Boise City 2 E Weather Records (USC00340908)
Record envelope, standing records and threshold days for Boise City 2 E (USC00340908), Oklahoma, United States, with 113 years of record.
Key Facts for Boise City 2 E
- Boise City 2 E (USC00340908) is a weather station in Oklahoma, United States at 36.72 latitude and -102.48 longitude, 1,260 m (4,133 ft) above sea level.
- The station reports from 1908 to 2020, 113 years of record.
- 1,464 records set at Boise City 2 E still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Boise City 2 E set a monthly record low minimum temperature of -13.9 C (7.0 F) on 30 October 2019.
About the Station
- Location: Oklahoma, United States, 36.72 latitude, -102.48 longitude.
- Elevation: 1,260 m (4,133 ft).
- Period of record: 1908 to 2020, 113 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 27.8 C (82.0 F) | -31.1 C (-24.0 F) | n/a | n/a |
| Feb | 30.0 C (86.0 F) | -26.7 C (-16.1 F) | n/a | n/a |
| Mar | 32.8 C (91.0 F) | -24.4 C (-11.9 F) | n/a | n/a |
| Apr | 36.1 C (97.0 F) | -14.4 C (6.1 F) | n/a | n/a |
| May | 38.9 C (102.0 F) | -6.7 C (19.9 F) | n/a | n/a |
| Jun | 42.8 C (109.0 F) | 1.7 C (35.1 F) | n/a | n/a |
| Jul | 42.2 C (108.0 F) | 6.7 C (44.1 F) | n/a | n/a |
| Aug | 41.7 C (107.1 F) | 4.4 C (39.9 F) | n/a | n/a |
| Sep | 40.6 C (105.1 F) | -3.9 C (25.0 F) | n/a | n/a |
| Oct | 35.6 C (96.1 F) | -13.9 C (7.0 F) | n/a | n/a |
| Nov | 31.1 C (88.0 F) | -21.7 C (-7.1 F) | n/a | n/a |
| Dec | 28.9 C (84.0 F) | -27.2 C (-17.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1908 | 19 |
| 1909 | 15 |
| 1910 | 22 |
| 1911 | 37 |
| 1912 | 22 |
| 1913 | 28 |
| 1914 | 13 |
| 1915 | 26 |
| 1916 | 12 |
| 1917 | 13 |
| 1918 | 18 |
| 1919 | 17 |
| 1920 | 14 |
| 1921 | 10 |
| 1922 | 20 |
| 1923 | 10 |
| 1924 | 30 |
| 1930 | 18 |
| 1931 | 17 |
| 1932 | 19 |
| 1933 | 16 |
| 1934 | 27 |
| 1935 | 19 |
| 1936 | 17 |
| 1937 | 12 |
| 1938 | 17 |
| 1939 | 16 |
| 1940 | 13 |
| 1941 | 10 |
| 1942 | 6 |
| 1943 | 13 |
| 1944 | 5 |
| 1945 | 18 |
| 1946 | 15 |
| 1947 | 15 |
| 1948 | 19 |
| 1949 | 9 |
| 1950 | 17 |
| 1951 | 9 |
| 1952 | 14 |
| 1953 | 12 |
| 1954 | 8 |
| 1955 | 15 |
| 1956 | 21 |
| 1957 | 6 |
| 1958 | 4 |
| 1959 | 14 |
| 1960 | 8 |
| 1961 | 9 |
| 1962 | 23 |
| 1963 | 21 |
| 1964 | 8 |
| 1965 | 15 |
| 1966 | 7 |
| 1967 | 16 |
| 1968 | 7 |
| 1969 | 12 |
| 1970 | 14 |
| 1971 | 19 |
| 1972 | 17 |
| 1973 | 7 |
| 1974 | 10 |
| 1975 | 5 |
| 1976 | 5 |
| 1977 | 6 |
| 1978 | 16 |
| 1979 | 16 |
| 1980 | 16 |
| 1981 | 19 |
| 1982 | 12 |
| 1983 | 20 |
| 1984 | 6 |
| 1985 | 16 |
| 1986 | 13 |
| 1987 | 12 |
| 1988 | 2 |
| 1989 | 27 |
| 1990 | 19 |
| 1991 | 10 |
| 1992 | 9 |
| 1993 | 4 |
| 1994 | 7 |
| 1995 | 17 |
| 1996 | 20 |
| 1997 | 14 |
| 1998 | 9 |
| 1999 | 10 |
| 2000 | 12 |
| 2001 | 5 |
| 2002 | 8 |
| 2003 | 18 |
| 2004 | 11 |
| 2005 | 16 |
| 2006 | 19 |
| 2007 | 7 |
| 2008 | 8 |
| 2009 | 8 |
| 2010 | 5 |
| 2011 | 10 |
| 2012 | 5 |
| 2013 | 16 |
| 2014 | 7 |
| 2015 | 8 |
| 2016 | 17 |
| 2017 | 22 |
| 2018 | 4 |
| 2019 | 8 |
All-Time Record Progression
9 new records| Date | Kind | Detail |
|---|---|---|
| 1959-01-04 | Record low minimum temperature | Record low minimum temperature -31.1 C (-24.0 F) |
| 1963-01-12 | Record low maximum temperature | Record low maximum temperature -16.7 C (1.9 F) |
| 1983-12-24 | Record low maximum temperature | Record low maximum temperature -17.2 C (1.0 F) |
| 1989-02-05 | Record low maximum temperature | Record low maximum temperature -17.8 C (0.0 F) |
| 1990-12-22 | Record low maximum temperature | Record low maximum temperature -18.3 C (-0.9 F) |
| 1996-06-25 | Record daily precipitation | Record daily precipitation 119.9 mm (4.7 in) |
| 1998-06-29 | Record high maximum temperature | Record high maximum temperature 42.8 C (109.0 F) |
