July Summary

Close to average temperature, the windiest July since 2008, just 26% of expected rainfall, the driest July in my records.

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

  • This July was just above my average temperature of 6.7c with 7.1C.
    • The coldest temperature was -4.2C, the coldest July temperature since 2010 where I recorded -4.3C
    • My average July minimum is -3.1C.
    • Ten air frosts (air temperature at or below 0) were recorded, my average is 8.
    • The highest temperature was 17.3C, my average July maximum is 18.4C.
    • Eleven days failed to reach or exceed 10C, my average is 10 days.
    • Three days reached or exceeded 15C, my average is 5.
  • Wind run was 122% of my average of 3386km with 4134km, the windiest July since 2008 with 4724km.
  • The barometer recorded below average pressure for the month with 1010.7hPa. My average is 1012.5hPa.
    • The pressure change of 27.8hPa on the 6th was the highest pressure change since 2011 with 28.8hPa.
  • Rainfall was just 26% of the average expected total of 60mm with 16mm, making 2021 the driest July in my records
    • The wettest July in the past 10 years is 2017 with 167mm and in all my records 2008 with 195mm.
July 2021 Summary
Temperature
Mean 7.1 C
Mean Maximum 11.7 C
Mean Minimum 2.7 C
Maximum High 17.6 C (6th)
Maximum Low 9.3 C (31st)
Minimum High 8.5 C (12th)
Minimum Low -4.2 C (12th)
Wind Speed and Direction
Maximum Gust 64 km/h (6th)
Mean 5.8 km/h
Wind Run 4134 km
Max Daily Windrun 255 km (26th)
Prevailing Direction East North East
Barometer
Maximum 1040.7 hPa (2nd)
Minimum 970.7 hPa (17th)
Mean 1010.7 hPa
Max Daily Change -27.8 hPa (6th)
Rainfall
Days with Measured Rainfall
(0.2mm or more)
12
Max Daily Rainfall 5.4 mm (27th)
Monthly Rainfall 16.4 mm
Humidity
Maximum 99 %
Minimum 47 % (6th)

 

July 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 1.5 10.1 7.0 4.0 27 92 East Nth East 0 0 1038.0 1040.3 +2.3
Some cloud but mostly sunny with a cool NE wind.
2 1.4 11.0 6.3 3.5 24 80 East Nth East 0 0 1038.6 1040.7 +2.1
Mostly cloudy with some sunny intervals. Cool NE wind from mid morning.
Climate change: Scientists defining NZ's new 'normal'
3 -0.7 9.9 3.5 2.2 22 49 East Nth East 0.2 0.2 1037.2 1040.5 -3.3
Morning frost. Sunny with some cloud in the afternoon with a light NE wind.
4 -3.4 8.8 3.4 3.8 21 86 East Nth East 0.2 0.2 1032.4 1040.6 -8.2
First good frost of the winter. Sunny with NE winds in the afternoon.
5 6.3 14.4 8.8 5.7 30 130 East Nth East 0 0 1018.7 1032.2 -13.5
Cloudy with light NE winds.
Niwa confirms NZ's warmest June, with more mild days ahead
6 8.9 17.6 13.4 11.0 64 252 East Nth East 0 0 990.5 1018.3 -27.8
Mostly cloudy and mild with north to NE winds
7 3.3 11.7 7.2 7.6 56 180 South West 0.4 1.2 986.9 1008.3 +21.4
Overcast with light showers and west to SW winds. Maximum temperature recorded at 12:10am
8 -1.3 9.2 3.5 2.5 34 58 South Sth West 0.2 0.2 1004.2 1007.3 +3.1
Morning frost then sunny with a cool southerly wind in the afternoon dying away by evening.
9 -2.3 9.9 3.5 3.9 44 88 South Sth West 0 0 999.9 1007.2 -7.3
Morning frost. Sunny with virtually no wind. A southerly change blowing through in the evening.
10 -0.6 9.4 5.3 8.3 48 190 South Sth West 0 0 1007.3 1014.3 +7.4
Sunny with light southerly breezes. Southerly winds increasing in the evening.
11 -2.5 9.3 3.1 4.5 41 102 South Sth West 0 0 1014.7 1021.0 +6.3
 
