Guernsey Dam #2 Weather Records (USC00484126)
Record envelope, standing records and threshold days for Guernsey Dam #2 (USC00484126), Wyoming, United States, with 65 years of record.
Key Facts for Guernsey Dam #2
- Guernsey Dam #2 (USC00484126) is a weather station in Wyoming, United States at 42.29 latitude and -104.76 longitude, 1,327 m (4,355 ft) above sea level.
- The station reports from 1962 to 2026, 65 years of record.
- 1,464 records set at Guernsey Dam #2 still stand.
- Records are tracked for prcp: an element needs 30 years of data to be eligible.
- Guernsey Dam #2 set a daily record precipitation of 16.0 mm (0.6 in) on 1 October 2025.
About the Station
- Location: Wyoming, United States, 42.29 latitude, -104.76 longitude.
- Elevation: 1,327 m (4,355 ft).
- Period of record: 1962 to 2026, 65 years.
- Eligible elements: prcp.
Daily Record Envelope and 2026
61 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 19.4 C (66.9 F) | -34.4 C (-29.9 F) | 13.3 C (55.9 F) | -25.6 C (-14.1 F) |
| Feb | 21.1 C (70.0 F) | -28.3 C (-18.9 F) | 18.3 C (64.9 F) | -23.9 C (-11.0 F) |
| Mar | 28.3 C (82.9 F) | -25.0 C (-13.0 F) | 27.2 C (81.0 F) | -11.1 C (12.0 F) |
| Apr | 30.0 C (86.0 F) | -14.4 C (6.1 F) | 28.9 C (84.0 F) | -7.2 C (19.0 F) |
| May | 34.4 C (93.9 F) | -3.9 C (25.0 F) | 32.2 C (90.0 F) | 0.6 C (33.1 F) |
| Jun | 38.9 C (102.0 F) | -1.1 C (30.0 F) | 37.8 C (100.0 F) | 7.2 C (45.0 F) |
| Jul | 40.6 C (105.1 F) | 7.8 C (46.0 F) | 38.9 C (102.0 F) | 10.6 C (51.1 F) |
| Aug | 40.0 C (104.0 F) | 3.3 C (37.9 F) | 37.8 C (100.0 F) | 10.0 C (50.0 F) |
| Sep | 38.9 C (102.0 F) | -1.1 C (30.0 F) | 33.9 C (93.0 F) | 4.4 C (39.9 F) |
| Oct | 32.2 C (90.0 F) | -19.4 C (-2.9 F) | 31.7 C (89.1 F) | -7.8 C (18.0 F) |
| Nov | 26.1 C (79.0 F) | -25.6 C (-14.1 F) | 23.3 C (73.9 F) | -15.6 C (3.9 F) |
| Dec | 21.7 C (71.1 F) | -31.1 C (-24.0 F) | 20.6 C (69.1 F) | -15.6 C (3.9 F) |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1962 | 65 |
| 1963 | 116 |
| 1964 | 5 |
| 1965 | 4 |
| 1968 | 11 |
| 1970 | 46 |
| 1971 | 15 |
| 1973 | 10 |
| 1974 | 79 |
| 1978 | 27 |
| 1979 | 28 |
| 1980 | 3 |
| 2012 | 32 |
| 2013 | 65 |
| 2014 | 51 |
| 2015 | 58 |
| 2016 | 58 |
| 2017 | 13 |
| 2018 | 101 |
| 2019 | 121 |
| 2020 | 108 |
| 2021 | 122 |
| 2022 | 127 |
| 2023 | 42 |
| 2024 | 38 |
| 2025 | 119 |
Wettest Day of Each Month
Jun: 88.9 mm (3.5 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 11.7 mm (0.5 in) | 9 January 2023 |
| Feb | 19.1 mm (0.8 in) | 4 February 2015 |
| Mar | 36.1 mm (1.4 in) | 6 March 1990 |
| Apr | 56.1 mm (2.2 in) | 26 April 2016 |
