Napas Threshold Days by Year (RSM00029023)
13 fixed thresholds counted per year at Napas (RSM00029023): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Napas Thresholds
- Napas: days with 10 mm (0.39 in) or more of precipitation in 86 years, most in 1944 with 25.
- Napas: nights with a minimum temperature at or below 0 C (32 F) in 81 years, most in 1968 with 237.
- Napas: nights with a minimum temperature at or below -10 C (14 F) in 81 years, most in 1952 with 170.
- Napas: nights with a minimum temperature at or below -20 C (-4 F) in 81 years, most in 1952 with 123.
- 13 fixed thresholds have at least one qualifying day at Napas.
Days at or above 30 C (86 F)
68 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1938 | 2 | 2.5 |
| 1939 | 3 | 2.5 |
| 1940 | 3 | 3.5 |
| 1942 | 6 | 3.5 |
| 1944 | 6 | 3.5 |
| 1946 | 3 | 3.5 |
| 1947 | 2 | 3.5 |
| 1948 | 1 | 3.5 |
| 1950 | 2 | 4.9 |
| 1951 | 5 | 4.9 |
| 1952 | 6 | 4.9 |
| 1953 | 4 | 4.9 |
| 1954 | 1 | 4.9 |
| 1955 | 9 | 4.9 |
| 1956 | 4 | 4.9 |
| 1957 | 7 | 4.9 |
| 1958 | 6 | 4.9 |
| 1961 | 9 | 6 |
| 1962 | 2 | 6 |
| 1963 | 2 | 6 |
| 1964 | 4 | 6 |
| 1965 | 1 | 6 |
| 1966 | 3 | 6 |
| 1967 | 8 | 6 |
| 1968 | 7 | 6 |
| 1969 | 18 | 6 |
| 1970 | 2 | 4 |
| 1971 | 4 | 4 |
| 1974 | 3 | 4 |
| 1975 | 8 | 4 |
| 1976 | 5 | 4 |
| 1977 | 2 | 4 |
| 1978 | 4 | 4 |
| 1981 | 3 | 4.3 |
| 1982 | 6 | 4.3 |
| 1983 | 11 | 4.3 |
| 1984 | 4 | 4.3 |
| 1985 | 1 | 4.3 |
| 1986 | 1 | 4.3 |
| 1987 | 1 | 4.3 |
| 1989 | 7 | 4.3 |
| 1990 | 3 | 5.3 |
| 1991 | 4 | 5.3 |
| 1993 | 9 | 5.3 |
| 1994 | 7 | 5.3 |
| 1995 | 1 | 5.3 |
| 1996 | 7 | 5.3 |
| 1998 | 4 | 5.3 |
| 1999 | 7 | 5.3 |
| 2000 | 1 | 5.7 |
| 2001 | 4 | 5.7 |
| 2002 | 2 | 5.7 |
| 2003 | 9 | 5.7 |
| 2004 | 7 | 5.7 |
| 2005 | 9 | 5.7 |
| 2006 | 8 | 5.7 |
| 2007 | 9 | 5.7 |
| 2009 | 2 | 5.7 |
| 2010 | 1 | 5.2 |
| 2011 | 4 | 5.2 |
| 2012 | 16 | 5.2 |
| 2013 | 3 | 5.2 |
| 2014 | 7 | 5.2 |
| 2015 | 1 | 5.2 |
| 2016 | 5 | 5.2 |
| 2017 | 7 | 5.2 |
| 2018 | 3 | 5.2 |
| 2025 | 2 | 2 |
| Year | First date | Last date |
|---|---|---|
| 1938 | 1938-06-22 | 1938-06-24 |
| 1939 | 1939-06-26 | 1939-06-28 |
| 1940 | 1940-06-14 | 1940-08-01 |
| 1942 | 1942-07-23 | 1942-07-30 |
| 1944 | 1944-06-25 | 1944-08-17 |
| 1946 | 1946-07-07 | 1946-07-10 |
| 1947 | 1947-06-09 | 1947-08-01 |
| 1948 | 1948-07-30 | 1948-07-30 |
| 1950 | 1950-06-16 | 1950-07-04 |
| 1951 | 1951-07-23 | 1951-07-28 |
| 1952 | 1952-05-29 | 1952-07-31 |
| 1953 | 1953-07-18 | 1953-07-21 |
| 1954 | 1954-07-31 | 1954-07-31 |
| 1955 | 1955-05-27 | 1955-07-02 |
| 1956 | 1956-07-02 | 1956-07-06 |
| 1957 | 1957-06-20 | 1957-07-05 |
| 1958 | 1958-06-18 | 1958-07-16 |
| 1961 | 1961-06-26 | 1961-07-04 |
