December Summary
Below average temperature, 127% of expected rainfall.
(December compared to my records from the past 10 years.)
- This December was below my average temperature of 16.5C with 15.9C
- The coldest temperature was 3.6C, lower than my average minimum of 5.1C.
- Twenty Three days reached or exceeded 20C, my average is 21.
- Thirteen days reached or exceeded 25C, my average is 9.
- Two days reached or exceeded 30C, my average is 2.
- One day reached or exceeded 35C, my average is 0 though 2017 and 2010 had 1 December day that also reached or exceeded 35C.
- Wind run was 95% of my average of 5388km with 5103km.
- The barometer recorded average pressure for the month with 1010.8hPa. My average is 1010.9hPa.
- Rainfall was 127% of the average expected total of 48mm with 61mm,
- The driest December in the past 10 years is 2014 which had 26mm.
- The wettest December in the past 10 years is 2013 with 70.5mm.
- The driest December in my records is 2003 with just 2mm.
- 2020 was 261mm below the expected average rainfall for the year.
December 2020 Summary Temperature | |
---|---|
Mean | 15.9 C |
Mean Maximum | 23.4 C |
Mean Minimum | 10.3 C |
Maximum High | 35.2 C (19th) |
Maximum Low | 15.7 C (8th) |
Minimum High | 15.8 C (21st) |
Minimum Low | 3.6 C (28th) |
Wind Speed and Direction | |
Maximum Gust | 66 km/h (11th) |
Mean | 7.2 km/h |
Wind Run | 5103 km |
Max Daily Windrun | 254 km (7th) |
Prevailing Direction | East North East |
Barometer | |
Maximum | 1027.8 hPa (14th) |
Minimum | 987.2 hPa (24th) |
Mean | 1010.8 hPa |
Max Daily Change | -20.6 hPa (2nd) |
Rainfall | |
Days with Measured Rainfall (0.2mm or more) |
10 |
Max Daily Rainfall | 18.0 mm (27th) |
Monthly Rainfall | 61.0 mm |
Humidity | |
Maximum | 95 % (22nd) |
Minimum | 23 % (3rd) |
December Daily Observations | ||||||||||||
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Temperature | Wind | Rainfall | Barometer | |||||||||
Date | Min | Max | Mean | Mean (Km/h) | Gust (Km/h) | Run (km) | Prevailing Dir | 10 Minute Max (mm) | Total (mm) | Min (hPa) | Max (hPa) | Change (hPa) |
1 | 8.4 | 22.2 | 13.2 | 9.3 | 38 | 212 | South Sth West | 0 | 0 | 1009.2 | 1019.5 | +10.3 |
Few spots of rain in the morning. Cloud breaking to a mostly sunny afternoon with southerly winds turning NE. Climate crisis: Thousands of NZ homes risk pulled insurance cover |
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2 | 10.3 | 27.0 | 16.7 | 10.3 | 57 | 234 | East Nth East | 0 | 0 | 998.4 | 1019.0 | -20.6 |
Overcast in the morning. Cloud breaking during the afternoon with gusty warm northerly winds in the evening. | ||||||||||||
3 | 8.6 | 27.9 | 17.2 | 7.9 | 37 | 181 | East Nth East | 0 | 0 | 997.3 | 1007.7 | +10.4 |
Few clouds, light north to NW winds in the morning turning fresh cooler NE in the afternoon. | ||||||||||||
4 | 6.5 | 26.6 | 16.1 | 5.2 | 39 | 112 | North Nth West | 0 | 0 | 1000.2 | 1007.8 | -7.6 |
Morning cloud breaking to a sunny afternoon with warm northerly winds. | ||||||||||||
5 | 7.9 | 25.4 | 15.3 | 6.0 | 45 | 136 | East Nth East | 2.8 | 4.0 | 992.7 | 1004.3 | +11.6 |
Variable cloud, a few spots of rain early afternoon. Evening thunderstorm with a brief heavy shower and southerly winds. | ||||||||||||
6 | 6.7 | 19.9 | 12.9 | 7.5 | 38 | 172 | East Nth East | 0 | 0 | 998.8 | 1008.6 | -9.8 |
Cloud increasing from morning with NE winds freshening in the afternoon. | ||||||||||||
7 | 14.3 | 30.9 | 22.9 | 11.2 | 43 | 254 | North Nth West | 0 | 0 | 993.2 | 1000.7 | +7.5 |
Sunny fir much of the day with warm northerly winds. Overcast with high cloud later in the afternoon. | ||||||||||||
8 | 15.7 | 29.3 | 21.8 | 8.3 | 50 | 190 | North Nrh West | 0 | 0 | 995.7 | 1003.3 | +7.5 |
Overcast with high cloud and warm northerly winds. New Zealand's fifth warmest spring on record in 2020, and Wellington's wettest |
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9 | 12.1 | 26.3 | 18.0 | 5.0 | 27 | 113 | East Nth East | 0 | 0 | 1002.4 | 1006.7 | -4.3 |
Morning cloud breaking, mostly sunny in the afternoon, NE wind. | ||||||||||||
10 | 12.9 | 25.4 | 17.2 | 8.1 | 30 | 184 | East Nth East | 0 | 0 | 1002.0 | 1005.1 | -3.1 |
Morning cloud breaking and clearing in the afternoon. West to SW wind turning NE mid afternoon. | ||||||||||||
11 | 10.1 | 24.9 | 15.7 | 9.1 | 66 | 209 | South Sth West | 0 | 0 | 997.2 | 1005.1 | +7.9 |
