Somerville Dam Weather Records (USC00418446)
Record envelope, standing records and threshold days for Somerville Dam (USC00418446), Texas, United States, with 64 years of record.
Key Facts for Somerville Dam
- Somerville Dam (USC00418446) is a weather station in Texas, United States at 30.34 latitude and -96.54 longitude, 80 m (263 ft) above sea level.
- The station reports from 1963 to 2026, 64 years of record.
- 1,464 records set at Somerville Dam still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Somerville Dam set a daily record precipitation of 63.5 mm (2.5 in) 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: Texas, United States, 30.34 latitude, -96.54 longitude.
- Elevation: 80 m (263 ft).
- Period of record: 1963 to 2026, 64 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
16 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 31.7 C (89.1 F) | -13.9 C (7.0 F) | 30.6 C (87.1 F) | -2.2 C (28.0 F) |
| Feb | 35.6 C (96.1 F) | -11.7 C (10.9 F) | 30.0 C (86.0 F) | 1.1 C (34.0 F) |
| Mar | 32.8 C (91.0 F) | -8.9 C (16.0 F) | 31.7 C (89.1 F) | 0.6 C (33.1 F) |
| Apr | 35.6 C (96.1 F) | -2.8 C (27.0 F) | 31.7 C (89.1 F) | 8.9 C (48.0 F) |
| May | 43.3 C (109.9 F) | -0.6 C (30.9 F) | 32.8 C (91.0 F) | 16.1 C (61.0 F) |
| Jun | 42.8 C (109.0 F) | 11.1 C (52.0 F) | 35.6 C (96.1 F) | 19.4 C (66.9 F) |
| Jul | 42.2 C (108.0 F) | 12.8 C (55.0 F) | 39.4 C (102.9 F) | 21.7 C (71.1 F) |
| Aug | 42.8 C (109.0 F) | 13.3 C (55.9 F) | 40.0 C (104.0 F) | 21.1 C (70.0 F) |
| Sep | 45.6 C (114.1 F) | 5.6 C (42.1 F) | 37.2 C (99.0 F) | 17.2 C (63.0 F) |
| Oct | 37.2 C (99.0 F) | -3.9 C (25.0 F) | 32.8 C (91.0 F) | 16.7 C (62.1 F) |
| Nov | 32.8 C (91.0 F) | -8.9 C (16.0 F) | n/a | n/a |
| Dec | 29.4 C (84.9 F) | -16.1 C (3.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1963 | 4 |
| 1965 | 8 |
| 1966 | 23 |
| 1967 | 34 |
| 1968 | 21 |
| 1969 | 19 |
| 1970 | 14 |
| 1971 | 25 |
| 1972 | 26 |
| 1973 | 20 |
| 1974 | 28 |
| 1975 | 13 |
| 1976 | 37 |
| 1977 | 17 |
| 1978 | 18 |
| 1979 | 19 |
| 1980 | 24 |
| 1981 | 20 |
| 1982 | 35 |
| 1983 | 27 |
| 1984 | 37 |
| 1985 | 23 |
| 1986 | 20 |
| 1987 | 13 |
| 1988 | 19 |
| 1989 | 45 |
| 1990 | 22 |
| 1991 | 16 |
| 1992 | 19 |
| 1993 | 14 |
| 1994 | 9 |
| 1995 | 12 |
| 1996 | 42 |
| 1997 | 21 |
| 1998 | 19 |
| 1999 | 21 |
| 2000 | 33 |
| 2001 | 11 |
| 2002 | 18 |
| 2003 | 25 |
| 2004 | 17 |
| 2005 | 32 |
| 2006 | 34 |
| 2007 | 14 |
| 2008 | 12 |
| 2009 | 43 |
| 2010 | 40 |
| 2011 | 70 |
| 2012 | 13 |
| 2013 | 15 |
| 2014 | 8 |
| 2015 | 18 |
| 2016 | 17 |
| 2017 | 23 |