| 1962 | 1962-07-21 | 1962-07-27 |
| 1963 | 1963-06-23 | 1963-07-06 |
| 1964 | 1964-07-12 | 1964-07-23 |
| 1965 | 1965-07-06 | 1965-07-06 |
| 1966 | 1966-06-05 | 1966-07-19 |
| 1967 | 1967-07-05 | 1967-07-13 |
| 1968 | 1968-05-23 | 1968-07-16 |
| 1969 | 1969-06-26 | 1969-07-27 |
| 1970 | 1970-06-19 | 1970-06-20 |
| 1971 | 1971-06-19 | 1971-06-22 |
| 1974 | 1974-07-09 | 1974-07-11 |
| 1975 | 1975-07-07 | 1975-07-25 |
| 1976 | 1976-06-08 | 1976-07-06 |
| 1977 | 1977-06-28 | 1977-07-19 |
| 1978 | 1978-06-17 | 1978-07-05 |
| 1981 | 1981-06-19 | 1981-06-21 |
| 1982 | 1982-06-19 | 1982-08-05 |
| 1983 | 1983-06-08 | 1983-07-01 |
| 1984 | 1984-07-04 | 1984-08-17 |
| 1985 | 1985-06-27 | 1985-06-27 |
| 1986 | 1986-07-01 | 1986-07-01 |
| 1987 | 1987-06-21 | 1987-06-21 |
| 1989 | 1989-07-09 | 1989-07-24 |
| 1990 | 1990-07-10 | 1990-07-12 |
| 1991 | 1991-06-05 | 1991-07-28 |
| 1993 | 1993-07-03 | 1993-07-23 |
| 1994 | 1994-06-27 | 1994-07-11 |
| 1995 | 1995-08-10 | 1995-08-10 |
| 1996 | 1996-07-18 | 1996-07-26 |
| 1998 | 1998-07-28 | 1998-08-16 |
| 1999 | 1999-07-07 | 1999-07-15 |
| 2000 | 2000-07-05 | 2000-07-05 |
| 2001 | 2001-05-26 | 2001-08-08 |
| 2002 | 2002-07-28 | 2002-07-29 |
| 2003 | 2003-06-25 | 2003-07-09 |
| 2004 | 2004-05-15 | 2004-06-29 |
| 2005 | 2005-06-14 | 2005-08-02 |
| 2006 | 2006-06-08 | 2006-07-04 |
| 2007 | 2007-07-05 | 2007-07-20 |
| 2009 | 2009-06-09 | 2009-06-10 |
| 2010 | 2010-07-25 | 2010-07-25 |
| 2011 | 2011-06-01 | 2011-06-30 |
| 2012 | 2012-06-01 | 2012-07-23 |
| 2013 | 2013-07-17 | 2013-07-26 |
| 2014 | 2014-06-24 | 2014-07-12 |
| 2015 | 2015-07-01 | 2015-07-01 |
| 2016 | 2016-06-12 | 2016-08-06 |
| 2017 | 2017-06-16 | 2017-08-04 |
| 2018 | 2018-06-07 | 2018-06-27 |
| 2025 | 2025-06-13 | 2025-07-05 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 68 | 18 | 1969 | 2 |
| 35 C (95 F): Days | 1 | 2 | 1969 | 2 |
| 90 F (32.2 C): Days | 22 | 12 | 1969 | 2 |
| 0 C (32 F): Ice days (max | 80 | 181 | 1964 | 57 |
| 0 C (32 F): Frost days (min | 81 | 237 | 1968 | 71 |
| -10 C (14 F): Days with min | 81 | 170 | 1952 | 39 |
| -20 C (-4 F): Days with min | 81 | 123 | 1952 | 15 |
| -30 C (-22 F): Days with min | 81 | 65 | 2010 | 4 |
| -40 C (-40 F): Days with min | 73 | 25 | 1947 | 11 |
| 20 C (68 F): Tropical nights (min | 11 | 2 | 2012 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 86 | 25 | 1944 | 11 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 68 | 5 | 1996 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 7 | 1 | 1938 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1938.
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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).