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
TemperatureWindRainfallBarometer
DateMinMaxMeanMean
(Km/h)
Gust
(Km/h)
Run (km)Prevailing Dir10 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
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
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
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
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?
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
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
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.


December 2021  Temperature Graph
December 2021 Wind Dir Graph
December 2021 Wind Dir Graph
December 2021 Wind Speed Graph
December 2021 Rainfall Graph
December 2021 Barograph
December 2021 Humidity Graph