Headquarters Weather Records (USC00104150)
Record envelope, standing records and threshold days for Headquarters (USC00104150), Idaho, United States, with 52 years of record.
Key Facts for Headquarters
- Headquarters (USC00104150) is a weather station in Idaho, United States at 46.63 latitude and -115.81 longitude, 975 m (3,200 ft) above sea level.
- The station reports from 1959 to 2010, 52 years of record.
- 1,464 records set at Headquarters still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Headquarters tied a daily record low minimum temperature of -4.4 C (24.1 F) on 5 May 2010.
About the Station
- Location: Idaho, United States, 46.63 latitude, -115.81 longitude.
- Elevation: 975 m (3,200 ft).
- Period of record: 1959 to 2010, 52 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 12.8 C (55.0 F) | -32.8 C (-27.0 F) | n/a | n/a |
| Feb | 17.8 C (64.0 F) | -29.4 C (-20.9 F) | n/a | n/a |
| Mar | 22.2 C (72.0 F) | -23.9 C (-11.0 F) | n/a | n/a |
| Apr | 31.1 C (88.0 F) | -15.6 C (3.9 F) | n/a | n/a |
| May | 36.1 C (97.0 F) | -7.2 C (19.0 F) | n/a | n/a |
| Jun | 36.1 C (97.0 F) | -3.9 C (25.0 F) | n/a | n/a |
| Jul | 38.9 C (102.0 F) | -3.3 C (26.1 F) | n/a | n/a |
| Aug | 42.2 C (108.0 F) | -2.2 C (28.0 F) | n/a | n/a |
| Sep | 37.2 C (99.0 F) | -7.8 C (18.0 F) | n/a | n/a |
| Oct | 29.4 C (84.9 F) | -17.2 C (1.0 F) | n/a | n/a |
| Nov | 20.6 C (69.1 F) | -30.0 C (-22.0 F) | n/a | n/a |
| Dec | 12.8 C (55.0 F) | -33.3 C (-27.9 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1959 | 30 |
| 1960 | 30 |
| 1961 | 38 |
| 1962 | 48 |
| 1963 | 35 |
| 1964 | 34 |
| 1965 | 36 |
| 1966 | 36 |
| 1967 | 30 |
| 1968 | 33 |
| 1969 | 28 |
| 1970 | 37 |
| 1971 | 37 |
| 1972 | 52 |
| 1973 | 30 |
| 1974 | 40 |
| 1975 | 55 |
| 1976 | 29 |
| 1977 | 35 |
| 1978 | 18 |
| 1979 | 31 |
| 1980 | 31 |
| 1981 | 24 |
| 1982 | 26 |
| 1983 | 39 |
| 1984 | 27 |
| 1985 | 30 |
| 1986 | 22 |
| 1987 | 24 |
| 1988 | 20 |
| 1989 | 20 |
| 1990 | 19 |
| 1991 | 16 |
| 1992 | 4 |
| 1993 | 20 |
| 1994 | 27 |
| 1995 | 28 |
| 1996 | 40 |
| 1997 | 20 |
| 1998 | 26 |
| 1999 | 33 |
| 2000 | 20 |
| 2001 | 13 |
| 2002 | 36 |
| 2003 | 26 |
| 2004 | 9 |
| 2005 | 17 |
| 2006 | 31 |
| 2007 | 28 |
| 2008 | 21 |
| 2009 | 19 |
| 2010 | 6 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 1989-02-03 | Record low maximum temperature | Record low maximum temperature -20.6 C (-5.1 F) |
| 1994-11-01 | Record daily precipitation | Record daily precipitation 53.1 mm (2.1 in) |
