January weather in St. Marys, IA
The average temperature in St. Marys in January is 21.7°F (11.6°F–31.7°F). Average precipitation: 0.91 inches. Average snowfall is 8.5 inches.
January is a winter month in St. Marys, and is cooler than the annual average of 49.9°F. Daily temperatures swing about 20.1°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 9h 20m. For travel, January is cold.
Avg High
31.7°F
Avg Low
11.6°F
Precipitation
0.91 in
Snow
8.5 in
January records in St. Marys
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 61.0°F (1897) | -23.1°F (2018) | 1.89 in (1942) |
| January 2 | 60.1°F (1897) | -20.9°F (2018) | 1.25 in (1897) |
| January 3 | 62.1°F (2004) | -20.9°F (2010) | 2.00 in (1971) |
| January 4 | 60.1°F (1939) | -20.0°F (1942) | 1.00 in (1910) |
| January 5 | 57.0°F (1956) | -24.0°F (1924) | 1.57 in (1946) |
| January 6 | 64.9°F (2012) | -25.1°F (1971) | 0.66 in (1913) |
| January 7 | 57.0°F (2019) | -25.1°F (1912) | 0.81 in (1937) |
| January 8 | 62.1°F (2003) | -15.0°F (1942) | 0.49 in (1937) |
| January 9 | 70.0°F (2003) | -22.0°F (1974) | 1.14 in (2026) |
| January 10 | 60.1°F (2020) | -22.0°F (1982) | 0.50 in (1975) |
| January 11 | 57.0°F (2012) | -20.0°F (1918) | 0.58 in (1905) |
| January 12 | 57.0°F (1928) | -32.1°F (1912) | 2.39 in (1960) |
| January 13 | 63.0°F (1987) | -22.0°F (1916) | 0.81 in (1979) |
| January 14 | 62.1°F (1996) | -27.9°F (1982) | 0.60 in (1930) |
| January 15 | 57.0°F (1990) | -27.9°F (1979) | 0.40 in (1906) |
| January 16 | 62.1°F (1990) | -22.0°F (1982) | 0.50 in (1980) |
| January 17 | 59.0°F (1989) | -22.0°F (1930) | 1.10 in (2004) |
| January 18 | 60.1°F (1951) | -22.0°F (1930) | 0.63 in (1996) |
| January 19 | 55.9°F (2013) | -27.9°F (1970) | 0.60 in (1935) |
| January 20 | 63.0°F (1895) | -22.0°F (1970) | 1.63 in (1904) |
| January 21 | 60.1°F (1992) | -27.9°F (1970) | 0.85 in (1973) |
| January 22 | 57.0°F (1909) | -23.1°F (1930) | 0.60 in (1898) |
| January 23 | 60.1°F (1909) | -20.9°F (1936) | 0.41 in (1913) |
| January 24 | 90.0°F (1897) | -22.0°F (1894) | 0.53 in (1967) |
| January 25 | 60.1°F (1944) | -25.1°F (1894) | 1.20 in (1898) |
| January 26 | 64.0°F (1944) | -18.9°F (1904) | 1.00 in (1895) |
| January 27 | 66.0°F (2002) | -20.0°F (1902) | 1.10 in (1944) |
| January 28 | 63.0°F (2002) | -24.0°F (1977) | 0.50 in (1910) |
| January 29 | 62.1°F (2013) | -22.0°F (1966) | 0.98 in (1989) |
| January 30 | 63.0°F (1906) | -32.1°F (2019) | 0.90 in (2013) |
| January 31 | 69.1°F (1989) | -33.0°F (2019) | 0.39 in (2002) |