Great Falls Weather Forecast
- 29
- 50
Mostly Sunny
- 36
- 58
Mostly Cloudy
- 47
- 61
Rain Likely
- 29
- 56
Sunny
- 38
- 56
Mostly Sunny
- 39
- 63
Partly Sunny
Today 16 Dec Chester
Sunny. Highs around 50. Southwest Winds around 5 Mph.
Tonight 16 Dec Chester
Mostly clear. Lows in the upper 20s. Southwest Winds around 5 Mph.
Great Falls Temperature Statistics
December Temperature
Lancaster County-mc Whirter Field (10.6 miles)
Lowest 4 December, 2025
28.4 °FAverage December
40.4 °FHighest 13 December, 2025
62.6 °F
Climate (2020–Present)
Lancaster County-mc Whirter Field (10.6 miles)
Average Low 2020–2025
51.9 °FAverage 2020–2025
62.2 °FAverage High 2020–2025
73.6 °F