Copper Bottom Weather Records (USS0012B16S)
Record envelope, standing records and threshold days for Copper Bottom (USS0012B16S), Montana, United States, with 48 years of record.
Key Facts for Copper Bottom
- Copper Bottom (USS0012B16S) is a weather station in Montana, United States at 47.06 latitude and -112.60 longitude, 1,585 m (5,200 ft) above sea level.
- The station reports from 1979 to 2026, 48 years of record.
- 1,464 records set at Copper Bottom still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Copper Bottom set a daily record precipitation of 20.3 mm (0.8 in) on 8 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Montana, United States, 47.06 latitude, -112.60 longitude.
- Elevation: 1,585 m (5,200 ft).
- Period of record: 1979 to 2026, 48 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
11 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 18.2 C (64.8 F) | -45.4 C (-49.7 F) | 15.2 C (59.4 F) | -18.2 C (-0.8 F) |
| Feb | 18.2 C (64.8 F) | -42.9 C (-45.2 F) | 18.2 C (64.8 F) | -22.5 C (-8.5 F) |
| Mar | 23.6 C (74.5 F) | -35.2 C (-31.4 F) | 18.9 C (66.0 F) | -20.7 C (-5.3 F) |
| Apr | 27.2 C (81.0 F) | -23.6 C (-10.5 F) | 25.0 C (77.0 F) | -6.8 C (19.8 F) |
| May | 30.4 C (86.7 F) | -12.7 C (9.1 F) | 27.9 C (82.2 F) | -4.6 C (23.7 F) |
| Jun | 34.4 C (93.9 F) | -4.2 C (24.4 F) | 24.9 C (76.8 F) | 0.4 C (32.7 F) |
| Jul | 38.5 C (101.3 F) | -2.8 C (27.0 F) | 34.1 C (93.4 F) | 3.7 C (38.7 F) |
| Aug | 40.2 C (104.4 F) | -5.9 C (21.4 F) | 33.7 C (92.7 F) | 0.2 C (32.4 F) |
| Sep | 37.0 C (98.6 F) | -10.4 C (13.3 F) | 29.9 C (85.8 F) | -3.9 C (25.0 F) |
| Oct | 33.3 C (91.9 F) | -25.3 C (-13.5 F) | 24.5 C (76.1 F) | -8.0 C (17.6 F) |
| Nov | 19.5 C (67.1 F) | -30.0 C (-22.0 F) | n/a | n/a |
| Dec | 13.3 C (55.9 F) | -40.9 C (-41.6 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1990 | 44 |
| 1991 | 55 |
| 1992 | 67 |
| 1993 | 62 |
| 1994 | 38 |
| 1995 | 56 |
| 1996 | 95 |
| 1997 | 38 |
| 1998 | 16 |
| 1999 | 21 |
| 2000 | 26 |
| 2001 | 18 |
| 2002 | 50 |
| 2003 | 45 |
| 2004 | 26 |
| 2005 | 41 |
| 2006 | 26 |
| 2007 | 32 |
| 2008 | 49 |
| 2009 | 44 |
| 2010 | 27 |
| 2011 | 33 |
| 2012 | 34 |
| 2013 | 41 |
| 2014 | 49 |
| 2015 | 34 |
| 2016 | 33 |
| 2017 | 30 |
| 2018 | 26 |
| 2019 | 33 |
| 2020 | 23 |
| 2021 | 45 |
| 2022 | 52 |
| 2023 | 42 |
| 2024 | 50 |
| 2025 | 30 |
| 2026 | 33 |
All-Time Record Progression
1 new records| Date | Kind | Detail |
|---|---|---|
| 2024-01-13 | Record low minimum temperature | Record low minimum temperature -45.4 C (-49.7 F) |
Wettest Day of Each Month
Nov: 58.4 mm (2.3 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 50.8 mm (2.0 in) | 31 January 2003 |
