Temperature:
The mean temperature for the month was 9.9, the 3rd warmest May I've recorded, equal to 2003 and above my average of 9.1C. The warmest May I've recorded was 2007 with an average temperature of 11.6C.
The warmest day was the 13th with 23.9C, the minimum was 0.7C on the 5th. This was the 3rd May where I have not recorded an air frost (0C or below) the others being 2004 and 2007. My coldest May temperature to date is -6.2C on 31st May 2001
There were 5 days where the maximum temperature for the day was less than 10C, my average is 3. There were 10 days where the temperature was at or above 15C which equals my May average and 1 day where the temperature was at or above 20C, my average is 3.
Wind: (Records from 2001)
The monthly wind run of 4268km is 110% of my May average of 3866km making this May the third windiest May I've recorded. The least windy to date was 2003 with 3185km. The windiest May was 2009 with 5291km. The highest gust was 54km/h from the south south west on the 26th.
Rainfall:
May had 160.5mm of rain over 11 days, 203% of my 79mm May average, the 3rd wettest May I've recorded. I had not recorded any rain in the first 14 days of the month. The wettest day was the 26th with 57mm. My wettest May day was 12th May 2006 with 74.6mm. The wettest May was 2009 with 192.8mm, the driest, 2007 with 21.2mm.
Barometer: (Records from 2006)
The average pressure for the month was close to my May average of 1014.3 hPa with 1014.1 hPa. Maximum pressure change of +19.9 hPa is above my May average of 16.0 hPa.
NIWA monthly climate summaries can be seen here.
| May 2010 Summary Temperature |
|
|---|---|
| Mean | 9.9 C |
| Mean Maximum | 13.9 C |
| Mean Minimum | 6.5 C |
| Maximum High | 23.9 C (13th) |
| Maximum Low | 11.5 C (12th) |
| Minimum High | 6.6 C (28th) |
| Minimum Low | 0.7 C (5th) |
| Wind Speed and Direction | |
| Maximum Gust | 54 km/h (26th) |
| Mean | 6.1 km/h |
| Wind Run | 4268 km |
| Max Daily Windrun | 402 km (28th) |
| Prevailing Direction | South Sth West |
| Barometer | |
| Maximum | 1032.8 hPa (5th) |
| Minimum | 987.0 hPa (25th) |
| Mean | 1014.1 hPa |
| Max Daily Change | +19.9 hPa (26th) |
| Rainfall | |
| Days with Measured Rainfall (Greater than 0.2mm) |
11 |
| Max Daily Rainfall | 57.5 mm (26th) |
| Monthly Rainfall | 160.5 mm |
| Humidity | |
| Maximum |
100 % (Several Days) |
| Minimum | 33 % (13th) |
| May 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 | 4.5 | 14.6 | 9.1 | 4.4 | 31 | 100 | South Sth West |
0 | 0 | 1007.5 | 1022.4 | +14.9 |
| Sunny at first, cloud increasing with a cool southerly wind and a few spots of rain. |
||||||||||||
| 2 | 3.3 | 13.6 | 9.4 | 4.8 | 28 | 110 | East Nth East | 0 | 0 | 1019.5 | 1025.4 | -5.9 |
| Some cloud but mostly sunny with NE winds. | ||||||||||||
| 3 | 7.6 | 19.4 | 11.9 | 2.8 | 20 | 63 | East Nth East | 0 | 0 | 1012.3 | 1019.5 | -7.2 |
| Overcast and cool in the morning. Cloud breaking in the afternoon with mild northerly breezes. | ||||||||||||
| 4 | 4.5 | 15.0 | 9.1 | 3.0 | 27 | 70 | South Sth West | 0 | 0 | 1017.8 | 1032.0 | +14.2 |
| Sunny with cool southerly breezes. | ||||||||||||
| 5 | 0.7 | 13.8 | 8.4 | 7.5 | 38 | 170 | East Nth East | 0 | 0 | 1026.7 | 1032.8 | -6.1 |
| Coldest morning of the year to date. Sunny with fresh NE winds in the afternoon. | ||||||||||||
| 6 | 7.5 | 19.5 | 12.3 | 3.9 | 22 | 88 | East Nth East | 0 | 0 | 1016.9 | 1026.7 | -9.8 |
| Sunny with mild temperatures in the adternoon, light breezes. | ||||||||||||
| 7 | 10.8 | 17.8 | 14.1 | 3.0 | 34 | 66 | East Nth East | 0 | 0 | 1010.4 | 1016.5 | -6.1 |
| Overcast with light NE winds turning NW for a time in the afternoon. | ||||||||||||
| 8 | 7.9 | 13.8 | 11.7 | 5.9 | 34 | 133 | South Sth West | 0 | 0 | 1007.7 | 1014.8 | +7.1 |
| Overcast with some light drizzle and cool southerly winds. | ||||||||||||
| 9 | 1.8 | 17.7 | 9.5 | 3.4 | 23 | 76 | East Nth East | 0 | 0 | 1012.7 | 1018.3 | +5.6 |
| Clear and sunny with light winds. | ||||||||||||