| 2018 | 18 |
| 2019 | 45 |
| 2020 | 16 |
| 2021 | 12 |
| 2022 | 29 |
| 2023 | 45 |
| 2024 | 18 |
| 2025 | 28 |
| 2026 | 26 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 1996-05-30 | Record high maximum temperature | Record high maximum temperature 43.3 C (109.9 F) |
| 2000-09-05 | Record high maximum temperature | Record high maximum temperature 45.6 C (114.1 F) |
Wettest Day of Each Month
Oct: 387.4 mm (15.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 63.5 mm (2.5 in) | 20 January 1989 |
| Feb | 96.0 mm (3.8 in) | 21 February 2003 |
| Mar | 113.0 mm (4.4 in) | 29 March 2018 |
| Apr | 168.9 mm (6.6 in) | 13 April 1969 |
| May | 299.7 mm (11.8 in) | 27 May 2016 |
| Jun | 124.5 mm (4.9 in) | 24 June 1968 |
| Jul | 88.4 mm (3.5 in) | 9 July 1968 |
| Aug | 150.4 mm (5.9 in) | 27 August 2017 |
| Sep | 127.0 mm (5.0 in) | 13 September 1974 |
| Oct | 387.4 mm (15.3 in) | 17 October 1994 |
| Nov | 128.0 mm (5.0 in) | 17 November 2015 |
| Dec | 127.3 mm (5.0 in) | 13 December 2015 |
Period of Record Coverage
1963 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1963 | 170 | 47% | No |
| 1965 | 85 | 23% | No |
| 1966 | 330 | 90% | Yes |
| 1967 | 359 | 98% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 364 | 100% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 364 | 100% | Yes |
| 1974 | 364 | 100% | Yes |
| 1975 | 364 | 100% | Yes |
| 1976 | 365 | 100% | Yes |
| 1977 | 363 | 99% | Yes |
| 1978 | 354 | 97% | Yes |
| 1979 | 363 | 99% | Yes |
| 1980 | 365 | 100% | Yes |
| 1981 | 364 | 100% | Yes |
| 1982 | 362 | 99% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 364 | 99% | Yes |
| 1985 | 363 | 99% | Yes |
| 1986 | 362 | 99% | Yes |
| 1987 | 363 | 99% | Yes |
| 1988 | 362 | 99% | Yes |
| 1989 | 362 | 99% | Yes |
| 1990 | 363 | 99% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 364 | 100% | Yes |
| 1994 | 363 | 99% | Yes |
| 1995 | 334 | 92% | Yes |
| 1996 | 363 | 99% | Yes |
| 1997 | 356 | 98% | Yes |
| 1998 | 329 | 90% | Yes |
| 1999 | 326 | 89% | No |
| 2000 | 361 | 99% | Yes |
| 2001 | 329 | 90% | Yes |
| 2002 | 295 | 81% | No |
| 2003 | 358 | 98% | Yes |
| 2004 | 356 | 97% | Yes |
| 2005 | 360 | 99% | Yes |
| 2006 | 364 | 100% | Yes |
| 2007 | 364 | 100% | Yes |
| 2008 | 362 | 99% | Yes |
| 2009 | 364 | 100% | Yes |
| 2010 | 364 | 100% | Yes |
| 2011 | 347 | 95% | Yes |
| 2012 | 300 | 82% | No |
| 2013 | 357 | 98% | Yes |
| 2014 | 357 | 98% | Yes |
| 2015 | 364 | 100% | Yes |
| 2016 | 355 | 97% | Yes |
| 2017 | 271 | 74% | No |
| 2018 | 315 | 86% | No |
| 2019 | 327 | 90% | No |
