December Summary
Well above average temperature, the warmest December in my records. Below average rainfall and about average wind run.
- December was well above my average temperature of 15.6C with 18.3C and is the warmest December I've recorded. The previous record was 17.4C in 2010. To show how warm December has been, only 4 years in January have reached or exceeded an average temperature of 18C.
- The coolest December is 2004 with 12.7C.
- The warmest temperature was 35.6C, a new December record
- The coldest temperature was 5.7C. The lowest December temperature I've recorded is in 2006 1.3C.
- All 31 days of the month reached or exceeded 15C, my average is 29.
- Twenty seven days reached or exceeded 20C, my average is 18.
- Fourteen days reached or exceeded 25C, my average is 7.
- Nine days reached or exceeded 30C, my average is 1.
- One day reached or exceeded 35C, my average is 0 but 2 other Decembers have achieved this, 2010 and 2015.
- Wind run was 97% of my average of 5788km with 5618km. The windiest December I've recorded was 2004 with 6940km.
- The barometer recorded above average pressure for the month with 1012.1hPa. My average is 1011.4hPa.
- Rainfall was 50% of my average expected total of 56.8mm with 28.5mm. The 2017 rainfall total is still above my long term average.The wettest December is 2004 with 137.8mm.
Note: Some corrections made to the data above on 3 Feb 2018.
| December 2017 Summary Temperature | |
|---|---|
| Mean | 18.3 C |
| Mean Maximum | 25.3 C |
| Mean Minimum | 12.7 C |
| Maximum High | 35.6 C (8th) |
| Maximum Low | 16.9 C (17th) |
| Minimum High | 15.8(26th) |
| Minimum Low | 5.7 C (29th) |
| Wind Speed and Direction | |
| Maximum Gust | 52 km/h (5th) |
| Mean | 7.9 km/h |
| Wind Run | 5618 km |
| Max Daily Windrun | 321 km (30th) |
| Prevailing Direction | East North East |
| Barometer | |
| Maximum | 1027.7 hPa (1st) |
| Minimum | 993.3 hPa (19th) |
| Mean | 1012.1 hPa |
| Max Daily Change | +14.6 hPa (19th) |
| Rainfall | |
| Days with Measured Rainfall (0.5mm or more) |
7 |
| Max Daily Rainfall | 11.5 mm (27th) |
| Monthly Rainfall | 28.5 mm |
| Humidity | |
| Maximum | 100 % (Several days) |
| Minimum | 17 % (10th) |
| December 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 | 15.5 | 23.9 | 19.2 | 9.5 | 28 | 216 | East Nth East | 0 | 0 | 1023.7 | 1027.7 | -4.0 |
| Clear and sunny with NE winds. | ||||||||||||
| 2 | 11.2 | 33.4 | 22.2 | 3.3 | 26 | 76 | East Nth East | 0 | 0 | 1015.3 | 1024.0 | -8.7 |
| Sunny and warm with light wind tending NE. | ||||||||||||
| 3 | 14.5 | 30.1 | 20.8 | 5.2 | 24 | 117 | South Sth West | 0 | 0 | 1015.0 | 1017.2 | +2.2 |
| Sunny and warm with light winds tending southerly. Wind turning cooler NE from mid afternoon with increasing thin high cloud. | ||||||||||||
| 4 | 13.8 | 28.2 | 20.3 | 5.5 | 30 | 126 | East Nth East | 0 | 0 | 1011.6 | 1017.1 | -5.5 |
| Some high cloud but mostly sunny and warm with NE winds. | ||||||||||||
| 5 | 12.5 | 32.4 | 21.9 | 5.0 | 29 | 113 | West | 0 | 0 | 1010.2 | 1019.9 | +9.7 |
| Very warm and sunny with light winds tending westerly | ||||||||||||
| 6 | 12.3 | 22.9 | 17.8 | 7.5 | 34 | 171 | East Nth East | 0 | 0 | 1018.8 | 1020.2 | -1.4 |
| Variable cloud with a mostly sunny afternoon, NE winds. | ||||||||||||
| 7 | 16.1 | 21.5 | 18.2 | 11.9 | 44 | 273 | East Nth East | 0 | 0 | 1013.7 | 1019.8 | -6.1 |
| Some drizzle patches. Morning cloud breaking to a mostly sunny afternoon with fresh NE winds. | ||||||||||||
| 8 | 15.0 | 35.6 | 23.7 | 5.5 | 30 | 124 | East Nth East | 0 | 0 | 1011.1 | 1013.7 | -2.6 |
| Clear, Sunny and hot with light winds in the morning turning slightly cooler NE in the afternoon. | ||||||||||||
| 9 | 16.2 | 33.3 | 24.4 | 4.9 | 35 | 111 | North Nth East | 0 | 0 | 1007.3 | 1012.9 | -5.6 |
| Variable cloud with sunny intervals, hot with north to nor'west winds. | ||||||||||||
| 10 | 15.5 | 32.2 | 24.1 | 7.5 | 34 | 169 | North Nth East | 0 | 0 | 1005.1 | 1010.5 | +5.4 |
| Variable high cloud, Warm northerly winds turning cooler westerly later in the afternoon. | ||||||||||||
| 11 | 11.2 | 30.0 | 20.7 | 4.4 | 34 | 99 | East Nth East | 0 | 0 | 1004.9 | 1010.1 | -5.2 |