| May | 63.5 mm (2.5 in) | 16 May 1991 |
| Jun | 88.9 mm (3.5 in) | 12 June 1970 |
| Jul | 64.3 mm (2.5 in) | 23 July 1983 |
| Aug | 34.0 mm (1.3 in) | 31 August 1963 |
| Sep | 41.7 mm (1.6 in) | 1 September 1963 |
| Oct | 29.7 mm (1.2 in) | 7 October 1970 |
| Nov | 18.0 mm (0.7 in) | 8 November 1983 |
| Dec | 14.5 mm (0.6 in) | 27 December 1987 |
Period of Record Coverage
1962 to 2025| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1962 | 192 | 53% | No |
| 1963 | 337 | 92% | Yes |
| 1964 | 22 | 6% | No |
| 1965 | 31 | 8% | No |
| 1968 | 31 | 8% | No |
| 1970 | 132 | 36% | No |
| 1971 | 38 | 10% | No |
| 1973 | 19 | 5% | No |
| 1974 | 257 | 70% | No |
| 1978 | 86 | 24% | No |
| 1979 | 80 | 22% | No |
| 1980 | 25 | 7% | No |
| 2012 | 66 | 18% | No |
| 2013 | 164 | 45% | No |
| 2014 | 144 | 39% | No |
| 2015 | 135 | 37% | No |
| 2016 | 136 | 37% | No |
| 2017 | 25 | 7% | No |
| 2018 | 303 | 83% | No |
| 2019 | 364 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 151 | 41% | No |
| 2024 | 243 | 66% | No |
| 2025 | 365 | 100% | Yes |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 1 October 2025 | Guernsey Dam #2, US | daily rain | 16.0 mm (0.6 in) | 14.2 mm (0.6 in) | 6 years | 20 of 100 (Routine) |
| 24 September 2025 | Guernsey Dam #2, US | daily rain | 24.4 mm (1.0 in) | 20.3 mm (0.8 in) | 7 years | 20 of 100 (Routine) |
| 23 September 2025 | Guernsey Dam #2, US | daily rain | 23.9 mm (0.9 in) | 22.9 mm (0.9 in) | 40 years | 20 of 100 (Routine) |
| 22 September 2025 | Guernsey Dam #2, US | daily rain | 24.4 mm (1.0 in) | 4.6 mm (0.18 in) | 40 years | 20 of 100 (Routine) |
| 20 September 2025 | Guernsey Dam #2, US | daily rain (Tie) | 6.4 mm (0.25 in) | tie | 6 years | 1 of 100 (Routine) |
| 18 September 2025 | Guernsey Dam #2, US | daily rain | 24.4 mm (1.0 in) | 18.8 mm (0.7 in) | 47 years | 20 of 100 (Routine) |
| 17 September 2025 | Guernsey Dam #2, US | daily rain | 24.4 mm (1.0 in) | 15.0 mm (0.6 in) | 54 years | 20 of 100 (Routine) |
| 29 August 2025 | Guernsey Dam #2, US | daily rain | 10.2 mm (0.4 in) | 4.4 mm (0.17 in) | 60 years | 20 of 100 (Routine) |
| 31 July 2025 | Guernsey Dam #2, US | daily rain | 13.2 mm (0.5 in) | 3.0 mm (0.12 in) | 40 years | 20 of 100 (Routine) |
| 18 July 2025 | Guernsey Dam #2, US | daily rain | 14.5 mm (0.6 in) | 9.9 mm (0.39 in) | 39 years | 20 of 100 (Routine) |
| 25 May 2025 | Guernsey Dam #2, US | daily rain | 19.3 mm (0.8 in) | 3.3 mm (0.13 in) | 2 years | 9 of 100 (Routine) |
| 25 May 2023 | Guernsey Dam #2, US | daily rain | 16.0 mm (0.6 in) | 3.3 mm (0.13 in) | 38 years | 20 of 100 (Routine) |
