Ben Lomond #4 Weather Records (USC00040673)
Record envelope, standing records and threshold days for Ben Lomond #4 (USC00040673), California, United States, with 55 years of record.
Key Facts for Ben Lomond #4
- Ben Lomond #4 (USC00040673) is a weather station in California, United States at 37.09 latitude and -122.08 longitude, 133 m (435 ft) above sea level.
- The station reports from 1972 to 2026, 55 years of record.
- 1,464 records set at Ben Lomond #4 still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Ben Lomond #4 tied a daily record high minimum temperature of 14.4 C (57.9 F) on 5 October 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: California, United States, 37.09 latitude, -122.08 longitude.
- Elevation: 133 m (435 ft).
- Period of record: 1972 to 2026, 55 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
7 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 30.6 C (87.1 F) | -6.7 C (19.9 F) | 27.8 C (82.0 F) | -0.6 C (30.9 F) |
| Feb | 32.8 C (91.0 F) | -6.7 C (19.9 F) | 30.6 C (87.1 F) | 0.6 C (33.1 F) |
| Mar | 37.2 C (99.0 F) | -3.9 C (25.0 F) | 37.2 C (99.0 F) | 3.3 C (37.9 F) |
| Apr | 37.8 C (100.0 F) | -3.9 C (25.0 F) | 31.1 C (88.0 F) | 2.2 C (36.0 F) |
| May | 41.1 C (106.0 F) | -1.1 C (30.0 F) | 31.7 C (89.1 F) | 5.6 C (42.1 F) |
| Jun | 45.0 C (113.0 F) | -0.6 C (30.9 F) | 35.6 C (96.1 F) | 5.6 C (42.1 F) |
| Jul | 44.4 C (111.9 F) | 4.4 C (39.9 F) | 37.2 C (99.0 F) | 8.9 C (48.0 F) |
| Aug | 45.0 C (113.0 F) | -0.6 C (30.9 F) | 36.7 C (98.1 F) | 8.9 C (48.0 F) |
| Sep | 49.4 C (120.9 F) | -2.2 C (28.0 F) | 38.3 C (100.9 F) | 6.7 C (44.1 F) |
| Oct | 44.4 C (111.9 F) | -2.8 C (27.0 F) | 40.0 C (104.0 F) | 6.1 C (43.0 F) |
| Nov | 35.6 C (96.1 F) | -3.9 C (25.0 F) | n/a | n/a |
| Dec | 29.4 C (84.9 F) | -9.4 C (15.1 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1972 | 10 |
| 1973 | 40 |
| 1974 | 32 |
| 1975 | 24 |
| 1976 | 37 |
| 1977 | 29 |
| 1978 | 21 |
| 1979 | 20 |
| 1980 | 20 |
| 1981 | 32 |
| 1982 | 26 |
| 1983 | 29 |
| 1984 | 21 |
| 1985 | 38 |
| 1986 | 19 |
| 1987 | 29 |
| 1988 | 20 |
| 1989 | 33 |
| 1990 | 29 |
| 1991 | 21 |
| 1992 | 17 |
| 1993 | 25 |
| 1994 | 17 |
| 1995 | 21 |
| 1996 | 44 |
| 1997 | 18 |
| 1998 | 27 |
| 1999 | 23 |
| 2000 | 29 |
| 2001 | 20 |
| 2002 | 29 |
| 2003 | 15 |
| 2004 | 23 |
| 2005 | 8 |
| 2006 | 27 |
| 2007 | 14 |
| 2008 | 21 |
| 2009 | 22 |
| 2010 | 23 |
| 2011 | 26 |
| 2012 | 36 |
| 2013 | 27 |
| 2014 | 56 |
| 2015 | 80 |
| 2016 | 34 |
| 2017 | 45 |
| 2018 | 25 |
| 2019 | 33 |
| 2020 | 35 |
| 2021 | 19 |
| 2022 | 30 |
| 2023 | 26 |
| 2024 | 6 |
| 2025 | 18 |
| 2026 | 15 |
All-Time Record Progression
4 new records| Date | Kind | Detail |
|---|---|---|
| 2017-08-04 | Record high minimum temperature | Record high minimum temperature 19.4 C (66.9 F) |
