| First autumn frost | 31 October | 27 October | 2 November | 6 days later | +2.0 days per decade |
| Growing days | 202 days | 196 days | 206 days | 10 days more | +3.8 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
62 years, 1964 to 2025A day with at least 73.2 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 244.2 mm (9.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 73.2 mm (2.9 in) | |
| 5 years | 103.3 mm (4.1 in) | |
| 10 years | 128.4 mm (5.1 in) | |
| 25 years | 167.3 mm (6.6 in) | |
| 50 years | 202.6 mm (8.0 in) | |
| 100 years | 244.2 mm (9.6 in) | Longer than the 62 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, 62 years of values from 1964 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: 343.2 mm (13.5 in) in 2014; 171.2 mm (6.7 in) in 1990; 150.1 mm (5.9 in) in 1991.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Islip-Li Macarthur AP, at 2000 and 2011. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2000 ran 0.4 C (0.8 F) lower than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2011 ran 0.3 C (0.6 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 2000 | -0.4 | -0.8 | possible | 5 |
| 2011 | +0.3 | +0.6 | likely | 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, Islip-Li Macarthur AP had a mean temperature of 12.4 C (54.2 F) and 1,167.0 mm (45.9 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Tuckerton 2 NE (United States, 169 km away), Seabrook Farms (United States, 231 km away) and Millville Muni AP (United States, 231 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Tuckerton 2 NE | United States | 169 km (105 mi) | 12.0 C (53.6 F) | 1,160.3 mm (45.7 in) | 0.63 |
| Seabrook Farms | United States | 231 km (144 mi) | 12.2 C (53.9 F) | 1,098.9 mm (43.3 in) | 0.77 |
| Millville Muni AP | United States | 231 km (144 mi) | 12.2 C (54.0 F) | 1,075.0 mm (42.3 in) | 0.79 |
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 (2026-10-16).