| 6 April 2023 | Guernsey Dam #2, US | daily rain | 9.1 mm (0.36 in) | 2.7 mm (0.11 in) | 46 years | 20 of 100 (Routine) |
| 5 April 2023 | Guernsey Dam #2, US | daily rain | 9.7 mm (0.38 in) | 0.3 mm (0.01 in) | 57 years | 20 of 100 (Routine) |
| 25 February 2023 | Guernsey Dam #2, US | daily rain | 10.7 mm (0.4 in) | 7.1 mm (0.28 in) | 0 years | 20 of 100 (Routine) |
| 1 February 2023 | Guernsey Dam #2, US | daily rain | 3.8 mm (0.15 in) | 3.0 mm (0.12 in) | 44 years | 20 of 100 (Routine) |
| 23 January 2023 | Guernsey Dam #2, US | daily rain | 2.5 mm (0.10 in) | 0.2 mm (0.01 in) | 44 years | 20 of 100 (Routine) |
| 13 January 2023 | Guernsey Dam #2, US | daily rain | 3.0 mm (0.12 in) | 2.5 mm (0.10 in) | 47 years | 20 of 100 (Routine) |
| 11 January 2023 | Guernsey Dam #2, US | daily rain | 3.3 mm (0.13 in) | 1.5 mm (0.06 in) | 51 years | 20 of 100 (Routine) |
| 9 January 2023 | Guernsey Dam #2, US | monthly rain | 11.7 mm (0.5 in) | 0.8 mm (0.03 in) | 47 years | 20 of 100 (Routine) |
Extremes by Year
1962 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.1 C (106.0 F) | 2026 | 38.3 C (100.9 F) | 27 |
| Coldest night (TNn) | -34.4 C (-29.9 F) | 1963 | -25.0 C (-13.0 F) | 27 |
| Wettest day (Rx1day) | 88.9 mm (3.5 in) | 1970 | 31.8 mm (1.3 in) | 45 |
| Wettest five days (Rx5day) | 111.5 mm (4.4 in) | 1970 | 49.8 mm (2.0 in) | 41 |
| Longest dry spell (CDD) | 61 days | 1964 | 32 days | 45 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1962 | 37.2 C (99.0 F) |
| 1963 | 39.4 C (102.9 F) |
| 1964 | 14.4 C (57.9 F) |
| 1965 | 36.1 C (97.0 F) |
| 1966 | n/a |
| 1967 | n/a |
| 1968 | 37.2 C (99.0 F) |
| 1969 | n/a |
| 1970 | 37.8 C (100.0 F) |
| 1971 | 17.8 C (64.0 F) |
| 1972 | n/a |
| 1973 | 19.4 C (66.9 F) |
| 1974 | 38.3 C (100.9 F) |
| 1975 | n/a |
| 1976 | n/a |
| 1977 | n/a |
| 1978 | 25.0 C (77.0 F) |
| 1979 | 40.0 C (104.0 F) |
| 1980 | 28.9 C (84.0 F) |
| 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 | n/a |
| 1991 | n/a |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 38.3 C (100.9 F) |
| 2014 | 38.9 C (102.0 F) |
| 2015 | 38.9 C (102.0 F) |
| 2016 | 40.6 C (105.1 F) |
| 2017 | 35.0 C (95.0 F) |
| 2018 | 38.3 C (100.9 F) |
| 2019 | 38.3 C (100.9 F) |
| 2020 | 38.9 C (102.0 F) |
| 2021 | 38.9 C (102.0 F) |
| 2022 | 38.9 C (102.0 F) |
| 2023 | 29.4 C (84.9 F) |
| 2024 | 38.9 C (102.0 F) |
| 2025 | 38.9 C (102.0 F) |
| 2026 | 41.1 C (106.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1962 | -25.6 C (-14.1 F) |
| 1963 | -34.4 C (-29.9 F) |