| Feb | 45.7 mm (1.8 in) | 23 February 2025 |
| Mar | 35.6 mm (1.4 in) | 19 March 2002 |
| Apr | 25.4 mm (1.0 in) | 10 April 1982 |
| May | 40.6 mm (1.6 in) | 9 May 1983 |
| Jun | 35.6 mm (1.4 in) | 12 June 1980 |
| Jul | 25.4 mm (1.0 in) | 4 July 1986 |
| Aug | 25.4 mm (1.0 in) | 23 August 1989 |
| Sep | 27.9 mm (1.1 in) | 12 September 1985 |
| Oct | 43.2 mm (1.7 in) | 16 October 1988 |
| Nov | 58.4 mm (2.3 in) | 12 November 2008 |
| Dec | 50.8 mm (2.0 in) | 10 December 2025 |
Period of Record Coverage
1990 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1990 | 171 | 47% | No |
| 1991 | 364 | 100% | Yes |
| 1992 | 365 | 100% | Yes |
| 1993 | 361 | 99% | 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 | 365 | 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 | 364 | 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 | 244 | 67% | No |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 364 | 100% | Yes |
| 2024 | 364 | 99% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 285 | 78% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 8 September 2026 | Copper Bottom, US | daily rain (Provisional) | 20.3 mm (0.8 in) | 2.5 mm (0.10 in) | 31 years | 18 of 100 (Routine) |
| 7 September 2026 | Copper Bottom, US | daily low max (Provisional) | 10.8 C (51.4 F) | 0.5 C (0.9 F) | 24 years | 10 of 100 (Routine) |
| 2 September 2026 | Copper Bottom, US | daily rain (Provisional) | 5.1 mm (0.20 in) | 2.6 mm (0.10 in) | 45 years | 20 of 100 (Routine) |
| 22 August 2026 | Copper Bottom, US | daily high min (Provisional) | 11.8 C (53.2 F) | 0.6 C (1.1 F) | 3 years | 4 of 100 (Routine) |
| 14 August 2026 | Copper Bottom, US | daily low max (Tie) | 17.0 C (62.6 F) | tie | 16 years | 1 of 100 (Routine) |
| 25 July 2026 | Copper Bottom, US | daily high max | 34.1 C (93.4 F) | 2.2 C (4.0 F) | 35 years | 17 of 100 (Routine) |
| 23 July 2026 | Copper Bottom, US | daily high min | 11.8 C (53.2 F) | 0.3 C (0.5 F) | 19 years | 9 of 100 (Routine) |
| 21 July 2026 | Copper Bottom, US | daily high min | 12.1 C (53.8 F) | 1.8 C (3.2 F) | 8 years | 11 of 100 (Routine) |
| 17 July 2026 | Copper Bottom, US | daily rain | 12.7 mm (0.5 in) | 7.6 mm (0.30 in) | 39 years | 20 of 100 (Routine) |
| 16 July 2026 | Copper Bottom, US | daily high min | 12.7 C (54.9 F) | 1.8 C (3.2 F) | 24 years | 16 of 100 (Routine) |
| 12 July 2026 | Copper Bottom, US | daily high min | 11.6 C (52.9 F) | 2.3 C (4.1 F) | 16 years | 14 of 100 (Routine) |
| 29 June 2026 | Copper Bottom, US | daily rain | 27.9 mm (1.1 in) | 10.1 mm (0.4 in) | 43 years | 35 of 100 (Notable) |
