| July 2011 Summary Temperature |
|
|---|---|
| Mean | 5.4 C |
| Mean Maximum | 10.8 C |
| Mean Minimum | 0.5 C |
| Maximum High | 15.1 C (29th) |
| Maximum Low | 4.0 C (2nd) |
| Minimum High | 2.6 C (25th) |
| Minimum Low | -4.0 C (26th) |
| Wind Speed and Direction | |
| Maximum Gust | 49 km/h (25th) |
| Mean | 4.2 km/h |
| Wind Run | 2964 km |
| Max Daily Windrun | 263 km (25th) |
| Prevailing Direction | East Nth East |
| Barometer | |
| Maximum | 1031.2 hPa (2nd) |
| Minimum | 973.7 hPa (12th) |
| Mean | 1006.5 hPa |
| Max Daily Change | -28.8 hPa (5th) |
| Rainfall | |
| Days with Measured Rainfall (Greater than 0.2mm) |
11 |
| Max Daily Rainfall | 17.5 mm (25th) (Snow) |
| Monthly Rainfall | 32.5 mm |
| Humidity | |
| Maximum |
100 % (Several days) |
| Minimum | 37 % (10th) |
| 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 | -1.6 | 9.1 | 3.5 | 1.6 | 17 |
35 | South Sth West |
0 | 0 | 1024.4 | 1030.0 | +5.6 |
| Morning frost. Clouding over with a few sunny intervals. Light southerly breezes. |
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| 2 | 4.0 | 9.8 | 6.6 | 4.6 | 29 | 105 | East Nth East | 0 | 0 | 1026.3 | 1031.2 | -4.9 |
| Early morning drizzle and cloud clearing to a sunny day with cool NE winds | ||||||||||||
| 3 | -1.4 | 10.6 | 3.6 | 1.2 | 12 | 28 | East Nth East | 0.5 | 0.5 | 1019.9 | 1027.4 | -7.5 |
| Morning frost, clear and sunny with light breezes. 0.5mm of rain from frost condensation. |
||||||||||||
| 4 | -2.7 | 11.7 | 4.1 | 3.2 | 23 | 74 | East Nth East | 0 | 0 | 1008.3 | 1020.5 | -12.2 |
| Morning frost. Clear and sunny with light winds. | ||||||||||||
| 5 | 1.9 | 11.4 | 7.8 | 9.2 | 36 | 210 | East Nth East | 0.5 | 0.5 | 979.1 | 1007.9 | -28.8 |
| Clear and sunny, NE winds. 0.5mm of rain from frost condensation. | ||||||||||||
| 6 | 2.5 | 14.8 | 7.8 | 0.7 | 12 | 15 | East Nth East | 0 | 0 | 974.4 | 983.9 | +9.5 |
| Mostly cloudy with light breezes during the day. | ||||||||||||
| 7 | 1.3 | 14.3 | 7.4 | 5.8 | 45 | 132 | East Nth East | 0 | 0 | 974.4 | 986.5 | -12.1 |
| Mostly cloudy with a few spots of rain in the afternoon and brief showers at night. | ||||||||||||
| 8 | 2.0 | 10.4 | 6.3 | 4.2 | 48 | 96 | East Nth East | 0.5 | 3.5 | 977.6 | 987.7 | +10.1 |
| Early southerly with showers clearing before dawn. Mostly sunny morning, cloud increasing in the afternoon, light winds during the day. | ||||||||||||
| 9 | 2.6 | 12.3 | 6.8 | 4.2 | 35 | 95 | North Nth East | 0.5 | 1.0 | 974.7 | 986.0 | -11.3 |
| Variable cloud with north to Ne winds, evening showers. | ||||||||||||
| 10 | 0.3 | 14.4 | 6.9 | 5.6 | 35 | 127 | North Nth West | 1.0 | 1.0 | 979.2 | 986.7 | -7.5 |
| High cloud increasing in the afternoon, winds variable between NE and nor'west. Evening showers. | ||||||||||||
| 11 | 0.5 | 11.8 | 7.1 | 6.9 | 37 | 159 | North Nth West | 1.0 | 2.0 | 974.8 | 984.5 | +9.7 |
| Morning showers clearing, mostly sunny from late morning. | ||||||||||||
| 12 | 0.1 | 11.6 | 5.0 | 5.8 | 38 | 130 | East Nth East | 0.5 | 0.5 | 973.7 | 989.2 | +15.5 |
| Morning showers clearing. Sunny afternoon. Cool north to NE winds. | ||||||||||||
| 13 | 2.4 | 13.3 | 7.6 | 5.8 | 39 | 134 | North Nth West | 0 | 0 | 984.5 | 990.1 | -5.6 |
| Variable cloud, mostly sunny afternoon, north to NE winds. | ||||||||||||