| 1964 | -25.0 C (-13.0 F) |
| 1965 | 12.2 C (54.0 F) |
| 1966 | n/a |
| 1967 | n/a |
| 1968 | 6.7 C (44.1 F) |
| 1969 | n/a |
| 1970 | -20.0 C (-4.0 F) |
| 1971 | -27.8 C (-18.0 F) |
| 1972 | n/a |
| 1973 | -19.4 C (-2.9 F) |
| 1974 | -30.0 C (-22.0 F) |
| 1975 | n/a |
| 1976 | n/a |
| 1977 | n/a |
| 1978 | -22.2 C (-8.0 F) |
| 1979 | -22.2 C (-8.0 F) |
| 1980 | -7.8 C (18.0 F) |
| 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 | n/a |
| 1991 | n/a |
| 2012 | -13.3 C (8.1 F) |
| 2013 | -24.4 C (-11.9 F) |
| 2014 | -28.3 C (-18.9 F) |
| 2015 | -30.6 C (-23.1 F) |
| 2016 | -31.1 C (-24.0 F) |
| 2017 | -25.6 C (-14.1 F) |
| 2018 | -27.2 C (-17.0 F) |
| 2019 | -25.0 C (-13.0 F) |
| 2020 | -23.9 C (-11.0 F) |
| 2021 | -26.7 C (-16.1 F) |
| 2022 | -28.9 C (-20.0 F) |
| 2023 | -31.7 C (-25.1 F) |
| 2024 | -11.1 C (12.0 F) |
| 2025 | -25.6 C (-14.1 F) |
| 2026 | -17.8 C (0.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1962 | 25.7 mm (1.0 in) |
| 1963 | 41.7 mm (1.6 in) |
| 1964 | 38.6 mm (1.5 in) |
| 1965 | 43.9 mm (1.7 in) |
| 1966 | 24.4 mm (1.0 in) |
| 1967 | 53.1 mm (2.1 in) |
| 1968 | 22.4 mm (0.9 in) |
| 1969 | 67.3 mm (2.6 in) |
| 1970 | 88.9 mm (3.5 in) |
| 1971 | 37.6 mm (1.5 in) |
| 1972 | 33.0 mm (1.3 in) |
| 1973 | 38.6 mm (1.5 in) |
| 1974 | 20.3 mm (0.8 in) |
| 1975 | 13.7 mm (0.5 in) |
| 1976 | 30.7 mm (1.2 in) |
| 1977 | 36.3 mm (1.4 in) |
| 1978 | 32.0 mm (1.3 in) |
| 1979 | 31.8 mm (1.3 in) |
| 1980 | 25.4 mm (1.0 in) |
| 1981 | 32.5 mm (1.3 in) |
| 1982 | 41.9 mm (1.6 in) |
| 1983 | 64.3 mm (2.5 in) |
| 1984 | 36.8 mm (1.4 in) |
| 1985 | 25.9 mm (1.0 in) |
| 1986 | 29.2 mm (1.1 in) |
| 1987 | 23.1 mm (0.9 in) |
| 1988 | 47.0 mm (1.9 in) |
| 1989 | 51.1 mm (2.0 in) |
| 1990 | 43.9 mm (1.7 in) |
| 1991 | 63.5 mm (2.5 in) |
| 2012 | 16.5 mm (0.6 in) |
| 2013 | 16.0 mm (0.6 in) |
| 2014 | 26.2 mm (1.0 in) |
| 2015 | 55.9 mm (2.2 in) |
| 2016 | 56.1 mm (2.2 in) |
| 2017 | 33.0 mm (1.3 in) |
| 2018 | 30.5 mm (1.2 in) |
| 2019 | 25.1 mm (1.0 in) |
| 2020 | 20.1 mm (0.8 in) |
| 2021 | 17.8 mm (0.7 in) |
| 2022 | 22.4 mm (0.9 in) |
| 2023 | 21.3 mm (0.8 in) |
| 2024 | 14.5 mm (0.6 in) |
| 2025 | 24.4 mm (1.0 in) |
| 2026 | 2.0 mm (0.08 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1962 | 43.7 mm (1.7 in) |
| 1963 | 75.7 mm (3.0 in) |
| 1964 | 50.8 mm (2.0 in) |
| 1965 | 64.7 mm (2.5 in) |
| 1966 | 32.0 mm (1.3 in) |
| 1967 | 63.3 mm (2.5 in) |
| 1968 | 48.4 mm (1.9 in) |
| 1969 | 84.3 mm (3.3 in) |
| 1970 | 111.5 mm (4.4 in) |
| 1971 | 66.3 mm (2.6 in) |
| 1972 | 48.2 mm (1.9 in) |
| 1973 | 67.6 mm (2.7 in) |