| 1996-04-24 | Record daily precipitation | Record daily precipitation 58.4 mm (2.3 in) |
| 2008-12-28 | Record daily precipitation | Record daily precipitation 72.1 mm (2.8 in) |
Wettest Day of Each Month
Dec: 72.1 mm (2.8 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 64.0 mm (2.5 in) | 2 January 2009 |
| Feb | 52.6 mm (2.1 in) | 24 February 1999 |
| Mar | 55.4 mm (2.2 in) | 28 March 2005 |
| Apr | 58.4 mm (2.3 in) | 24 April 1996 |
| May | 48.8 mm (1.9 in) | 30 May 1985 |
| Jun | 46.0 mm (1.8 in) | 15 June 1970 |
| Jul | 40.4 mm (1.6 in) | 1 July 1997 |
| Aug | 37.8 mm (1.5 in) | 24 August 1975 |
| Sep | 36.3 mm (1.4 in) | 11 September 1962 |
| Oct | 55.9 mm (2.2 in) | 1 October 2000 |
| Nov | 53.1 mm (2.1 in) | 1 November 1994 |
| Dec | 72.1 mm (2.8 in) | 28 December 2008 |
Period of Record Coverage
1959 to 2010| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1959 | 188 | 52% | No |
| 1960 | 333 | 91% | Yes |
| 1961 | 358 | 98% | Yes |
| 1962 | 354 | 97% | Yes |
| 1963 | 357 | 98% | Yes |
| 1964 | 365 | 100% | Yes |
| 1965 | 356 | 98% | Yes |
| 1966 | 358 | 98% | Yes |
| 1967 | 363 | 99% | Yes |
| 1968 | 365 | 100% | Yes |
| 1969 | 360 | 99% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 363 | 99% | Yes |
| 1972 | 357 | 98% | Yes |
| 1973 | 357 | 98% | Yes |
| 1974 | 363 | 99% | Yes |
| 1975 | 354 | 97% | Yes |
| 1976 | 360 | 98% | Yes |
| 1977 | 335 | 92% | Yes |
| 1978 | 256 | 70% | No |
| 1979 | 248 | 68% | No |
| 1980 | 296 | 81% | No |
| 1981 | 358 | 98% | Yes |
| 1982 | 278 | 76% | No |
| 1983 | 333 | 91% | Yes |
| 1984 | 245 | 67% | No |
| 1985 | 239 | 65% | No |
| 1986 | 247 | 68% | No |
| 1987 | 219 | 60% | No |
| 1988 | 247 | 67% | No |
| 1989 | 251 | 69% | No |
| 1990 | 248 | 68% | No |
| 1991 | 236 | 65% | No |
| 1992 | 53 | 14% | No |
| 1993 | 205 | 56% | No |
| 1994 | 364 | 100% | Yes |
| 1995 | 364 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 363 | 99% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 365 | 100% | Yes |
| 2001 | 364 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 218 | 60% | No |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 351 | 96% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 125 | 34% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 5 May 2010 | Headquarters, US | daily low min (Tie) | -4.4 C (24.1 F) | tie | 28 years | 3 of 100 (Routine) |
| 2 May 2010 | Headquarters, US | daily low max | 3.9 C (39.0 F) | 1.1 C (2.0 F) | 8 years | 8 of 100 (Routine) |