| 2006-12-30 | Record snow depth | Record snow depth 45.7 cm (18.0 in) |
| 2006-12-31 | Record snow depth | Record snow depth 50.8 cm (20.0 in) |
Wettest Day of Each Month
Jun: 119.9 mm (4.7 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 36.8 mm (1.4 in) | 8 January 1939 |
| Feb | 30.5 mm (1.2 in) | 20 February 1990 |
| Mar | 50.8 mm (2.0 in) | 24 March 2007 |
| Apr | 76.5 mm (3.0 in) | 15 April 2016 |
| May | 77.5 mm (3.1 in) | 31 May 1988 |
| Jun | 119.9 mm (4.7 in) | 25 June 1996 |
| Jul | 109.0 mm (4.3 in) | 31 July 2015 |
| Aug | 99.1 mm (3.9 in) | 30 August 1986 |
| Sep | 63.5 mm (2.5 in) | 21 September 2004 |
| Oct | 93.2 mm (3.7 in) | 11 October 1930 |
| Nov | 53.3 mm (2.1 in) | 1 November 1948 |
| Dec | 33.0 mm (1.3 in) | 30 December 2006 |
Period of Record Coverage
1908 to 2020| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1908 | 345 | 94% | Yes |
| 1909 | 365 | 100% | Yes |
| 1910 | 364 | 100% | Yes |
| 1911 | 361 | 99% | Yes |
| 1912 | 354 | 97% | Yes |
| 1913 | 357 | 98% | Yes |
| 1914 | 361 | 99% | Yes |
| 1915 | 361 | 99% | Yes |
| 1916 | 365 | 100% | Yes |
| 1917 | 361 | 99% | Yes |
| 1918 | 359 | 98% | Yes |
| 1919 | 364 | 100% | Yes |
| 1920 | 360 | 98% | Yes |
| 1921 | 364 | 100% | Yes |
| 1922 | 355 | 97% | Yes |
| 1923 | 357 | 98% | Yes |
| 1924 | 366 | 100% | Yes |
| 1930 | 361 | 99% | Yes |
| 1931 | 358 | 98% | Yes |
| 1932 | 331 | 90% | Yes |
| 1933 | 308 | 84% | No |
| 1934 | 350 | 96% | Yes |
| 1935 | 361 | 99% | Yes |
| 1936 | 363 | 99% | Yes |
| 1937 | 364 | 100% | Yes |
| 1938 | 357 | 98% | Yes |
| 1939 | 362 | 99% | Yes |
| 1940 | 363 | 99% | Yes |
| 1941 | 334 | 92% | Yes |
| 1942 | 364 | 100% | Yes |
| 1943 | 361 | 99% | Yes |
| 1944 | 365 | 100% | Yes |
| 1945 | 362 | 99% | Yes |
| 1946 | 364 | 100% | Yes |
| 1947 | 301 | 82% | No |
| 1948 | 325 | 89% | No |
| 1949 | 345 | 95% | Yes |
| 1950 | 343 | 94% | Yes |
| 1951 | 319 | 87% | No |
| 1952 | 318 | 87% | No |
| 1953 | 277 | 76% | No |
| 1954 | 361 | 99% | Yes |
| 1955 | 333 | 91% | Yes |
| 1956 | 348 | 95% | Yes |
| 1957 | 271 | 74% | No |
| 1958 | 188 | 52% | No |
| 1959 | 363 | 99% | Yes |
| 1960 | 364 | 99% | Yes |
| 1961 | 361 | 99% | Yes |
| 1962 | 364 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 364 | 99% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 364 | 100% | Yes |
| 1971 | 364 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 363 | 99% | Yes |
| 1976 | 334 | 91% | Yes |
| 1977 | 358 | 98% | Yes |
| 1978 | 360 | 99% | Yes |
| 1979 | 363 | 99% | Yes |
| 1980 | 359 | 98% | Yes |
| 1981 | 363 | 99% | Yes |
| 1982 | 360 | 99% | Yes |
| 1983 | 301 | 82% | No |
| 1984 | 299 | 82% | No |
| 1985 | 345 | 95% | Yes |
| 1986 | 360 | 99% | Yes |
| 1987 | 362 | 99% | Yes |
| 1988 | 358 | 98% | Yes |
| 1989 | 361 | 99% | Yes |
| 1990 | 360 | 99% | Yes |
| 1991 | 357 | 98% | Yes |
| 1992 | 355 | 97% | Yes |
| 1993 | 353 | 97% | Yes |
| 1994 | 348 | 95% | Yes |
| 1995 | 349 | 96% | Yes |
| 1996 | 352 | 96% | Yes |
| 1997 | 357 | 98% | Yes |
| 1998 | 356 | 98% | Yes |
| 1999 | 345 | 95% | Yes |
| 2000 | 348 | 95% | Yes |
| 2001 | 320 | 88% | No |
| 2002 | 298 | 82% | No |
| 2003 | 355 | 97% | Yes |
| 2004 | 359 | 98% | Yes |
| 2005 | 342 | 94% | Yes |
| 2006 | 363 | 99% | Yes |
| 2007 | 362 | 99% | Yes |
| 2008 | 362 | 99% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 363 | 99% | Yes |
| 2012 | 365 | 100% | Yes |
| 2013 | 360 | 99% | Yes |
| 2014 | 364 | 100% | Yes |
| 2015 | 363 | 99% | Yes |
| 2016 | 366 | 100% | Yes |
| 2017 | 330 | 90% | Yes |
| 2018 | 132 | 36% | No |
| 2019 | 165 | 45% | No |
| 2020 | 54 | 15% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 30 October 2019 | Boise City 2 E, US | monthly low min | -13.9 C (7.0 F) | 1.1 C (2.0 F) | 25 years | 29 of 100 (Routine) |