| 1974 | 27.5 mm (1.1 in) |
| 1975 | 21.6 mm (0.9 in) |
| 1976 | 66.0 mm (2.6 in) |
| 1977 | 71.5 mm (2.8 in) |
| 1978 | 49.8 mm (2.0 in) |
| 1979 | 37.9 mm (1.5 in) |
| 1980 | 53.4 mm (2.1 in) |
| 1981 | 49.8 mm (2.0 in) |
| 1982 | 72.6 mm (2.9 in) |
| 1983 | 85.4 mm (3.4 in) |
| 1984 | 38.1 mm (1.5 in) |
| 1985 | 28.5 mm (1.1 in) |
| 1986 | 40.6 mm (1.6 in) |
| 1987 | 41.4 mm (1.6 in) |
| 1988 | 53.9 mm (2.1 in) |
| 1989 | 60.0 mm (2.4 in) |
| 1990 | 51.7 mm (2.0 in) |
| 1991 | 66.5 mm (2.6 in) |
| 2012 | 6.4 mm (0.25 in) |
| 2013 | 1.5 mm (0.06 in) |
| 2014 | n/a |
| 2015 | n/a |
| 2016 | n/a |
| 2017 | n/a |
| 2018 | 45.7 mm (1.8 in) |
| 2019 | 55.6 mm (2.2 in) |
| 2020 | 42.1 mm (1.7 in) |
| 2021 | 40.3 mm (1.6 in) |
| 2022 | 28.3 mm (1.1 in) |
| 2023 | 54.2 mm (2.1 in) |
| 2024 | 31.8 mm (1.3 in) |
| 2025 | 83.4 mm (3.3 in) |
| 2026 | 2.6 mm (0.10 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1962 | 38 days |
| 1963 | 57 days |
| 1964 | 61 days |
| 1965 | 51 days |
| 1966 | 46 days |
| 1967 | 28 days |
| 1968 | 53 days |
| 1969 | 42 days |
| 1970 | 46 days |
| 1971 | 44 days |
| 1972 | 21 days |
| 1973 | 32 days |
| 1974 | 33 days |
| 1975 | 26 days |
| 1976 | 31 days |
| 1977 | 40 days |
| 1978 | 31 days |
| 1979 | 26 days |
| 1980 | 30 days |
| 1981 | 36 days |
| 1982 | 28 days |
| 1983 | 29 days |
| 1984 | 36 days |
| 1985 | 25 days |
| 1986 | 30 days |
| 1987 | 28 days |
| 1988 | 48 days |
| 1989 | 32 days |
| 1990 | 43 days |
| 1991 | 30 days |
| 2012 | 24 days |
| 2013 | 28 days |
| 2014 | 4 days |
| 2015 | 4 days |
| 2016 | 3 days |
| 2017 | 3 days |
| 2018 | 33 days |
| 2019 | 28 days |
| 2020 | 48 days |
| 2021 | 33 days |
| 2022 | 54 days |
| 2023 | 22 days |
| 2024 | 54 days |
| 2025 | 37 days |
| 2026 | 52 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.
Rainfall Return Levels
32 years, 1963 to 2025A day with at least 32.5 mm (1.3 in) of rain is expected about once in 2 years. A day with at least 95.0 mm (3.7 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 32.5 mm (1.3 in) | |
| 5 years | 46.4 mm (1.8 in) | |
| 10 years | 56.6 mm (2.2 in) | |
| 25 years | 70.9 mm (2.8 in) | |
| 50 years | 82.5 mm (3.2 in) | Longer than the 32 years of record |
| 100 years | 95.0 mm (3.7 in) | Longer than the 32 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, 32 years of values from 1963 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: 88.9 mm (3.5 in) in 1970; 67.3 mm (2.6 in) in 1969; 64.3 mm (2.5 in) in 1983.
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 (2025-12-31).