Blenheim Weather in December
Average highs run from 18°C on December 1 to 21°C on December 31, and lows from 9°C to 10°C. Normal precipitation for the month is 68 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
- 19°C
- Average low
- 10°C
- Precipitation
- 68 mm
- Reanalysis high
- 29°CDec 21, 2015
- Reanalysis low
- 2°CDec 2, 2006
- Daylight
- 14 h 56 min to 15 h 08 min
- Cloud cover
- 68%
- Humidity
- 75%
- Dew point
- 9°C
- Wind
- 13.3 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 | 18°C | 9°C | 23°C 1995 | 4°C 2014 | 36% |
| Dec 2 | 18°C | 9°C | 25°C 1995 | 2°C 2006 | 36% |
| Dec 3 | 18°C | 9°C | 23°C 1995 | 4°C 1991 | 37% |
| Dec 4 | 18°C | 9°C | 25°C 1999 | 4°C 2004 | 36% |
| Dec 5 | 18°C | 9°C | 26°C 2017 | 5°C 1996 | 36% |
| Dec 6 | 19°C | 9°C | 24°C 2010 | 5°C 1996 | 36% |
| Dec 7 | 19°C | 9°C | 24°C 2017 | 4°C 1996 | 35% |
| Dec 8 | 19°C | 9°C | 25°C 2005 | 4°C 1999 | 35% |
| Dec 9 | 19°C | 9°C | 25°C 2018 | 4°C 1999 | 34% |
| Dec 10 | 19°C | 9°C | 23°C 2017 | 3°C 2006 | 34% |
| Dec 11 | 19°C | 9°C | 24°C 2017 | 4°C 1997 | 36% |
| Dec 12 | 19°C | 9°C | 24°C 2003 | 5°C 2004 | 37% |
| Dec 13 | 19°C | 9°C | 24°C 1998 | 5°C 1991 | 37% |
| Dec 14 | 19°C | 9°C | 26°C 2000 | 4°C 2015 | 36% |
| Dec 15 | 19°C | 9°C | 25°C 2000 | 5°C 1996 | 36% |
| Dec 16 | 19°C | 9°C | 25°C 2017 | 5°C 1996 | 35% |
| Dec 17 | 19°C | 10°C | 27°C 2017 | 5°C 1991 | 35% |
| Dec 18 | 19°C | 10°C | 25°C 2003 | 5°C 2004 | 34% |
| Dec 19 | 19°C | 10°C | 25°C 2012 | 4°C 1992 | 34% |
| Dec 20 | 19°C | 10°C | 25°C 2000 | 4°C 2004 | 34% |
| Dec 21 | 20°C | 10°C | 29°C 2015 | 3°C 1992 | 35% |
| Dec 22 | 20°C | 10°C | 22°C 1997 | 4°C 2006 | 36% |
| Dec 23 | 20°C | 10°C | 24°C 2012 | 5°C 1994 | 37% |
| Dec 24 | 20°C | 10°C | 26°C 2000 | 6°C 2016 | 37% |
| Dec 25 | 20°C | 10°C | 27°C 2012 | 5°C 1994 | 36% |
| Dec 26 | 20°C | 10°C | 25°C 2015 | 4°C 1999 | 35% |
| Dec 27 | 20°C | 10°C | 25°C 2015 | 4°C 2002 | 34% |
| Dec 28 | 20°C | 10°C | 27°C 2015 | 5°C 2020 | 34% |
| Dec 29 | 20°C | 10°C | 24°C 2009 | 7°C 2020 | 33% |
| Dec 30 | 21°C | 10°C | 27°C 2005 | 6°C 2006 | 33% |
| Dec 31 | 21°C | 10°C | 26°C 2018 | 4°C 2006 | 33% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (GMT+13).
- December 1
- sunrise 5:45 AM, sunset 8:41 PM
- December 31
- sunrise 5:53 AM, sunset 9:01 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 2026-09-25. Sun and moon: computed with the NOAA solar equations and Meeus.