January weather in St. Marys, PA
The average temperature in St. Marys in January is 21.8°F (13.1°F–30.5°F). Average precipitation: 3.47 inches. Average snowfall is 17.8 inches.
January is a winter month in St. Marys, and is cooler than the annual average of 45.1°F. Daily temperatures swing about 17.4°F between overnight low and afternoon high. Expect about 19 days with precipitation. Daylight averages about 9h 19m. For travel, January is cold.
Avg High
30.5°F
Avg Low
13.1°F
Precipitation
3.47 in
Snow
17.8 in
January records in St. Marys
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 55.9°F (2019) | -17.0°F (2018) | 1.04 in (2019) |
| January 2 | 54.0°F (2022) | -17.0°F (2018) | 1.15 in (1979) |
| January 3 | 54.0°F (2004) | -9.0°F (1968) | 1.30 in (1999) |
| January 4 | 59.0°F (2023) | -9.9°F (2014) | 1.11 in (2015) |
| January 5 | 55.0°F (2007) | -9.0°F (1968) | 1.15 in (2004) |
| January 6 | 57.9°F (2007) | -9.0°F (1968) | 1.01 in (2005) |
| January 7 | 54.0°F (2007) | -17.0°F (2014) | 0.61 in (1962) |
| January 8 | 57.9°F (2008) | -17.0°F (2014) | 1.26 in (1998) |
| January 9 | 64.0°F (2008) | -11.9°F (1968) | 0.78 in (1998) |
| January 10 | 46.0°F (2006) | -13.0°F (2010) | 1.79 in (2024) |
| January 11 | 46.9°F (2020) | -13.0°F (2010) | 0.59 in (2009) |
| January 12 | 63.0°F (2020) | -13.0°F (1968) | 1.90 in (2018) |
| January 13 | 57.0°F (2018) | -14.1°F (1968) | 1.70 in (1960) |
| January 14 | 62.1°F (2013) | -11.9°F (2018) | 1.37 in (2006) |
| January 15 | 48.0°F (2007) | -14.1°F (2018) | 1.14 in (1999) |
| January 16 | 54.0°F (2007) | -9.9°F (2004) | 0.74 in (2007) |
| January 17 | 48.9°F (2023) | -15.0°F (2009) | 0.74 in (2022) |
| January 18 | 50.0°F (2012) | -17.0°F (2009) | 1.03 in (1978) |
| January 19 | 46.0°F (2023) | -4.0°F (2009) | 1.28 in (1974) |
| January 20 | 46.0°F (2006) | -6.0°F (2009) | 1.87 in (1947) |
| January 21 | 52.0°F (2006) | -9.0°F (2005) | 1.22 in (1959) |
| January 22 | 57.9°F (2017) | -16.1°F (2025) | 1.58 in (1959) |
| January 23 | 57.9°F (2017) | -17.0°F (2025) | 0.92 in (1982) |
| January 24 | 45.0°F (2009) | -20.9°F (2011) | 1.36 in (2019) |
| January 25 | 48.9°F (2010) | -20.9°F (2011) | 1.63 in (2010) |
| January 26 | 51.1°F (2024) | -16.1°F (2004) | 1.00 in (1978) |
| January 27 | 54.0°F (2024) | -7.1°F (1968) | 1.20 in (1962) |
| January 28 | 52.0°F (2012) | -16.1°F (2005) | 1.09 in (1994) |
| January 29 | 48.9°F (2006) | -16.1°F (2005) | 0.76 in (2024) |
| January 30 | 55.9°F (2013) | -11.0°F (2014) | 0.75 in (1990) |
| January 31 | 57.0°F (2013) | -14.1°F (2010) | 1.12 in (1969) |