| 1 May 2010 | Headquarters, US | daily low max | 2.8 C (37.0 F) | 1.6 C (2.9 F) | 1 year | 7 of 100 (Routine) |
| 30 April 2010 | Headquarters, US | daily low max | 1.7 C (35.1 F) | 2.7 C (4.9 F) | 43 years | 21 of 100 (Routine) |
| 28 April 2010 | Headquarters, US | daily rain | 30.2 mm (1.2 in) | 2.5 mm (0.10 in) | 48 years | 23 of 100 (Routine) |
| 28 April 2010 | Headquarters, US | daily snowfall | 5.8 cm (2.3 in) | 3.3 cm (1.3 in) | 35 years | 23 of 100 (Routine) |
| 21 April 2010 | Headquarters, US | daily high max (Tie) | 25.0 C (77.0 F) | tie | 16 years | 2 of 100 (Routine) |
| 20 April 2010 | Headquarters, US | daily high max | 24.4 C (75.9 F) | 1.6 C (2.9 F) | 48 years | 21 of 100 (Routine) |
| 17 April 2010 | Headquarters, US | daily high max | 23.9 C (75.0 F) | 0.6 C (1.1 F) | 16 years | 10 of 100 (Routine) |
| 6 April 2010 | Headquarters, US | daily snowfall | 3.8 cm (1.5 in) | 1.3 cm (0.5 in) | 9 years | 10 of 100 (Routine) |
| 30 March 2010 | Headquarters, US | daily rain | 31.2 mm (1.2 in) | 7.6 mm (0.30 in) | 27 years | 25 of 100 (Routine) |
| 29 March 2010 | Headquarters, US | daily rain | 28.4 mm (1.1 in) | 14.9 mm (0.6 in) | 43 years | 41 of 100 (Notable) |
| 17 March 2010 | Headquarters, US | daily high max | 17.2 C (63.0 F) | 1.1 C (2.0 F) | 37 years | 18 of 100 (Routine) |
| 16 December 2009 | Headquarters, US | daily rain | 19.1 mm (0.8 in) | 5.1 mm (0.20 in) | 10 years | 14 of 100 (Routine) |
| 10 December 2009 | Headquarters, US | daily low max (Tie) | -12.2 C (10.0 F) | tie | 36 years | 4 of 100 (Routine) |
| 14 November 2009 | Headquarters, US | daily snowfall (Tie) | 7.6 cm (3.0 in) | tie | 20 years | 2 of 100 (Routine) |
| 28 October 2009 | Headquarters, US | daily low max | 1.7 C (35.1 F) | 3.3 C (5.9 F) | 44 years | 23 of 100 (Routine) |
| 13 October 2009 | Headquarters, US | daily low min | -11.1 C (12.0 F) | 4.4 C (7.9 F) | 23 years | 24 of 100 (Routine) |
| 12 October 2009 | Headquarters, US | daily low min | -10.6 C (12.9 F) | 3.9 C (7.0 F) | 7 years | 18 of 100 (Routine) |
| 12 October 2009 | Headquarters, US | daily low max (Tie) | 5.0 C (41.0 F) | tie | 12 years | 2 of 100 (Routine) |
Climate Trend
34 complete years, 1960 to 2009| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1960 | 6.1 C | -0.20 C |
| 1961 | 6.5 C | +0.19 C |
| 1962 | 5.9 C | -0.46 C |
| 1963 | 6.3 C | -0.07 C |
| 1964 | 5.1 C | -1.20 C |
| 1965 | 6.6 C | +0.25 C |
| 1966 | 7.2 C | +0.87 C |
| 1967 | 6.9 C | +0.56 C |
| 1968 | 6.1 C | -0.19 C |
| 1969 | 5.9 C | -0.45 C |
