December weather in New Boston, IL
The average temperature in New Boston in December is 29.3°F (21.8°F–36.7°F). Average precipitation: 1.77 inches.
December is a winter month in New Boston, and is cooler than the annual average of 51.2°F. Daily temperatures swing about 14.9°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 9h 3m. For travel, December is cold.
Avg High
36.7°F
Avg Low
21.8°F
Precipitation
1.77 in
Daylight
9h 3m
December records in New Boston
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 60.1°F (2021) | 10.0°F (2002) | 0.80 in (2006) |
| December 2 | 61.0°F (2012) | 1.0°F (1942) | 0.91 in (2018) |
| December 3 | 62.1°F (2017) | -2.0°F (1940) | 1.27 in (1982) |
| December 4 | 69.1°F (2012) | 5.0°F (2025) | 0.87 in (1947) |
| December 5 | 70.0°F (1998) | 1.9°F (2005) | 0.72 in (1999) |
| December 6 | 66.9°F (2001) | 0.0°F (2005) | 0.62 in (2004) |
| December 7 | 59.0°F (1947) | -4.0°F (2005) | 1.36 in (1994) |
| December 8 | 62.1°F (1946) | -7.1°F (2005) | 1.74 in (1980) |
| December 9 | 63.0°F (1940) | 0.0°F (2005) | 0.74 in (1977) |
| December 10 | 57.0°F (1946) | -4.0°F (2013) | 2.22 in (2003) |
| December 11 | 57.9°F (2020) | -4.0°F (1945) | 1.47 in (1970) |
| December 12 | 53.1°F (2015) | -4.0°F (2000) | 1.28 in (2020) |
| December 13 | 61.0°F (2015) | -11.0°F (2000) | 0.64 in (1946) |
| December 14 | 60.1°F (2015) | -0.9°F (2010) | 1.34 in (2015) |
| December 15 | 57.9°F (2006) | -4.0°F (2025) | 2.23 in (1971) |
| December 16 | 73.0°F (2021) | 0.0°F (1945) | 1.24 in (1940) |
| December 17 | 57.0°F (1939) | -6.0°F (1945) | 0.27 in (2008) |
| December 18 | 62.1°F (1939) | -5.1°F (2016) | 0.70 in (2002) |
| December 19 | 59.0°F (1939) | -7.1°F (2016) | 0.93 in (1957) |
| December 20 | 52.0°F (1941) | -11.0°F (2000) | 1.07 in (1952) |
| December 21 | 55.9°F (1941) | -4.0°F (2008) | 0.68 in (1949) |
| December 22 | 54.0°F (1941) | -6.0°F (2000) | 0.66 in (1949) |
| December 23 | 54.0°F (2019) | -9.0°F (2022) | 0.82 in (1979) |
| December 24 | 59.0°F (2020) | -8.0°F (2000) | 1.06 in (1965) |
| December 25 | 63.0°F (2021) | -15.0°F (2000) | 0.88 in (2009) |
| December 26 | 61.0°F (2019) | -18.0°F (2000) | 0.47 in (2016) |
| December 27 | 63.0°F (1946) | -2.0°F (2000) | 3.60 in (1942) |
| December 28 | 64.9°F (1946) | -6.0°F (2000) | 0.72 in (1959) |
| December 29 | 57.0°F (2019) | 3.0°F (2000) | 1.30 in (1948) |
| December 30 | 64.0°F (2022) | -2.9°F (2013) | 1.08 in (1971) |
| December 31 | 61.0°F (2004) | -5.1°F (1946) | 0.43 in (2024) |