| 2020 | 290 | 79% | No |
| 2021 | 289 | 79% | No |
| 2022 | 274 | 75% | No |
| 2023 | 255 | 70% | No |
| 2024 | 290 | 79% | No |
| 2025 | 270 | 74% | No |
| 2026 | 228 | 62% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 2 October 2026 | Somerville Dam, US | daily rain (Provisional) | 63.5 mm (2.5 in) | 47.5 mm (1.9 in) | 24 years | 31 of 100 (Routine) |
| 1 October 2026 | Somerville Dam, US | monthly high min (Tie, Provisional) | 25.0 C (77.0 F) | tie | 56 years | 8 of 100 (Routine) |
| 16 September 2026 | Somerville Dam, US | daily high min (Provisional) | 25.6 C (78.1 F) | 0.6 C (1.1 F) | 39 years | 18 of 100 (Routine) |
| 12 September 2026 | Somerville Dam, US | daily high min (Provisional) | 24.4 C (75.9 F) | 0.5 C (0.9 F) | 52 years | 22 of 100 (Routine) |
| 4 September 2026 | Somerville Dam, US | daily high min (Tie, Provisional) | 25.0 C (77.0 F) | tie | 56 years | 5 of 100 (Routine) |
| 26 August 2026 | Somerville Dam, US | daily high min (Tie, Provisional) | 25.0 C (77.0 F) | tie | 36 years | 4 of 100 (Routine) |
| 22 August 2026 | Somerville Dam, US | daily high max (Tie, Provisional) | 40.0 C (104.0 F) | tie | 15 years | 2 of 100 (Routine) |
| 29 July 2026 | Somerville Dam, US | daily high min | 26.7 C (80.1 F) | 1.1 C (2.0 F) | 56 years | 28 of 100 (Routine) |
| 30 June 2026 | Somerville Dam, US | daily high min (Tie) | 26.1 C (79.0 F) | tie | 41 years | 4 of 100 (Routine) |
| 21 June 2026 | Somerville Dam, US | daily high min (Tie) | 26.1 C (79.0 F) | tie | 3 years | 1 of 100 (Routine) |
| 15 June 2026 | Somerville Dam, US | daily rain | 97.8 mm (3.9 in) | 19.1 mm (0.8 in) | 23 years | 21 of 100 (Routine) |
| 2 June 2026 | Somerville Dam, US | daily high min (Tie) | 24.4 C (75.9 F) | tie | 35 years | 4 of 100 (Routine) |
| 18 May 2026 | Somerville Dam, US | daily high min (Tie) | 24.4 C (75.9 F) | tie | 0 years | 1 of 100 (Routine) |
| 7 May 2026 | Somerville Dam, US | daily low max (Tie) | 21.7 C (71.1 F) | tie | 39 years | 4 of 100 (Routine) |
| 5 May 2026 | Somerville Dam, US | daily high min | 22.8 C (73.0 F) | 0.6 C (1.1 F) | 19 years | 12 of 100 (Routine) |
| 28 April 2026 | Somerville Dam, US | daily high min | 23.3 C (73.9 F) | 0.5 C (0.9 F) | 56 years | 22 of 100 (Routine) |
| 27 April 2026 | Somerville Dam, US | monthly high min | 23.9 C (75.0 F) | 0.6 C (1.1 F) | 59 years | 34 of 100 (Routine) |
| 16 April 2026 | Somerville Dam, US | daily high max (Tie) | 31.1 C (88.0 F) | tie | 20 years | 3 of 100 (Routine) |
| 2 April 2026 | Somerville Dam, US | daily rain | 61.0 mm (2.4 in) | 50.6 mm (2.0 in) | 16 years | 39 of 100 (Notable) |
