Boise Lucky Peak Dam Weather Records (USC00101018)
Record envelope, standing records and threshold days for Boise Lucky Peak Dam (USC00101018), Idaho, United States, with 76 years of record.
Key Facts for Boise Lucky Peak Dam
- Boise Lucky Peak Dam (USC00101018) is a weather station in Idaho, United States at 43.53 latitude and -116.05 longitude, 866 m (2,840 ft) above sea level.
- The station reports from 1951 to 2026, 76 years of record.
- 1,464 records set at Boise Lucky Peak Dam still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Boise Lucky Peak Dam tied a daily record high minimum temperature of 19.4 C (66.9 F) on 27 August 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Idaho, United States, 43.53 latitude, -116.05 longitude.
- Elevation: 866 m (2,840 ft).
- Period of record: 1951 to 2026, 76 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 | 19.4 C (66.9 F) | -26.7 C (-16.1 F) | 15.0 C (59.0 F) | -9.4 C (15.1 F) |
| Feb | 22.2 C (72.0 F) | -27.2 C (-17.0 F) | 16.7 C (62.1 F) | -5.0 C (23.0 F) |
| Mar | 28.9 C (84.0 F) | -13.9 C (7.0 F) | 28.9 C (84.0 F) | -5.6 C (21.9 F) |
| Apr | 33.9 C (93.0 F) | -8.3 C (17.1 F) | 28.3 C (82.9 F) | -1.7 C (28.9 F) |
| May | 39.4 C (102.9 F) | -6.7 C (19.9 F) | 36.1 C (97.0 F) | 2.2 C (36.0 F) |
| Jun | 43.3 C (109.9 F) | 0.0 C (32.0 F) | 34.4 C (93.9 F) | 4.4 C (39.9 F) |
| Jul | 45.0 C (113.0 F) | 4.4 C (39.9 F) | 40.6 C (105.1 F) | 12.8 C (55.0 F) |
| Aug | 42.8 C (109.0 F) | 1.7 C (35.1 F) | 38.3 C (100.9 F) | 7.8 C (46.0 F) |
| Sep | 40.6 C (105.1 F) | -3.3 C (26.1 F) | 25.0 C (77.0 F) | 7.2 C (45.0 F) |
| Oct | 35.0 C (95.0 F) | -12.2 C (10.0 F) | 28.9 C (84.0 F) | 11.1 C (52.0 F) |
| Nov | 26.7 C (80.1 F) | -19.4 C (-2.9 F) | n/a | n/a |
| Dec | 18.3 C (64.9 F) | -27.2 C (-17.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1951 | 11 |
| 1952 | 6 |
| 1953 | 24 |
| 1954 | 16 |
| 1955 | 6 |
| 1957 | 5 |
| 1958 | 32 |
| 1959 | 29 |
| 1960 | 22 |
| 1961 | 31 |
| 1962 | 23 |
| 1963 | 32 |
| 1964 | 19 |
| 1965 | 23 |
| 1966 | 28 |
| 1967 | 14 |
| 1968 | 16 |
| 1969 | 19 |
| 1970 | 29 |
| 1971 | 25 |
| 1972 | 33 |
| 1973 | 14 |
| 1974 | 25 |
| 1975 | 27 |
| 1976 | 13 |
| 1977 | 28 |
| 1978 | 18 |
| 1979 | 26 |
| 1980 | 18 |
| 1981 | 15 |
| 1982 | 5 |
| 1983 | 24 |
| 1984 | 19 |
| 1985 | 49 |
| 1986 | 31 |
| 1987 | 26 |
| 1988 | 22 |
| 1989 | 35 |
| 1990 | 20 |
| 1991 | 17 |
| 1992 | 14 |
| 1993 | 33 |
| 1994 | 15 |
| 1995 | 13 |
| 1996 | 18 |
| 1997 | 7 |
| 1998 | 11 |
| 1999 | 25 |
| 2000 | 7 |
| 2001 | 20 |
| 2002 | 18 |
| 2003 | 41 |
| 2004 | 8 |
| 2005 | 12 |
| 2006 | 9 |
| 2007 | 10 |
| 2008 | 7 |
| 2009 | 17 |
| 2010 | 9 |
| 2011 | 14 |
| 2012 | 16 |
| 2013 | 14 |
| 2014 | 31 |
| 2015 | 41 |
| 2016 | 15 |
| 2017 | 27 |
| 2018 | 14 |
| 2019 | 12 |
| 2020 | 18 |
| 2021 | 16 |
| 2022 | 19 |