| 28 June 2026 | Copper Bottom, US | daily low max | 10.5 C (50.9 F) | 4.0 C (7.2 F) | 12 years | 13 of 100 (Routine) |
| 16 June 2026 | Copper Bottom, US | daily high min | 9.4 C (48.9 F) | 0.2 C (0.4 F) | 7 years | 5 of 100 (Routine) |
| 28 May 2026 | Copper Bottom, US | daily high min | 7.7 C (45.9 F) | 0.3 C (0.5 F) | 8 years | 5 of 100 (Routine) |
| 27 May 2026 | Copper Bottom, US | daily high max | 26.8 C (80.2 F) | 2.6 C (4.7 F) | 27 years | 15 of 100 (Routine) |
| 25 May 2026 | Copper Bottom, US | daily high max | 26.8 C (80.2 F) | 0.2 C (0.4 F) | 32 years | 12 of 100 (Routine) |
| 21 April 2026 | Copper Bottom, US | daily high max | 25.0 C (77.0 F) | 2.2 C (4.0 F) | 9 years | 9 of 100 (Routine) |
| 14 April 2026 | Copper Bottom, US | daily high min | 3.2 C (37.8 F) | 1.0 C (1.8 F) | 1 year | 5 of 100 (Routine) |
| 25 March 2026 | Copper Bottom, US | daily high min | 1.4 C (34.5 F) | 0.7 C (1.3 F) | 8 years | 6 of 100 (Routine) |
Climate Trend
33 complete years, 1991 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1991 | 6.2 C | +1.63 C |
| 1993 | 1.7 C | -2.89 C |
| 1994 | 3.4 C | -1.15 C |
| 1995 | 2.7 C | -1.87 C |
| 1996 | 1.9 C | -2.66 C |
| 1997 | 2.7 C | -1.92 C |
| 1998 | 4.4 C | -0.24 C |
| 1999 | 4.6 C | +0.00 C |
| 2000 | 4.1 C | -0.54 C |
| 2001 | 4.4 C | -0.19 C |
| 2002 | 3.2 C | -1.36 C |
| 2003 | 4.4 C | -0.18 C |
| 2004 | 5.1 C | +0.53 C |
| 2005 | 4.7 C | +0.09 C |
| 2006 | 5.1 C | +0.55 C |
| 2007 | 5.4 C | +0.80 C |
| 2008 | 4.1 C | -0.53 C |
| 2009 | 4.0 C | -0.57 C |
| 2010 | 4.7 C | +0.06 C |
| 2011 | 4.5 C | -0.12 C |
| 2012 | 5.7 C | +1.11 C |
| 2013 | 5.2 C | +0.60 C |
| 2014 | 4.8 C | +0.25 C |
| 2015 | 6.1 C | +1.46 C |
| 2016 | 5.8 C | +1.23 C |
| 2017 | 5.1 C | +0.55 C |
| 2018 | 4.7 C | +0.13 C |
| 2019 | 3.9 C | -0.65 C |
| 2021 | 5.5 C | +0.86 C |
| 2022 | 4.8 C | +0.22 C |
| 2023 | 5.6 C | +0.98 C |
| 2024 | 6.5 C | +1.90 C |
| 2025 | 6.4 C | +1.80 C |
The annual mean temperature here has risen by 0.8 C (0.4 to 1.1) per decade over 1991 to 2025. In Fahrenheit: 1.4 F (0.7 to 2.0) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.8 C (0.4 to 1.1) per decade | 1.4 F (0.7 to 2.0) per decade | 1991 to 2025 | 33 | Rise |
| Mean daily maximum | 0.5 C (0.1 to 0.9) per decade | 0.9 F (0.2 to 1.6) per decade | 1991 to 2025 | 33 | Rise |
| Mean daily minimum | 1.0 C (0.6 to 1.3) per decade | 1.8 F (1.2 to 2.4) per decade | 1991 to 2025 | 33 | 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
1979 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 40.2 C (104.4 F) | 1991 | 33.9 C (93.0 F) | 37 |
| Coldest night (TNn) | -45.4 C (-49.7 F) | 2024 | -35.2 C (-31.4 F) | 37 |