| 30 October 2019 | Boise City 2 E, US | daily low max | -4.4 C (24.1 F) | 5.0 C (9.0 F) | 28 years | 26 of 100 (Routine) |
| 29 October 2019 | Boise City 2 E, US | daily low max | 0.0 C (32.0 F) | 3.3 C (5.9 F) | 101 years | 45 of 100 (Notable) |
| 25 October 2019 | Boise City 2 E, US | daily low min (Tie) | -7.8 C (18.0 F) | tie | 21 years | 4 of 100 (Routine) |
| 11 October 2019 | Boise City 2 E, US | daily low min | -8.3 C (17.1 F) | 3.9 C (7.0 F) | 9 years | 21 of 100 (Routine) |
| 27 March 2019 | Boise City 2 E, US | daily high min | 11.1 C (52.0 F) | 2.2 C (4.0 F) | 12 years | 17 of 100 (Routine) |
| 5 March 2019 | Boise City 2 E, US | daily low max | -8.9 C (16.0 F) | 2.2 C (4.0 F) | 70 years | 33 of 100 (Routine) |
| 4 March 2019 | Boise City 2 E, US | daily low max | -8.9 C (16.0 F) | 3.9 C (7.0 F) | 70 years | 36 of 100 (Notable) |
| 4 February 2019 | Boise City 2 E, US | daily high max (Tie) | 22.8 C (73.0 F) | tie | 56 years | 6 of 100 (Routine) |
| 6 January 2019 | Boise City 2 E, US | daily high min | 2.8 C (37.0 F) | 0.6 C (1.1 F) | 80 years | 35 of 100 (Notable) |
| 11 November 2018 | Boise City 2 E, US | daily low max | -0.6 C (30.9 F) | 1.7 C (3.1 F) | 101 years | 42 of 100 (Notable) |
| 3 October 2018 | Boise City 2 E, US | daily high min | 16.7 C (62.1 F) | 0.6 C (1.1 F) | 63 years | 29 of 100 (Routine) |
| 3 October 2018 | Boise City 2 E, US | monthly high max (Tie) | 35.6 C (96.1 F) | tie | 17 years | 6 of 100 (Routine) |
| 31 July 2018 | Boise City 2 E, US | daily low min | 11.7 C (53.1 F) | 0.5 C (0.9 F) | 47 years | 26 of 100 (Routine) |
| 20 July 2018 | Boise City 2 E, US | daily high max | 41.7 C (107.1 F) | 1.1 C (2.0 F) | 7 years | 15 of 100 (Routine) |
| 27 November 2017 | Boise City 2 E, US | daily high max | 28.9 C (84.0 F) | 0.6 C (1.1 F) | 19 years | 15 of 100 (Routine) |
| 25 November 2017 | Boise City 2 E, US | daily high max | 27.2 C (81.0 F) | 1.1 C (2.0 F) | 36 years | 21 of 100 (Routine) |
| 24 November 2017 | Boise City 2 E, US | daily high max | 27.2 C (81.0 F) | 0.5 C (0.9 F) | 75 years | 32 of 100 (Routine) |
| 8 August 2017 | Boise City 2 E, US | daily low max | 23.9 C (75.0 F) | 0.5 C (0.9 F) | 100 years | 41 of 100 (Notable) |
| 7 August 2017 | Boise City 2 E, US | daily low max (Tie) | 20.6 C (69.1 F) | tie | 108 years | 10 of 100 (Routine) |
Climate Trend
89 complete years, 1909 to 2016| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1909 | 12.1 C | -0.89 C |
| 1910 | 13.2 C | +0.20 C |
| 1911 | 12.0 C | -0.94 C |
| 1912 | 10.6 C | -2.39 C |
| 1913 | 12.0 C | -0.98 C |
| 1914 | 12.6 C | -0.36 C |
| 1915 | 10.9 C | -2.08 C |
| 1916 | 12.1 C | -0.89 C |
| 1917 | 12.0 C | -1.00 C |
| 1918 | 12.2 C | -0.76 C |
| 1919 | 11.4 C | -1.62 C |
| 1920 | 12.0 C | -1.03 C |
| 1921 | 13.3 C | +0.27 C |
| 1922 | 12.3 C | -0.67 C |
| 1923 | 11.6 C | -1.39 C |
| 1924 | 11.2 C | -1.79 C |
| 1930 | 12.2 C | -0.75 C |
| 1931 | 12.5 C | -0.49 C |
| 1934 | 14.8 C | +1.80 C |
| 1935 | 13.8 C | +0.77 C |
| 1936 | 13.3 C | +0.33 C |
| 1937 | 12.9 C | -0.06 C |
| 1938 | 13.6 C | +0.57 C |
| 1939 | 13.0 C | +0.02 C |
| 1940 | 12.7 C | -0.27 C |
| 1942 | 12.5 C | -0.45 C |
| 1943 | 13.0 C | +0.03 C |
| 1944 | 12.3 C | -0.69 C |
| 1945 | 12.7 C | -0.28 C |
| 1946 | 13.6 C | +0.59 C |
| 1949 | 11.6 C | -1.41 C |
| 1950 | 12.7 C | -0.24 C |
| 1954 | 14.3 C | +1.29 C |
| 1956 | 14.4 C | +1.44 C |
| 1959 | 12.8 C | -0.23 C |
| 1960 | 12.5 C | -0.49 C |
| 1961 | 12.4 C | -0.56 C |
| 1962 | 13.7 C | +0.71 C |
| 1963 | 14.3 C | +1.33 C |
| 1964 | 13.3 C | +0.32 C |
| 1965 | 13.3 C | +0.31 C |
| 1966 | 13.0 C | -0.01 C |
| 1967 | 13.7 C | +0.75 C |
| 1968 | 13.1 C | +0.14 C |
| 1969 | 13.1 C | +0.11 C |
| 1970 | 13.0 C | +0.02 C |
