Jefferson County, IA
: September 2026 so far averaged 71.1°F in Jefferson County, IA, 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).
Last updated . This page normally updates every day; the latest update is late.
- Tuesday 29 September 2026: a high of 78.2°F averaged over Jefferson County, IA, the warmest 29 September in the county average since 2025, 18th warmest of 76 (county average from NOAA gridded data, 1951 to 2026).
- Tuesday 29 September 2026: a low of 51.4°F averaged over Jefferson County, IA, the warmest 29 September night in the county average since 2025, tied 26th warmest of 76 (with 1990) (county average from NOAA gridded data, 1951 to 2026).
- No measurable precipitation in the county average of Jefferson County, IA for 1 day to Tuesday 29 September 2026 (county average from NOAA gridded data, 1951 to 2026).
The month
- August 2026 averaged 73°F in Jefferson County, IA, the coldest August in the county average since 2025, tied 60th coldest of 132 (with 1958, 1924 and 1910) (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 | 78.2 | 51.4 |
| 2025 | 86.5 | 56 |
| 2024 | 82.6 | 55.1 |
| 2023 | 75.4 | 57.8 |
| 2022 | 62.8 | 35.3 |
| 2021 | 84.3 | 58.8 |
| 2020 | 60.8 | 46 |
| 2019 | 63.6 | 55.9 |
| 2018 | 52.4 | 42.5 |
| 2017 | 74.5 | 44.9 |
| 2016 | 64.2 | 48.4 |
| 2015 | 81.4 | 57.8 |
| 2014 | 82 | 54.5 |
| 2013 | 71.8 | 43.6 |
| 2012 | 72.2 | 39.2 |
| 2011 | 72.5 | 53.1 |
| 2010 | 74.5 | 47.9 |
| 2009 | 63.2 | 45.6 |
| 2008 | 75 | 56.2 |
| 2007 | 76.6 | 48.6 |
| 2006 | 62.2 | 42.4 |
| 2005 | 64.3 | 38.3 |
| 2004 | 69.1 | 39.8 |
| 2003 | 57.2 | 33.9 |
| 2002 | 80.6 | 50.7 |
| 2001 | 68.1 | 41.9 |
| 2000 | 74.5 | 48.9 |
| 1999 | 58.9 | 43.8 |
| 1998 | 81.2 | 59.5 |
| 1997 | 76.5 | 53.9 |
| 1996 | 67.7 | 45.9 |
| 1995 | 79 | 50 |
| 1994 | 71.8 | 43.4 |
| 1993 | 66 | 36.7 |
| 1992 | 59.5 | 37.1 |
| 1991 | 71.7 | 41.7 |
| 1990 | 74.9 | 51.4 |
| 1989 | 75.7 | 41.1 |
| 1988 | 73.9 | 60.6 |
| 1987 | 73.9 | 54.6 |
| 1986 | 81.1 | 63.5 |
| 1985 | 64.7 | 48.3 |
| 1984 | 55.3 | 30.3 |
| 1983 | 83.7 | 57.1 |
| 1982 | 79.3 | 57.1 |
| 1981 | 68.8 | 41.5 |
| 1980 | 75.7 | 46.3 |
| 1979 | 84.2 | 53.7 |
| 1978 | 69 | 42.6 |
| 1977 | 72.3 | 47.7 |
| 1976 | 61.6 | 50.3 |
| 1975 | 64.9 | 48.4 |
| 1974 | 65.8 | 40.5 |
| 1973 | 73.6 | 60.9 |
| 1972 | 73.3 | 41 |
| 1971 | 87.4 | 61.8 |
| 1970 | 72.2 | 41.6 |
| 1969 | 76 | 49.1 |
| 1968 | 69 | 49.1 |
| 1967 | 57.9 | 33.3 |
| 1966 | 68.6 | 47.6 |
| 1965 | 76.2 | 54.7 |
| 1964 | 64.8 | 35.9 |
| 1963 | 77.1 | 46.4 |
| 1962 | 69.1 | 38.2 |
| 1961 | 62.8 | 36.2 |
| 1960 | 70.2 | 45.4 |
| 1959 | 65.2 | 44 |
| 1958 | 70.9 | 43.1 |
| 1957 | 68.4 | 34.3 |
| 1956 | 83 | 53.1 |
| 1955 | 78 | 54.3 |
| 1954 | 80 | 61.6 |
| 1953 | 97 | 61.1 |
| 1952 | 86.8 | 53.9 |
| 1951 | 58.9 | 34.8 |
Nearby
Burlington, IA 46.8 mi, the nearest city with its own station