| Wettest day (Rx1day) | 58.4 mm (2.3 in) | 2008 | 31.8 mm (1.3 in) | 48 |
| Wettest five days (Rx5day) | 139.7 mm (5.5 in) | 2025 | 60.9 mm (2.4 in) | 48 |
| Longest dry spell (CDD) | 68 days | 1988 | 26 days | 48 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1979 | n/a |
| 1980 | n/a |
| 1981 | n/a |
| 1982 | n/a |
| 1983 | n/a |
| 1984 | n/a |
| 1985 | n/a |
| 1986 | n/a |
| 1987 | n/a |
| 1988 | n/a |
| 1989 | n/a |
| 1990 | 39.7 C (103.5 F) |
| 1991 | 40.2 C (104.4 F) |
| 1992 | 34.5 C (94.1 F) |
| 1993 | 32.5 C (90.5 F) |
| 1994 | 35.3 C (95.5 F) |
| 1995 | 32.8 C (91.0 F) |
| 1996 | 35.1 C (95.2 F) |
| 1997 | 32.4 C (90.3 F) |
| 1998 | 33.3 C (91.9 F) |
| 1999 | 33.6 C (92.5 F) |
| 2000 | 35.0 C (95.0 F) |
| 2001 | 33.9 C (93.0 F) |
| 2002 | 37.2 C (99.0 F) |
| 2003 | 34.2 C (93.6 F) |
| 2004 | 33.7 C (92.7 F) |
| 2005 | 32.0 C (89.6 F) |
| 2006 | 34.6 C (94.3 F) |
| 2007 | 35.4 C (95.7 F) |
| 2008 | 33.6 C (92.5 F) |
| 2009 | 31.7 C (89.1 F) |
| 2010 | 31.5 C (88.7 F) |
| 2011 | 32.3 C (90.1 F) |
| 2012 | 33.1 C (91.6 F) |
| 2013 | 34.6 C (94.3 F) |
| 2014 | 35.1 C (95.2 F) |
| 2015 | 33.5 C (92.3 F) |
| 2016 | 31.0 C (87.8 F) |
| 2017 | 33.1 C (91.6 F) |
| 2018 | 35.7 C (96.3 F) |
| 2019 | 31.9 C (89.4 F) |
| 2020 | 24.4 C (75.9 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 35.2 C (95.4 F) |
| 2023 | 33.3 C (91.9 F) |
| 2024 | 35.8 C (96.4 F) |
| 2025 | 34.0 C (93.2 F) |
| 2026 | 34.1 C (93.4 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1979 | n/a |
| 1980 | n/a |
| 1981 | n/a |
| 1982 | n/a |
| 1983 | n/a |
| 1984 | n/a |
| 1985 | n/a |
| 1986 | n/a |
| 1987 | n/a |
| 1988 | n/a |
| 1989 | n/a |
| 1990 | -37.0 C (-34.6 F) |
| 1991 | -30.0 C (-22.0 F) |
| 1992 | -30.1 C (-22.2 F) |
| 1993 | -35.2 C (-31.4 F) |
| 1994 | -37.3 C (-35.1 F) |
| 1995 | -32.1 C (-25.8 F) |
| 1996 | -36.8 C (-34.2 F) |
| 1997 | -33.4 C (-28.1 F) |
| 1998 | -35.2 C (-31.4 F) |
| 1999 | -25.0 C (-13.0 F) |
| 2000 | -30.3 C (-22.5 F) |
| 2001 | -28.1 C (-18.6 F) |
| 2002 | -31.8 C (-25.2 F) |
| 2003 | -34.5 C (-30.1 F) |
| 2004 | -42.0 C (-43.6 F) |
| 2005 | -35.5 C (-31.9 F) |
| 2006 | -42.9 C (-45.2 F) |
| 2007 | -37.8 C (-36.0 F) |
| 2008 | -38.8 C (-37.8 F) |
| 2009 | -37.0 C (-34.6 F) |
| 2010 | -34.5 C (-30.1 F) |
| 2011 | -36.8 C (-34.2 F) |
| 2012 | -24.9 C (-12.8 F) |
| 2013 | -32.6 C (-26.7 F) |
| 2014 | -39.1 C (-38.4 F) |
| 2015 | -23.0 C (-9.4 F) |
| 2016 | -36.8 C (-34.2 F) |
| 2017 | -32.8 C (-27.0 F) |
| 2018 | -34.3 C (-29.7 F) |
| 2019 | -35.2 C (-31.4 F) |
| 2020 | -24.5 C (-12.1 F) |
| 2021 | -35.5 C (-31.9 F) |
| 2022 | -40.9 C (-41.6 F) |
| 2023 | -33.9 C (-29.0 F) |
