August Summary

Close to average temperature, the windiest August since 2013, 136% of expected rainfall making it the wettest August since 2012 but 2021 is still below expected yearly average.

(August compared to my records from the past 10 years.)

  • This August was just above my average temperature of 7.8c with 8.0C.
    • The coldest temperature was -2.2C which is about the expected minimum for August.
    • The highest temperature was 21.2C, my average August maximum is 20.9C.
    • Five air frosts (air temperature at or below 0) were recorded, my average is 6.
    • Four days failed to reach or exceed 10C, my average is 5.
    • Six days reached or exceeded 15C, my average is 8.
    • Three days reached or exceeded 20C, my average is 1.
  • Wind run was 109% of my average of 3825km with 4185km, the windiest August since 2013 with 4210km.
  • The barometer recorded above average pressure for the month with 1012.6hPa. My average is 1011.6hPa.
  • Rainfall was 136% of the average expected total of 46mm with 62.6mm.
    • The wettest August in the past 10 years is 2012 with 118mm and in all my records 2004 with 172.4mm.
August 2021 Summary
Temperature
Mean 8.0 C
Mean Maximum 12.9 C
Mean Minimum 3.3 C
Maximum High 21.2 C (23rd)
Maximum Low 9.7 C (1st)
Minimum High 4.3 C (9th)
Minimum Low -2.2 C (15th)
Wind Speed and Direction
Maximum Gust 62 km/h (3rd)
Mean 5.9 km/h
Wind Run 4185 km
Max Daily Windrun 393 km (3rd)
Prevailing Direction East North East
Barometer
Maximum 1034.3 hPa (31st)
Minimum 986.3 hPa (17th)
Mean 1012.6 hPa
Max Daily Change +24.1 hPa (20th)
Rainfall
Days with Measured Rainfall
(0.2mm or more)
15
Max Daily Rainfall 28.8 mm (3rd)
Monthly Rainfall 62.6 mm
Humidity
Maximum 99 %
Minimum 39 % (25th)

