January weather in Decatur, IA
The average temperature in Decatur in January is 24.3°F (15.6°F–33.1°F). Average precipitation: 1.04 inches.
January is a winter month in Decatur, and is cooler than the annual average of 51.6°F. Daily temperatures swing about 17.5°F between overnight low and afternoon high. Expect about 6 days with precipitation. Daylight averages about 9h 23m. For travel, January is cold.
Avg High
33.1°F
Avg Low
15.6°F
Precipitation
1.04 in
Daylight
9h 23m
January records in Decatur
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 57.0°F (2004) | -18.8°F (2018) | 0.26 in (2022) |
| January 2 | 61.0°F (2004) | -15.9°F (2010) | 0.33 in (2006) |
| January 3 | 59.0°F (1998) | -6.9°F (2014) | 0.51 in (2005) |
| January 4 | 55.9°F (2007) | -15.0°F (1999) | 0.20 in (2005) |
| January 5 | 63.0°F (2012) | -14.1°F (1999) | 0.36 in (2005) |
| January 6 | 55.0°F (2012) | -13.9°F (2014) | 0.29 in (2010) |
| January 7 | 64.9°F (2026) | -7.8°F (2015) | 0.36 in (2016) |
| January 8 | 66.0°F (2003) | -4.9°F (2015) | 1.10 in (2026) |
| January 9 | 61.0°F (2020) | -14.1°F (1999) | 0.49 in (2024) |
| January 10 | 54.0°F (2012) | -4.9°F (2010) | 0.77 in (2020) |
| January 11 | 53.1°F (2013) | 3.9°F (2003) | 0.34 in (2019) |
| January 12 | 53.1°F (2006) | -2.9°F (2011) | 0.46 in (2019) |
| January 13 | 53.1°F (2026) | -15.9°F (2024) | 0.32 in (2001) |
| January 14 | 54.0°F (2016) | -17.9°F (2024) | 0.55 in (2022) |
| January 15 | 57.9°F (2006) | -15.9°F (2024) | 0.34 in (2022) |
| January 16 | 59.0°F (2015) | -10.8°F (2007) | 0.74 in (2017) |
| January 17 | 51.1°F (2015) | -6.0°F (2003) | 0.74 in (2020) |
| January 18 | 55.9°F (2013) | -5.8°F (2008) | 0.78 in (2023) |
| January 19 | 55.9°F (2013) | -12.8°F (2008) | 0.35 in (2016) |
| January 20 | 50.0°F (2018) | -14.8°F (2024) | 0.38 in (2010) |
| January 21 | 54.0°F (2018) | -13.9°F (2025) | 0.91 in (2018) |
| January 22 | 59.0°F (2002) | -2.0°F (2003) | 0.42 in (2019) |
| January 23 | 54.0°F (2004) | -11.0°F (2003) | 0.20 in (2024) |
| January 24 | 55.0°F (2015) | -12.8°F (2008) | 0.25 in (2020) |
| January 25 | 57.9°F (2002) | -6.9°F (2019) | 0.80 in (2021) |
| January 26 | 64.9°F (2002) | -8.0°F (2026) | 0.12 in (2001) |
| January 27 | 64.9°F (2002) | -4.0°F (2004) | 0.37 in (2013) |
| January 28 | 60.1°F (2013) | -3.8°F (2014) | 0.35 in (2001) |
| January 29 | 62.1°F (2013) | -8.9°F (2019) | 0.75 in (2001) |
| January 30 | 63.0°F (2012) | -19.8°F (2019) | 0.54 in (2021) |
| January 31 | 62.1°F (2009) | -9.8°F (2019) | 0.94 in (2015) |