| 2024 | -45.4 C (-49.7 F) |
| 2025 | -36.4 C (-33.5 F) |
| 2026 | -22.5 C (-8.5 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1979 | 20.3 mm (0.8 in) |
| 1980 | 38.1 mm (1.5 in) |
| 1981 | 25.4 mm (1.0 in) |
| 1982 | 38.1 mm (1.5 in) |
| 1983 | 40.6 mm (1.6 in) |
| 1984 | 30.5 mm (1.2 in) |
| 1985 | 27.9 mm (1.1 in) |
| 1986 | 25.4 mm (1.0 in) |
| 1987 | 22.9 mm (0.9 in) |
| 1988 | 43.2 mm (1.7 in) |
| 1989 | 25.4 mm (1.0 in) |
| 1990 | 43.2 mm (1.7 in) |
| 1991 | 33.0 mm (1.3 in) |
| 1992 | 20.3 mm (0.8 in) |
| 1993 | 20.3 mm (0.8 in) |
| 1994 | 35.6 mm (1.4 in) |
| 1995 | 25.4 mm (1.0 in) |
| 1996 | 38.1 mm (1.5 in) |
| 1997 | 30.5 mm (1.2 in) |
| 1998 | 35.6 mm (1.4 in) |
| 1999 | 20.3 mm (0.8 in) |
| 2000 | 22.9 mm (0.9 in) |
| 2001 | 25.4 mm (1.0 in) |
| 2002 | 35.6 mm (1.4 in) |
| 2003 | 50.8 mm (2.0 in) |
| 2004 | 22.9 mm (0.9 in) |
| 2005 | 20.3 mm (0.8 in) |
| 2006 | 53.3 mm (2.1 in) |
| 2007 | 48.3 mm (1.9 in) |
| 2008 | 58.4 mm (2.3 in) |
| 2009 | 22.9 mm (0.9 in) |
| 2010 | 27.9 mm (1.1 in) |
| 2011 | 35.6 mm (1.4 in) |
| 2012 | 33.0 mm (1.3 in) |
| 2013 | 30.5 mm (1.2 in) |
| 2014 | 22.9 mm (0.9 in) |
| 2015 | 35.6 mm (1.4 in) |
| 2016 | 22.9 mm (0.9 in) |
| 2017 | 33.0 mm (1.3 in) |
| 2018 | 33.0 mm (1.3 in) |
| 2019 | 25.4 mm (1.0 in) |
| 2020 | 40.6 mm (1.6 in) |
| 2021 | 33.0 mm (1.3 in) |
| 2022 | 43.2 mm (1.7 in) |
| 2023 | 22.9 mm (0.9 in) |
| 2024 | 22.9 mm (0.9 in) |
| 2025 | 50.8 mm (2.0 in) |
| 2026 | 35.6 mm (1.4 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1979 | 38.1 mm (1.5 in) |
| 1980 | 66.1 mm (2.6 in) |
| 1981 | 63.5 mm (2.5 in) |
| 1982 | 71.1 mm (2.8 in) |
| 1983 | 73.6 mm (2.9 in) |
| 1984 | 45.7 mm (1.8 in) |
| 1985 | 50.8 mm (2.0 in) |
| 1986 | 53.3 mm (2.1 in) |
| 1987 | 45.8 mm (1.8 in) |
| 1988 | 60.9 mm (2.4 in) |
| 1989 | 55.8 mm (2.2 in) |
| 1990 | 71.1 mm (2.8 in) |
| 1991 | 60.8 mm (2.4 in) |
| 1992 | 55.8 mm (2.2 in) |
| 1993 | 38.1 mm (1.5 in) |
| 1994 | 68.6 mm (2.7 in) |
| 1995 | 83.8 mm (3.3 in) |
| 1996 | 101.6 mm (4.0 in) |
| 1997 | 104.2 mm (4.1 in) |
| 1998 | 114.4 mm (4.5 in) |
| 1999 | 55.9 mm (2.2 in) |
| 2000 | 33.0 mm (1.3 in) |
| 2001 | 40.7 mm (1.6 in) |
| 2002 | 71.2 mm (2.8 in) |
| 2003 | 91.4 mm (3.6 in) |
| 2004 | 45.7 mm (1.8 in) |
| 2005 | 35.5 mm (1.4 in) |
| 2006 | 86.3 mm (3.4 in) |
| 2007 | 66.1 mm (2.6 in) |
| 2008 | 60.9 mm (2.4 in) |
| 2009 | 58.4 mm (2.3 in) |
| 2010 | 45.7 mm (1.8 in) |
| 2011 | 71.1 mm (2.8 in) |
| 2012 | 68.6 mm (2.7 in) |
| 2013 | 40.6 mm (1.6 in) |
| 2014 | 58.4 mm (2.3 in) |
| 2015 | 66.1 mm (2.6 in) |
| 2016 | 50.9 mm (2.0 in) |
| 2017 | 55.9 mm (2.2 in) |
| 2018 | 63.4 mm (2.5 in) |
