December Summary
Near average temperature, 92% wind run and 198% of expected rainfall.
(December compared to my records from the past 10 years.)
- This December was near my average temperature of 16.3C with 16.4C. The warmest December is 2017 with an average temperature of 18.3C.
- The coldest temperature was 7.4C the expected minimum for December is 4.9C. This is the warmest minimum temperature of any December in my records.
- The highest temperature was 32.2C, my average December maximum is 32.0C.
- No days failed to reach 10C.
- Twenty nine days reached or exceeded 15C, my average is 30.
- Sixteen days reached or exceeded 20C, my average is 22.
- Nine days reached or exceeded 25C, may average is 10.
- Two day reached or exceeded 30C, may average is 3.
- Wind run was 92% of my average of 5325km with 4893km.
- The barometer recorded near average pressure for the month with 1010.3hPa. My average is 1010.9hPa.
- Rainfall was 198% of the average expected total of 50mm with 99.6mm, the wettest December in the past 10 years and third wettest in my records.
- The driest December in the past 10 years is 2014 with 26mm and all my records is 2003 with just 2mm falling on 1 day.
December 2021 Summary Temperature | |
---|---|
Mean | 16.4 C |
Mean Maximum | 21.9 C |
Mean Minimum | 11.6 C |
Maximum High | 32.2 C (22nd) |
Maximum Low | 16.6 C (4th) |
Minimum High | 12.8 C (6th) |
Minimum Low | 7.4 C (1st) |
Wind Speed and Direction | |
Maximum Gust | 44 km/h (20th, 21st) |
Mean | 6.9 km/h |
Wind Run | 4893 km |
Max Daily Windrun | 313 km (16th) |
Prevailing Direction | East North East |
Barometer | |
Maximum | 1027.7 hPa (6th) |
Minimum | 990.2 hPa (16th) |
Mean | 1010.3 hPa |
Max Daily Change | -17.4 hPa (15th) |
Rainfall | |
Days with Measured Rainfall (0.2mm or more) |
18 |
Max Daily Rainfall | 48.2 mm (15th) |
Monthly Rainfall | 99.6 mm |
Humidity | |
Maximum | 97 % |
Minimum | 21 % (21st) |
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 | 7.4 | 19.4 | 13.3 | 5.7 | 29 | 129 | East Nth East | 0 | 0 | 1023.6 | 1027.4 | +3.8 |
Cloud with sunny intervals. Cloud thickening in the afternoon, NE wind. | ||||||||||||
2 | 12.4 | 17.5 | 14.6 | 10.8 | 39 | 248 | East Nth East | 0.2 | 1.4 | 1023.9 | 1027.4 | -3.5 |
Overcast with morning drizzle and light rain, NE wind freshening in the afternoon. | ||||||||||||
3 | 14.2 | 20.2 | 17.0 | 9.3 | 35 | 212 | East Nth East | 0.4 | 0.8 | 1015.1 | 1023.7 | -8.6 |
Cloudy with an early shower and a few spots of rain later in the afternoon. NE wind. 'Fingerprints of climate change' all over warmest November on record, Niwa says |
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4 | 16.6 | 31.4 | 22.5 | 4.5 | 31 | 102 | East Nth East | 0 | 0 | 1009.3 | 1014.9 | -5.6 |
Mostly cloudy and warm with some sunny intervals in the afternoon. Light winds tending NE. | ||||||||||||
5 | 12.1 | 28.2 | 21.0 | 9.1 | 36 | 206 | East Nth East | 0.6 | 3.4 | 1005.6 | 1015.8 | +10.2 |
Mostly cloudy and warm with NE winds turning nor 'west in the afternoon. A cool southerly change in the evening with a few showers | ||||||||||||
6 | 8.5 | 12.8 | 10.4 | 6.9 | 43 | 156 | South Sth West | 0.6 | 6.8 | 1016.5 | 1027.7 | +11.2 |
Overcast with light showers and a period of rain in the afternoon. Drizzle in the evening. Cool southerly wind dying out later in the afternoon. | ||||||||||||
7 | 9.4 | 16.8 | 12.1 | 2.0 | 13 | 45 | West | 0.2 | 3.4 | 1019.6 | 1027.3 | -7.7 |
Overcast with light rain and drizzle clearing from mid afternoon. Light breezes tending westerly. | ||||||||||||
8 | 8.9 | 20.2 | 14.9 | 7.6 | 40 | 174 | East Nth East | 0 | 0 | 1012.8 | 1020.3 | -7.5 |
Sunny intervals in the morning. Overcast in the afternoon with freshening a NE wind. | ||||||||||||
9 | 13.6 | 25.3 | 17.3 | 5.9 | 25 | 133 | East Nth East | 0 | 0 | 1008.8 | 1014.7 | -5.9 |
Variable cloud but a mostly sunny afternoon with light winds. Climate change behind flooding in Canterbury in May |
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10 | 14.0 | 19.8 | 15.9 | 9.3 | 34 | 212 | East Nth East | 0.2 | 0.4 | 1009.8 | 1015.9 | -6.1 |
Overcast with low cloud, drizzle around midday clearing and NE wind freshening in the afternoon. | ||||||||||||
11 | 11.3 | 19.3 | 14.8 | 9.0 | 36 | 204 | South Sth West | 0.2 | 1.8 | 1006.4 | 1017.6 | +11.2 |
Low cloud with drizzle at times, southerly wind | ||||||||||||
