July Summary
About average temperature and well above average rainfall.
- July was near my average temperature of 5.9C with 6.1C.
- The warmest July was 2013 with 7.6C, the coolest, 2001 with 2.5C.
- The warmest temperature was 15.1C, the warmest July temperature I've recorded is 21.6 in 2014.
- The coldest temperature was -3.8C. The lowest July temperature I've recorded was in 2001 with -6.9C.
- Seven air frosts were recorded (air temperature 0C or below), my average is 11.
- Fourteen days failed to reach or exceed 10C, my average is 14.
- One day reached or exceeded 15C, my average is 3.
- Wind run was 111% of my average of 3328km with 3703km. The windiest July I've recorded was 2008 with 4724km. The least windy July was 2010 with 2635km.
- The barometer recorded below average pressure for the month with 1009.6hPa. My average is 1013.6hPa. The 21st also had the lowest pressure I've recorded at my station with 964.6hPa
- It was a very wet month. Rainfall was 283% of my average expected total of 59mm with 167mm. 2017 rainfall is above my long term average.
- The driest July is 2000 with 18.8mm, the wettest is 2008 with 192.8mm.
| July 2017 Summary Temperature | |
|---|---|
| Mean | 6.1 C |
| Mean Maximum | 10.3 C |
| Mean Minimum | 2.1 C |
| Maximum High | 15.1 C (20th) |
| Maximum Low | 7.5 C (1st) |
| Minimum High | 4.9 (12th) |
| Minimum Low | -3.8 C (30th) |
| Wind Speed and Direction | |
| Maximum Gust | 54 km/h (22nd) |
| Mean | 5.2 km/h |
| Wind Run | 3703 km |
| Max Daily Windrun | 423 km (22nd) |
| Prevailing Direction | East North East |
| Barometer | |
| Maximum | 1028.7 hPa (30th) |
| Minimum | 964.6 hPa (21st) |
| Mean | 1009.6 hPa |
| Max Daily Change | -24.4 hPa (22nd) |
| Rainfall | |
| Days with Measured Rainfall (0.5mm or more) |
16 |
| Max Daily Rainfall | 55.5 mm (22nd) |
| Monthly Rainfall | 167.0 mm |
| Humidity | |
| Maximum | 100 % (Several days) |
| Minimum | 53 % (31st) |
| July Daily Observations | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 7.5 | 11.0 | 9.3 | 7.1 | 20 | 118 | South West | 0.5 | 1.0 | 1005.8 | 1011.1 | -5.3 |
| Showers clearing by dawn and cloud breaking for a while late morning but overcast again after midday. Light southerly winds | ||||||||||||
| 2 | 6.8 | 11.7 | 8.3 | 2.7 | 19 | 61 | South Sth West | 0 | 0 | 1003.5 | 1007.2 | -3.7 |
| Overcast with light winds tending southerly. | ||||||||||||
| 3 | 3.5 | 12.6 | 7.0 | 3.1 | 22 | 71 | South Sth West | 0 | 0 | 1003.9 | 1009.9 | -5.2 |
| Morning cloud breaking to a mostly sunny afternoon with light breezes tending southerly from midday. | ||||||||||||
| 4 | 4.4 | 10.0 | 6.7 | 6.8 | 47 | 155 | West Nth West | 0.5 | 1.0 | 1000.0 | 1012.5 | +12.5 |
| Cold southerly change in the morning clearing by midday to a sunny afternoon with light westerly breezes. | ||||||||||||
| 5 | -0.6 | 9.8 | 4.6 | 4.1 | 24 | 94 | South Sth West | 0 | 0 | 1012.0 | 1017.7 | +5.7 |
| Morning frost, cloud increasing in the afternoon, cool southerly winds. | ||||||||||||
| 6 | -0.2 | 9.6 | 4.4 | 0.8 | 15 | 19 | Light Air | 0 | 0 | 1013.3 | 1017.6 | -4.3 |
| Mostly cloudy with occasional sunny intervals. Light variable breezes. | ||||||||||||
| 7 | 0.3 | 9.1 | 4.6 | 2.5 | 17 | 56 | East Nth East | 0 | 0 | 1009.0 | 1013.2 | -4.2 |
| Cloudy with cool NE breeze from late morning. Drizzle in the afternoon. | ||||||||||||
| 8 | 0.7 | 10.7 | 6.1 | 3.2 | 24 | 72 | East Nth East | 0 | 0 | 1004.1 | 1009.5 | -5.4 |
| Variable cloud, cool NE winds. | ||||||||||||
| 9 | 4.6 | 10.5 | 6.6 | 4.8 | 21 | 111 | South Sth West | 0 | 0 | 1003.5 | 1009.6 | +6.1 |
| Morning cloud breaking a little in the afternoon, cold southerly wind. | ||||||||||||
| 10 | 0.3 | 11.0 | 6.3 | 1.3 | 16 | 29 | East Nth East | 0.5 | 0.5 | 1009.4 | 1012.7 | +3.3 |
| Morning mist and fog clearing to a mostly sunny day with a few clouds. Light NE winds. 0.5mm of rain recorded from dew condensation. | ||||||||||||
| 11 | -1.1 | 10.6 | 3.7 | 7.1 | 43 | 163 | East Nth East | 1.0 | 18.5 | 1006.0 | 1014.5 | +8.5 |
| Morning frost then sunny. Cloud increasing in the afternoon with cold southerlies and rain with hail and sleet in the evening. | ||||||||||||