| 2019 | 38.1 mm (1.5 in) |
| 2020 | 93.9 mm (3.7 in) |
| 2021 | 94.0 mm (3.7 in) |
| 2022 | 73.7 mm (2.9 in) |
| 2023 | 27.9 mm (1.1 in) |
| 2024 | 43.2 mm (1.7 in) |
| 2025 | 139.7 mm (5.5 in) |
| 2026 | 94.0 mm (3.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1979 | 13 days |
| 1980 | 22 days |
| 1981 | 26 days |
| 1982 | 26 days |
| 1983 | 19 days |
| 1984 | 38 days |
| 1985 | 62 days |
| 1986 | 30 days |
| 1987 | 38 days |
| 1988 | 68 days |
| 1989 | 25 days |
| 1990 | 33 days |
| 1991 | 32 days |
| 1992 | 52 days |
| 1993 | 15 days |
| 1994 | 48 days |
| 1995 | 15 days |
| 1996 | 49 days |
| 1997 | 14 days |
| 1998 | 24 days |
| 1999 | 19 days |
| 2000 | 26 days |
| 2001 | 40 days |
| 2002 | 57 days |
| 2003 | 22 days |
| 2004 | 17 days |
| 2005 | 29 days |
| 2006 | 31 days |
| 2007 | 24 days |
| 2008 | 19 days |
| 2009 | 25 days |
| 2010 | 20 days |
| 2011 | 19 days |
| 2012 | 36 days |
| 2013 | 19 days |
| 2014 | 20 days |
| 2015 | 35 days |
| 2016 | 15 days |
| 2017 | 41 days |
| 2018 | 58 days |
| 2019 | 16 days |
| 2020 | 31 days |
| 2021 | 25 days |
| 2022 | 32 days |
| 2023 | 38 days |
| 2024 | 38 days |
| 2025 | 23 days |
| 2026 | 27 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
33 years with a frostAcross 33 years with a frost, the median last spring frost at Copper Bottom falls on 16 June and the median first autumn frost on 3 September, which leaves a median of 78 days between them.
Fitted over all years, the growing season changes by +28.4 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1995 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 16 June | n/a | 12 June | n/a | -8.6 days per decade |
| First autumn frost | 3 September | n/a | 3 September | n/a | +19.8 days per decade |
| Growing days | 78 days | n/a | 79 days | n/a | +28.4 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
46 years, 1980 to 2025A day with at least 30.6 mm (1.2 in) of rain is expected about once in 2 years. A day with at least 65.8 mm (2.6 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 30.6 mm (1.2 in) | |
| 5 years | 39.6 mm (1.6 in) | |
| 10 years | 45.7 mm (1.8 in) | |
| 25 years | 53.7 mm (2.1 in) | |
| 50 years | 59.7 mm (2.4 in) | Longer than the 46 years of record |
| 100 years | 65.8 mm (2.6 in) | Longer than the 46 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, 46 years of values from 1980 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: 58.4 mm (2.3 in) in 2008; 53.3 mm (2.1 in) in 2006; 50.8 mm (2.0 in) in 2003.
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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 (2026-10-17).