12 | 10.0 | 17.3 | 13.0 | 4.9 | 25 | 111 | East Nth East | 0.2 | 0.2 | 1017.9 | 1023.8 | +5.9 |
Overcast morning, cloud breaking in the afternoon with sunny intervals, NE wind. | ||||||||||||
13 | 11.9 | 18.1 | 14.8 | 7.6 | 29 | 174 | East Nth East | 0 | 0 | 1013.5 | 1022.8 | -9.3 |
Overcast with a NE wind. A few spots of drizzle in the evening. MetService to issue 'heat alerts' this summer to protect health |
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14 | 12.3 | 19.7 | 15.6 | 3.0 | 25 | 68 | South Sth West | 0 | 0 | 1011.0 | 1014.1 | -3.1 |
Overcast with light southerly winds | ||||||||||||
15 | 12.4 | 15.3 | 13.7 | 4.5 | 35 | 101 | West | 1.6 | 48.2 | 994.5 | 1011.9 | -17.4 |
Rain, heavier in the evening with southerly winds. The second wettest December day in my records, the wettest being 20th Dec 2006 with 55.4mm. The following 3 days recorded cool temperatures for the time of year. 'Things are really grim': Evacuations, slips, as 'extreme rain event' hits Canterbury |
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16 | 11.5 | 14.7 | 12.9 | 13.7 | 42 | 313 | South West | 0.6 | 10.6 | 990.2 | 994.4 | -4.2 |
Overcast with showers and drizzle, southerly wind. Flooding, heat, humidity and a gloomy capital: What's up with New Zealand's early summer weather? |
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17 | 11.0 | 19.5 | 13.5 | 4.3 | 29 | 99 | South Sth West | 1.2 | 4.4 | 990.7 | 999.8 | +9.1 |
Overcast with showers in the morning. Cloud breaking in the afternoon with some sunny intervals. Cloud increasing later with evening showers. | ||||||||||||
18 | 8.6 | 24.8 | 15.6 | 4.9 | 33 | 113 | East Nth East | 0.6 | 2.0 | 1000.2 | 1015.1 | +14.9 |
Showers clearing before dawn. Sunny morning, a few clouds in the afternoon with a NE wind. | ||||||||||||
19 | 12.1 | 28.5 | 20.1 | 6.0 | 30 | 137 | East Nth East | 0 | 0 | 1009.5 | 1015.0 | -5.5 |
Mostly sunny and warm with some high cloud with an E to NE wind. | ||||||||||||
20 | 13.6 | 29.1 | 21.9 | 8.9 | 44 | 203 | North Nth West | 0 | 0 | 994.9 | 1010.7 | -15.8 |
Some high cloud at times but mostly sunny and warm with a fresh nor 'west wind. | ||||||||||||
21 | 12.6 | 28.7 | 22.6 | 8.7 | 44 | 198 | North Nth West | 0 | 0 | 995.1 | 998.5 | +3.4 |
Clear and sunny with a warm Nor'west wind. Niwa forecasters find the start of summer by calculating the 90 warmest days in each 12-month period |
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22 | 12.4 | 32.4 | 23.3 | 6.4 | 37 | 144 | North Nth West | 0 | 0 | 994.5 | 998.8 | -4.3 |
Sunny with warm Nor 'west winds. | ||||||||||||
23 | 12.4 | 20.9 | 17.0 | 10.4 | 44 | 236 | East Nth East | 0 | 0 | 996.9 | 1010.5 | +13.6 |
Variable cloud with a fresh NE wind. | ||||||||||||
24 | 12.7 | 19.7 | 15.8 | 9.3 | 35 | 211 | South Sth West | 2.0 | 2.8 | 1010.1 | 1023.2 | +13.1 |
Morning shower and drizzle clearing by midday. Southerly wind. | ||||||||||||
25 | 8.1 | 20.0 | 14.7 | 7.7 | 41 | 175 | East Nth East | 0 | 0 | 1016.5 | 1025.2 | -8.7 |
Sunny morning, overcast with high cloud in the afternoon with a fresh NE wind | ||||||||||||
26 | 12.5 | 27.1 | 19.8 | 7.9 | 33 | 180 | East Nth East | 0 | 0 | 1005.2 | 1016.3 | -11.1 |
Clear and sunny with warm a nor'easterly | ||||||||||||
27 | 14.0 | 24.6 | 18.1 | 6.6 | 34 | 150 | South Sth West | 0.2 | 1.0 | 1003.0 | 1008.4 | +5.4 |
Sunny morning, overcast in the afternoon with the arrival of a southerly change. Showers in the evening. | ||||||||||||
28 | 11.4 | 18.1 | 14.0 | 4.7 | 27 | 107 | South Sth West | 0.6 | 7.2 | 1002.6 | 1006.0 | -3.4 |
Overcast with showers. Southerly wind. Summer of cyclones? Warmer seas and weather phenomenon play into elevated alert level for New Zealand |
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29 | 10.6 | 19.8 | 14.4 | 4.3 | 27 | 97 | East Nth East | 0.2 | 0.4 | 1002.7 | 1004.8 | +2.1 |
Overcast in the morning with showers, cloud breaking in the afternoon, light winds. | ||||||||||||
30 | 9.9 | 28.1 | 18.0 | 4.3 | 27 | 98 | East Nth East | 1.4 | 4.0 | 1000.2 | 1010.2 | +10.0 |
Sunny and warm with light winds, showers from evening. | ||||||||||||
31 | 11.4 | 21.2 | 15.9 | 6.2 | 30 | 140 | East Nth East | 0.2 | 0.4 | 1007.4 | 1011.1 | -3.7 |
Morning showers clearing before dawn. Cloud breaking to a mostly sunny afternoon with a NE wind. |