A typical December based on the past 10 years of my records (2009 to 2018);

  • An average temperature of 16.3C
    • Maximum temperature expected about 32C.
    • Minimum temperature expected about 5C.
    • No days fail to reach 10C.
    • Thirty days are expected to reach or exceed 15C.
    • Twenty days are expected to reach or exceed 20C.
    • Nine days are expected to reach or exceed 25C.
    • Two day is expected to reach or exceed 30C.
  • Wind run would be around 5300km with the windiest day expected to have a wind run of 300km.
    • Maximum wind gust would be in the region of 50km/h.
  • There would be rain on 10 days with the monthly total of around 50mm.
    • Maximum daily rainfall is expected to be around 20mm

Rain totals for the month and year along with temperature and wind comparisons can be found here.

December Daily Observations
TemperatureWindRainfallBarometer
DateMinMaxMeanMean
(Km/h)
Gust
(Km/h)
Run (km)Prevailing Dir10 Minute Max (mm)Total (mm)Min (hPa)Max (hPa)Change (hPa)
1 11.4 27.5 19.1 6.9 36 158 East Nth East 0 0 993.3 1006.8 -13.5
Mostly cloudy with some sunny intervals in the afternoon. NE winds turning northerly in the afternoon and dying away in the evening.
More heatwaves on the way for summer - Niwa
2 11.8 26.1 19.2 4.9 29 111 East Nth East 0 0 991.5 1002.1 -10.6
Overcast with NE winds, a few spots of rain in the afternoon.
3 15.4 26.1 21.0 12,8 48 292 East Nth East 0 0 980.3 993.2 +12.9
Variable cloud, NE winds turning gusty NW from mid afternoon.
4 11.1 27.2 19.1 8.9 44 204 North Nth East 0 0 989.4 997.4 +8.0
Some high cloud but mostly sunny with fresh northerly winds.
Rangitata River on watch after heavy rainfall
November's 'unsettled' weather brought record-breaking heat
5 9.9 26.1 18.3 8.0 43 183 North Nth East 0 0 995.7 1000.7 +5.0
Some high cloud, sunny with warm northerly winds.
Central Otago and West Coast on flood watch as rain keeps coming
Smoke and dust from Australia's bushfires turns New Zealand's glaciers pink
6 12.4 27.2 20.2 7.6 44 174 East Nth East 0 0 998.5 1002.2 +3.7
Mostly sunny with variable cloud with north to NE winds.
Rivers dry out as temperatures soar towards 30C in Hawke's Bay
Australian bush fires: More haze for New Zealand this weekend
7 14.4 28.2 20.9 7.9 48 181 East Nth East 0 0 998.1 1003.8 +5.7
Morning cloud and smoke from the Australian bush files. A few spots of rain around midday them cloud breaking and haze clearing with warm NE to north winds.
Wild weather: Dramatic footage shows massive landslide into flooded Rangitata River
Thunderstorm watch: 100,000 lightning strikes across the country
8 10.9 26.7 18.6 7.8 40 178 North Nth West 0 0 997.0 1005.0 +8.0
Variable cloud but mostly sunny in the afternoon with northerly winds.
Weather hell: Highways closed, internet down as storm batters nation
9 5.1 23.2 14.6 4.7 32 106 East Nth East 0 0 1005.4 1019.7 +14.3
Cool start to the day, sunny with southerly winds turning NE from mid afternoon.
Hundreds of tourists evacuated in major airlift after floods and slips close roads
Rangitata River flooding damages nine Transpower pylons
10 8.0 19.3 14.4 8.5 34 192 East Nth East 0 0 1014.8 1019.6 -4.8
Morning cloud breaking to sunny with NE winds
Rangitata River flood risk set to remain for months
'Substantial disruption': Crucial bridge reopens, work continues to restore access on West Coast
11 13.0 26.6 18.6 6.3 33 144 East Nth East 0 0 1011.1 1016.4 +5.3
Variable cloud, light NE winds during the day.
Oz fires blow high levels of carbon monoxide over NZ
12 11.4 20.6 15.8 8.4 44 191 East Nth East 0 0 1008.0 1016.2 -8.2
Morning cloud breaking to a sunny afternoon with NE winds freshening.
13 13.1 26.6 17.3 10.7 38 245 East Nth East 0 0 992.3 1007.8 -15.5
Overcast with NE winds easing during the afternoon. Cloud breaking late afternoon with a warmer northerly change. Maximum temperature recorded at 6:30pm.
14 12.3 21.7 16.4 9.3 37 212 East Nth East 0 0 996.8 1004.9 +8.1
Morning cloud breaking to a sunny afternoon with fresh NE winds.
15 9.6 27.2 17.7 6.1 35 139 East Nth East 0 0 999.3 1006.7 +7.4
Variable cloud with a few spots of rain in a southerly change in the evening.
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