Morning northerly winds turning strong southerly in the afternoon with cloud but remaining dry. Cloud clearing and winds easing later in the afternoon. Maximum temperature recorded at 9:30am. | ||||||||||||
12 | 8.3 | 23.8 | 14.8 | 7.0 | 34 | 159 | South Sth West | 0 | 0 | 1004.8 | 1014.7 | +9.9 |
Morning cloud breaking so a sunny day with light southerly winds turning fresher NE in the afternoon. | ||||||||||||
13 | 7.4 | 18.9 | 13.3 | 7.1 | 39 | 163 | South Sth West | 0 | 0 | 1015.0 | 1025.8 | +10.8 |
Partly cloudy, cool southerly wind. | ||||||||||||
14 | 9.2 | 23.7 | 15.1 | 3.1 | 21 | 90 | East Nth East | 0 | 0 | 1025.2 | 1027.8 | +2.6 |
Morning cloud clearing to a sunny and mild afternoon with light southerly winds turning NE. | ||||||||||||
15 | 8.7 | 25.5 | 17.8 | 6.7 | 32 | 154 | East Nth East | 0 | 0 | 1015.5 | 1027.5 | -12.0 |
Morning cloud clearing to a sunny day with a NE wind. | ||||||||||||
16 | 11.8 | 27.1 | 17.6 | 9.7 | 33 | 222 | West | 0 | 0 | 1013.2 | 1016.3 | -3.1 |
Low cloud and mist in the morning clearing. High cloud increasing during the afternoon with winds turning NE. | ||||||||||||
17 | 12.4 | 20.4 | 14.9 | 6.6 | 29 | 150 | East Nth East | 0 | 0 | 1015.1 | 1023.4 | +8.3 |
Overcast with drizzle at times, NE wind. | ||||||||||||
18 | 12.3 | 21.8 | 16.6 | 10.8 | 42 | 246 | East Nth East | 0 | 0 | 1010.0 | 1022.5 | -12.5 |
Drizzle clearing by dawn. Cloud breaking by late morning to a sunny afternoon with a fresh NE wind. | ||||||||||||
19 | 11.5 | 35.2 | 22.6 | 3.9 | 32 | 89 | north Nth West | 0 | 0 | 1006.6 | 1010.5 | -3.9 |
Sunny morning, high cloud increasing from midday, mostly light warm northerly winds. | ||||||||||||
20 | 12.2 | 19.8 | 16.8 | 7.6 | 37 | 134 | South Sth West | 0.4 | 1.4 | 1009.3 | 1022.8 | +13.3 |
Cloudy with southerly winds. Winds easing later in the afternoon with a few spots of rain. Showers in the evening. | ||||||||||||
21 | 11.7 | 15.8 | 13.4 | 7.5 | 34 | 172 | East Nth East | 1.2 | 7.6 | 1012.0 | 1022.9 | -10.9 |
Overcast with showers and a period of rain from late morning, clearing in the afternoon. NE wind. | ||||||||||||
22 | 14.0 | 26.1 | 18.4 | 6.8 | 31 | 153 | East Nth East | 0.4 | 2.4 | 1005.4 | 1011.8 | -6.4 |
Light morning rain. Cloud breaking to a warm and sunny afternoon. NE wind. | ||||||||||||
23 | 13.8 | 25.5 | 17.4 | 3.2 | 26 | 74 | East Nth East | 0.4 | 5.2 | 990.9 | 1006.8 | -15.9 |
Cloudy with a few spots of rain around midday. Showers from evening. Light NE wind. | ||||||||||||
24 | 13.2 | 21.5 | 16.7 | 5.0 | 28 | 113 | South Sth West | 0.4 | 3.6 | 987.2 | 999.8 | +12.6 |
Variable cloud with some showers and sunny intervals. Light winds tending southerly. | ||||||||||||
25 | 10.5 | 18.3 | 13.0 | 5.6 | 28 | 126 | East Nth East | 0.8 | 5.0 | 999.8 | 1008.4 | +8.6 |
Overcast, light rain in the morning. Sunny intervals after midday but cloud thickening with showers later in the afternoon. | ||||||||||||
26 | 8.5 | 16.5 | 11.7 | 8.7 | 34 | 198 | South Sth West | 2.6 | 8.2 | 1007.0 | 1019.4 | +12.4 |
Morning showers clearing with a few sunny intervals in the afternoon. Showers returning in the evening. Let it snow: A white Boxing Day for Motueka as hail batters the top of the south |
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27 | 6.4 | 17.0 | 10.5 | 6.8 | 31 | 154 | South Sth West | 1.6 | 17.8 | 1019.2 | 1024.2 | +5.0 |
Morning rain clearing around midday with cloud breaking. Cold southerly wind. | ||||||||||||
28 | 3.6 | 21.0 | 12.4 | 3.9 | 25 | 88 | East Nth East | 0 | 0 | 1017.4 | 1024.2 | -6.8 |
Sunny and mild from late morning, light W to SW winds turning NE in the afternoon. Christchurch water use getting closer to restriction levels |
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29 | 4.6 | 19.7 | 13.1 | 6.2 | 33 | 142 | East Nth East | 0 | 0 | 1017.8 | 1019.2 | +1.4 |
Sunny and mild. Cool NE wind freshening later in the afternoon. | ||||||||||||
30 | 12.1 | 20.1 | 14.7 | 9.0 | 32 | 205 | Eat Nth East | 0 | 0 | 1017.8 | 1026.0 | -8.2 |
Overcast but a few sunny intervals in the afternoon. NE wind. Recent rain provides little relief for Christchurch's dry Port Hills |
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31 | 13.3 | 20.6 | 15.9 | 9.3 | 36 | 213 | East Nth East | 0 | 0 | 1018.6 | 1026.6 | -7.4 |
Mostly cloudy but a few sunny intervals. NE wind. |