| Sunny and warm with some high cloud and NE winds. | ||||||||||||
| 12 | 13.7 | 19.6 | 15.6 | 8.0 | 28 | 182 | East Nth East | 0.5 | 1.0 | 1005.7 | 1010.6 | +4.9 |
| Light showers from late morning clearing mid afternoon but remaining overcast. First recorded rainfall since the 8th November. | ||||||||||||
| 13 | 11.2 | 20.3 | 14.4 | 5.2 | 32 | 118 | East | 0.5 | 6.5 | 1007.3 | 1014.5 | +7.2 |
| Cloud increasing with NE winds from mid morning. Rain starting in the afternoon with showers later in the seeming. | ||||||||||||
| 14 | 8.2 | 20.0 | 14.6 | 7.8 | 39 | 177 | East Nth East | 0 | 0 | 1013.7 | 1017.7 | -3.7 |
| Few light showers in the morning. Cloud breaking in the afternoon with NE winds freshening. | ||||||||||||
| 15 | 14.4 | 25.4 | 19.8 | 7.7 | 30 | 176 | East Nth East | 0 | 0 | 1009.2 | 1015.1 | -5.9 |
| Variable cloud increasing in the afternoon with a few spots of rain, NE winds. | ||||||||||||
| 16 | 14.5 | 28.4 | 19.7 | 9.3 | 33 | 212 | East Nth East | 0 | 0 | 1014.1 | 1018.4 | +4.3 |
| Some morning high cloud, sunny and warm with light southerly winds turning NE from early afternoon. | ||||||||||||
| 17 | 16.9 | 28.6 | 22.0 | 8.0 | 31 | 182 | East Nth East | 0 | 0 | 1004.9 | 1014.1 | -9.2 |
| Sunny and warm morning. Cloud increasing in the afternoon. NE winds turning southerly in the evening. | ||||||||||||
| 18 | 13.1 | 21.7 | 15.8 | 11.0 | 37 | 250 | South Sth West | 0.5 | 0.5 | 1008.1 | 1015.9 | +7.8 |
| Showers clearing before dawn. Mostly cloudy with cooler southerly winds turning NE later in the afternoon. | ||||||||||||
| 19 | 12.3 | 24.3 | 16.8 | 10.0 | 46 | 228 | East Nth East | 0 | 0 | 993.3 | 1007.9 | -14.6 |
| Mostly cloudy, NE winds turning warm northerly from early afternoon then fresh southerly from late afternoon but remaining dry. | ||||||||||||
| 20 | 11.2 | 19.8 | 14.9 | 13.3 | 44 | 305 | South Sth West | 0 | 0 | 1003.9 | 1010.7 | +6.8 |
| Variable cloud, fresh southerly winds easing in the afternoon and turning NE in the evening. | ||||||||||||
| 21 | 11.8 | 21.2 | 15.5 | 12.1 | 43 | 277 | East Nth East | 0 | 0 | 1001.4 | 1012.3 | +10.9 |
| Cloudy with a fresh NE wind easing and turning southerly from late afternoon. | ||||||||||||
| 22 | 13.3 | 24.5 | 16.7 | 7.8 | 36 | 178 | East Nth East | 0.5 | 0.5 | 1012.6 | 1016.2 | +3.6 |
| Some morning drizzle. Cloud breaking to a sunny afternoon with NE winds. | ||||||||||||
| 23 | 13.7 | 21.0 | 17.0 | 12.7 | 44 | 289 | East Nth East | 0 | 0 | 1012.5 | 1016.8 | -4.3 |
| Variable cloud, fresh NE winds. | ||||||||||||
| 24 | 15.1 | 26.7 | 20.2 | 8.8 | 26 | 201 | East Nth East | 0 | 0 | 1005.4 | 1012.8 | -7.4 |
| Some cloud but mostly sunny, NE wind. | ||||||||||||
| 25 | 12.1 | 33.2 | 22.2 | 7.1 | 37 | 164 | North Nth West | 0.5 | 0.5 | 998.5 | 1005.5 | -7.0 |
| Sunny and very warm for much of the day. Cloud increasing later in the afternoon. A cooler southerly chane in the evening with a few showers. | ||||||||||||
| 26 | 9.9 | 15.8 | 12.9 | 7.2 | 30 | 163 | South Sth West | 1.5 | 8.0 | 1002.7 | 1016.0 | +13.3 |
| Overcast with showers, some heavy in the afternoon. Southerly winds. | ||||||||||||
| 27 | 8.6 | 17.1 | 12.4 | 8.0 | 35 | 183 | South Sth West | 1.0 | 11.5 | 1016.2 | 1023.4 | +7.2 |
| Morning showers clearng and cloud breaking to a mostly sunny afternoon with cool southerly winds. | ||||||||||||
| 28 | 6.8 | 20.4 | 13.8 | 4.4 | 27 | 101 | South Sth West | 0 | 0 | 1020.6 | 1023.7 | -3.1 |
| Early drizzle clearing and cloud breaking to a sunny afternoon, winds tending southerly. | ||||||||||||
| 29 | 5.7 | 22.7 | 14.1 | 5.2 | 26 | 117 | East Nth East | 0 | 0 | 1015.0 | 1022.5 | -7.5 |
| Mostly sunny but some high cloud in the afternoon. NE winds. | ||||||||||||
| 30 | 12.3 | 20.2 | 16.1 | 14.0 | 47 | 321 | East Nth East | 0 | 0 | 1001.5 | 1015.1 | -13.6 |
| Variable cloud, fresh NE wind. | ||||||||||||
| 31 | 14.4 | 30.4 | 19.7 | 8.1 | 52 | 185 | East Nth East | 0 | 0 | 998.0 | 1008.3 | +10.3 |
| Overcast and warm with north to NE winds. A fresh cool southerly arriving early evening but remaining dry. Maximim temperature recorded at 6pm. | ||||||||||||