| 1970 | 6.3 C | -0.03 C |
| 1971 | 5.2 C | -1.11 C |
| 1972 | 6.1 C | -0.28 C |
| 1973 | 6.6 C | +0.25 C |
| 1974 | 6.5 C | +0.15 C |
| 1975 | 5.2 C | -1.17 C |
| 1976 | 5.7 C | -0.62 C |
| 1980 | 6.7 C | +0.39 C |
| 1981 | 7.4 C | +1.08 C |
| 1983 | 6.8 C | +0.51 C |
| 1994 | 6.9 C | +0.56 C |
| 1995 | 6.4 C | +0.09 C |
| 1996 | 6.0 C | -0.29 C |
| 1997 | 6.5 C | +0.21 C |
| 1998 | 7.5 C | +1.21 C |
| 1999 | 6.4 C | +0.10 C |
| 2000 | 6.2 C | -0.18 C |
| 2001 | 6.5 C | +0.15 C |
| 2002 | 5.9 C | -0.47 C |
| 2003 | 6.9 C | +0.61 C |
| 2005 | 6.3 C | -0.06 C |
| 2006 | 6.7 C | +0.34 C |
| 2007 | 6.5 C | +0.12 C |
| 2009 | 5.3 C | -1.00 C |
The fitted trend in annual mean temperature here over 1960 to 2009 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.1 C (-0.1 to 0.2) per decade | 0.1 F (-0.1 to 0.3) per decade | 1960 to 2009 | 34 | Not clearly different from zero |
| Mean daily maximum | -0.19 C (-0.33 to -0.05) per decade | -0.3 F (-0.6 to -0.1) per decade | 1960 to 2009 | 34 | Fall |
| Mean daily minimum | 0.3 C (0.1 to 0.5) per decade | 0.5 F (0.3 to 0.8) per decade | 1960 to 2009 | 34 | 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
1959 to 2010| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 42.2 C (108.0 F) | 1961 | 35.9 C (96.5 F) | 52 |
| Coldest night (TNn) | -33.3 C (-27.9 F) | 1968 | -23.6 C (-10.5 F) | 52 |
| Wettest day (Rx1day) | 72.1 mm (2.8 in) | 2008 | 38.5 mm (1.5 in) | 52 |
| Wettest five days (Rx5day) | 129.4 mm (5.1 in) | 2003 | 80.8 mm (3.2 in) | 52 |
| Longest dry spell (CDD) | 79 days | 1967 | 32 days | 52 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1959 | 38.9 C (102.0 F) |
| 1960 | 37.8 C (100.0 F) |
| 1961 | 42.2 C (108.0 F) |
| 1962 | 36.1 C (97.0 F) |
| 1963 | 34.4 C (93.9 F) |
| 1964 | 36.1 C (97.0 F) |
| 1965 | 35.6 C (96.1 F) |
| 1966 | 36.7 C (98.1 F) |
| 1967 | 38.9 C (102.0 F) |
| 1968 | 35.0 C (95.0 F) |
| 1969 | 37.8 C (100.0 F) |
| 1970 | 36.7 C (98.1 F) |
| 1971 | 36.1 C (97.0 F) |
| 1972 | 35.6 C (96.1 F) |
| 1973 | 36.1 C (97.0 F) |
| 1974 | 36.1 C (97.0 F) |
| 1975 | 37.2 C (99.0 F) |
| 1976 | 35.0 C (95.0 F) |
| 1977 | 35.6 C (96.1 F) |
| 1978 | 34.4 C (93.9 F) |
| 1979 | 36.7 C (98.1 F) |
| 1980 | 36.7 C (98.1 F) |
| 1981 | 35.0 C (95.0 F) |
| 1982 | 34.4 C (93.9 F) |
| 1983 | 37.8 C (100.0 F) |
| 1984 | 37.2 C (99.0 F) |
| 1985 | 37.8 C (100.0 F) |
| 1986 | 36.7 C (98.1 F) |
| 1987 | 35.0 C (95.0 F) |
| 1988 | 37.2 C (99.0 F) |
| 1989 | 35.0 C (95.0 F) |
| 1990 | 36.1 C (97.0 F) |
| 1991 | 33.9 C (93.0 F) |