| 2023 | 13 |
| 2024 | 13 |
| 2025 | 21 |
| 2026 | 11 |
All-Time Record Progression
9 new records| Date | Kind | Detail |
|---|---|---|
| 1989-02-05 | Record low maximum temperature | Record low maximum temperature -18.9 C (-2.0 F) |
| 1989-02-05 | Record low minimum temperature | Record low minimum temperature -27.2 C (-17.0 F) |
| 2002-07-12 | Record high maximum temperature | Record high maximum temperature 45.0 C (113.0 F) |
| 2003-07-24 | Record high minimum temperature | Record high minimum temperature 23.9 C (75.0 F) |
| 2010-05-27 | Record daily precipitation | Record daily precipitation 53.3 mm (2.1 in) |
| 2014-08-04 | Record high minimum temperature | Record high minimum temperature 25.0 C (77.0 F) |
| 2016-12-24 | Record snow depth | Record snow depth 22.9 cm (9.0 in) |
| 2023-03-01 | Record daily snowfall | Record daily snowfall 25.4 cm (10.0 in) |
| 2023-03-01 | Record snow depth | Record snow depth 25.4 cm (10.0 in) |
Wettest Day of Each Month
May: 53.3 mm (2.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 33.8 mm (1.3 in) | 11 January 1979 |
| Feb | 37.8 mm (1.5 in) | 2 February 2025 |
| Mar | 44.2 mm (1.7 in) | 30 March 2017 |
| Apr | 40.1 mm (1.6 in) | 7 April 1969 |
| May | 53.3 mm (2.1 in) | 27 May 2010 |
| Jun | 37.3 mm (1.5 in) | 11 June 1976 |
| Jul | 42.2 mm (1.7 in) | 31 July 2021 |
| Aug | 53.3 mm (2.1 in) | 26 August 2025 |
| Sep | 39.6 mm (1.6 in) | 12 September 1976 |
| Oct | 36.6 mm (1.4 in) | 24 October 2021 |
| Nov | 38.6 mm (1.5 in) | 15 November 2020 |
| Dec | 50.8 mm (2.0 in) | 21 December 2014 |
Period of Record Coverage
1951 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1951 | 281 | 77% | No |
| 1952 | 218 | 60% | No |
| 1953 | 287 | 79% | No |
| 1954 | 234 | 64% | No |
| 1955 | 101 | 28% | No |
| 1957 | 214 | 59% | No |
| 1958 | 361 | 99% | Yes |
| 1959 | 363 | 99% | Yes |
| 1960 | 364 | 99% | Yes |
| 1961 | 362 | 99% | Yes |
| 1962 | 364 | 100% | Yes |
| 1963 | 362 | 99% | Yes |
| 1964 | 316 | 86% | No |
| 1965 | 330 | 90% | Yes |
| 1966 | 313 | 86% | No |
| 1967 | 301 | 82% | No |
| 1968 | 312 | 85% | No |
| 1969 | 308 | 84% | No |
| 1970 | 344 | 94% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 364 | 100% | Yes |
| 1974 | 362 | 99% | Yes |
| 1975 | 363 | 99% | Yes |
| 1976 | 364 | 99% | Yes |
| 1977 | 362 | 99% | Yes |
| 1978 | 363 | 99% | Yes |
| 1979 | 336 | 92% | Yes |
| 1980 | 339 | 93% | Yes |
| 1981 | 355 | 97% | Yes |
| 1982 | 332 | 91% | Yes |
| 1983 | 343 | 94% | Yes |
| 1984 | 354 | 97% | Yes |
| 1985 | 324 | 89% | No |
| 1986 | 346 | 95% | Yes |
| 1987 | 361 | 99% | Yes |
| 1988 | 361 | 99% | Yes |
| 1989 | 317 | 87% | No |
| 1990 | 244 | 67% | No |
| 1991 | 248 | 68% | No |
| 1992 | 221 | 60% | No |
| 1993 | 253 | 69% | No |
| 1994 | 254 | 70% | No |
| 1995 | 251 | 69% | No |