| 1971 | 13.1 C | +0.16 C |
| 1972 | 13.1 C | +0.13 C |
| 1973 | 12.6 C | -0.42 C |
| 1974 | 13.2 C | +0.17 C |
| 1975 | 12.9 C | -0.13 C |
| 1977 | 13.7 C | +0.69 C |
| 1978 | 12.0 C | -0.98 C |
| 1979 | 11.8 C | -1.23 C |
| 1980 | 13.4 C | +0.45 C |
| 1981 | 14.4 C | +1.41 C |
| 1982 | 12.6 C | -0.42 C |
| 1983 | 12.4 C | -0.62 C |
| 1984 | 12.8 C | -0.15 C |
| 1985 | 13.0 C | -0.03 C |
| 1986 | 14.1 C | +1.11 C |
| 1987 | 12.9 C | -0.07 C |
| 1988 | 12.8 C | -0.15 C |
| 1989 | 13.1 C | +0.14 C |
| 1990 | 13.2 C | +0.22 C |
| 1991 | 13.1 C | +0.13 C |
| 1992 | 13.2 C | +0.17 C |
| 1993 | 12.8 C | -0.18 C |
| 1994 | 13.8 C | +0.77 C |
| 1995 | 13.5 C | +0.51 C |
| 1996 | 13.4 C | +0.43 C |
| 1997 | 12.6 C | -0.35 C |
| 1998 | 13.7 C | +0.72 C |
| 1999 | 13.7 C | +0.75 C |
| 2000 | 14.0 C | +1.04 C |
| 2003 | 13.9 C | +0.93 C |
| 2004 | 13.3 C | +0.32 C |
| 2005 | 13.5 C | +0.52 C |
| 2006 | 13.7 C | +0.74 C |
| 2007 | 12.8 C | -0.17 C |
| 2008 | 13.4 C | +0.39 C |
| 2009 | 13.0 C | -0.01 C |
| 2010 | 13.2 C | +0.24 C |
| 2011 | 13.5 C | +0.48 C |
| 2012 | 14.5 C | +1.52 C |
| 2013 | 12.9 C | -0.05 C |
| 2014 | 13.3 C | +0.32 C |
| 2015 | 13.7 C | +0.73 C |
| 2016 | 14.2 C | +1.24 C |
The annual mean temperature here has risen by 0.1 C (0.1 to 0.2) per decade over 1909 to 2016. In Fahrenheit: 0.2 F (0.2 to 0.3) per decade. The slope is a straight line fitted to 89 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.1 C (0.1 to 0.2) per decade | 0.2 F (0.2 to 0.3) per decade | 1909 to 2016 | 89 | Rise |
| Mean daily maximum | 0.2 C (0.2 to 0.3) per decade | 0.4 F (0.3 to 0.5) per decade | 1909 to 2016 | 89 | Rise |
| Mean daily minimum | 0.04 C (0.00 to 0.09) per decade | 0.08 F (0.00 to 0.15) per decade | 1909 to 2016 | 89 | 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
1908 to 2020| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 42.8 C (109.0 F) | 1998 | 39.4 C (102.9 F) | 108 |
| Coldest night (TNn) | -31.1 C (-24.0 F) | 1959 | -21.1 C (-6.0 F) | 108 |
| Wettest day (Rx1day) | 119.9 mm (4.7 in) | 1996 | 45.5 mm (1.8 in) | 96 |
| Wettest five days (Rx5day) | 227.3 mm (8.9 in) | 1962 | 70.1 mm (2.8 in) | 96 |
| Longest dry spell (CDD) | 86 days | 1970 | 43 days | 96 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1908 | 40.0 C (104.0 F) |
| 1909 | 40.6 C (105.1 F) |
| 1910 | 40.6 C (105.1 F) |
| 1911 | 40.0 C (104.0 F) |
| 1912 | 39.4 C (102.9 F) |
| 1913 | 42.2 C (108.0 F) |
| 1914 | 39.4 C (102.9 F) |
| 1915 | 40.6 C (105.1 F) |
| 1916 | 39.4 C (102.9 F) |
| 1917 | 39.4 C (102.9 F) |
| 1918 | 38.9 C (102.0 F) |
| 1919 | 37.8 C (100.0 F) |
| 1920 | 39.4 C (102.9 F) |
| 1921 | 40.6 C (105.1 F) |
| 1922 | 39.4 C (102.9 F) |
| 1923 | 39.4 C (102.9 F) |
| 1924 | 41.7 C (107.1 F) |
| 1930 | 39.4 C (102.9 F) |
| 1931 | 38.3 C (100.9 F) |
| 1932 | 37.2 C (99.0 F) |
| 1933 | 40.0 C (104.0 F) |
| 1934 | 40.6 C (105.1 F) |
| 1935 | 37.8 C (100.0 F) |
| 1936 | 40.0 C (104.0 F) |
| 1937 | 40.0 C (104.0 F) |
| 1938 | 38.3 C (100.9 F) |
| 1939 | 39.4 C (102.9 F) |
| 1940 | 40.0 C (104.0 F) |
| 1941 | 36.7 C (98.1 F) |
| 1942 | 36.7 C (98.1 F) |
| 1943 | 40.6 C (105.1 F) |
| 1944 | 40.0 C (104.0 F) |
| 1945 | 38.3 C (100.9 F) |
| 1946 | 38.9 C (102.0 F) |
| 1947 | 38.9 C (102.0 F) |
| 1948 | 37.2 C (99.0 F) |
| 1949 | 37.2 C (99.0 F) |
| 1950 | 36.7 C (98.1 F) |
| 1951 | 37.8 C (100.0 F) |
| 1952 | 39.4 C (102.9 F) |
| 1953 | 41.7 C (107.1 F) |
| 1954 | 38.3 C (100.9 F) |
| 1955 | 38.9 C (102.0 F) |
| 1956 | 39.4 C (102.9 F) |
| 1957 | 40.6 C (105.1 F) |
| 1958 | 34.4 C (93.9 F) |
| 1959 | 38.9 C (102.0 F) |
| 1960 | 41.1 C (106.0 F) |
| 1961 | 38.9 C (102.0 F) |
| 1962 | 39.4 C (102.9 F) |
| 1963 | 40.6 C (105.1 F) |
| 1964 | 41.7 C (107.1 F) |
| 1965 | 38.3 C (100.9 F) |