| 2017-09-01 | Record high maximum temperature | Record high maximum temperature 45.6 C (114.1 F) |
| 2017-09-02 | Record high maximum temperature | Record high maximum temperature 48.3 C (118.9 F) |
| 2020-09-06 | Record high maximum temperature | Record high maximum temperature 49.4 C (120.9 F) |
Wettest Day of Each Month
Jan: 291.3 mm (11.5 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 291.3 mm (11.5 in) | 4 January 1982 |
| Feb | 137.2 mm (5.4 in) | 17 February 1980 |
| Mar | 152.1 mm (6.0 in) | 10 March 2023 |
| Apr | 96.3 mm (3.8 in) | 11 April 2006 |
| May | 77.5 mm (3.1 in) | 16 May 1996 |
| Jun | 58.2 mm (2.3 in) | 4 June 2011 |
| Jul | 21.6 mm (0.9 in) | 8 July 1974 |
| Aug | 19.6 mm (0.8 in) | 15 August 1976 |
| Sep | 50.0 mm (2.0 in) | 19 September 1977 |
| Oct | 218.7 mm (8.6 in) | 13 October 2009 |
| Nov | 147.3 mm (5.8 in) | 18 November 1982 |
| Dec | 228.9 mm (9.0 in) | 13 December 2021 |
Period of Record Coverage
1972 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1972 | 30 | 8% | No |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 364 | 100% | Yes |
| 1980 | 337 | 92% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 364 | 100% | Yes |
| 1986 | 364 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 364 | 100% | Yes |
| 1990 | 364 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 364 | 100% | Yes |
| 1995 | 364 | 100% | Yes |
| 1996 | 365 | 100% | Yes |
| 1997 | 363 | 99% | Yes |
| 1998 | 364 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 334 | 92% | Yes |
| 2002 | 334 | 92% | Yes |
| 2003 | 332 | 91% | Yes |
| 2004 | 363 | 99% | Yes |
| 2005 | 364 | 100% | Yes |
| 2006 | 362 | 99% | Yes |
| 2007 | 358 | 98% | Yes |
| 2008 | 360 | 98% | Yes |
| 2009 | 338 | 93% | Yes |
| 2010 | 345 | 95% | Yes |
| 2011 | 343 | 94% | Yes |
| 2012 | 353 | 96% | Yes |
| 2013 | 365 | 100% | Yes |
| 2014 | 365 | 100% | Yes |
| 2015 | 365 | 100% | Yes |
| 2016 | 361 | 99% | 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 | 233 | 64% | No |
| 2025 | 330 | 90% | Yes |
| 2026 | 249 | 68% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 5 October 2026 | Ben Lomond #4, US | daily high min (Tie, Provisional) | 14.4 C (57.9 F) | tie | 36 years | 3 of 100 (Routine) |
| 4 September 2026 | Ben Lomond #4, US | daily rain (Provisional) | 0.8 mm (0.03 in) | 0.3 mm (0.01 in) | 40 years | 17 of 100 (Routine) |
| 28 August 2026 | Ben Lomond #4, US | daily high min (Provisional) | 14.4 C (57.9 F) | 0.5 C (0.9 F) | 7 years | 9 of 100 (Routine) |
| 22 July 2026 | Ben Lomond #4, US | daily rain (Tie) | 0.8 mm (0.03 in) | tie | 40 years | 4 of 100 (Routine) |
| 21 July 2026 | Ben Lomond #4, US | daily high min (Tie) | 15.6 C (60.1 F) | tie | 12 years | 2 of 100 (Routine) |
| 3 July 2026 | Ben Lomond #4, US | daily low max | 22.8 C (73.0 F) | 0.5 C (0.9 F) | 32 years | 15 of 100 (Routine) |