| 1 April 2026 | Somerville Dam, US | daily high max (Tie) | 30.0 C (86.0 F) | tie | 44 years | 4 of 100 (Routine) |
Climate Trend
44 complete years, 1966 to 2016| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1966 | 19.2 C | -0.37 C |
| 1967 | 19.8 C | +0.27 C |
| 1968 | 18.5 C | -1.07 C |
| 1969 | 19.5 C | -0.10 C |
| 1970 | 18.9 C | -0.68 C |
| 1971 | 19.8 C | +0.27 C |
| 1972 | 19.3 C | -0.31 C |
| 1973 | 19.1 C | -0.48 C |
| 1974 | 19.2 C | -0.40 C |
| 1975 | 19.1 C | -0.51 C |
| 1976 | 18.6 C | -0.97 C |
| 1977 | 20.0 C | +0.45 C |
| 1978 | 18.8 C | -0.74 C |
| 1979 | 18.4 C | -1.17 C |
| 1980 | 19.7 C | +0.17 C |
| 1981 | 19.9 C | +0.32 C |
| 1982 | 19.7 C | +0.16 C |
| 1983 | 18.6 C | -0.98 C |
| 1984 | 20.1 C | +0.54 C |
| 1985 | 19.9 C | +0.28 C |
| 1986 | 20.4 C | +0.81 C |
| 1987 | 19.5 C | -0.06 C |
| 1988 | 19.8 C | +0.19 C |
| 1989 | 19.1 C | -0.49 C |
| 1990 | 20.6 C | +1.04 C |
| 1991 | 19.7 C | +0.11 C |
| 1992 | 19.5 C | -0.06 C |
| 1993 | 19.1 C | -0.51 C |
| 1994 | 19.6 C | +0.05 C |
| 1996 | 19.8 C | +0.21 C |
| 1997 | 19.0 C | -0.58 C |
| 2000 | 19.9 C | +0.29 C |
| 2003 | 18.6 C | -1.00 C |
| 2004 | 20.6 C | +1.03 C |
| 2005 | 20.9 C | +1.32 C |
| 2006 | 20.9 C | +1.36 C |
| 2007 | 20.0 C | +0.38 C |
| 2008 | 19.7 C | +0.10 C |
| 2009 | 19.6 C | -0.01 C |
| 2010 | 18.3 C | -1.26 C |
| 2013 | 20.2 C | +0.61 C |
| 2014 | 19.6 C | -0.02 C |
| 2015 | 20.2 C | +0.65 C |
| 2016 | 20.7 C | +1.12 C |
The annual mean temperature here has risen by 0.18 C (0.05 to 0.30) per decade over 1966 to 2016. In Fahrenheit: 0.3 F (0.1 to 0.5) per decade. The slope is a straight line fitted to 44 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.18 C (0.05 to 0.30) per decade | 0.3 F (0.1 to 0.5) per decade | 1966 to 2016 | 44 | Rise |
| Mean daily maximum | 0.5 C (0.4 to 0.7) per decade | 0.9 F (0.7 to 1.2) per decade | 1966 to 2016 | 44 | Rise |
| Mean daily minimum | -0.17 C (-0.37 to 0.03) per decade | -0.3 F (-0.7 to 0.1) per decade | 1966 to 2016 | 44 | 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
1963 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 45.6 C (114.1 F) | 2000 | 39.4 C (102.9 F) | 63 |
| Coldest night (TNn) | -16.1 C (3.0 F) | 1989 | -7.8 C (18.0 F) | 63 |
| Wettest day (Rx1day) | 387.4 mm (15.3 in) | 1994 | 76.2 mm (3.0 in) | 63 |
| Wettest five days (Rx5day) | 431.7 mm (17.0 in) | 1994 | 119.2 mm (4.7 in) | 63 |
| Longest dry spell (CDD) | 56 days | 1993 | 29 days | 63 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1963 | 39.4 C (102.9 F) |