| 1992 | 21.1 C (70.0 F) |
| 1993 | 32.2 C (90.0 F) |
| 1994 | 36.1 C (97.0 F) |
| 1995 | 30.0 C (86.0 F) |
| 1996 | 34.4 C (93.9 F) |
| 1997 | 33.9 C (93.0 F) |
| 1998 | 36.1 C (97.0 F) |
| 1999 | 35.0 C (95.0 F) |
| 2000 | 34.4 C (93.9 F) |
| 2001 | 35.0 C (95.0 F) |
| 2002 | 36.7 C (98.1 F) |
| 2003 | 35.0 C (95.0 F) |
| 2004 | 32.8 C (91.0 F) |
| 2005 | 35.0 C (95.0 F) |
| 2006 | 35.0 C (95.0 F) |
| 2007 | 36.1 C (97.0 F) |
| 2008 | 36.7 C (98.1 F) |
| 2009 | 33.3 C (91.9 F) |
| 2010 | 25.0 C (77.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1959 | -20.6 C (-5.1 F) |
| 1960 | -26.7 C (-16.1 F) |
| 1961 | -24.4 C (-11.9 F) |
| 1962 | -32.8 C (-27.0 F) |
| 1963 | -28.9 C (-20.0 F) |
| 1964 | -32.2 C (-26.0 F) |
| 1965 | -19.4 C (-2.9 F) |
| 1966 | -21.1 C (-6.0 F) |
| 1967 | -20.6 C (-5.1 F) |
| 1968 | -33.3 C (-27.9 F) |
| 1969 | -21.1 C (-6.0 F) |
| 1970 | -18.9 C (-2.0 F) |
| 1971 | -21.1 C (-6.0 F) |
| 1972 | -25.6 C (-14.1 F) |
| 1973 | -21.7 C (-7.1 F) |
| 1974 | -26.7 C (-16.1 F) |
| 1975 | -23.3 C (-9.9 F) |
| 1976 | -24.4 C (-11.9 F) |
| 1977 | -21.1 C (-6.0 F) |
| 1978 | -24.4 C (-11.9 F) |
| 1979 | -31.7 C (-25.1 F) |
| 1980 | -25.6 C (-14.1 F) |
| 1981 | -23.3 C (-9.9 F) |
| 1982 | -25.0 C (-13.0 F) |
| 1983 | -30.6 C (-23.1 F) |
| 1984 | -24.4 C (-11.9 F) |
| 1985 | -30.0 C (-22.0 F) |
| 1986 | -17.8 C (0.0 F) |
| 1987 | -22.2 C (-8.0 F) |
| 1988 | -25.0 C (-13.0 F) |
| 1989 | -29.4 C (-20.9 F) |
| 1990 | -32.2 C (-26.0 F) |
| 1991 | -25.0 C (-13.0 F) |
| 1992 | -17.2 C (1.0 F) |
| 1993 | -20.6 C (-5.1 F) |
| 1994 | -20.0 C (-4.0 F) |
| 1995 | -21.7 C (-7.1 F) |
| 1996 | -28.3 C (-18.9 F) |
| 1997 | -22.8 C (-9.0 F) |
| 1998 | -25.0 C (-13.0 F) |
| 1999 | -13.9 C (7.0 F) |
| 2000 | -17.2 C (1.0 F) |
| 2001 | -17.8 C (0.0 F) |
| 2002 | -18.3 C (-0.9 F) |
| 2003 | -16.7 C (1.9 F) |
| 2004 | -25.0 C (-13.0 F) |
| 2005 | -22.2 C (-8.0 F) |
| 2006 | -25.0 C (-13.0 F) |
| 2007 | -26.7 C (-16.1 F) |
| 2008 | -23.3 C (-9.9 F) |
| 2009 | -23.9 C (-11.0 F) |
| 2010 | -13.9 C (7.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1959 | 38.1 mm (1.5 in) |
| 1960 | 34.8 mm (1.4 in) |
| 1961 | 42.2 mm (1.7 in) |
| 1962 | 49.0 mm (1.9 in) |
| 1963 | 33.5 mm (1.3 in) |
| 1964 | 50.8 mm (2.0 in) |
| 1965 | 43.4 mm (1.7 in) |
| 1966 | 48.3 mm (1.9 in) |
| 1967 | 36.6 mm (1.4 in) |
| 1968 | 42.4 mm (1.7 in) |
| 1969 | 37.6 mm (1.5 in) |
| 1970 | 46.0 mm (1.8 in) |
| 1971 | 45.5 mm (1.8 in) |
| 1972 | 39.4 mm (1.6 in) |
| 1973 | 29.0 mm (1.1 in) |
