Jefferson County, CO
Tuesday : a low of 48.6°F averaged over Jefferson County, CO, the warmest 29 September night in the county average since 2015, tied 1st warmest of 76 (with 2015) (county average from NOAA gridded data, 1951 to 2026).
Last updated . This page normally updates every day; the latest update is late.
- Tuesday 29 September 2026: a high of 66.6°F averaged over Jefferson County, CO, the coldest 29 September day in the county average since 2020, 27th coldest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Tuesday 29 September 2026: 0.01 in of precipitation averaged over Jefferson County, CO, the wettest 29 September in the county average since 2025, tied 18th wettest of 76 (with 2025 and 1961) (county average from NOAA gridded data, 1951 to 2026).
The month
- September 2026 so far averaged 63°F in Jefferson County, CO, the warmest 1 to 29 September in the county average since the data begin in 1951 (county average from NOAA gridded data, 1951 to 2026).
- August 2026 averaged 69.5°F in Jefferson County, CO, the warmest August in the county average since the data begin in 1895 (county average from NOAA's monthly county data, 1895 to 2026).
- Days of the month without a value
- 0
Every year on this date
- Above the normal range
- In it
- Below it
- Normal range
- This year and the extreme
Every year as a table
| Year | High, °F | Low, °F |
|---|---|---|
| 2026 | 66.6 | 48.6 |
| 2025 | 71.9 | 44.3 |
| 2024 | 79.9 | 47.1 |
| 2023 | 80.5 | 44.2 |
| 2022 | 75.7 | 46.7 |
| 2021 | 71.7 | 46 |
| 2020 | 57.1 | 31.9 |
| 2019 | 70.3 | 43.4 |
| 2018 | 59.1 | 34.6 |
| 2017 | 54.5 | 39.3 |
| 2016 | 75.1 | 41.5 |
| 2015 | 77.5 | 48.6 |
| 2014 | 67.9 | 45.5 |
| 2013 | 63.2 | 33.4 |
| 2012 | 65.7 | 38.7 |
| 2011 | 79.8 | 44.4 |
| 2010 | 83.6 | 45.9 |
| 2009 | 65.9 | 34.7 |
| 2008 | 76.4 | 38.9 |
| 2007 | 72.6 | 43 |
| 2006 | 72.6 | 35.7 |
| 2005 | 52.3 | 37.2 |
| 2004 | 61.1 | 38.9 |
| 2003 | 66.8 | 34 |
| 2002 | 64.6 | 39.4 |
| 2001 | 79.6 | 46.5 |
| 2000 | 73.6 | 41.5 |
| 1999 | 40.9 | 23.4 |
| 1998 | 79.6 | 44.8 |
| 1997 | 73 | 38.7 |
| 1996 | 68.6 | 36.9 |
| 1995 | 65.9 | 42 |
| 1994 | 80.2 | 40.4 |
| 1993 | 70.1 | 36.9 |
| 1992 | 71 | 36.9 |
| 1991 | 76 | 43.1 |
| 1990 | 56.5 | 44.3 |
| 1989 | 77 | 44 |
| 1988 | 55.2 | 29.3 |
| 1987 | 64 | 34.1 |
| 1986 | 62.8 | 36.4 |
| 1985 | 35.9 | 16.9 |
| 1984 | 34.2 | 24.3 |
| 1983 | 69.9 | 42.7 |
| 1982 | 62.3 | 37.2 |
| 1981 | 80.2 | 44.2 |
| 1980 | 78.2 | 41.3 |
| 1979 | 73.8 | 39.9 |
| 1978 | 76.9 | 41.5 |
| 1977 | 77.4 | 44 |
| 1976 | 62.1 | 32.7 |
| 1975 | 68.5 | 33.3 |
| 1974 | 64.4 | 30.7 |
| 1973 | 49.9 | 36.2 |
| 1972 | 63.1 | 36.1 |
| 1971 | 64.9 | 35.1 |
| 1970 | 68.2 | 38 |
| 1969 | 78.2 | 42.2 |
| 1968 | 65 | 41.2 |
| 1967 | 76.8 | 39.2 |
| 1966 | 74.2 | 41.3 |
| 1965 | 57.7 | 37.6 |
| 1964 | 71.1 | 37.2 |
| 1963 | 72.4 | 37.4 |
| 1962 | 67.1 | 42.9 |
| 1961 | 67.3 | 35.8 |
| 1960 | 68.8 | 39.4 |
| 1959 | 42.6 | 28 |
| 1958 | 72.8 | 41.6 |
| 1957 | 80.6 | 42.6 |
| 1956 | 72.7 | 42.9 |
| 1955 | 72.9 | 36.7 |
| 1954 | 70.3 | 38.1 |
| 1953 | 74.3 | 45.2 |
| 1952 | 74.5 | 43.8 |
| 1951 | 69 | 39 |
Nearby
Denver, CO 36.3 mi, the nearest city with its own station