| 1966 | 40.6 C (105.1 F) |
| 1967 | 38.3 C (100.9 F) |
| 1968 | 42.2 C (108.0 F) |
| 1969 | 40.0 C (104.0 F) |
| 1970 | 39.4 C (102.9 F) |
| 1971 | 41.7 C (107.1 F) |
| 1972 | 37.8 C (100.0 F) |
| 1973 | 41.1 C (106.0 F) |
| 1974 | 39.4 C (102.9 F) |
| 1975 | 37.8 C (100.0 F) |
| 1976 | 38.9 C (102.0 F) |
| 1977 | 40.0 C (104.0 F) |
| 1978 | 40.6 C (105.1 F) |
| 1979 | 37.2 C (99.0 F) |
| 1980 | 42.2 C (108.0 F) |
| 1981 | 41.1 C (106.0 F) |
| 1982 | 37.8 C (100.0 F) |
| 1983 | 37.8 C (100.0 F) |
| 1984 | 38.3 C (100.9 F) |
| 1985 | 40.0 C (104.0 F) |
| 1986 | 37.8 C (100.0 F) |
| 1987 | 37.2 C (99.0 F) |
| 1988 | 36.7 C (98.1 F) |
| 1989 | 37.8 C (100.0 F) |
| 1990 | 39.4 C (102.9 F) |
| 1991 | 37.8 C (100.0 F) |
| 1992 | 41.1 C (106.0 F) |
| 1993 | 39.4 C (102.9 F) |
| 1994 | 40.0 C (104.0 F) |
| 1995 | 40.6 C (105.1 F) |
| 1996 | 38.9 C (102.0 F) |
| 1997 | 39.4 C (102.9 F) |
| 1998 | 42.8 C (109.0 F) |
| 1999 | 38.3 C (100.9 F) |
| 2000 | 38.9 C (102.0 F) |
| 2001 | 40.0 C (104.0 F) |
| 2002 | 38.9 C (102.0 F) |
| 2003 | 40.6 C (105.1 F) |
| 2004 | 38.3 C (100.9 F) |
| 2005 | 38.9 C (102.0 F) |
| 2006 | 40.6 C (105.1 F) |
| 2007 | 38.9 C (102.0 F) |
| 2008 | 38.9 C (102.0 F) |
| 2009 | 40.0 C (104.0 F) |
| 2010 | 38.3 C (100.9 F) |
| 2011 | 41.7 C (107.1 F) |
| 2012 | 41.1 C (106.0 F) |
| 2013 | 41.7 C (107.1 F) |
| 2014 | 41.1 C (106.0 F) |
| 2015 | 38.9 C (102.0 F) |
| 2016 | 38.9 C (102.0 F) |
| 2017 | 37.8 C (100.0 F) |
| 2018 | 41.7 C (107.1 F) |
| 2019 | 32.8 C (91.0 F) |
| 2020 | 24.4 C (75.9 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1908 | -18.9 C (-2.0 F) |
| 1909 | -20.0 C (-4.0 F) |
| 1910 | -26.7 C (-16.1 F) |
| 1911 | -28.9 C (-20.0 F) |
| 1912 | -26.1 C (-15.0 F) |
| 1913 | -26.1 C (-15.0 F) |
| 1914 | -21.7 C (-7.1 F) |
| 1915 | -17.8 C (0.0 F) |
| 1916 | -21.1 C (-6.0 F) |
| 1917 | -17.8 C (0.0 F) |
| 1918 | -22.8 C (-9.0 F) |
| 1919 | -25.0 C (-13.0 F) |
| 1920 | -17.2 C (1.0 F) |
| 1921 | -16.1 C (3.0 F) |
| 1922 | -22.2 C (-8.0 F) |
| 1923 | -21.1 C (-6.0 F) |
| 1924 | -27.2 C (-17.0 F) |
| 1930 | -25.0 C (-13.0 F) |
| 1931 | -16.1 C (3.0 F) |
| 1932 | -25.0 C (-13.0 F) |
| 1933 | -26.7 C (-16.1 F) |
| 1934 | -15.6 C (3.9 F) |
| 1935 | -21.7 C (-7.1 F) |
| 1936 | -22.8 C (-9.0 F) |
| 1937 | -22.2 C (-8.0 F) |
| 1938 | -18.9 C (-2.0 F) |
| 1939 | -22.8 C (-9.0 F) |
| 1940 | -22.8 C (-9.0 F) |
| 1941 | -12.2 C (10.0 F) |
| 1942 | -20.0 C (-4.0 F) |
| 1943 | -26.7 C (-16.1 F) |
| 1944 | -18.3 C (-0.9 F) |
| 1945 | -18.3 C (-0.9 F) |
| 1946 | -17.8 C (0.0 F) |
| 1947 | -23.3 C (-9.9 F) |
| 1948 | -24.4 C (-11.9 F) |
| 1949 | -20.6 C (-5.1 F) |
| 1950 | -22.2 C (-8.0 F) |
| 1951 | -26.7 C (-16.1 F) |
| 1952 | -16.1 C (3.0 F) |
| 1953 | -16.7 C (1.9 F) |
| 1954 | -19.4 C (-2.9 F) |
| 1955 | -20.0 C (-4.0 F) |
| 1956 | -18.9 C (-2.0 F) |
| 1957 | -18.3 C (-0.9 F) |
| 1958 | -18.3 C (-0.9 F) |
| 1959 | -31.1 C (-24.0 F) |
| 1960 | -21.1 C (-6.0 F) |
| 1961 | -23.9 C (-11.0 F) |
| 1962 | -23.9 C (-11.0 F) |
| 1963 | -27.2 C (-17.0 F) |
| 1964 | -21.7 C (-7.1 F) |
| 1965 | -18.9 C (-2.0 F) |
| 1966 | -23.3 C (-9.9 F) |
| 1967 | -15.0 C (5.0 F) |
| 1968 | -19.4 C (-2.9 F) |
| 1969 | -17.8 C (0.0 F) |
| 1970 | -18.3 C (-0.9 F) |
| 1971 | -22.8 C (-9.0 F) |
| 1972 | -22.2 C (-8.0 F) |
| 1973 | -18.9 C (-2.0 F) |
| 1974 | -25.0 C (-13.0 F) |
| 1975 | -21.7 C (-7.1 F) |
| 1976 | -21.7 C (-7.1 F) |
| 1977 | -20.0 C (-4.0 F) |
| 1978 | -25.0 C (-13.0 F) |
| 1979 | -25.0 C (-13.0 F) |
| 1980 | -17.2 C (1.0 F) |
| 1981 | -23.9 C (-11.0 F) |
| 1982 | -25.6 C (-14.1 F) |
| 1983 | -25.0 C (-13.0 F) |
| 1984 | -26.1 C (-15.0 F) |
| 1985 | -21.7 C (-7.1 F) |
| 1986 | -23.3 C (-9.9 F) |
| 1987 | -23.3 C (-9.9 F) |
| 1988 | -26.7 C (-16.1 F) |
| 1989 | -25.0 C (-13.0 F) |
