December weather in Diagonal, IA
The average temperature in Diagonal in December is 27.2°F (17.7°F–36.8°F). Average precipitation: 1.63 inches. Average snowfall is 4.0 inches.
December is a winter month in Diagonal, and is cooler than the annual average of 49.6°F. Daily temperatures swing about 19.1°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 9h 5m. For travel, December is cold.
Avg High
36.8°F
Avg Low
17.7°F
Precipitation
1.63 in
Snow
4.0 in
December records in Diagonal
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 64.0°F (1970) | -4.0°F (1893) | 1.10 in (1945) |
| December 2 | 63.0°F (1998) | -4.0°F (1893) | 1.09 in (2007) |
| December 3 | 64.0°F (1956) | -6.0°F (1919) | 1.38 in (1897) |
| December 4 | 64.9°F (1943) | -2.9°F (2025) | 1.27 in (1924) |
| December 5 | 66.0°F (2001) | -2.9°F (1895) | 0.75 in (1936) |
| December 6 | 69.1°F (1939) | -9.9°F (1950) | 1.27 in (1913) |
| December 7 | 60.1°F (1946) | -9.0°F (1936) | 1.35 in (1994) |
| December 8 | 70.0°F (1946) | -17.0°F (1917) | 1.90 in (1980) |
| December 9 | 63.0°F (1946) | -8.0°F (1909) | 1.00 in (1907) |
| December 10 | 64.9°F (1965) | -22.0°F (1919) | 1.00 in (1911) |
| December 11 | 63.0°F (1965) | -8.0°F (1917) | 1.45 in (2007) |
| December 12 | 60.1°F (1965) | -15.0°F (1932) | 0.55 in (1972) |
| December 13 | 64.9°F (1921) | -17.0°F (1961) | 0.81 in (1992) |
| December 14 | 61.0°F (1975) | -16.1°F (1901) | 2.90 in (2015) |
| December 15 | 63.0°F (2021) | -16.1°F (1989) | 3.40 in (2007) |
| December 16 | 70.0°F (2021) | -18.0°F (1932) | 0.40 in (1940) |
| December 17 | 64.9°F (1939) | -9.9°F (1951) | 0.70 in (1977) |
| December 18 | 60.1°F (1939) | -17.0°F (2016) | 0.77 in (2000) |
| December 19 | 55.9°F (1931) | -15.0°F (1901) | 0.64 in (2008) |
| December 20 | 60.1°F (1941) | -18.9°F (1901) | 1.00 in (1911) |
| December 21 | 61.0°F (1941) | -18.0°F (1916) | 0.90 in (2006) |
| December 22 | 66.0°F (1933) | -24.0°F (1989) | 0.44 in (1941) |
| December 23 | 62.1°F (1933) | -27.0°F (1989) | 1.25 in (1941) |
| December 24 | 60.1°F (1893) | -27.9°F (1989) | 0.88 in (1932) |
| December 25 | 61.0°F (1922) | -11.0°F (1924) | 2.60 in (2010) |
| December 26 | 62.1°F (2019) | -14.1°F (1914) | 0.90 in (1942) |
| December 27 | 66.9°F (1946) | -16.1°F (2017) | 1.14 in (2008) |
| December 28 | 68.0°F (1984) | -27.0°F (1924) | 1.41 in (1982) |
| December 29 | 66.0°F (1984) | -18.9°F (1917) | 1.22 in (2019) |
| December 30 | 63.0°F (2022) | -14.1°F (1961) | 1.56 in (1972) |
| December 31 | 64.0°F (2004) | -11.9°F (2017) | 1.10 in (1936) |