| 1996 | 236 | 64% | No |
| 1997 | 235 | 64% | No |
| 1998 | 251 | 69% | No |
| 1999 | 263 | 72% | No |
| 2000 | 272 | 74% | No |
| 2001 | 241 | 66% | No |
| 2002 | 249 | 68% | No |
| 2003 | 270 | 74% | No |
| 2004 | 263 | 72% | No |
| 2005 | 262 | 72% | No |
| 2006 | 250 | 68% | No |
| 2007 | 220 | 60% | No |
| 2008 | 176 | 48% | No |
| 2009 | 328 | 90% | No |
| 2010 | 363 | 99% | Yes |
| 2011 | 314 | 86% | No |
| 2012 | 315 | 86% | No |
| 2013 | 334 | 92% | Yes |
| 2014 | 321 | 88% | No |
| 2015 | 364 | 100% | Yes |
| 2016 | 365 | 100% | Yes |
| 2017 | 365 | 100% | Yes |
| 2018 | 365 | 100% | Yes |
| 2019 | 357 | 98% | Yes |
| 2020 | 360 | 98% | Yes |
| 2021 | 364 | 100% | Yes |
| 2022 | 365 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 249 | 68% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 27 August 2026 | Boise Lucky Peak Dam, US | daily high min (Tie, Provisional) | 19.4 C (66.9 F) | tie | 15 years | 2 of 100 (Routine) |
| 26 August 2026 | Boise Lucky Peak Dam, US | daily high min (Tie, Provisional) | 20.0 C (68.0 F) | tie | 11 years | 2 of 100 (Routine) |
| 25 August 2026 | Boise Lucky Peak Dam, US | daily high min (Provisional) | 21.1 C (70.0 F) | 1.1 C (2.0 F) | 60 years | 27 of 100 (Routine) |
| 21 August 2026 | Boise Lucky Peak Dam, US | daily high min (Provisional) | 22.8 C (73.0 F) | 2.8 C (5.0 F) | 4 years | 15 of 100 (Routine) |
| 17 July 2026 | Boise Lucky Peak Dam, US | daily high min (Tie) | 22.2 C (72.0 F) | tie | 60 years | 6 of 100 (Routine) |
| 26 June 2026 | Boise Lucky Peak Dam, US | daily rain | 14.0 mm (0.6 in) | 0.5 mm (0.02 in) | 55 years | 20 of 100 (Routine) |
| 19 June 2026 | Boise Lucky Peak Dam, US | daily high min (Tie) | 18.3 C (64.9 F) | tie | 64 years | 6 of 100 (Routine) |
| 13 May 2026 | Boise Lucky Peak Dam, US | daily high max | 36.1 C (97.0 F) | 1.1 C (2.0 F) | 67 years | 28 of 100 (Routine) |
| 13 May 2026 | Boise Lucky Peak Dam, US | daily high min | 16.7 C (62.1 F) | 2.3 C (4.1 F) | 32 years | 21 of 100 (Routine) |
| 11 May 2026 | Boise Lucky Peak Dam, US | daily high max | 31.7 C (89.1 F) | 0.6 C (1.1 F) | 65 years | 27 of 100 (Routine) |
| 16 April 2026 | Boise Lucky Peak Dam, US | daily low max | 6.7 C (44.1 F) | 0.5 C (0.9 F) | 63 years | 25 of 100 (Routine) |
| 13 April 2026 | Boise Lucky Peak Dam, US | daily rain | 6.9 mm (0.27 in) | 0.5 mm (0.02 in) | 7 years | 9 of 100 (Routine) |
| 10 April 2026 | Boise Lucky Peak Dam, US | daily high min (Tie) | 10.0 C (50.0 F) | tie | 29 years | 3 of 100 (Routine) |
| 24 March 2026 | Boise Lucky Peak Dam, US | daily high max (Tie) | 25.0 C (77.0 F) | tie | 21 years | 3 of 100 (Routine) |
| 20 March 2026 | Boise Lucky Peak Dam, US | monthly high max | 28.9 C (84.0 F) | 1.1 C (2.0 F) | 0 years | 19 of 100 (Routine) |