| 1965 | 31.7 C (89.1 F) |
| 1966 | 39.4 C (102.9 F) |
| 1967 | 38.9 C (102.0 F) |
| 1968 | 36.7 C (98.1 F) |
| 1969 | 40.6 C (105.1 F) |
| 1970 | 38.3 C (100.9 F) |
| 1971 | 38.3 C (100.9 F) |
| 1972 | 36.1 C (97.0 F) |
| 1973 | 37.8 C (100.0 F) |
| 1974 | 37.8 C (100.0 F) |
| 1975 | 36.1 C (97.0 F) |
| 1976 | 37.8 C (100.0 F) |
| 1977 | 38.3 C (100.9 F) |
| 1978 | 38.9 C (102.0 F) |
| 1979 | 36.1 C (97.0 F) |
| 1980 | 40.0 C (104.0 F) |
| 1981 | 37.8 C (100.0 F) |
| 1982 | 38.3 C (100.9 F) |
| 1983 | 36.1 C (97.0 F) |
| 1984 | 38.9 C (102.0 F) |
| 1985 | 40.0 C (104.0 F) |
| 1986 | 40.6 C (105.1 F) |
| 1987 | 37.8 C (100.0 F) |
| 1988 | 39.4 C (102.9 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 40.6 C (105.1 F) |
| 1991 | 36.1 C (97.0 F) |
| 1992 | 37.2 C (99.0 F) |
| 1993 | 37.8 C (100.0 F) |
| 1994 | 39.4 C (102.9 F) |
| 1995 | 40.0 C (104.0 F) |
| 1996 | 43.3 C (109.9 F) |
| 1997 | 38.3 C (100.9 F) |
| 1998 | 41.7 C (107.1 F) |
| 1999 | 41.1 C (106.0 F) |
| 2000 | 45.6 C (114.1 F) |
| 2001 | 40.0 C (104.0 F) |
| 2002 | 39.4 C (102.9 F) |
| 2003 | 41.1 C (106.0 F) |
| 2004 | 37.2 C (99.0 F) |
| 2005 | 41.1 C (106.0 F) |
| 2006 | 40.0 C (104.0 F) |
| 2007 | 40.0 C (104.0 F) |
| 2008 | 41.1 C (106.0 F) |
| 2009 | 42.8 C (109.0 F) |
| 2010 | 41.7 C (107.1 F) |
| 2011 | 42.8 C (109.0 F) |
| 2012 | 42.2 C (108.0 F) |
| 2013 | 42.2 C (108.0 F) |
| 2014 | 39.4 C (102.9 F) |
| 2015 | 41.7 C (107.1 F) |
| 2016 | 40.0 C (104.0 F) |
| 2017 | 41.7 C (107.1 F) |
| 2018 | 41.7 C (107.1 F) |
| 2019 | 41.1 C (106.0 F) |
| 2020 | 38.9 C (102.0 F) |
| 2021 | 37.2 C (99.0 F) |
| 2022 | 42.2 C (108.0 F) |
| 2023 | 42.2 C (108.0 F) |
| 2024 | 38.9 C (102.0 F) |
| 2025 | 37.8 C (100.0 F) |
| 2026 | 40.0 C (104.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1963 | -2.2 C (28.0 F) |
| 1965 | 1.7 C (35.1 F) |
| 1966 | -8.9 C (16.0 F) |
| 1967 | -6.7 C (19.9 F) |
| 1968 | -6.1 C (21.0 F) |
| 1969 | -7.8 C (18.0 F) |
| 1970 | -7.2 C (19.0 F) |
| 1971 | -7.8 C (18.0 F) |
| 1972 | -8.3 C (17.1 F) |
| 1973 | -11.7 C (10.9 F) |
| 1974 | -5.6 C (21.9 F) |
| 1975 | -6.7 C (19.9 F) |
| 1976 | -9.4 C (15.1 F) |
| 1977 | -10.0 C (14.0 F) |
| 1978 | -8.3 C (17.1 F) |
| 1979 | -10.0 C (14.0 F) |
| 1980 | -7.2 C (19.0 F) |
| 1981 | -8.3 C (17.1 F) |
| 1982 | -13.3 C (8.1 F) |
| 1983 | -12.8 C (9.0 F) |
| 1984 | -8.3 C (17.1 F) |
| 1985 | -9.4 C (15.1 F) |
| 1986 | -3.3 C (26.1 F) |
| 1987 | -4.4 C (24.1 F) |
| 1988 | -7.8 C (18.0 F) |
| 1989 | -16.1 C (3.0 F) |
| 1990 | -12.2 C (10.0 F) |
