United States · 1991–2020 normal
Mercersburg in
December.
Typical December weather in Mercersburg: 6.4°C by day, -1.6°C at night, 76 mm of rain over 7.3 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high6.4°C
Typical low-1.6°C
Rain76 mm
Wet days7.3
Comfort score 5 this month (September leads the year at 82). Daylight is calculated as 9 h 22 from latitude 39.83°.
Event window
Frost-level nights in December
The measured night-time normal is -1.6°C, so frost is typical rather than exceptional this month.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 4559600
- NOAA station
- USW00093706 · HAGERSTOWN RGNL AP
- Station distance
- 20.1 km from the place centre
- Coverage
- Good coverage · 23 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.