| 20 June 2026 | Ben Lomond #4, US | daily low max | 19.4 C (66.9 F) | 1.2 C (2.2 F) | 37 years | 18 of 100 (Routine) |
| 6 June 2026 | Ben Lomond #4, US | daily high min (Tie) | 13.3 C (55.9 F) | tie | 44 years | 4 of 100 (Routine) |
| 26 April 2026 | Ben Lomond #4, US | daily low max (Tie) | 13.9 C (57.0 F) | tie | 0 years | 1 of 100 (Routine) |
| 22 April 2026 | Ben Lomond #4, US | daily low max | 13.9 C (57.0 F) | 0.5 C (0.9 F) | 37 years | 16 of 100 (Routine) |
| 21 April 2026 | Ben Lomond #4, US | daily rain | 55.9 mm (2.2 in) | 35.3 mm (1.4 in) | 4 years | 29 of 100 (Routine) |
| 13 April 2026 | Ben Lomond #4, US | daily low max (Tie) | 14.4 C (57.9 F) | tie | 23 years | 2 of 100 (Routine) |
| 11 April 2026 | Ben Lomond #4, US | daily high min (Tie) | 11.1 C (52.0 F) | tie | 33 years | 3 of 100 (Routine) |
| 25 March 2026 | Ben Lomond #4, US | daily high max | 32.8 C (91.0 F) | 1.1 C (2.0 F) | 0 years | 7 of 100 (Routine) |
| 24 March 2026 | Ben Lomond #4, US | daily high max | 30.0 C (86.0 F) | 1.1 C (2.0 F) | 28 years | 15 of 100 (Routine) |
| 21 March 2026 | Ben Lomond #4, US | monthly high max (Tie) | 37.2 C (99.0 F) | tie | 0 years | 3 of 100 (Routine) |
| 20 March 2026 | Ben Lomond #4, US | daily high max | 36.7 C (98.1 F) | 7.8 C (14.0 F) | 21 years | 26 of 100 (Routine) |
| 19 March 2026 | Ben Lomond #4, US | monthly high max | 37.2 C (99.0 F) | 0.5 C (0.9 F) | 0 years | 15 of 100 (Routine) |
| 18 March 2026 | Ben Lomond #4, US | monthly high max | 36.7 C (98.1 F) | 2.3 C (4.1 F) | 7 years | 21 of 100 (Routine) |
| 18 March 2026 | Ben Lomond #4, US | daily high min (Tie) | 8.9 C (48.0 F) | tie | 48 years | 4 of 100 (Routine) |
Climate Trend
47 complete years, 1973 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1973 | 14.6 C | -0.57 C |
| 1974 | 14.6 C | -0.49 C |
| 1975 | 14.2 C | -0.95 C |
| 1976 | 15.1 C | -0.05 C |
| 1977 | 15.0 C | -0.09 C |
| 1978 | 15.1 C | -0.07 C |
| 1979 | 15.0 C | -0.10 C |
| 1981 | 15.1 C | +0.00 C |
| 1982 | 14.1 C | -1.00 C |
| 1983 | 15.1 C | -0.07 C |
| 1984 | 15.1 C | -0.06 C |
| 1985 | 14.4 C | -0.71 C |
| 1986 | 14.9 C | -0.19 C |
| 1987 | 14.7 C | -0.39 C |
| 1988 | 15.0 C | -0.16 C |
| 1989 | 14.6 C | -0.58 C |
| 1990 | 14.7 C | -0.40 C |
| 1991 | 14.4 C | -0.78 C |
| 1992 | 15.3 C | +0.21 C |
| 1993 | 14.7 C | -0.42 C |
| 1994 | 13.9 C | -1.27 C |
| 1995 | 15.1 C | +0.01 C |
| 1996 | 15.7 C | +0.60 C |
| 1997 | 15.8 C | +0.66 C |
| 1998 | 14.1 C | -1.05 C |
| 1999 | 14.1 C | -1.01 C |
| 2000 | 14.8 C | -0.31 C |
| 2004 | 15.1 C | -0.03 C |
| 2005 | 14.9 C | -0.25 C |
| 2006 | 14.6 C | -0.52 C |
| 2007 | 14.7 C | -0.45 C |
| 2008 | 14.9 C | -0.28 C |
| 2009 | 14.9 C | -0.26 C |
| 2010 | 14.2 C | -0.90 C |
| 2011 | 14.5 C | -0.64 C |
| 2012 | 16.3 C | +1.12 C |
| 2013 | 16.0 C | +0.86 C |