| 19 March 2026 | Boise Lucky Peak Dam, US | monthly high max | 27.8 C (82.0 F) | 0.6 C (1.1 F) | 0 years | 18 of 100 (Routine) |
| 18 March 2026 | Boise Lucky Peak Dam, US | monthly high max (Tie) | 27.2 C (81.0 F) | tie | 0 years | 4 of 100 (Routine) |
| 17 March 2026 | Boise Lucky Peak Dam, US | daily high max | 23.3 C (73.9 F) | 3.3 C (5.9 F) | 53 years | 29 of 100 (Routine) |
| 12 March 2026 | Boise Lucky Peak Dam, US | daily high min | 7.8 C (46.0 F) | 1.7 C (3.1 F) | 53 years | 27 of 100 (Routine) |
| 4 March 2026 | Boise Lucky Peak Dam, US | daily rain | 27.9 mm (1.1 in) | 18.0 mm (0.7 in) | 16 years | 47 of 100 (Notable) |
Climate Trend
32 complete years, 1958 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1958 | 12.7 C | +1.30 C |
| 1959 | 11.4 C | 0.00 C |
| 1960 | 11.9 C | +0.44 C |
| 1961 | 12.6 C | +1.13 C |
| 1962 | 11.4 C | -0.01 C |
| 1963 | 12.2 C | +0.75 C |
| 1965 | 11.4 C | -0.07 C |
| 1971 | 10.5 C | -0.92 C |
| 1972 | 10.6 C | -0.86 C |
| 1973 | 11.4 C | -0.05 C |
| 1974 | 10.8 C | -0.58 C |
| 1975 | 9.9 C | -1.51 C |
| 1976 | 10.1 C | -1.30 C |
| 1977 | 10.3 C | -1.16 C |
| 1978 | 10.8 C | -0.66 C |
| 1981 | 11.6 C | +0.15 C |
| 1982 | 9.8 C | -1.58 C |
| 1986 | 11.8 C | +0.40 C |
| 1987 | 12.1 C | +0.65 C |
| 1988 | 10.8 C | -0.58 C |
| 2010 | 11.1 C | -0.29 C |
| 2015 | 13.1 C | +1.63 C |
| 2016 | 11.9 C | +0.52 C |
| 2017 | 11.4 C | 0.00 C |
| 2018 | 11.7 C | +0.25 C |
| 2019 | 11.1 C | -0.37 C |
| 2020 | 11.6 C | +0.19 C |
| 2021 | 12.4 C | +0.96 C |
| 2022 | 11.0 C | -0.44 C |
| 2023 | 11.5 C | +0.08 C |
| 2024 | 12.1 C | +0.64 C |
| 2025 | 12.8 C | +1.35 C |
The fitted trend in annual mean temperature here over 1958 to 2025 is 0.08 C (-0.04 to 0.20) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.4) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.08 C (-0.04 to 0.20) per decade | 0.1 F (-0.1 to 0.4) per decade | 1958 to 2025 | 32 | Not clearly different from zero |
| Mean daily maximum | 0.00 C (-0.15 to 0.14) per decade | 0.00 F (-0.26 to 0.26) per decade | 1958 to 2025 | 32 | Not clearly different from zero |
| Mean daily minimum | 0.16 C (0.04 to 0.28) per decade | 0.3 F (0.1 to 0.5) per decade | 1958 to 2025 | 32 | 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
1951 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 45.0 C (113.0 F) | 2002 | 40.6 C (105.1 F) | 75 |
| Coldest night (TNn) | -27.2 C (-17.0 F) | 1989 | -15.0 C (5.0 F) | 75 |
| Wettest day (Rx1day) | 53.3 mm (2.1 in) | 2010 | 25.4 mm (1.0 in) | 75 |
| Wettest five days (Rx5day) | 68.1 mm (2.7 in) | 1980 | 39.4 mm (1.6 in) | 75 |
| Longest dry spell (CDD) | 123 days | 1952 | 50 days | 75 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1951 | 41.1 C (106.0 F) |
| 1952 | 37.8 C (100.0 F) |
| 1953 | 41.1 C (106.0 F) |
| 1954 | 38.9 C (102.0 F) |
| 1955 | 26.7 C (80.1 F) |