| 1991 | -6.1 C (21.0 F) |
| 1992 | -4.4 C (24.1 F) |
| 1993 | -7.8 C (18.0 F) |
| 1994 | -8.9 C (16.0 F) |
| 1995 | -7.2 C (19.0 F) |
| 1996 | -10.6 C (12.9 F) |
| 1997 | -5.6 C (21.9 F) |
| 1998 | -4.4 C (24.1 F) |
| 1999 | -6.1 C (21.0 F) |
| 2000 | -9.4 C (15.1 F) |
| 2001 | -7.2 C (19.0 F) |
| 2002 | -10.0 C (14.0 F) |
| 2003 | -7.8 C (18.0 F) |
| 2004 | -5.6 C (21.9 F) |
| 2005 | -5.6 C (21.9 F) |
| 2006 | -6.1 C (21.0 F) |
| 2007 | -7.2 C (19.0 F) |
| 2008 | -7.8 C (18.0 F) |
| 2009 | -8.9 C (16.0 F) |
| 2010 | -13.9 C (7.0 F) |
| 2011 | -11.7 C (10.9 F) |
| 2012 | -5.6 C (21.9 F) |
| 2013 | -4.4 C (24.1 F) |
| 2014 | -10.6 C (12.9 F) |
| 2015 | -7.2 C (19.0 F) |
| 2016 | -7.8 C (18.0 F) |
| 2017 | -11.1 C (12.0 F) |
| 2018 | -12.8 C (9.0 F) |
| 2019 | -7.8 C (18.0 F) |
| 2020 | -7.2 C (19.0 F) |
| 2021 | 0.0 C (32.0 F) |
| 2022 | -10.6 C (12.9 F) |
| 2023 | 0.0 C (32.0 F) |
| 2024 | -7.8 C (18.0 F) |
| 2025 | -6.7 C (19.9 F) |
| 2026 | -2.2 C (28.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1963 | 59.2 mm (2.3 in) |
| 1965 | 86.9 mm (3.4 in) |
| 1966 | 78.7 mm (3.1 in) |
| 1967 | 79.2 mm (3.1 in) |
| 1968 | 125.7 mm (4.9 in) |
| 1969 | 168.9 mm (6.6 in) |
| 1970 | 62.5 mm (2.5 in) |
| 1971 | 43.7 mm (1.7 in) |
| 1972 | 46.7 mm (1.8 in) |
| 1973 | 88.1 mm (3.5 in) |
| 1974 | 127.0 mm (5.0 in) |
| 1975 | 62.2 mm (2.4 in) |
| 1976 | 55.1 mm (2.2 in) |
| 1977 | 68.8 mm (2.7 in) |
| 1978 | 117.6 mm (4.6 in) |
| 1979 | 76.2 mm (3.0 in) |
| 1980 | 48.3 mm (1.9 in) |
| 1981 | 76.2 mm (3.0 in) |
| 1982 | 61.0 mm (2.4 in) |
| 1983 | 73.7 mm (2.9 in) |
| 1984 | 50.8 mm (2.0 in) |
| 1985 | 56.9 mm (2.2 in) |
| 1986 | 120.7 mm (4.8 in) |
| 1987 | 96.0 mm (3.8 in) |
| 1988 | 48.5 mm (1.9 in) |
| 1989 | 76.2 mm (3.0 in) |
| 1990 | 48.8 mm (1.9 in) |
| 1991 | 58.7 mm (2.3 in) |
| 1992 | 67.3 mm (2.6 in) |
| 1993 | 114.8 mm (4.5 in) |
| 1994 | 387.4 mm (15.3 in) |
| 1995 | 80.3 mm (3.2 in) |
| 1996 | 73.2 mm (2.9 in) |
| 1997 | 101.6 mm (4.0 in) |
| 1998 | 114.3 mm (4.5 in) |
| 1999 | 70.6 mm (2.8 in) |
| 2000 | 73.7 mm (2.9 in) |
| 2001 | 106.7 mm (4.2 in) |
| 2002 | 84.3 mm (3.3 in) |
| 2003 | 96.0 mm (3.8 in) |
| 2004 | 57.2 mm (2.3 in) |
| 2005 | 74.9 mm (2.9 in) |
| 2006 | 79.0 mm (3.1 in) |
| 2007 | 55.4 mm (2.2 in) |
| 2008 | 50.3 mm (2.0 in) |
| 2009 | 70.6 mm (2.8 in) |
| 2010 | 57.7 mm (2.3 in) |
| 2011 | 66.3 mm (2.6 in) |
| 2012 | 80.3 mm (3.2 in) |
| 2013 | 82.8 mm (3.3 in) |
| 2014 | 106.7 mm (4.2 in) |
| 2015 | 141.0 mm (5.6 in) |
| 2016 | 299.7 mm (11.8 in) |
| 2017 | 150.4 mm (5.9 in) |