| 2014 | 16.3 C | +1.21 C |
| 2016 | 16.4 C | +1.31 C |
| 2017 | 16.6 C | +1.46 C |
| 2018 | 16.1 C | +0.97 C |
| 2019 | 16.0 C | +0.82 C |
| 2020 | 16.8 C | +1.62 C |
| 2021 | 15.9 C | +0.81 C |
| 2022 | 16.5 C | +1.37 C |
| 2023 | 15.7 C | +0.57 C |
| 2025 | 15.5 C | +0.38 C |
The annual mean temperature here has risen by 0.3 C (0.2 to 0.4) per decade over 1973 to 2025. In Fahrenheit: 0.5 F (0.3 to 0.7) per decade. The slope is a straight line fitted to 47 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 (0.2 to 0.4) per decade | 0.5 F (0.3 to 0.7) per decade | 1973 to 2025 | 47 | Rise |
| Mean daily maximum | 0.5 C (0.3 to 0.8) per decade | 1.0 F (0.6 to 1.4) per decade | 1973 to 2025 | 47 | Rise |
| Mean daily minimum | 0.04 C (-0.07 to 0.15) per decade | 0.1 F (-0.1 to 0.3) per decade | 1973 to 2025 | 47 | Not clearly different from zero |
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
1972 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 49.4 C (120.9 F) | 2020 | 41.1 C (106.0 F) | 55 |
| Coldest night (TNn) | -9.4 C (15.1 F) | 1990 | -3.9 C (25.0 F) | 55 |
| Wettest day (Rx1day) | 291.3 mm (11.5 in) | 1982 | 110.0 mm (4.3 in) | 55 |
| Wettest five days (Rx5day) | 450.6 mm (17.7 in) | 1982 | 212.6 mm (8.4 in) | 55 |
| Longest dry spell (CDD) | 218 days | 2018 | 104 days | 55 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1972 | 22.8 C (73.0 F) |
| 1973 | 42.2 C (108.0 F) |
| 1974 | 40.0 C (104.0 F) |
| 1975 | 40.6 C (105.1 F) |
| 1976 | 42.8 C (109.0 F) |
| 1977 | 41.1 C (106.0 F) |
| 1978 | 38.9 C (102.0 F) |
| 1979 | 40.6 C (105.1 F) |
| 1980 | 42.8 C (109.0 F) |
| 1981 | 41.7 C (107.1 F) |
| 1982 | 39.4 C (102.9 F) |
| 1983 | 40.6 C (105.1 F) |
| 1984 | 39.4 C (102.9 F) |
| 1985 | 41.1 C (106.0 F) |
| 1986 | 36.1 C (97.0 F) |
| 1987 | 41.1 C (106.0 F) |
| 1988 | 40.0 C (104.0 F) |
| 1989 | 42.2 C (108.0 F) |
| 1990 | 39.4 C (102.9 F) |
| 1991 | 37.2 C (99.0 F) |
| 1992 | 37.2 C (99.0 F) |
| 1993 | 41.1 C (106.0 F) |
| 1994 | 40.0 C (104.0 F) |
| 1995 | 40.0 C (104.0 F) |
| 1996 | 44.4 C (111.9 F) |
| 1997 | 43.3 C (109.9 F) |
| 1998 | 43.3 C (109.9 F) |
| 1999 | 40.0 C (104.0 F) |
| 2000 | 43.3 C (109.9 F) |
| 2001 | 41.7 C (107.1 F) |
| 2002 | 43.9 C (111.0 F) |
| 2003 | 40.0 C (104.0 F) |
| 2004 | 40.0 C (104.0 F) |
| 2005 | 38.9 C (102.0 F) |
| 2006 | 44.4 C (111.9 F) |
| 2007 | 39.4 C (102.9 F) |
| 2008 | 40.6 C (105.1 F) |
| 2009 | 41.7 C (107.1 F) |
| 2010 | 42.8 C (109.0 F) |
| 2011 | 38.9 C (102.0 F) |
| 2012 | 44.4 C (111.9 F) |
| 2013 | 42.8 C (109.0 F) |
| 2014 | 41.1 C (106.0 F) |
| 2015 | 43.9 C (111.0 F) |
| 2016 | 42.2 C (108.0 F) |
| 2017 | 48.3 C (118.9 F) |
| 2018 | 42.2 C (108.0 F) |
| 2019 | 41.7 C (107.1 F) |
| 2020 | 49.4 C (120.9 F) |
| 2021 | 45.0 C (113.0 F) |
| 2022 | 47.2 C (117.0 F) |
| 2023 | 40.0 C (104.0 F) |