| 1957 | 38.9 C (102.0 F) |
| 1958 | 38.9 C (102.0 F) |
| 1959 | 41.7 C (107.1 F) |
| 1960 | 44.4 C (111.9 F) |
| 1961 | 42.2 C (108.0 F) |
| 1962 | 40.0 C (104.0 F) |
| 1963 | 39.4 C (102.9 F) |
| 1964 | 39.4 C (102.9 F) |
| 1965 | 40.0 C (104.0 F) |
| 1966 | 41.1 C (106.0 F) |
| 1967 | 41.7 C (107.1 F) |
| 1968 | 42.2 C (108.0 F) |
| 1969 | 41.1 C (106.0 F) |
| 1970 | 41.1 C (106.0 F) |
| 1971 | 40.6 C (105.1 F) |
| 1972 | 38.9 C (102.0 F) |
| 1973 | 40.6 C (105.1 F) |
| 1974 | 40.0 C (104.0 F) |
| 1975 | 41.7 C (107.1 F) |
| 1976 | 39.4 C (102.9 F) |
| 1977 | 39.4 C (102.9 F) |
| 1978 | 41.1 C (106.0 F) |
| 1979 | 41.7 C (107.1 F) |
| 1980 | 41.7 C (107.1 F) |
| 1981 | 40.0 C (104.0 F) |
| 1982 | 36.7 C (98.1 F) |
| 1983 | 42.8 C (109.0 F) |
| 1984 | 39.4 C (102.9 F) |
| 1985 | 37.8 C (100.0 F) |
| 1986 | 40.6 C (105.1 F) |
| 1987 | 40.0 C (104.0 F) |
| 1988 | 40.0 C (104.0 F) |
| 1989 | 42.2 C (108.0 F) |
| 1990 | 41.7 C (107.1 F) |
| 1991 | 37.8 C (100.0 F) |
| 1992 | 40.6 C (105.1 F) |
| 1993 | 37.8 C (100.0 F) |
| 1994 | 40.0 C (104.0 F) |
| 1995 | 38.9 C (102.0 F) |
| 1996 | 39.4 C (102.9 F) |
| 1997 | 38.9 C (102.0 F) |
| 1998 | 42.8 C (109.0 F) |
| 1999 | 38.9 C (102.0 F) |
| 2000 | 40.0 C (104.0 F) |
| 2001 | 42.2 C (108.0 F) |
| 2002 | 45.0 C (113.0 F) |
| 2003 | 43.3 C (109.9 F) |
| 2004 | 40.0 C (104.0 F) |
| 2005 | 42.2 C (108.0 F) |
| 2006 | 41.1 C (106.0 F) |
| 2007 | 42.8 C (109.0 F) |
| 2008 | 41.1 C (106.0 F) |
| 2009 | 40.6 C (105.1 F) |
| 2010 | 38.9 C (102.0 F) |
| 2011 | 38.9 C (102.0 F) |
| 2012 | 41.1 C (106.0 F) |
| 2013 | 42.8 C (109.0 F) |
| 2014 | 40.0 C (104.0 F) |
| 2015 | 43.3 C (109.9 F) |
| 2016 | 38.3 C (100.9 F) |
| 2017 | 40.0 C (104.0 F) |
| 2018 | 42.8 C (109.0 F) |
| 2019 | 39.4 C (102.9 F) |
| 2020 | 41.7 C (107.1 F) |
| 2021 | 41.7 C (107.1 F) |
| 2022 | 40.6 C (105.1 F) |
| 2023 | 39.4 C (102.9 F) |
| 2024 | 41.7 C (107.1 F) |
| 2025 | 40.6 C (105.1 F) |
| 2026 | 40.6 C (105.1 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1951 | -18.9 C (-2.0 F) |
| 1952 | -14.4 C (6.1 F) |
| 1953 | -9.4 C (15.1 F) |
| 1954 | -11.1 C (12.0 F) |
| 1955 | -13.3 C (8.1 F) |
| 1957 | -10.0 C (14.0 F) |
| 1958 | -12.2 C (10.0 F) |
| 1959 | -17.8 C (0.0 F) |
| 1960 | -13.9 C (7.0 F) |
| 1961 | -15.0 C (5.0 F) |
| 1962 | -26.7 C (-16.1 F) |
| 1963 | -21.1 C (-6.0 F) |
| 1964 | -20.0 C (-4.0 F) |
| 1965 | -12.8 C (9.0 F) |
| 1966 | -14.4 C (6.1 F) |
| 1967 | -13.3 C (8.1 F) |
| 1968 | -11.1 C (12.0 F) |
| 1969 | -17.2 C (1.0 F) |
| 1970 | -12.8 C (9.0 F) |
| 1971 | -16.7 C (1.9 F) |
| 1972 | -25.0 C (-13.0 F) |
| 1973 | -10.6 C (12.9 F) |
| 1974 | -18.9 C (-2.0 F) |
| 1975 | -16.7 C (1.9 F) |
| 1976 | -17.2 C (1.0 F) |
| 1977 | -23.3 C (-9.9 F) |
| 1978 | -22.2 C (-8.0 F) |
| 1979 | -23.3 C (-9.9 F) |