| 1990 | -23.9 C (-11.0 F) |
| 1991 | -21.1 C (-6.0 F) |
| 1992 | -14.4 C (6.1 F) |
| 1993 | -17.2 C (1.0 F) |
| 1994 | -17.2 C (1.0 F) |
| 1995 | -16.7 C (1.9 F) |
| 1996 | -26.1 C (-15.0 F) |
| 1997 | -18.9 C (-2.0 F) |
| 1998 | -21.7 C (-7.1 F) |
| 1999 | -12.8 C (9.0 F) |
| 2000 | -15.6 C (3.9 F) |
| 2001 | -18.3 C (-0.9 F) |
| 2002 | -16.7 C (1.9 F) |
| 2003 | -17.2 C (1.0 F) |
| 2004 | -22.2 C (-8.0 F) |
| 2005 | -23.3 C (-9.9 F) |
| 2006 | -18.9 C (-2.0 F) |
| 2007 | -18.9 C (-2.0 F) |
| 2008 | -20.0 C (-4.0 F) |
| 2009 | -17.2 C (1.0 F) |
| 2010 | -20.6 C (-5.1 F) |
| 2011 | -26.1 C (-15.0 F) |
| 2012 | -17.2 C (1.0 F) |
| 2013 | -18.3 C (-0.9 F) |
| 2014 | -20.0 C (-4.0 F) |
| 2015 | -21.7 C (-7.1 F) |
| 2016 | -25.0 C (-13.0 F) |
| 2017 | -21.7 C (-7.1 F) |
| 2018 | -20.6 C (-5.1 F) |
| 2019 | -16.1 C (3.0 F) |
| 2020 | -16.1 C (3.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1908 | 53.3 mm (2.1 in) |
| 1909 | 44.5 mm (1.8 in) |
| 1910 | 50.8 mm (2.0 in) |
| 1911 | 64.8 mm (2.6 in) |
| 1912 | n/a |
| 1913 | n/a |
| 1914 | n/a |
| 1915 | n/a |
| 1916 | n/a |
| 1917 | 16.3 mm (0.6 in) |
| 1918 | n/a |
| 1919 | n/a |
| 1920 | 41.7 mm (1.6 in) |
| 1921 | 30.2 mm (1.2 in) |
| 1922 | n/a |
| 1923 | 47.8 mm (1.9 in) |
| 1924 | 24.9 mm (1.0 in) |
| 1930 | 93.2 mm (3.7 in) |
| 1931 | 34.3 mm (1.4 in) |
| 1932 | 26.7 mm (1.1 in) |
| 1933 | 72.9 mm (2.9 in) |
| 1934 | 19.6 mm (0.8 in) |
| 1935 | 36.8 mm (1.4 in) |
| 1936 | 26.4 mm (1.0 in) |
| 1937 | 32.5 mm (1.3 in) |
| 1938 | 47.8 mm (1.9 in) |
| 1939 | 36.8 mm (1.4 in) |
| 1940 | 54.6 mm (2.1 in) |
| 1941 | 51.3 mm (2.0 in) |
| 1942 | 66.3 mm (2.6 in) |
| 1943 | 45.7 mm (1.8 in) |
| 1944 | 58.4 mm (2.3 in) |
| 1945 | 41.9 mm (1.6 in) |
| 1946 | 52.1 mm (2.1 in) |
| 1947 | 63.5 mm (2.5 in) |
| 1948 | 61.0 mm (2.4 in) |
| 1949 | 45.2 mm (1.8 in) |
| 1950 | 108.2 mm (4.3 in) |
| 1951 | 46.2 mm (1.8 in) |
| 1952 | 54.1 mm (2.1 in) |
| 1953 | 30.2 mm (1.2 in) |
| 1954 | 49.3 mm (1.9 in) |
| 1955 | 33.3 mm (1.3 in) |
| 1956 | 44.5 mm (1.8 in) |
| 1957 | 41.1 mm (1.6 in) |
| 1958 | 68.6 mm (2.7 in) |
| 1959 | 38.6 mm (1.5 in) |
| 1960 | 48.3 mm (1.9 in) |
| 1961 | 26.9 mm (1.1 in) |
| 1962 | 78.7 mm (3.1 in) |
| 1963 | 26.4 mm (1.0 in) |
| 1964 | 28.7 mm (1.1 in) |
| 1965 | 44.5 mm (1.8 in) |
| 1966 | 49.5 mm (1.9 in) |
| 1967 | 49.0 mm (1.9 in) |
| 1968 | 43.4 mm (1.7 in) |
| 1969 | 77.2 mm (3.0 in) |
| 1970 | 27.9 mm (1.1 in) |
| 1971 | 66.0 mm (2.6 in) |
| 1972 | 34.5 mm (1.4 in) |
| 1973 | 34.8 mm (1.4 in) |
| 1974 | 53.3 mm (2.1 in) |
| 1975 | 37.8 mm (1.5 in) |
| 1976 | 35.3 mm (1.4 in) |
| 1977 | 35.6 mm (1.4 in) |
| 1978 | 27.7 mm (1.1 in) |
| 1979 | 39.4 mm (1.6 in) |
| 1980 | 34.3 mm (1.4 in) |
| 1981 | 61.0 mm (2.4 in) |
| 1982 | 40.6 mm (1.6 in) |
| 1983 | 31.0 mm (1.2 in) |
| 1984 | 27.9 mm (1.1 in) |
| 1985 | 68.6 mm (2.7 in) |
| 1986 | 99.1 mm (3.9 in) |
| 1987 | 74.9 mm (2.9 in) |
| 1988 | 77.5 mm (3.1 in) |
| 1989 | 81.3 mm (3.2 in) |
| 1990 | 35.6 mm (1.4 in) |
| 1991 | 47.5 mm (1.9 in) |
| 1992 | 51.3 mm (2.0 in) |
| 1993 | 35.6 mm (1.4 in) |
| 1994 | 41.9 mm (1.6 in) |
| 1995 | 35.6 mm (1.4 in) |
| 1996 | 119.9 mm (4.7 in) |
| 1997 | 37.8 mm (1.5 in) |
| 1998 | 57.2 mm (2.3 in) |
| 1999 | 75.2 mm (3.0 in) |
| 2000 | 75.2 mm (3.0 in) |
| 2001 | 43.2 mm (1.7 in) |
| 2002 | 98.3 mm (3.9 in) |
| 2003 | 38.1 mm (1.5 in) |
| 2004 | 63.5 mm (2.5 in) |
| 2005 | 29.0 mm (1.1 in) |
| 2006 | 54.6 mm (2.1 in) |
| 2007 | 50.8 mm (2.0 in) |
| 2008 | 44.2 mm (1.7 in) |
| 2009 | 33.0 mm (1.3 in) |
| 2010 | 34.0 mm (1.3 in) |
| 2011 | 32.8 mm (1.3 in) |
| 2012 | 65.0 mm (2.6 in) |
| 2013 | 62.5 mm (2.5 in) |
| 2014 | 46.7 mm (1.8 in) |
| 2015 | 109.0 mm (4.3 in) |
| 2016 | 76.5 mm (3.0 in) |
| 2017 | n/a |
| 2018 | n/a |
| 2019 | n/a |