| 1974 | 36.8 mm (1.4 in) |
| 1975 | 38.6 mm (1.5 in) |
| 1976 | 38.4 mm (1.5 in) |
| 1977 | 50.8 mm (2.0 in) |
| 1978 | 28.7 mm (1.1 in) |
| 1979 | 33.5 mm (1.3 in) |
| 1980 | 27.2 mm (1.1 in) |
| 1981 | 39.9 mm (1.6 in) |
| 1982 | 27.7 mm (1.1 in) |
| 1983 | 35.8 mm (1.4 in) |
| 1984 | 25.4 mm (1.0 in) |
| 1985 | 48.8 mm (1.9 in) |
| 1986 | 22.6 mm (0.9 in) |
| 1987 | 33.0 mm (1.3 in) |
| 1988 | 21.3 mm (0.8 in) |
| 1989 | 35.6 mm (1.4 in) |
| 1990 | 27.9 mm (1.1 in) |
| 1991 | 26.7 mm (1.1 in) |
| 1992 | 10.4 mm (0.4 in) |
| 1993 | 23.4 mm (0.9 in) |
| 1994 | 53.1 mm (2.1 in) |
| 1995 | 37.3 mm (1.5 in) |
| 1996 | 58.4 mm (2.3 in) |
| 1997 | 40.4 mm (1.6 in) |
| 1998 | 39.4 mm (1.6 in) |
| 1999 | 52.6 mm (2.1 in) |
| 2000 | 55.9 mm (2.2 in) |
| 2001 | 39.4 mm (1.6 in) |
| 2002 | 29.2 mm (1.1 in) |
| 2003 | 47.0 mm (1.9 in) |
| 2004 | 35.1 mm (1.4 in) |
| 2005 | 55.4 mm (2.2 in) |
| 2006 | 46.0 mm (1.8 in) |
| 2007 | 48.0 mm (1.9 in) |
| 2008 | 72.1 mm (2.8 in) |
| 2009 | 64.0 mm (2.5 in) |
| 2010 | 31.2 mm (1.2 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1959 | 80.5 mm (3.2 in) |
| 1960 | 82.6 mm (3.3 in) |
| 1961 | 83.2 mm (3.3 in) |
| 1962 | 107.9 mm (4.2 in) |
| 1963 | 87.2 mm (3.4 in) |
| 1964 | 110.7 mm (4.4 in) |
| 1965 | 94.5 mm (3.7 in) |
| 1966 | 82.4 mm (3.2 in) |
| 1967 | 77.2 mm (3.0 in) |
| 1968 | 111.3 mm (4.4 in) |
| 1969 | 83.6 mm (3.3 in) |
| 1970 | 81.1 mm (3.2 in) |
| 1971 | 72.4 mm (2.9 in) |
| 1972 | 93.7 mm (3.7 in) |
| 1973 | 84.9 mm (3.3 in) |
| 1974 | 107.6 mm (4.2 in) |
| 1975 | 99.6 mm (3.9 in) |
| 1976 | 80.6 mm (3.2 in) |
| 1977 | 71.9 mm (2.8 in) |
| 1978 | 50.6 mm (2.0 in) |
| 1979 | 49.2 mm (1.9 in) |
| 1980 | 52.7 mm (2.1 in) |
| 1981 | 73.0 mm (2.9 in) |
| 1982 | 56.9 mm (2.2 in) |
| 1983 | 61.2 mm (2.4 in) |
| 1984 | 62.2 mm (2.4 in) |
| 1985 | 57.2 mm (2.3 in) |
| 1986 | 27.9 mm (1.1 in) |
| 1987 | 29.2 mm (1.1 in) |
| 1988 | 30.5 mm (1.2 in) |
| 1989 | 36.4 mm (1.4 in) |
| 1990 | 41.9 mm (1.6 in) |
| 1991 | 43.7 mm (1.7 in) |
| 1992 | 23.4 mm (0.9 in) |
| 1993 | 45.7 mm (1.8 in) |
| 1994 | 86.6 mm (3.4 in) |
| 1995 | 107.0 mm (4.2 in) |
| 1996 | 105.1 mm (4.1 in) |
| 1997 | 107.6 mm (4.2 in) |
| 1998 | 86.6 mm (3.4 in) |
| 1999 | 110.1 mm (4.3 in) |
| 2000 | 73.2 mm (2.9 in) |
| 2001 | 66.8 mm (2.6 in) |
| 2002 | 57.6 mm (2.3 in) |
| 2003 | 129.4 mm (5.1 in) |
| 2004 | 81.0 mm (3.2 in) |
| 2005 | 93.8 mm (3.7 in) |
| 2006 | 119.8 mm (4.7 in) |
| 2007 | 99.1 mm (3.9 in) |
| 2008 | 74.9 mm (2.9 in) |