| 1980 | -19.4 C (-2.9 F) |
| 1981 | -12.8 C (9.0 F) |
| 1982 | -18.9 C (-2.0 F) |
| 1983 | -22.8 C (-9.0 F) |
| 1984 | -20.6 C (-5.1 F) |
| 1985 | -24.4 C (-11.9 F) |
| 1986 | -15.0 C (5.0 F) |
| 1987 | -17.8 C (0.0 F) |
| 1988 | -20.6 C (-5.1 F) |
| 1989 | -27.2 C (-17.0 F) |
| 1990 | -27.2 C (-17.0 F) |
| 1991 | -22.8 C (-9.0 F) |
| 1992 | -12.8 C (9.0 F) |
| 1993 | -19.4 C (-2.9 F) |
| 1994 | -12.2 C (10.0 F) |
| 1995 | -11.7 C (10.9 F) |
| 1996 | -17.8 C (0.0 F) |
| 1997 | -15.0 C (5.0 F) |
| 1998 | -21.7 C (-7.1 F) |
| 1999 | -15.0 C (5.0 F) |
| 2000 | -11.7 C (10.9 F) |
| 2001 | -12.8 C (9.0 F) |
| 2002 | -12.2 C (10.0 F) |
| 2003 | -10.6 C (12.9 F) |
| 2004 | -19.4 C (-2.9 F) |
| 2005 | -13.9 C (7.0 F) |
| 2006 | -12.8 C (9.0 F) |
| 2007 | -16.1 C (3.0 F) |
| 2008 | -15.6 C (3.9 F) |
| 2009 | -21.1 C (-6.0 F) |
| 2010 | -13.9 C (7.0 F) |
| 2011 | -14.4 C (6.1 F) |
| 2012 | -11.1 C (12.0 F) |
| 2013 | -23.3 C (-9.9 F) |
| 2014 | -15.6 C (3.9 F) |
| 2015 | -12.8 C (9.0 F) |
| 2016 | -16.7 C (1.9 F) |
| 2017 | -22.8 C (-9.0 F) |
| 2018 | -15.0 C (5.0 F) |
| 2019 | -12.2 C (10.0 F) |
| 2020 | -11.1 C (12.0 F) |
| 2021 | -18.3 C (-0.9 F) |
| 2022 | -15.0 C (5.0 F) |
| 2023 | -13.9 C (7.0 F) |
| 2024 | -15.6 C (3.9 F) |
| 2025 | -15.0 C (5.0 F) |
| 2026 | -9.4 C (15.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1951 | 21.1 mm (0.8 in) |
| 1952 | 20.3 mm (0.8 in) |
| 1953 | 24.6 mm (1.0 in) |
| 1954 | 16.0 mm (0.6 in) |
| 1955 | 28.4 mm (1.1 in) |
| 1957 | 26.7 mm (1.1 in) |
| 1958 | 47.5 mm (1.9 in) |
| 1959 | 32.0 mm (1.3 in) |
| 1960 | 28.2 mm (1.1 in) |
| 1961 | 16.0 mm (0.6 in) |
| 1962 | 26.2 mm (1.0 in) |
| 1963 | 27.9 mm (1.1 in) |
| 1964 | 26.4 mm (1.0 in) |
| 1965 | 24.6 mm (1.0 in) |
| 1966 | 15.2 mm (0.6 in) |
| 1967 | 14.0 mm (0.6 in) |
| 1968 | 46.0 mm (1.8 in) |
| 1969 | 40.1 mm (1.6 in) |
| 1970 | 23.6 mm (0.9 in) |
| 1971 | 29.7 mm (1.2 in) |
| 1972 | 18.8 mm (0.7 in) |
| 1973 | 31.0 mm (1.2 in) |
| 1974 | 22.1 mm (0.9 in) |
| 1975 | 16.5 mm (0.6 in) |
| 1976 | 39.6 mm (1.6 in) |
| 1977 | 25.4 mm (1.0 in) |
| 1978 | 18.8 mm (0.7 in) |
| 1979 | 33.8 mm (1.3 in) |
| 1980 | 30.5 mm (1.2 in) |
| 1981 | 36.8 mm (1.4 in) |
| 1982 | 20.3 mm (0.8 in) |
| 1983 | 29.7 mm (1.2 in) |
| 1984 | 25.7 mm (1.0 in) |
| 1985 | 17.5 mm (0.7 in) |
| 1986 | 18.0 mm (0.7 in) |
| 1987 | 19.8 mm (0.8 in) |
| 1988 | 16.5 mm (0.6 in) |
| 1989 | 12.7 mm (0.5 in) |
| 1990 | 19.3 mm (0.8 in) |
| 1991 | 14.0 mm (0.6 in) |
| 1992 | 20.1 mm (0.8 in) |
| 1993 | 20.1 mm (0.8 in) |
| 1994 | 17.3 mm (0.7 in) |
| 1995 | 24.1 mm (0.9 in) |
| 1996 | 35.6 mm (1.4 in) |
| 1997 | 24.4 mm (1.0 in) |
| 1998 | 23.6 mm (0.9 in) |
| 1999 | 15.2 mm (0.6 in) |
| 2000 | 22.9 mm (0.9 in) |
| 2001 | 17.3 mm (0.7 in) |
| 2002 | 38.1 mm (1.5 in) |
| 2003 | 25.4 mm (1.0 in) |
| 2004 | 31.8 mm (1.3 in) |