| 2020 | n/a |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1908 | 63.5 mm (2.5 in) |
| 1909 | 76.2 mm (3.0 in) |
| 1910 | 63.5 mm (2.5 in) |
| 1911 | 81.8 mm (3.2 in) |
| 1912 | n/a |
| 1913 | n/a |
| 1914 | n/a |
| 1915 | n/a |
| 1916 | n/a |
| 1917 | 16.3 mm (0.6 in) |
| 1918 | n/a |
| 1919 | n/a |
| 1920 | 108.0 mm (4.3 in) |
| 1921 | 33.8 mm (1.3 in) |
| 1922 | n/a |
| 1923 | 84.6 mm (3.3 in) |
| 1924 | 42.7 mm (1.7 in) |
| 1930 | 131.1 mm (5.2 in) |
| 1931 | 34.3 mm (1.4 in) |
| 1932 | 42.2 mm (1.7 in) |
| 1933 | 72.9 mm (2.9 in) |
| 1934 | 28.2 mm (1.1 in) |
| 1935 | 36.8 mm (1.4 in) |
| 1936 | 26.6 mm (1.0 in) |
| 1937 | 60.9 mm (2.4 in) |
| 1938 | 83.8 mm (3.3 in) |
| 1939 | 50.3 mm (2.0 in) |
| 1940 | 65.6 mm (2.6 in) |
| 1941 | 90.6 mm (3.6 in) |
| 1942 | 110.0 mm (4.3 in) |
| 1943 | 73.9 mm (2.9 in) |
| 1944 | 80.7 mm (3.2 in) |
| 1945 | 48.3 mm (1.9 in) |
| 1946 | 104.2 mm (4.1 in) |
| 1947 | 71.1 mm (2.8 in) |
| 1948 | 70.9 mm (2.8 in) |
| 1949 | 71.5 mm (2.8 in) |
| 1950 | 114.3 mm (4.5 in) |
| 1951 | 68.1 mm (2.7 in) |
| 1952 | 132.8 mm (5.2 in) |
| 1953 | 50.8 mm (2.0 in) |
| 1954 | 49.3 mm (1.9 in) |
| 1955 | 78.5 mm (3.1 in) |
| 1956 | 45.3 mm (1.8 in) |
| 1957 | 54.9 mm (2.2 in) |
| 1958 | 91.8 mm (3.6 in) |
| 1959 | 55.3 mm (2.2 in) |
| 1960 | 84.2 mm (3.3 in) |
| 1961 | 33.0 mm (1.3 in) |
| 1962 | 227.3 mm (8.9 in) |
| 1963 | 58.9 mm (2.3 in) |
| 1964 | 53.9 mm (2.1 in) |
| 1965 | 81.6 mm (3.2 in) |
| 1966 | 102.6 mm (4.0 in) |
| 1967 | 60.2 mm (2.4 in) |
| 1968 | 58.6 mm (2.3 in) |
| 1969 | 107.2 mm (4.2 in) |
| 1970 | 32.8 mm (1.3 in) |
| 1971 | 85.6 mm (3.4 in) |
| 1972 | 52.5 mm (2.1 in) |
| 1973 | 62.8 mm (2.5 in) |
| 1974 | 74.4 mm (2.9 in) |
| 1975 | 52.6 mm (2.1 in) |
| 1976 | 48.5 mm (1.9 in) |
| 1977 | 61.6 mm (2.4 in) |
| 1978 | 72.1 mm (2.8 in) |
| 1979 | 59.5 mm (2.3 in) |
| 1980 | 66.1 mm (2.6 in) |
| 1981 | 84.4 mm (3.3 in) |
| 1982 | 78.7 mm (3.1 in) |
| 1983 | 68.3 mm (2.7 in) |
| 1984 | 40.9 mm (1.6 in) |
| 1985 | 68.6 mm (2.7 in) |
| 1986 | 105.5 mm (4.2 in) |
| 1987 | 79.2 mm (3.1 in) |
| 1988 | 88.9 mm (3.5 in) |
| 1989 | 82.1 mm (3.2 in) |
| 1990 | 91.0 mm (3.6 in) |
| 1991 | 51.6 mm (2.0 in) |
| 1992 | 80.8 mm (3.2 in) |
| 1993 | 56.7 mm (2.2 in) |
| 1994 | 61.8 mm (2.4 in) |
| 1995 | 58.0 mm (2.3 in) |
| 1996 | 133.1 mm (5.2 in) |
| 1997 | 69.2 mm (2.7 in) |
| 1998 | 83.8 mm (3.3 in) |
| 1999 | 150.4 mm (5.9 in) |
| 2000 | 111.0 mm (4.4 in) |
| 2001 | 82.1 mm (3.2 in) |
| 2002 | 98.3 mm (3.9 in) |
| 2003 | 81.3 mm (3.2 in) |
| 2004 | 87.6 mm (3.4 in) |
| 2005 | 50.1 mm (2.0 in) |
| 2006 | 65.5 mm (2.6 in) |
| 2007 | 63.3 mm (2.5 in) |
| 2008 | 128.0 mm (5.0 in) |
| 2009 | 47.7 mm (1.9 in) |
| 2010 | 50.3 mm (2.0 in) |
| 2011 | 32.8 mm (1.3 in) |
| 2012 | 86.3 mm (3.4 in) |
| 2013 | 136.1 mm (5.4 in) |
| 2014 | 66.0 mm (2.6 in) |
| 2015 | 152.7 mm (6.0 in) |
| 2016 | 128.3 mm (5.1 in) |
| 2017 | n/a |
| 2018 | n/a |
| 2019 | n/a |
| 2020 | n/a |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1908 | 54 days |
| 1909 | 59 days |
| 1910 | 75 days |
| 1911 | 43 days |
| 1912 | n/a |
| 1913 | n/a |
| 1914 | n/a |
| 1915 | n/a |
| 1916 | n/a |
| 1917 | 21 days |
| 1918 | n/a |
| 1919 | n/a |
| 1920 | 48 days |
| 1921 | 13 days |
| 1922 | n/a |
| 1923 | 15 days |
| 1924 | 41 days |
| 1930 | 51 days |
| 1931 | 31 days |
| 1932 | 30 days |
| 1933 | 38 days |
| 1934 | 40 days |
| 1935 | 57 days |
| 1936 | 66 days |
| 1937 | 43 days |
| 1938 | 47 days |
| 1939 | 61 days |
| 1940 | 39 days |
| 1941 | 29 days |
| 1942 | 41 days |
| 1943 | 52 days |
| 1944 | 26 days |
| 1945 | 38 days |
| 1946 | 48 days |
| 1947 | 51 days |
| 1948 | 42 days |
| 1949 | 29 days |
| 1950 | 59 days |
| 1951 | 39 days |
| 1952 | 47 days |
| 1953 | 40 days |
| 1954 | 41 days |