| 2024 | 43.3 C (109.9 F) |
| 2025 | 39.4 C (102.9 F) |
| 2026 | 40.0 C (104.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1972 | -7.2 C (19.0 F) |
| 1973 | -5.6 C (21.9 F) |
| 1974 | -5.0 C (23.0 F) |
| 1975 | -5.0 C (23.0 F) |
| 1976 | -6.1 C (21.0 F) |
| 1977 | -2.8 C (27.0 F) |
| 1978 | -6.7 C (19.9 F) |
| 1979 | -5.0 C (23.0 F) |
| 1980 | -3.3 C (26.1 F) |
| 1981 | -1.7 C (28.9 F) |
| 1982 | -4.4 C (24.1 F) |
| 1983 | -1.7 C (28.9 F) |
| 1984 | -2.8 C (27.0 F) |
| 1985 | -5.0 C (23.0 F) |
| 1986 | -3.3 C (26.1 F) |
| 1987 | -4.4 C (24.1 F) |
| 1988 | -3.9 C (25.0 F) |
| 1989 | -6.7 C (19.9 F) |
| 1990 | -9.4 C (15.1 F) |
| 1991 | -3.3 C (26.1 F) |
| 1992 | -3.3 C (26.1 F) |
| 1993 | -3.9 C (25.0 F) |
| 1994 | -4.4 C (24.1 F) |
| 1995 | -2.8 C (27.0 F) |
| 1996 | -2.2 C (28.0 F) |
| 1997 | -5.6 C (21.9 F) |
| 1998 | -7.8 C (18.0 F) |
| 1999 | -3.9 C (25.0 F) |
| 2000 | -3.9 C (25.0 F) |
| 2001 | -5.6 C (21.9 F) |
| 2002 | -5.0 C (23.0 F) |
| 2003 | -3.9 C (25.0 F) |
| 2004 | -3.9 C (25.0 F) |
| 2005 | -2.8 C (27.0 F) |
| 2006 | -4.4 C (24.1 F) |
| 2007 | -6.7 C (19.9 F) |
| 2008 | -2.8 C (27.0 F) |
| 2009 | -4.4 C (24.1 F) |
| 2010 | -3.3 C (26.1 F) |
| 2011 | -5.0 C (23.0 F) |
| 2012 | -5.0 C (23.0 F) |
| 2013 | -6.7 C (19.9 F) |
| 2014 | -3.3 C (26.1 F) |
| 2015 | -5.0 C (23.0 F) |
| 2016 | -3.9 C (25.0 F) |
| 2017 | -3.9 C (25.0 F) |
| 2018 | -5.0 C (23.0 F) |
| 2019 | -3.9 C (25.0 F) |
| 2020 | -3.3 C (26.1 F) |
| 2021 | -2.2 C (28.0 F) |
| 2022 | -4.4 C (24.1 F) |
| 2023 | -4.4 C (24.1 F) |
| 2024 | -1.7 C (28.9 F) |
| 2025 | -2.8 C (27.0 F) |
| 2026 | -0.6 C (30.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1972 | 30.7 mm (1.2 in) |
| 1973 | 88.9 mm (3.5 in) |
| 1974 | 89.7 mm (3.5 in) |
| 1975 | 85.9 mm (3.4 in) |
| 1976 | 80.3 mm (3.2 in) |
| 1977 | 83.3 mm (3.3 in) |
| 1978 | 139.4 mm (5.5 in) |
| 1979 | 132.8 mm (5.2 in) |
| 1980 | 137.2 mm (5.4 in) |
| 1981 | 109.5 mm (4.3 in) |
| 1982 | 291.3 mm (11.5 in) |
| 1983 | 121.7 mm (4.8 in) |
| 1984 | 64.5 mm (2.5 in) |
| 1985 | 104.9 mm (4.1 in) |
| 1986 | 133.4 mm (5.3 in) |
| 1987 | 131.8 mm (5.2 in) |
| 1988 | 70.9 mm (2.8 in) |
| 1989 | 80.0 mm (3.1 in) |
| 1990 | 64.3 mm (2.5 in) |
| 1991 | 111.3 mm (4.4 in) |
| 1992 | 94.2 mm (3.7 in) |
| 1993 | 103.1 mm (4.1 in) |
| 1994 | 74.2 mm (2.9 in) |
| 1995 | 138.9 mm (5.5 in) |
| 1996 | 163.3 mm (6.4 in) |
| 1997 | 110.5 mm (4.4 in) |
| 1998 | 108.2 mm (4.3 in) |
| 1999 | 87.9 mm (3.5 in) |
| 2000 | 193.3 mm (7.6 in) |
| 2001 | 133.4 mm (5.3 in) |
| 2002 | 127.0 mm (5.0 in) |
| 2003 | 151.1 mm (5.9 in) |
| 2004 | 133.6 mm (5.3 in) |
| 2005 | 214.1 mm (8.4 in) |
| 2006 | 96.3 mm (3.8 in) |
| 2007 | 65.8 mm (2.6 in) |
| 2008 | 172.0 mm (6.8 in) |
| 2009 | 218.7 mm (8.6 in) |
| 2010 | 96.3 mm (3.8 in) |
| 2011 | 83.8 mm (3.3 in) |
| 2012 | 168.9 mm (6.6 in) |
