Whanganui Weather in December

NASA POWER reanalysis for the half-degree grid cell around Whanganui, 1991-2020; a grid cell is an area average and can differ from a thermometer in town by several degrees

Average highs run from 18°C on December 1 to 20°C on December 31, and lows from 12°C to 14°C. Normal precipitation for the month is 82 mm over about 13 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: 13°C
Precipitation: 82 mm
Reanalysis high: 27°CDec 25, 2012
Reanalysis low: 7°CDec 21, 1992
Daylight: 14 h 46 min to 14 h 57 min
Cloud cover: 75%
Humidity: 79%
Dew point: 12°C
Wind: 22.0 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	12°C	25°C 2001	9°C 2006	42%
Dec 2	18°C	12°C	23°C 2001	7°C 2006	42%
Dec 3	18°C	12°C	23°C 2001	9°C 2014	42%
Dec 4	18°C	12°C	23°C 1995	8°C 1991	42%
Dec 5	18°C	13°C	22°C 2013	8°C 1994	41%
Dec 6	19°C	13°C	25°C 2017	9°C 2006	42%
Dec 7	19°C	13°C	23°C 2017	9°C 1999	41%
Dec 8	19°C	13°C	23°C 2017	9°C 1996	40%
Dec 9	19°C	13°C	24°C 2007	8°C 2006	39%
Dec 10	19°C	13°C	24°C 2007	7°C 2006	40%
Dec 11	19°C	13°C	23°C 2007	9°C 1997	41%
Dec 12	19°C	13°C	23°C 2005	10°C 1997	43%
Dec 13	19°C	13°C	25°C 2005	9°C 1992	43%
Dec 14	19°C	13°C	25°C 2005	8°C 1992	42%
Dec 15	19°C	13°C	22°C 2010	9°C 1991	42%
Dec 16	19°C	13°C	23°C 2001	9°C 1991	42%
Dec 17	19°C	13°C	24°C 1998	9°C 1991	43%
Dec 18	19°C	13°C	23°C 2000	9°C 2004	44%
Dec 19	19°C	13°C	23°C 2005	8°C 1992	43%
Dec 20	19°C	13°C	23°C 2012	8°C 1992	42%
Dec 21	19°C	13°C	23°C 2012	7°C 1992	43%
Dec 22	19°C	13°C	23°C 1995	9°C 2009	43%
Dec 23	19°C	13°C	24°C 2012	10°C 2006	44%
Dec 24	19°C	13°C	26°C 2012	10°C 1993	44%
Dec 25	20°C	14°C	27°C 2012	9°C 1993	43%
Dec 26	20°C	14°C	24°C 2012	10°C 1999	42%
Dec 27	20°C	14°C	24°C 2000	10°C 1999	41%
Dec 28	20°C	14°C	23°C 1998	10°C 2020	40%
Dec 29	20°C	14°C	23°C 1998	10°C 2002	39%
Dec 30	20°C	14°C	23°C 2012	10°C 2016	38%
Dec 31	20°C	14°C	23°C 2015	9°C 2009	37%

Chance of rain

Chance of a wet day

Sunrise and sunset

Times for 2026, local time (GMT+13).

December 1: sunrise 5:46 AM, sunset 8:32 PM
December 31: sunrise 5:54 AM, sunset 8:51 PM

Every day of December: sun and moon

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 2026-09-26. Sun and moon: computed with the NOAA solar equations and Meeus.