United States · 1991–2020 normal
Tysons in
December.
Typical December weather in Tysons: 7.8°C by day, -1.5°C at night, 86 mm of rain over 8 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high7.8°C
Typical low-1.5°C
Rain86 mm
Wet days8
Comfort score 5 this month (September leads the year at 84). Daylight is calculated as 9 h 27 from latitude 38.92°.
Event window
Frost-level nights in December
The measured night-time normal is -1.5°C, so frost is typical rather than exceptional this month.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 4790534
- NOAA station
- USC00448737 · VIENNA
- Station distance
- 5.8 km from the place centre
- Coverage
- Strong coverage · 26 usable years
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.