| 2013 | 37.8 mm (1.5 in) |
| 2014 | 106.9 mm (4.2 in) |
| 2015 | 56.9 mm (2.2 in) |
| 2016 | 110.0 mm (4.3 in) |
| 2017 | 133.1 mm (5.2 in) |
| 2018 | 88.9 mm (3.5 in) |
| 2019 | 117.1 mm (4.6 in) |
| 2020 | 65.5 mm (2.6 in) |
| 2021 | 228.9 mm (9.0 in) |
| 2022 | 181.6 mm (7.1 in) |
| 2023 | 152.1 mm (6.0 in) |
| 2024 | 113.3 mm (4.5 in) |
| 2025 | 110.2 mm (4.3 in) |
| 2026 | 69.9 mm (2.8 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1972 | 57.9 mm (2.3 in) |
| 1973 | 164.8 mm (6.5 in) |
| 1974 | 212.6 mm (8.4 in) |
| 1975 | 152.1 mm (6.0 in) |
| 1976 | 122.2 mm (4.8 in) |
| 1977 | 156.7 mm (6.2 in) |
| 1978 | 343.5 mm (13.5 in) |
| 1979 | 188.6 mm (7.4 in) |
| 1980 | 424.3 mm (16.7 in) |
| 1981 | 218.5 mm (8.6 in) |
| 1982 | 450.6 mm (17.7 in) |
| 1983 | 275.3 mm (10.8 in) |
| 1984 | 134.2 mm (5.3 in) |
| 1985 | 134.9 mm (5.3 in) |
| 1986 | 391.0 mm (15.4 in) |
| 1987 | 210.8 mm (8.3 in) |
| 1988 | 175.9 mm (6.9 in) |
| 1989 | 101.8 mm (4.0 in) |
| 1990 | 103.4 mm (4.1 in) |
| 1991 | 243.9 mm (9.6 in) |
| 1992 | 259.0 mm (10.2 in) |
| 1993 | 190.5 mm (7.5 in) |
| 1994 | 173.3 mm (6.8 in) |
| 1995 | 275.6 mm (10.9 in) |
| 1996 | 252.1 mm (9.9 in) |
| 1997 | 330.0 mm (13.0 in) |
| 1998 | 289.9 mm (11.4 in) |
| 1999 | 204.5 mm (8.1 in) |
| 2000 | 314.5 mm (12.4 in) |
| 2001 | 323.3 mm (12.7 in) |
| 2002 | 421.4 mm (16.6 in) |
| 2003 | 164.6 mm (6.5 in) |
| 2004 | 273.6 mm (10.8 in) |
| 2005 | 361.4 mm (14.2 in) |
| 2006 | 199.4 mm (7.9 in) |
| 2007 | 162.6 mm (6.4 in) |
| 2008 | 239.0 mm (9.4 in) |
| 2009 | 259.6 mm (10.2 in) |
| 2010 | 222.4 mm (8.8 in) |
| 2011 | 210.0 mm (8.3 in) |
| 2012 | 318.5 mm (12.5 in) |
| 2013 | 45.7 mm (1.8 in) |
| 2014 | 228.9 mm (9.0 in) |
| 2015 | 111.1 mm (4.4 in) |
| 2016 | 203.5 mm (8.0 in) |
| 2017 | 305.8 mm (12.0 in) |
| 2018 | 163.5 mm (6.4 in) |
| 2019 | 260.1 mm (10.2 in) |
| 2020 | 83.5 mm (3.3 in) |
| 2021 | 350.6 mm (13.8 in) |
| 2022 | 330.4 mm (13.0 in) |
| 2023 | 283.7 mm (11.2 in) |
| 2024 | 187.5 mm (7.4 in) |
| 2025 | 196.9 mm (7.8 in) |
| 2026 | 198.6 mm (7.8 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1972 | 9 days |
| 1973 | 159 days |
| 1974 | 84 days |
| 1975 | 51 days |
| 1976 | 64 days |
| 1977 | 122 days |
| 1978 | 73 days |
| 1979 | 84 days |
| 1980 | 101 days |
| 1981 | 128 days |
| 1982 | 59 days |
| 1983 | 104 days |
| 1984 | 104 days |
| 1985 | 49 days |
| 1986 | 84 days |
| 1987 | 129 days |
| 1988 | 127 days |
| 1989 | 73 days |
| 1990 | 85 days |
| 1991 | 45 days |
| 1992 | 77 days |
| 1993 | 129 days |
| 1994 | 119 days |
| 1995 | 137 days |
| 1996 | 119 days |
| 1997 | 76 days |
| 1998 | 138 days |
| 1999 | 63 days |
| 2000 | 81 days |
| 2001 | 90 days |
| 2002 | 159 days |
| 2003 | 112 days |
| 2004 | 113 days |
| 2005 | 94 days |
| 2006 | 135 days |
| 2007 | 140 days |