| 2005 | 20.6 mm (0.8 in) |
| 2006 | 34.0 mm (1.3 in) |
| 2007 | 15.2 mm (0.6 in) |
| 2008 | 35.6 mm (1.4 in) |
| 2009 | 25.4 mm (1.0 in) |
| 2010 | 53.3 mm (2.1 in) |
| 2011 | 27.9 mm (1.1 in) |
| 2012 | 20.8 mm (0.8 in) |
| 2013 | 7.9 mm (0.31 in) |
| 2014 | 50.8 mm (2.0 in) |
| 2015 | 32.8 mm (1.3 in) |
| 2016 | 26.4 mm (1.0 in) |
| 2017 | 44.2 mm (1.7 in) |
| 2018 | 21.3 mm (0.8 in) |
| 2019 | 28.4 mm (1.1 in) |
| 2020 | 38.6 mm (1.5 in) |
| 2021 | 42.2 mm (1.7 in) |
| 2022 | 33.0 mm (1.3 in) |
| 2023 | 29.5 mm (1.2 in) |
| 2024 | 39.4 mm (1.6 in) |
| 2025 | 53.3 mm (2.1 in) |
| 2026 | 27.9 mm (1.1 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1951 | 42.4 mm (1.7 in) |
| 1952 | 24.8 mm (1.0 in) |
| 1953 | 35.8 mm (1.4 in) |
| 1954 | 23.6 mm (0.9 in) |
| 1955 | 50.7 mm (2.0 in) |
| 1957 | 35.3 mm (1.4 in) |
| 1958 | 53.6 mm (2.1 in) |
| 1959 | 32.0 mm (1.3 in) |
| 1960 | 47.0 mm (1.9 in) |
| 1961 | 33.5 mm (1.3 in) |
| 1962 | 44.8 mm (1.8 in) |
| 1963 | 56.9 mm (2.2 in) |
| 1964 | 55.4 mm (2.2 in) |
| 1965 | 59.6 mm (2.3 in) |
| 1966 | 28.4 mm (1.1 in) |
| 1967 | 18.8 mm (0.7 in) |
| 1968 | 57.7 mm (2.3 in) |
| 1969 | 52.9 mm (2.1 in) |
| 1970 | 32.8 mm (1.3 in) |
| 1971 | 40.9 mm (1.6 in) |
| 1972 | 42.9 mm (1.7 in) |
| 1973 | 38.8 mm (1.5 in) |
| 1974 | 31.7 mm (1.2 in) |
| 1975 | 25.9 mm (1.0 in) |
| 1976 | 44.7 mm (1.8 in) |
| 1977 | 39.7 mm (1.6 in) |
| 1978 | 28.8 mm (1.1 in) |
| 1979 | 44.4 mm (1.7 in) |
| 1980 | 68.1 mm (2.7 in) |
| 1981 | 45.2 mm (1.8 in) |
| 1982 | 41.9 mm (1.6 in) |
| 1983 | 35.6 mm (1.4 in) |
| 1984 | 39.9 mm (1.6 in) |
| 1985 | 39.4 mm (1.6 in) |
| 1986 | 26.6 mm (1.0 in) |
| 1987 | 21.3 mm (0.8 in) |
| 1988 | 25.9 mm (1.0 in) |
| 1989 | 14.5 mm (0.6 in) |
| 1990 | 46.2 mm (1.8 in) |
| 1991 | 16.8 mm (0.7 in) |
| 1992 | 34.1 mm (1.3 in) |
| 1993 | 46.8 mm (1.8 in) |
| 1994 | 15.5 mm (0.6 in) |
| 1995 | 33.1 mm (1.3 in) |
| 1996 | 28.5 mm (1.1 in) |
| 1997 | 24.7 mm (1.0 in) |
| 1998 | 38.6 mm (1.5 in) |
| 1999 | 19.1 mm (0.8 in) |
| 2000 | 30.5 mm (1.2 in) |
| 2001 | 22.1 mm (0.9 in) |
| 2002 | 40.0 mm (1.6 in) |
| 2003 | 39.2 mm (1.5 in) |
| 2004 | 46.7 mm (1.8 in) |
| 2005 | 22.1 mm (0.9 in) |
| 2006 | 41.4 mm (1.6 in) |
| 2007 | 15.2 mm (0.6 in) |
| 2008 | 41.4 mm (1.6 in) |
| 2009 | 39.7 mm (1.6 in) |
| 2010 | 57.4 mm (2.3 in) |
| 2011 | 41.9 mm (1.6 in) |
| 2012 | 20.8 mm (0.8 in) |
| 2013 | 7.9 mm (0.31 in) |
| 2014 | 58.2 mm (2.3 in) |
| 2015 | 32.8 mm (1.3 in) |
| 2016 | 27.4 mm (1.1 in) |
| 2017 | 44.2 mm (1.7 in) |
| 2018 | 21.3 mm (0.8 in) |
| 2019 | 1.0 mm (0.04 in) |
| 2020 | 52.0 mm (2.0 in) |
| 2021 | 45.8 mm (1.8 in) |
| 2022 | 47.8 mm (1.9 in) |
| 2023 | 48.2 mm (1.9 in) |
| 2024 | 64.8 mm (2.6 in) |
| 2025 | 65.2 mm (2.6 in) |
| 2026 | 53.3 mm (2.1 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1951 | 89 days |
