Greystones Weather in December
Average highs run from 9°C on December 1 to 7°C on December 31, and lows from 5°C to 4°C. Normal precipitation for the month is 112 mm over about 19 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
- 5°C
- Precipitation
- 112 mm
- Reanalysis high
- 14°CDec 10, 1994
- Reanalysis low
- -2°CDec 3, 2010
- Daylight
- 7 h 56 min to 7 h 38 min
- Cloud cover
- 80%
- Humidity
- 92%
- Dew point
- 5°C
- Wind
- 25.9 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 | 12°C 2015 | 1°C 2010 | 66% |
| Dec 2 | 9°C | 5°C | 13°C 1995 | -1°C 2010 | 65% |
| Dec 3 | 9°C | 5°C | 12°C 1994 | -2°C 2010 | 63% |
| Dec 4 | 9°C | 5°C | 13°C 2007 | 0°C 2010 | 63% |
| Dec 5 | 9°C | 5°C | 12°C 2007 | 0°C 2010 | 62% |
| Dec 6 | 8°C | 5°C | 13°C 2007 | -1°C 2010 | 61% |
| Dec 7 | 8°C | 5°C | 13°C 2016 | 0°C 2010 | 61% |
| Dec 8 | 8°C | 5°C | 12°C 2007 | -1°C 2010 | 61% |
| Dec 9 | 8°C | 5°C | 12°C 2016 | 0°C 2010 | 62% |
| Dec 10 | 8°C | 5°C | 14°C 1994 | 0°C 2017 | 62% |
| Dec 11 | 8°C | 5°C | 13°C 1994 | 0°C 2017 | 62% |
| Dec 12 | 8°C | 5°C | 12°C 2013 | 1°C 2017 | 61% |
| Dec 13 | 8°C | 5°C | 12°C 1998 | 0°C 1996 | 62% |
| Dec 14 | 8°C | 5°C | 12°C 1998 | 0°C 1996 | 62% |
| Dec 15 | 8°C | 5°C | 12°C 2013 | 2°C 2000 | 61% |
| Dec 16 | 8°C | 5°C | 12°C 2015 | 0°C 2010 | 60% |
| Dec 17 | 8°C | 5°C | 12°C 2015 | -1°C 2010 | 61% |
| Dec 18 | 8°C | 4°C | 13°C 2015 | -1°C 2010 | 61% |
| Dec 19 | 8°C | 4°C | 13°C 2015 | -1°C 2010 | 61% |
| Dec 20 | 8°C | 4°C | 11°C 2008 | -2°C 2010 | 61% |
| Dec 21 | 8°C | 4°C | 12°C 1991 | -2°C 2010 | 61% |
| Dec 22 | 8°C | 4°C | 12°C 2015 | -1°C 2010 | 62% |
| Dec 23 | 8°C | 4°C | 12°C 1991 | 0°C 2010 | 62% |
| Dec 24 | 8°C | 4°C | 11°C 1997 | -1°C 2010 | 62% |
| Dec 25 | 8°C | 4°C | 12°C 2011 | 0°C 2010 | 62% |
| Dec 26 | 8°C | 4°C | 11°C 2015 | 0°C 1995 | 62% |
| Dec 27 | 8°C | 4°C | 11°C 1994 | -1°C 2000 | 62% |
| Dec 28 | 8°C | 4°C | 12°C 1994 | -1°C 2000 | 62% |
| Dec 29 | 8°C | 4°C | 12°C 2006 | 0°C 1996 | 62% |
| Dec 30 | 7°C | 4°C | 12°C 2015 | 0°C 2000 | 62% |
| Dec 31 | 7°C | 4°C | 11°C 2011 | 1°C 1996 | 63% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT).
- December 1
- sunrise 8:15 AM, sunset 4:11 PM
- December 31
- sunrise 8:38 AM, sunset 4:16 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.