Caerphilly Weather in December
Average highs run from 9°C on December 1 to 7°C on December 31, and lows from 5°C to 3°C. Normal precipitation for the month is 105 mm over about 16 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
- 8°C
- Average low
- 4°C
- Precipitation
- 105 mm
- Reanalysis high
- 13°CDec 19, 2015
- Reanalysis low
- -6°CDec 7, 2010
- Daylight
- 8 h 11 min to 7 h 54 min
- Cloud cover
- 79%
- Humidity
- 93%
- Dew point
- 5°C
- Wind
- 22.3 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 | 9°C | 5°C | 13°C 2001 | -1°C 2010 | 56% |
| Dec 2 | 9°C | 4°C | 13°C 2018 | -2°C 2010 | 54% |
| Dec 3 | 9°C | 4°C | 12°C 1995 | -3°C 2010 | 52% |
| Dec 4 | 8°C | 4°C | 13°C 2006 | 0°C 2016 | 51% |
| Dec 5 | 8°C | 4°C | 13°C 2007 | -2°C 1995 | 50% |
| Dec 6 | 8°C | 4°C | 13°C 2007 | -4°C 2010 | 50% |
| Dec 7 | 8°C | 4°C | 13°C 2015 | -6°C 2010 | 49% |
| Dec 8 | 8°C | 4°C | 13°C 2016 | -3°C 2010 | 50% |
| Dec 9 | 8°C | 4°C | 12°C 2016 | -3°C 2010 | 51% |
| Dec 10 | 8°C | 4°C | 13°C 1994 | -3°C 1991 | 51% |
| Dec 11 | 8°C | 4°C | 12°C 1994 | -4°C 1991 | 52% |
| Dec 12 | 8°C | 4°C | 13°C 1994 | -2°C 1991 | 52% |
| Dec 13 | 8°C | 4°C | 12°C 2016 | -2°C 1996 | 53% |
| Dec 14 | 8°C | 4°C | 13°C 1998 | -2°C 1996 | 54% |
| Dec 15 | 8°C | 4°C | 12°C 2015 | -1°C 2001 | 53% |
| Dec 16 | 8°C | 4°C | 13°C 2015 | -2°C 1997 | 52% |
| Dec 17 | 8°C | 4°C | 12°C 2015 | -2°C 1997 | 54% |
| Dec 18 | 8°C | 4°C | 12°C 2015 | -3°C 2010 | 55% |
| Dec 19 | 8°C | 4°C | 13°C 2015 | -3°C 1999 | 56% |
| Dec 20 | 8°C | 4°C | 12°C 2015 | -4°C 1999 | 57% |
| Dec 21 | 7°C | 4°C | 12°C 2020 | -2°C 2010 | 56% |
| Dec 22 | 7°C | 3°C | 13°C 2015 | -3°C 2010 | 58% |
| Dec 23 | 7°C | 3°C | 12°C 2012 | -3°C 2010 | 57% |
| Dec 24 | 7°C | 3°C | 13°C 1997 | -4°C 2010 | 57% |
| Dec 25 | 7°C | 3°C | 13°C 2015 | -4°C 2010 | 56% |
| Dec 26 | 7°C | 3°C | 13°C 2015 | -3°C 2010 | 55% |
| Dec 27 | 7°C | 3°C | 13°C 2015 | -3°C 1995 | 55% |
| Dec 28 | 7°C | 3°C | 13°C 1994 | -4°C 1995 | 55% |
| Dec 29 | 7°C | 3°C | 13°C 2006 | -5°C 1995 | 55% |
| Dec 30 | 7°C | 3°C | 13°C 2006 | -2°C 1995 | 56% |
| Dec 31 | 7°C | 3°C | 12°C 2017 | -5°C 1996 | 56% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT).
- December 1
- sunrise 7:56 AM, sunset 4:07 PM
- December 31
- sunrise 8:19 AM, sunset 4:13 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 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.