United States · 1991–2020 normal
Mercer Island in
December.
Typical December weather in Mercer Island: 8.5°C by day, 2.6°C at night, 136 mm of rain over 14.9 wet days. These are measured 1991–2020 station normals, not a forecast.
Typical high8.5°C
Typical low2.6°C
Rain136 mm
Wet days14.9
Comfort score 5 this month (July leads the year at 96). Daylight is calculated as 8 h 27 from latitude 47.57°.
The evidence behind this page
One month,
from the same station.
- Place identity
- GeoNames 5803139
- NOAA station
- USW00024234 · SEATTLE BOEING FLD
- Station distance
- 7.5 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.