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 | ||||||||||||
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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 | 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' |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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. |