| 1952 | 123 days |
| 1953 | 62 days |
| 1954 | 70 days |
| 1955 | 15 days |
| 1957 | 89 days |
| 1958 | 21 days |
| 1959 | 51 days |
| 1960 | 66 days |
| 1961 | 69 days |
| 1962 | 79 days |
| 1963 | 42 days |
| 1964 | 35 days |
| 1965 | 46 days |
| 1966 | 94 days |
| 1967 | 54 days |
| 1968 | 61 days |
| 1969 | 72 days |
| 1970 | 45 days |
| 1971 | 70 days |
| 1972 | 40 days |
| 1973 | 49 days |
| 1974 | 61 days |
| 1975 | 43 days |
| 1976 | 34 days |
| 1977 | 47 days |
| 1978 | 62 days |
| 1979 | 52 days |
| 1980 | 84 days |
| 1981 | 54 days |
| 1982 | 57 days |
| 1983 | 27 days |
| 1984 | 30 days |
| 1985 | 37 days |
| 1986 | 48 days |
| 1987 | 78 days |
| 1988 | 85 days |
| 1989 | 76 days |
| 1990 | 31 days |
| 1991 | 69 days |
| 1992 | 55 days |
| 1993 | 51 days |
| 1994 | 76 days |
| 1995 | 35 days |
| 1996 | 67 days |
| 1997 | 29 days |
| 1998 | 39 days |
| 1999 | 60 days |
| 2000 | 28 days |
| 2001 | 36 days |
| 2002 | 42 days |
| 2003 | 36 days |
| 2004 | 31 days |
| 2005 | 23 days |
| 2006 | 66 days |
| 2007 | 38 days |
| 2008 | 39 days |
| 2009 | 37 days |
| 2010 | 34 days |
| 2011 | 60 days |
| 2012 | 31 days |
| 2013 | 62 days |
| 2014 | 32 days |
| 2015 | 37 days |
| 2016 | 55 days |
| 2017 | 61 days |
| 2018 | 24 days |
| 2019 | 23 days |
| 2020 | 81 days |
| 2021 | 30 days |
| 2022 | 50 days |
| 2023 | 43 days |
| 2024 | 76 days |
| 2025 | 36 days |
| 2026 | 53 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
32 years with a frostAcross 32 years with a frost, the median last spring frost at Boise Lucky Peak Dam falls on 5 May and the median first autumn frost on 15 October, which leaves a median of 161 days between them.
Fitted over all years, the growing season changes by +4.7 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1960 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 5 May | n/a | 5 May | n/a | -2.2 days per decade |
| First autumn frost | 15 October | n/a | 15 October | n/a | +2.5 days per decade |
| Growing days | 161 days | n/a | 163 days | n/a | +4.7 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
37 years, 1951 to 2025A day with at least 27.0 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 62.0 mm (2.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 27.0 mm (1.1 in) | |
| 5 years | 36.6 mm (1.4 in) | |
| 10 years | 42.9 mm (1.7 in) | |
| 25 years | 50.7 mm (2.0 in) | |
| 50 years | 56.4 mm (2.2 in) | Longer than the 37 years of record |
| 100 years | 62.0 mm (2.4 in) | Longer than the 37 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, 37 years of values from 1951 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: 53.3 mm (2.1 in) in 2010; 53.3 mm (2.1 in) in 2025; 47.5 mm (1.9 in) in 1958.
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).