| 12 | 0.2 | 4.9 | 2.0 | 8.5 | 36 | 193 | West | 0.5 | 16.5 | 1014.1 | 1023.1 | +9.0 |
| Rain, hail, snow showers and very cold wind. | ||||||||||||
| 13 | 0.5 | 7.8 | 4.0 | 5.9 | 29 | 133 | South West | 0.5 | 9.0 | 1021.8 | 1024.6 | -2.8 |
| Cold with showers, some with hail, southerly winds | ||||||||||||
| 14 | 4.5 | 8.6 | 5.8 | 5.3 | 26 | 121 | South West | 0.5 | 1.0 | 1022.4 | 1024.3 | -1.9 |
| Overcast with a few sunny intervals. Occasional drizzle. Cold southerly wind. | ||||||||||||
| 15 | 1.3 | 8.3 | 4.9 | 2.8 | 17 | 64 | East Nth East | 0 | 0 | 1021.8 | 1024.4 | -2.6 |
| Morning fog lifting and clearing by 11am. Sunny though cool with light NE winds. Low cloud and fog returning in the evening. | ||||||||||||
| 16 | 0.5 | 9.8 | 6.9 | 7.2 | 32 | 165 | East Nth East | 0 | 0 | 1015.7 | 1021.5 | -5.8 |
| Overcast and cool with a NE wind. A few spots of rain in the afternoon. | ||||||||||||
| 17 | 4.8 | 10.0 | 7.9 | 6.9 | 28 | 159 | South West | 1.0 | 7.5 | 1014.9 | 1021.3 | +6.4 |
| Overcast with light rain and drizzle in the morning clearing by midday. A period of heavier rain in the evening. Southerly winds. | ||||||||||||
| 18 | 3.8 | 10.2 | 7.2 | 4.4 | 29 | 101 | East Nth East | 0.5 | 0.5 | 1015.3 | 1022.4 | -7.1 |
| Showers clearing before dawn, cloud breaking to a mostly sunny afternoon with NE winds. | ||||||||||||
| 19 | 3.4 | 13.4 | 8.1 | 5.4 | 32 | 122 | East Nth East | 0 | 0 | 1000.7 | 1014.9 | -14.2 |
| Feeling mild about midday, NE winds with variable high cloud. | ||||||||||||
| 20 | 4.7 | 15.1 | 10.1 | 5.8 | 32 | 132 | East Nth East | 0 | 0 | 983.8 | 1000.5 | -16.7 |
| Overcast and mild for the time of year. NE winds. | ||||||||||||
| 21 | 6.1 | 12.3 | 8.9 | 12.6 | 41 | 288 | South West | 1.0 | 29.5 | 964.6 | 983.5 | -18.9 |
| Morning rain easing to showers in the afternoon, southerly winds. 964.6hPa is the lowest barometric pressure I've recorded in 11 years of barometer records. Previous record was June 2007 with 971.5hPa | ||||||||||||
| 22 | 5.3 | 9.1 | 6.7 | 18.5 | 54 | 423 | West | 1.5 | 55.5 | 978 | 1002.4 | +24.4 |
| Rain and fresh to strong south to south west winds easing in the evening. Flooding in Christchurch and several areas down the East coast of the South Island. Maximum temperature recorded at 3am. It was the windiest day since April 6th this year and the wettest day since the 15th March 2014. | ||||||||||||
| 23 | 3.7 | 9.1 | 5.6 | 4.2 | 29 | 95 | East Nth East | 0.5 | 0.5 | 1000.2 | 1004.8 | -4.6 |
| Morning cloud clearing to a sunny day with cool NE winds. | ||||||||||||
| 24 | 3.0 | 11.7 | 7.3 | 2.6 | 19 | 59 | East Nth East | 0 | 0 | 994.1 | 1000.2 | -6.1 |
| Cloud increasing during the day, light NE winds. | ||||||||||||
| 25 | -0.7 | 14.5 | 5.3 | 1.0 | 14 | 21 | East Nth East | 0.5 | 0.5 | 998.7 | 1003.8 | +5.1 |
| Clear and sunny, light breezes tending NE in the afternoon. Rain recorded from frost condensation. | ||||||||||||
| 26 | -1.0 | 12.7 | 6.2 | 2.9 | 30 | 66 | East Nth East | 0 | 0 | 996.6 | 1003.9 | -7.3 |
| Morning frost. Cloud increasing with NE winds later in the afternoon. | ||||||||||||
| 27 | 4.6 | 8.9 | 7.0 | 6.6 | 40 | 150 | South West | 1.0 | 10.5 | 995.6 | 1009.8 | +14.2 |
| Light rain from morning, heavier from late afternoon. Southerly winds. | ||||||||||||
| 28 | 0.3 | 6.6 | 3.4 | 6.9 | 44 | 157 | South Sth West | 1.0 | 13.0 | 1010.3 | 1023.2 | +12.9 |
| Showers, some with hail in the afternoon. Cold southerly wind. | ||||||||||||
| 29 | -2.5 | 9.0 | 1.9 | 1.1 | 15 | 24 | South Sth West | 0 | 0 | 1023.1 | 1027.2 | +4.1 |
| Morning frost. Cloud breaking and clearing from late morning with a sunny afternoon. Light southerly breezes. | ||||||||||||
| 30 | -3.8 | 8.8 | 3.2 | 7.0 | 35 | 159 | East Nth East | 0.5 | 0.5 | 1024.4 | 1028.7 | -4.3 |
| Heavy frost then sunny with a few clouds, cold NE wind from late morning. | ||||||||||||
| 31 | 1.6 | 12.4 | 7.6 | 4.8 | 35 | 109 | East Nth East | 0 | 0 | 1014.7 | 1024.3 | -9.6 |
| Cloud increasing during the morning, overcast by afternoon, NE winds. | ||||||||||||