12 -4.2 8.5 1.6 2.8 21 63 East Nth East 0 0 1013.0 1020.0 -7.0
Hard frost, sunny with light NE winds from midday.
13 -1.9 9.5 2.2 2.1 15 46 West 0 0 1014.3 1016.5 -2.2
Frost. Sunny with light winds tending westerly.
14 -2.6 11.1 4.2 3.8 25 85 East Nth East 0 0 1006.7 1015.9 -9.2
Sunny with some high cloud during the day, light NE wind.
15 4.4 12.8 9.0 5.5 29 123 East Nth East 0 0 1006.0 1012.6 +6.6
Cloudy with northerly winds in the morning turning briefly southerly then NE from midday.
16 8.1 17.3 11.5 7.0 30 159 East Nth East 0.2 0.2 990.3 1009.0 -18.7
Early light shower clearing before dawn. Overcast but milder then recently with a NE wind.
17 8.8 17.0 11.4 5.6 29 127 East Nth East 0.4 2.6 970.7 989.9 -19.2
Mostly cloudy but some sunny intervals with showers morning and from later in the afternoon.
Hundreds spend night in evacuation centres as heavy rain hits parts of NZ
18 6.3 11.6 8.8 6.8 31 154 South Sth West 0.2 0.8 975.0 991.6 +16.6
Cloudy with some sunny intervals in the afternoon, cool southerly winds.
19 5.5 9.1 7.7 7.6 26 173 South West 0.4 2.6 991.7 1005.0 +13.3
Cloudy with cool a southerly wind and drizzle at times.
Warmer weather 'loading the dice' towards more intense rainfall, scientists say
20 -0.6 9.4 5.6 4.8 26 111 East Nth East 0.2 0.2 1004.1 1008.2 -4.1
Morning fog clearing to a sunny morning. Cloud returning around midday with a cool NE wind.
Stopbanks won't save us: Scientists critical of lack of long-term flooding planning
21 5.6 13.2 9.2 5.1 24 115 East Nth East 0 0 991.7 1003.9 -12.2
Cloud increasing from morning to a mostly overcast day. NE wind.
22 6.4 9.6 7.7 8.3 39 189 South West 0.4 2.6 988.9 1009.8 +20.9
Overcast with showers from mid morning. Southerly wind. Maximum temperature recorded at midnight.
23 0.4 10.1 6.2 4.0 23 90 East Nth East 0.2 0.2 1010.0 1021.6 +11.6
Sunny with a cool NE wind.
24 0.5 11.0 6.7 6.0 32 137 East Nth East 0 0 1020.1 1025.5 -5.4
Sunny with a cool NE wind later in the morning, cloud increasing later in the afternoon.
25 3.9 13.0 9.1 9.7 35 221 East Nth East 0 0 1002.7 1019.8 -17.1
A mostly sunny morning, high cloud increasing in the afternoon. NE wind.
26 9.0 13.8 10.6 11.2 47 255 East Nth East 0 0 987.6 1002.5 -14.9
Overcast with low cloud and fresh NE wind. Cloud breaking in the afternoon and wind easing.
27 2.8 11.6 7.6 5.9 42 135 East Nth East 0.6 5.4 987.5 1009.0 +21.5
Morning rain with a southerly change clearing about midday with cloud breaking in the afternoon and the wind dying away.
Is 25C too hot? How we decide what qualifies as a heatwave
28 1.9 14.3 7.5 3.7 20 85 East Nth East 0 0 1008.9 1015.6 +6.7
Sunny with light breezes tending NE. Cloud increasing in the afternoon with a cooler southerly change.
Weather: The wettest and sunniest places in NZ for July revealed
29 0.8 10.5 7.0 5.0 28 114 East Nth East 0 0 1012.6 1015.8 -3.2
Morning cloud breaking but returning in the afternoon with a cool NE wind.
Flood flows on the Buller River were the largest of any NZ river recorded in almost a century
30 8.4 14.2 10.6 8.9 34 202 East Nth East 0 0 1009.1 1012.6 -3.5
Some high cloud but mostly sunny with a NE wind.
Weather: Dry, warm forecast for many regions from late-winter into spring
31 9.3 13.2 10.9 10.0 34 228 East Nth East 0 0 1009.9 1013.3 +3.4
Sunny with a NE wind, cloud increasing from late afternoon.


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