| 2009 | 93.5 mm (3.7 in) |
| 2010 | 73.9 mm (2.9 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1959 | 42 days |
| 1960 | 30 days |
| 1961 | 68 days |
| 1962 | 21 days |
| 1963 | 43 days |
| 1964 | 14 days |
| 1965 | 14 days |
| 1966 | 34 days |
| 1967 | 79 days |
| 1968 | 24 days |
| 1969 | 43 days |
| 1970 | 31 days |
| 1971 | 42 days |
| 1972 | 15 days |
| 1973 | 67 days |
| 1974 | 39 days |
| 1975 | 18 days |
| 1976 | 22 days |
| 1977 | 30 days |
| 1978 | 35 days |
| 1979 | 34 days |
| 1980 | 33 days |
| 1981 | 42 days |
| 1982 | 13 days |
| 1983 | 15 days |
| 1984 | 32 days |
| 1985 | 35 days |
| 1986 | 46 days |
| 1987 | 32 days |
| 1988 | 32 days |
| 1989 | 22 days |
| 1990 | 21 days |
| 1991 | 35 days |
| 1992 | 11 days |
| 1993 | 15 days |
| 1994 | 25 days |
| 1995 | 20 days |
| 1996 | 24 days |
| 1997 | 22 days |
| 1998 | 41 days |
| 1999 | 37 days |
| 2000 | 37 days |
| 2001 | 42 days |
| 2002 | 23 days |
| 2003 | 34 days |
| 2004 | 30 days |
| 2005 | 38 days |
| 2006 | 32 days |
| 2007 | 31 days |
| 2008 | 40 days |
| 2009 | 17 days |
| 2010 | 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
34 years with a frostAcross 34 years with a frost, the median last spring frost at Headquarters falls on 8 June and the median first autumn frost on 8 September, which leaves a median of 95 days between them.
Fitted over all years, the growing season changes by +8.1 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1964 to 2009) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 8 June | n/a | 7 June | n/a | -2.4 days per decade |
| First autumn frost | 8 September | n/a | 9 September | n/a | +5.6 days per decade |
| Growing days | 95 days | n/a | 96 days | n/a | +8.1 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
35 years, 1960 to 2009A day with at least 43.0 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 74.5 mm (2.9 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 43.0 mm (1.7 in) | |
| 5 years | 51.6 mm (2.0 in) | |
| 10 years | 57.2 mm (2.3 in) | |
| 25 years | 64.2 mm (2.5 in) | |
| 50 years | 69.4 mm (2.7 in) | Longer than the 35 years of record |
| 100 years | 74.5 mm (2.9 in) | Longer than the 35 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, 35 years of values from 1960 to 2009.
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: 72.1 mm (2.8 in) in 2008; 64.0 mm (2.5 in) in 2009; 58.4 mm (2.3 in) in 1996.
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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).