August 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 9.7 12.5 10.6 10.4 34 236 East Nth East 0 0 1007.4 1013.0 -5.6
Low cloud with some sunny intervals in the afternoon, NE wind.
2 8.5 11.9 10.3 9.8 35 225 East Nth East 0.4 0.6 995.9 1007.3 -11.4
Low cloud with some sunny intervals in the afternoon, showers at night. Cool NE wind.
3 4.9 8.6 7.2 17.2 62 393 South Sth West 1.0 26.8 997.3 1017.0 +17.7
Overcast with rain easing from midday and clearing in the afternoon. Fresh to strong cold southerly wind.
4 -0.3 10.2 5.5 5.1 29 114 East Nth East 0.2 0.2 1004.1 1015.4 -11.3
Light morning frost. Sunny with light breezes. High cloud increasing later in the afternoon with a cool NE wind.
5 5.2 10.9 8.4 10.3 44 235 East Nth East 0.2 0.4 990.6 1003.7 -13.1
Light rain in the morning clearing by midday with sunny intervals in the afternoon. Cool NE wind.
Where's winter? NZ on track for another record warm season
6 4.8 8.4 7.0 5.9 24 134 South West 0.4 6.8 989.6 993.2 +3.6
Overcast with light rain in the morning and drizzle in the afternoon. Light southerly winds.
7 1.0 12.9 6.2 2.9 40 66 South Sth West 0.2 0.2 991.4 1002.6 +11.2
Early cloud breaking later in the morning with wind easing to a breeze making a pleasant afternoon.
8 2.4 5.0 4.0 3.8 34 86 South Sth West 0.4 11.0 1001.1 1010.0 +8.9
Overcast and cold with rain easing to showers in the afternoon. Snow in areas around Christchurch but only 1 hail shower observed in the afternoon with temperature mostly around 3 to 4C during the day.
9 0.9 4.3 2.7 8.5 43 195 South Sth West 1.0 6.4 1010.2 1015.6 +5.4
Cold with showers, sleet and snow flurries. Southerly winds.
South Island highways reopen after 'hundreds' stranded by snowy conditions
Snow brings traffic to a stop on busy highway in North Canterbury
10 0.9 14.7 6.7 1.2 16 28 North Nth West 0 0 1015.3 1020.3 +5.0
Clear and sunny with light breezes tending northerly.
11 2.1 13.9 8.5 5.0 30 114 East Nth East 0 0 1020.9 1027.4 +6.5
Clear and sunny with a cool NE wind in the afternoon.
12 4.3 13.4 10.2 6.9 40 156 East Nth East 0 0 1003.0 1024.3 -21.3
Overcast with high cloud, NE winds turning northerly in the evening.
13 5.3 12.5 8.7 4.1 30 94 West Nth West 0.2 0.6 1002.3 1012.1 +9.8
Light rain clearing in the afternoon with cloud breaking. Variable breezes turning NE at night.
14 0.4 13.4 6.0 5.1 56 116 East Nth East 0.4 2.6 1000.3 1013.2 +12.9
Morning cloud increasing with a strong southerly change about 11am with some rain. Cloud clearing in the afternoon and wind dying away.
15 -2.2 14.3 5.6 2.1 18 48 East Nth East 0 0 1013.1 1017.4 -4.3
Morning frost, mostly sunny with some high cloud at times, light winds tending NE.
16 1.5 17.0 9.5 6.1 40 140 East Ntn East 0 0 990.3 1013.6 -23.3
Mostly sunny with some high cloud, winds tending milder northerly in the afternoon.
17 5.8 14.7 9.8 7.5 34 171 North Nth East 0 0 986.3 992.6 +6.3
Cloud breaking in the afternoon with sunny intervals, winds tending northerly
18 3.2 11.1 6.6 5.3 29 120 South Sth West 0.4 1.2 993.0 1010.2 +17.2
Morning showers clearing and cloud breaking to a sunny though cool afternoon with southerly winds dying away.
19 -0.7 17.0 7.6 3.6 33 81 East Nth East 0 0 1006.3 1010.5 -4.2
Sunny and mild in the afternoon with northerly winds.
20 0.0 10.2 5.7 7.6 44 173 South Sth West 0.2 0.8 1008.2 1032.3 +24.1
Morning showers clearing to a sunny though cool afternoon. Southerly wind.dying out in the evening.
21 -0.7 10.6 5.7 9.0 40 205 East Nth East 0 0 1025.7 1032.8 -7.1
Sunny with a fresh cool NE wind.
22 3.3 14.4 9.5 4.5 27 103 East Nth East 0 0 1020.9 1025.5 -4.6
Overcast with high cloud, light winds.
23 3.9 21.2 11.4 3.0 26 68 East Nth East 0 0 1024.2 1027.0 +2.8
Sunny and mild from late morning with some high cloud at times, light winds tending NE.
24 4.6 20.7 11.8 4.1 35 93 East Nth East 0 0 1023.4 1026.3 -2.9
Sunny and mild with a few patches of high cloud, NW winds in the afternoon.
25 4.3 20.7 11.9 3.7 27 84 North Nth West 0 0 1023.1 1025.2 +2.1
Sunny and mild with northerly winds.
26 2.9 19.8 11.5 3.8 39 86 East Nth East 0 0 1016.1 1024.5 -8.4
Mild with northerly winds in the afternoon and increasing cloud.
27 8.3 11.6 9.5 6.0 28 136 South West 0.4 1.4 1016.6 1021.7 -5.1
Light rain and drizzle at times, southerly winds.
28 7.0 12.0 8.9 7.3 24 167 South West 0.2 2.0 1011.0 1016.5 -5.5
Overcast with light rain and drizzle. Cloud breaking with sunny intervals in the afternoon. Southerly winds.
29 7.3 11.3 8.6 3.4 18 78 East Nth East 0 0 1007.7 1014.7 +7.0
Cloudy and cool with light NE wind turning southerly in the afternoon.
30 2.1 10.6 7.0 3.8 21 86 South Sth West 0.2 1.4 1014.0 1029.7 +14.3
Showers clearing before dawn. Cloudy with some sunny intervals in the afternoon, light southerly winds turning NE from mid afternoon.
31 2.4 10.1 6.5 6.2 31 140 East Nth East 0 0 1028.7 1034.3 +5.6
Cloud breaking in the afternoon, cool NE wind.


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