| 10 | 7.3 | 18.0 | 12.0 | 7.9 | 31 | 179 | East Nth East | 0 | 0 | 1016.2 | 1022.5 | +6.3 |
| Some morning cloud but mostly sunny with NE winds turning southerly later in the afternoon. | ||||||||||||
| 11 | 1.9 | 14.9 | 8.8 | 4.6 | 33 | 104 | East Nth East | 0 | 0 | 1018.4 | 1024.4 | -6.0 |
| Some morning cloud, sunny with a light NE wind freshening in the evening. | ||||||||||||
| 12 | 11.5 | 15.6 | 13.3 | 14.0 | 37 | 321 | East Nth East | 0 | 0 | 1003.1 | 1018.3 | -15.2 |
| Cloud increasing in the afternoon and becoming overcast. Fresh NE winds. | ||||||||||||
| 13 | 9.9 | 23.9 | 16.1 | 10.2 | 44 | 233 | East Nth East | 0 | 0 | 992.6 | 1002.8 | -10.2 |
| Morning cloud clearing. Fresh NE winds easing and turning mild northerly in the afternoon. | ||||||||||||
| 14 | 7.8 | 19.4 | 12.3 | 1.5 | 16 | 34 | East Nth East | 0 | 0 | 998.9 | 1002.5 | -3.6 |
| Cloud increasing during the day. Light winds, southerly in the morning, NE in the afternoon. | ||||||||||||
| 15 | 5.3 | 15.1 | 9.9 | 5.0 | 27 | 114 | South Sth West | 0.5 | 0.5 | 998.1 | 1001.8 | +3.7 |
| Low cloud clearing late morning and returning late afternoon, evening showers. Southerly winds | ||||||||||||
| 16 | 9.1 | 12.0 | 10.3 | 8.5 | 26 | 191 | South Sth West | 0.5 | 5.5 | 1001.1 | 1006.7 | +5.6 |
| Overcast with low cloud and light rain. Southerly winds. | ||||||||||||
| 17 | 9.6 | 10.8 | 10.2 | 9.9 | 29 | 221 | South Sth West | 0.5 | 7.0 | 1006.4 | 1010.9 | +4.5 |
| Overcast and cool with rain and drizzle. | ||||||||||||
| 18 | 7.9 | 13.0 | 10.1 | 3.1 | 22 | 70 | South West | 0.5 | 0.5 | 1010.8 | 1013.7 | +2.9 |
| Overcast with morning drizzle, light southerly winds. | ||||||||||||
| 19 | 8.8 | 12.2 | 10.0 | 3.8 | 25 | 88 | South Sth West | 0.5 | 1.0 | 1013.2 | 1020.8 | +7.6 |
| Overcast and cool with drizzle morning and evening, light southerly winds. | ||||||||||||
| 20 | 8.8 | 13.0 | 10.1 | 0.2 | 9 | 5 | South Sth West | 0 | 0 | 1019.1 | 1021.5 | +2.4 |
| Overcast and cool, little air movement. | ||||||||||||
| 21 | 5.6 | 13.3 | 8.8 | 1.5 | 17 | 33 | South West | 1.5 | 5.5 | 1019.8 | 1022.1 | -2.3 |
| Cloud breaking in the morning with sunny intervals. Cloud increasing in the afternoon with a period of rain. Light winds. | ||||||||||||
| 22 | 4.2 | 12.2 | 8.8 | 5.4 | 28 | 107 | East Nth East | 0 | 0 | 1014.9 | 1020.9 | -6.0 |
| Broken cloud, mostly sunny, cool NE wind. | ||||||||||||
| 23 | 7.4 | 12.8 | 9.6 | 3.7 | 22 | 83 | South Sth West | 0 | 0 | 1015.1 | 1019.6 | +4.5 |
| Overcast with southerly winds, a few spots of rain from mid afternoon. | ||||||||||||
| 24 | 8.6 | 12.8 | 10.5 | 4.7 | 29 | 106 | South West | 1.5 | 16.5 | 999.8 | 1018.7 | -18.9 |
| Showers, some heavy. NE winds turning southerly. | ||||||||||||
| 25 | 9.8 | 12.6 | 10.8 | 9.0 | 43 | 190 | South Sth West | 1.5 | 16.0 | 987.0 | 998.6 | -11.6 |
| Overcast with rain for much of the day, southerly winds. | ||||||||||||
| 26 | 7.3 | 11.5 | 9.9 | 17.1 | 54 | 393 | South Sth West | 2.0 | 57.5 | 987.5 | 1007.4 | +19.9 |
| Rain, heavy in the morning and early afternoon causing some flooding around the city. Cold southerly winds, strong in the evening with showers. | ||||||||||||
| 27 | 3.7 | 7.8 | 5.6 | 13.5 | 49 | 301 | South Sth West | 1.5 | 10.0 | 1007.5 | 1016.8 |
+9.3 |
| Showers, some with hail, cold southerly wind. | ||||||||||||
| 28 | 3.6 | 6.6 | 5.1 | 18.9 | 50 | 402 | South Sth West | 1.0 | 32.0 | 1013.5 | 1016.2 | -2.7 |
| Rain with a strong southerly wind easing in the evening. | ||||||||||||
| 29 | 5.8 | 8.7 | 7.1 | 5.5 | 32 | 120 | South Sth West | 1.0 | 8.0 | 1015.7 | 1023.5 | +7.8 |
| Showers and drizzle, mostly light but cold southely wind. | ||||||||||||
| 30 | 5.3 | 9.5 | 7.1 | 1.4 | 15 | 32 | South Sth West | 0 | 0 | 1023.5 | 1026.6 | +3.1 |
| Overcast with light southerly winds. | ||||||||||||
| 31 | 2.5 | 9.7 | 6.6 | 2.1 | 18 | 47 | East Nth East | 0 | 0 | 1023.5 | 1027.4 | -3.9 |
| Mostly cloudy with light north to NE winds. | ||||||||||||