| 1955 | 38 days |
| 1956 | 72 days |
| 1957 | 40 days |
| 1958 | 18 days |
| 1959 | 21 days |
| 1960 | 29 days |
| 1961 | 35 days |
| 1962 | 56 days |
| 1963 | 50 days |
| 1964 | 55 days |
| 1965 | 53 days |
| 1966 | 69 days |
| 1967 | 59 days |
| 1968 | 42 days |
| 1969 | 44 days |
| 1970 | 86 days |
| 1971 | 34 days |
| 1972 | 74 days |
| 1973 | 39 days |
| 1974 | 47 days |
| 1975 | 42 days |
| 1976 | 34 days |
| 1977 | 50 days |
| 1978 | 72 days |
| 1979 | 47 days |
| 1980 | 67 days |
| 1981 | 43 days |
| 1982 | 34 days |
| 1983 | 28 days |
| 1984 | 31 days |
| 1985 | 41 days |
| 1986 | 38 days |
| 1987 | 26 days |
| 1988 | 42 days |
| 1989 | 51 days |
| 1990 | 44 days |
| 1991 | 48 days |
| 1992 | 50 days |
| 1993 | 28 days |
| 1994 | 36 days |
| 1995 | 46 days |
| 1996 | 50 days |
| 1997 | 31 days |
| 1998 | 35 days |
| 1999 | 55 days |
| 2000 | 64 days |
| 2001 | 39 days |
| 2002 | 66 days |
| 2003 | 58 days |
| 2004 | 28 days |
| 2005 | 34 days |
| 2006 | 62 days |
| 2007 | 72 days |
| 2008 | 55 days |
| 2009 | 45 days |
| 2010 | 56 days |
| 2011 | 69 days |
| 2012 | 61 days |
| 2013 | 42 days |
| 2014 | 34 days |
| 2015 | 21 days |
| 2016 | 54 days |
| 2017 | n/a |
| 2018 | n/a |
| 2019 | n/a |
| 2020 | n/a |
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
89 years with a frostAcross 89 years with a frost, the median last spring frost at Boise City 2 E falls on 27 April and the median first autumn frost on 17 October, which leaves a median of 175 days between them.
In 1985 to 2016 the median growing season was 176 days. That is 1 day more than in 1909 to 1946.
Fitted over all years, the growing season changes by -0.1 days per decade at this station.
| Measure | Median, all years | Earliest period (1909 to 1946) | Recent period (1985 to 2016) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 27 April | 25 April | 27 April | 2 days later | +0.1 days per decade |
| First autumn frost | 17 October | 16 October | 18 October | 2 days later | 0.0 days per decade |
| Growing days | 175 days | 175 days | 176 days | 1 day more | -0.1 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
86 years, 1909 to 2015A day with at least 44.7 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 126.5 mm (5.0 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 44.7 mm (1.8 in) | |
| 5 years | 62.1 mm (2.4 in) | |
| 10 years | 75.2 mm (3.0 in) | |
| 25 years | 93.9 mm (3.7 in) | |
| 50 years | 109.5 mm (4.3 in) | |
| 100 years | 126.5 mm (5.0 in) | Longer than the 86 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, 86 years of values from 1909 to 2015.
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: 119.9 mm (4.7 in) in 1996; 109.0 mm (4.3 in) in 2015; 108.2 mm (4.3 in) in 1950.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Boise City 2 E, at 2005. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 2005 ran 0.4 C (0.6 F) lower than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 2005 | -0.4 | -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
2000 to 2016 against 1961 to 1990Over 2000 to 2016, Boise City 2 E had a mean temperature of 13.5 C (56.4 F) and 442.2 mm (17.4 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Dumas (United States, 105 km away), Hereford (United States, 212 km away) and Bell Ranch (United States, 196 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Dumas | United States | 105 km (65 mi) | 13.3 C (55.9 F) | 437.5 mm (17.2 in) | 0.58 |
| Hereford | United States | 212 km (132 mi) | 13.4 C (56.0 F) | 435.9 mm (17.2 in) | 0.61 |
| Bell Ranch | United States | 196 km (122 mi) | 13.4 C (56.2 F) | 354.1 mm (13.9 in) | 0.61 |
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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).