| 14 | 1.2 | 10.0 | 4.8 | 2.3 | 26 | 50 | South Sth West | 0 | 0 | 988.0 | 1001.1 | +13.1 |
| Some morning cloud then sunny with light winds. | ||||||||||||
| 15 | -1.3 | 9.0 | 3.7 | 5.5 | 36 | 110 | South Sth West | 0 | 0 | 1000.8 | 1010.4 | +9.6 |
| Variable cloud, southerly winds. | ||||||||||||
| 16 | 3.5 | 12.1 | 6.6 | 3.5 | 43 | 81 | South Sth West | 0 | 0 | 1008.7 | 1018.7 | +10.0 |
| Morning cloud breaking to a mostly sunny afternoon, fresh southerly winds in the afternoon. | ||||||||||||
| 17 | 2.3 | 12.3 | 6.6 | 2.1 | 18 | 48 | South Sth West | 0 | 0 | 1018.6 | 1028.1 | +9.5 |
| Clear and sunny with light breezes. | ||||||||||||
| 18 | 2.8 | 11.6 | 7.4 | 2.7 | 15 | 62 | East Nth East | 0 | 0 | 1027.5 | 1030.8 | +3.3 |
| Cloud and fog in the morning, clearing by midday. Light winds. | ||||||||||||
| 19 | 1.7 | 12.2 | 6.8 | 2.3 | 16 | 52 | South Sth West | 0 | 0 | 1026.7 | 1030.6 | -3.9 |
| Variable cloud, light winds | ||||||||||||
| 20 | -2.4 | 11.2 | 3.5 | 0.5 | 13 | 13 | South West | 0 | 0 | 1023.2 | 1027.6 | -4.4 |
| Mostly sunny with some high cloud in the afternoon. Light breezes. | ||||||||||||
| 21 | -0.1 | 9.5 | 4.7 | 2.8 | 25 | 63 | South Sth West | 0 | 0 | 1025.1 | 1029.7 | -4.6 |
| Mostly cloudy with light winds. | ||||||||||||
| 22 | -0.4 | 7.1 | 3.2 | 1.3 | 13 | 30 | South Sth West | 0 | 0 | 1016.5 | 1024.8 | -8.3 |
| Cloudy and cold with light southerly winds. | ||||||||||||
| 23 | 2.3 | 7.4 | 4.5 | 2.5 | 15 | 57 | South Sth West | 0 | 0 | 995.0 | 1016.3 | -21.3 |
| Overcast and cold with light southerly winds. | ||||||||||||
| 24 | 0.1 | 5.4 | 2.9 | 11.1 | 47 | 250 | South Sth West | 0.5 | 4.0 | 989.9 | 999.8 | +9.9 |
| Cloudy with sleet, hail and snow showers, snow later in the evening. cold southerly winds. | ||||||||||||
| 25 | -0.7 | 2.6 | 0.9 | 11.7 | 49 | 263 | South Sth West | 1.0 | 17.5 | 1000.2 | 1015.5 | +15.3 |
| Snow over night and through the morning with hail and rain showers later in the day. 9cm of snow in the back yard, 13cm on the deck. News reports this is the lowest maximum temperature for Christchurch since 1918. |
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| 26 | -4.0 | 6.9 | 1.6 | 2.4 | 24 | 55 | East Nth East | 0.5 | 0.5 | 1012.4 | 1016.7 | -4.3 |
| Heavy frost with very icy roads from melting snow refreezing. Sunny morning, cloud increasing in the afternoon. Light winds. | ||||||||||||
| 27 | -1.6 | 13.7 | 5.3 | 4.1 | 34 | 95 | North Nth West | 0 | 0 | 1007.0 | 1012.3 | -5.3 |
| Mostly sunny with milder nor'west winds. | ||||||||||||
| 28 | -1.3 | 14.3 | 5.4 | 1.6 | 16 | 35 | East Nth East | 0 | 0 | 1008.1 | 1013.9 | -5.8 |
| Afternoon cloud, light winds. | ||||||||||||
| 29 | 1.6 | 15.1 | 8.3 | 2.8 | 24 | 63 | East Nth East | 0 | 0 | 1001.3 | 1010.2 | -8.9 |
| Cloud from late morning to late afternoon, light NE winds in the morning, variable breezes in the afternoon. | ||||||||||||
| 30 | 1.8 | 8.6 | 6.5 | 8.6 | 45 | 194 | South Sth West | 0.5 | 0.5 | 1005.7 | 1023.2 | +17.5 |
| Early showers, broken cloud for most of the day with a cold southerly wind. | ||||||||||||
| 31 | -1.5 | 9.8 | 3.8 | 3.4 | 21 | 78 | East Nth East | 0 | 0 | 1019.2 | 1022.7 | -3.5 |
| Morning frost, clear and sunny with a cool NE wind. | ||||||||||||