| 2018 | 113.0 mm (4.4 in) |
| 2019 | 101.6 mm (4.0 in) |
| 2020 | 74.9 mm (2.9 in) |
| 2021 | 55.9 mm (2.2 in) |
| 2022 | 58.4 mm (2.3 in) |
| 2023 | 68.6 mm (2.7 in) |
| 2024 | 67.3 mm (2.6 in) |
| 2025 | 87.6 mm (3.4 in) |
| 2026 | 97.8 mm (3.9 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1963 | 61.0 mm (2.4 in) |
| 1965 | 96.3 mm (3.8 in) |
| 1966 | 107.1 mm (4.2 in) |
| 1967 | 91.7 mm (3.6 in) |
| 1968 | 183.9 mm (7.2 in) |
| 1969 | 218.4 mm (8.6 in) |
| 1970 | 96.0 mm (3.8 in) |
| 1971 | 88.6 mm (3.5 in) |
| 1972 | 78.7 mm (3.1 in) |
| 1973 | 166.8 mm (6.6 in) |
| 1974 | 190.5 mm (7.5 in) |
| 1975 | 110.8 mm (4.4 in) |
| 1976 | 105.6 mm (4.2 in) |
| 1977 | 148.6 mm (5.9 in) |
| 1978 | 134.1 mm (5.3 in) |
| 1979 | 104.9 mm (4.1 in) |
| 1980 | 92.8 mm (3.7 in) |
| 1981 | 122.5 mm (4.8 in) |
| 1982 | 83.3 mm (3.3 in) |
| 1983 | 144.3 mm (5.7 in) |
| 1984 | 113.8 mm (4.5 in) |
| 1985 | 77.5 mm (3.1 in) |
| 1986 | 173.5 mm (6.8 in) |
| 1987 | 132.9 mm (5.2 in) |
| 1988 | 49.0 mm (1.9 in) |
| 1989 | 105.7 mm (4.2 in) |
| 1990 | 65.1 mm (2.6 in) |
| 1991 | 131.8 mm (5.2 in) |
| 1992 | 117.9 mm (4.6 in) |
| 1993 | 150.9 mm (5.9 in) |
| 1994 | 431.7 mm (17.0 in) |
| 1995 | 132.7 mm (5.2 in) |
| 1996 | 141.9 mm (5.6 in) |
| 1997 | 172.4 mm (6.8 in) |
| 1998 | 178.6 mm (7.0 in) |
| 1999 | 96.1 mm (3.8 in) |
| 2000 | 151.0 mm (5.9 in) |
| 2001 | 143.0 mm (5.6 in) |
| 2002 | 125.5 mm (4.9 in) |
| 2003 | 140.0 mm (5.5 in) |
| 2004 | 152.2 mm (6.0 in) |
| 2005 | 78.0 mm (3.1 in) |
| 2006 | 123.8 mm (4.9 in) |
| 2007 | 119.2 mm (4.7 in) |
| 2008 | 92.4 mm (3.6 in) |
| 2009 | 128.5 mm (5.1 in) |
| 2010 | 86.1 mm (3.4 in) |
| 2011 | 70.2 mm (2.8 in) |
| 2012 | 96.6 mm (3.8 in) |
| 2013 | 101.9 mm (4.0 in) |
| 2014 | 163.9 mm (6.5 in) |
| 2015 | 203.5 mm (8.0 in) |
| 2016 | 317.2 mm (12.5 in) |
| 2017 | 354.9 mm (14.0 in) |
| 2018 | 142.5 mm (5.6 in) |
| 2019 | 152.4 mm (6.0 in) |
| 2020 | 113.7 mm (4.5 in) |
| 2021 | 99.1 mm (3.9 in) |
| 2022 | 53.6 mm (2.1 in) |
| 2023 | 32.3 mm (1.3 in) |
| 2024 | 88.2 mm (3.5 in) |
| 2025 | 132.4 mm (5.2 in) |
| 2026 | 118.6 mm (4.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1963 | 51 days |
| 1965 | 16 days |
| 1966 | 29 days |
| 1967 | 32 days |
| 1968 | 25 days |
| 1969 | 34 days |
| 1970 | 31 days |
| 1971 | 34 days |
| 1972 | 24 days |
| 1973 | 22 days |
| 1974 | 31 days |
| 1975 | 36 days |
| 1976 | 19 days |
| 1977 | 25 days |
| 1978 | 45 days |
| 1979 | 40 days |
| 1980 | 37 days |
| 1981 | 43 days |
| 1982 | 16 days |
| 1983 | 25 days |
| 1984 | 39 days |
| 1985 | 36 days |
