Grignon Weather in December
Average highs run from 3°C on December 1 to 1°C on December 31, and lows from -4°C to -6°C. Normal precipitation for the month is 100 mm over about 12 wet days.
December day by day
The normal high and low for each date, in °C.
- Normal low
- Normal high
- Reanalysis extreme high
- Reanalysis extreme low
December at a glance
- Average high
- 2°C
- Average low
- -5°C
- Precipitation
- 100 mm
- Reanalysis high
- 11°CDec 5, 2006
- Reanalysis low
- -18°CDec 17, 2007
- Daylight
- 8 h 57 min to 8 h 45 min
- Cloud cover
- 68%
- Humidity
- 83%
- Dew point
- -5°C
- Wind
- 6.1 km/h
Every day of the month
A wet day has at least 1 mm of precipitation in the reanalysis.
| Date | Normal high | Normal low | Reanalysis high | Reanalysis low | Chance wet |
|---|---|---|---|---|---|
| Dec 1 | 3°C | -4°C | 9°C 2011 | -12°C 2013 | 41% |
| Dec 2 | 3°C | -4°C | 9°C 2015 | -14°C 2012 | 43% |
| Dec 3 | 3°C | -4°C | 9°C 2006 | -16°C 2010 | 43% |
| Dec 4 | 3°C | -4°C | 9°C 1993 | -14°C 2010 | 43% |
| Dec 5 | 3°C | -5°C | 11°C 2006 | -10°C 1998 | 42% |
| Dec 6 | 3°C | -5°C | 7°C 2015 | -14°C 2012 | 42% |
| Dec 7 | 3°C | -5°C | 8°C 2015 | -13°C 2012 | 41% |
| Dec 8 | 2°C | -5°C | 8°C 2016 | -16°C 1998 | 41% |
| Dec 9 | 2°C | -5°C | 9°C 2016 | -14°C 2012 | 41% |
| Dec 10 | 2°C | -5°C | 10°C 2016 | -14°C 2005 | 41% |
| Dec 11 | 2°C | -5°C | 9°C 2000 | -17°C 2012 | 40% |
| Dec 12 | 2°C | -5°C | 10°C 1994 | -16°C 2012 | 40% |
| Dec 13 | 2°C | -5°C | 10°C 1994 | -12°C 2012 | 42% |
| Dec 14 | 2°C | -5°C | 7°C 2016 | -13°C 2009 | 41% |
| Dec 15 | 2°C | -5°C | 9°C 1998 | -17°C 2007 | 41% |
| Dec 16 | 2°C | -5°C | 8°C 2015 | -16°C 2007 | 40% |
| Dec 17 | 2°C | -5°C | 10°C 2015 | -18°C 2007 | 38% |
| Dec 18 | 2°C | -5°C | 10°C 2015 | -15°C 2010 | 38% |
| Dec 19 | 2°C | -6°C | 10°C 2015 | -16°C 2009 | 38% |
| Dec 20 | 2°C | -6°C | 10°C 2015 | -18°C 2009 | 38% |
| Dec 21 | 1°C | -6°C | 6°C 2013 | -16°C 1999 | 40% |
| Dec 22 | 1°C | -6°C | 8°C 2015 | -13°C 2004 | 39% |
| Dec 23 | 1°C | -6°C | 9°C 2014 | -14°C 2001 | 39% |
| Dec 24 | 1°C | -6°C | 8°C 2015 | -14°C 2001 | 39% |
| Dec 25 | 1°C | -6°C | 9°C 2015 | -13°C 2010 | 40% |
| Dec 26 | 1°C | -6°C | 9°C 2015 | -16°C 2010 | 41% |
| Dec 27 | 1°C | -6°C | 10°C 2015 | -15°C 1993 | 42% |
| Dec 28 | 1°C | -6°C | 9°C 2015 | -16°C 2005 | 41% |
| Dec 29 | 1°C | -6°C | 6°C 2015 | -17°C 2005 | 41% |
| Dec 30 | 1°C | -6°C | 7°C 2015 | -17°C 2005 | 40% |
| Dec 31 | 1°C | -6°C | 7°C 2006 | -17°C 2001 | 41% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+1).
- December 1
- sunrise 7:55 AM, sunset 4:52 PM
- December 31
- sunrise 8:15 AM, sunset 5:00 PM
Other months
Sources
Cloud, humidity, wind and sunshine, and temperature and precipitation: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-29. Sun and moon: computed with the NOAA solar equations and Meeus.