United States · 1991–2020 normal
Rock Falls in
December.
Typical December weather in Rock Falls: 1.7°C by day, -6.9°C at night, 53 mm of rain over 6.9 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high1.7°C
Typical low-6.9°C
Rain53 mm
Wet days6.9
Comfort score 5 this month (September leads the year at 81). Daylight is calculated as 9 h 09 from latitude 41.78°.
Event window
Frost-level nights in December
The measured night-time normal is -6.9°C, so frost is typical rather than exceptional this month.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 4907898
- NOAA station
- USC00112348 · DIXON WWTP
- Station distance
- 15.8 km from the place centre
- Coverage
- Strong coverage · 25 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.