| 1986 | 37 days |
| 1987 | 33 days |
| 1988 | 29 days |
| 1989 | 33 days |
| 1990 | 22 days |
| 1991 | 31 days |
| 1992 | 18 days |
| 1993 | 56 days |
| 1994 | 26 days |
| 1995 | 26 days |
| 1996 | 28 days |
| 1997 | 21 days |
| 1998 | 17 days |
| 1999 | 41 days |
| 2000 | 40 days |
| 2001 | 26 days |
| 2002 | 28 days |
| 2003 | 19 days |
| 2004 | 17 days |
| 2005 | 23 days |
| 2006 | 32 days |
| 2007 | 40 days |
| 2008 | 45 days |
| 2009 | 35 days |
| 2010 | 36 days |
| 2011 | 48 days |
| 2012 | 31 days |
| 2013 | 19 days |
| 2014 | 21 days |
| 2015 | 26 days |
| 2016 | 35 days |
| 2017 | 19 days |
| 2018 | 20 days |
| 2019 | 26 days |
| 2020 | 20 days |
| 2021 | 12 days |
| 2022 | 31 days |
| 2023 | 47 days |
| 2024 | 25 days |
| 2025 | 13 days |
| 2026 | 20 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
43 years with a frostAcross 43 years with a frost, the median last spring frost at Somerville Dam falls on 8 March and the median first autumn frost on 19 November, which leaves a median of 257 days between them.
Fitted over all years, the growing season changes by -3.1 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1980 to 2016) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 8 March | n/a | 8 March | n/a | +1.3 days per decade |
| First autumn frost | 19 November | n/a | 20 November | n/a | -1.8 days per decade |
| Growing days | 257 days | n/a | 259 days | n/a | -3.1 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
49 years, 1966 to 2016A day with at least 73.1 mm (2.9 in) of rain is expected about once in 2 years. A day with at least 345.2 mm (13.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 73.1 mm (2.9 in) | |
| 5 years | 106.8 mm (4.2 in) | |
| 10 years | 139.8 mm (5.5 in) | |
| 25 years | 199.5 mm (7.9 in) | |
| 50 years | 262.0 mm (10.3 in) | Longer than the 49 years of record |
| 100 years | 345.2 mm (13.6 in) | Longer than the 49 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, 49 years of values from 1966 to 2016.
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: 387.4 mm (15.3 in) in 1994; 299.7 mm (11.8 in) in 2016; 168.9 mm (6.6 in) in 1969.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Somerville Dam, at 1976. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1976 ran 0.3 C (0.5 F) higher than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1976 | +0.3 | +0.5 | possible | 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.
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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).