| 2008 | 163 days |
| 2009 | 92 days |
| 2010 | 142 days |
| 2011 | 31 days |
| 2012 | 101 days |
| 2013 | 87 days |
| 2014 | 143 days |
| 2015 | 164 days |
| 2016 | 128 days |
| 2017 | 132 days |
| 2018 | 218 days |
| 2019 | 112 days |
| 2020 | 82 days |
| 2021 | 117 days |
| 2022 | 104 days |
| 2023 | 109 days |
| 2024 | 76 days |
| 2025 | 55 days |
| 2026 | 94 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
46 years with a frostAcross 46 years with a frost, the median last spring frost at Ben Lomond #4 falls on 24 March and the median first autumn frost on 11 November, which leaves a median of 236 days between them.
Fitted over all years, the growing season changes by -4.0 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1990 to 2023) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 24 March | n/a | 26 March | n/a | +2.4 days per decade |
| First autumn frost | 11 November | n/a | 11 November | n/a | -1.6 days per decade |
| Growing days | 236 days | n/a | 234 days | n/a | -4.0 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
51 years, 1973 to 2025A day with at least 110.1 mm (4.3 in) of rain is expected about once in 2 years. A day with at least 285.1 mm (11.2 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 110.1 mm (4.3 in) | |
| 5 years | 152.4 mm (6.0 in) | |
| 10 years | 182.1 mm (7.2 in) | |
| 25 years | 221.8 mm (8.7 in) | |
| 50 years | 252.9 mm (10.0 in) | |
| 100 years | 285.1 mm (11.2 in) | Longer than the 51 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, 51 years of values from 1973 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: 291.3 mm (11.5 in) in 1982; 228.9 mm (9.0 in) in 2021; 218.7 mm (8.6 in) in 2009.
Station Changes
2 suspected2 changes were suspected in the annual mean temperature of Ben Lomond #4, at 1981 and 2012. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1981 ran 0.5 C (0.8 F) lower than in the years before (possible change).
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2012 ran 0.3 C (0.6 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1981 | -0.4 | -0.8 | possible | 5 |
| 2012 | +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
2009 to 2025 against 1961 to 1990Over 2009 to 2025, Ben Lomond #4 had a mean temperature of 15.8 C (60.5 F) and 1,227.1 mm (48.3 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Surutato (Mexico, 1,860 km away), Cerocahui (Mexico, 1,708 km away) and Coimbra (Portugal, 9,083 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Surutato | Mexico | 1,860 km (1,156 mi) | 15.5 C (59.8 F) | 1,193.3 mm (47.0 in) | 0.76 |
| Cerocahui | Mexico | 1,708 km (1,061 mi) | 16.1 C (60.9 F) | 1,158.3 mm (45.6 in) | 1.03 |
| Coimbra | Portugal | 9,083 km (5,644 mi) | 15.6 C (60.2 F) | 984.2 mm (38.7 in) | 1.10 |
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).