September 2012 Summary
Temperature
Mean 10.2 C
Mean Maximum 15.9 C
Mean Minimum 5.1 C
Maximum High 23.4 C (30th)
Maximum Low 11.3 C (2nd)
Minimum High 10.0 C (12th)
Minimum Low -1.2 C (13th)
Wind Speed and Direction
Maximum Gust 76 km/h (17th)
Mean 7.4 km/h
Wind Run 5014 km
Max Daily Windrun 364 km (29th)
Prevailing Direction East Nth East
Barometer
Maximum 1033.3 hPa (22nd)
Minimum 978.9 hPa (8th)
Mean 1010.9 hPa
Max Daily Change +24.3 hPa (11th)
Rainfall
Days with Measured Rainfall
(Greater than 0.2mm)
10
Max Daily Rainfall 14.5 mm (17th)
Monthly Rainfall 36.0 mm
Humidity
Maximum
100 % (18th)
Minimum 31 % (30th)

September 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 8.6 19.4 12.1 8.4 28 192 East Nth East 0 0 1016.4 1020.2 -3.8
Mostly cloudy with mild nor'west winds around the middle of the day changing to cooler NE in the afternoon.
2 11.3 16.5 13.7 5.9 24 134 East Nth East 0 0 1006.1 1016.3 -10.2
Overcast with NE winds
3 7.4 13.5 9.5 7.7 25 147 South Sth West 0.5 0.5 993.3 1005.9 -12.6
Overcast with morning mist. A few spots of rain during the day, evening showers.
4 4.1 15.1 9.8 7.9 36 139 South Sth West 2.0 2.5 990.1 998.4 +8.3
Some cloud but mostly sunny. Evening thunder storm with some 15mm hail here, golf ball size hail reported in other areas of town.
5 2.0 19.9 11.4 5.6 32 128 North Nth West 0 0 998.4 1003.3 +4.9
Mostly cloudy with some sunny intervals, NE winds turning nor'west from late morning.
6 10.0 20.7 15.7 9.5 40 218 North Nth East 0 0 999.0 1006.0 -7.0
Overcast with mild north to nor'west winds.
7 11.2 23.1 16.6 8.8 42 201 East Nth East 0.5 1.0 996.4 999.7 -3.3
Mostly sunny with mild north to nor'west winds from mid morning. Cloud increasing from mid afternoon.
8 8.8 18.9 13.6 12.1 43 277 North Nth West 0 0 978.9 995.9 -17.0
Variable high cloud. Mild northerly winds turning cooler by late afternoon with a few spots of rain.
9 3.5 16.5 10.3 6.5 41 148 North Nth West 0 0 980.9 992.2 +11.3
Variable cloud increasing from mid afternoon. Northerly winds turning light southerly in the evening.
10 2.4 17.8 10.3 8.4 54 193 North Nth West 0 0 991.1 997.4 -6.3
Some high cloud but mostly sunny with gusty nor'west winds in the afternoon.
11 0.7 11.1 6.3 12.4 54 281 South Sth West 0.5 3.0 994.4 1018.7 +24.3
Sunny for most of the day. Cold southerly winds strengthening in the afternoon with showers, some with hail.
12 -0.2 10.0 4.6 8.2 44 175 South Sth West 1.0 12.0 1018.8 1024.8 +6.0
Dusting of snow on the Port Hills by dawn. Showers clearing in the afternoon along with the cloud and the southerly wind dieing away making a frosty evening.
13 -1.2 12.2 6.5 7.2 36 166 East Nth East 0.5 0.5 1011.7 1021.8 -10.1
Clear and sunny with a fresh cool NE wind.
14 2.3 18.8 10.9 6.8 44 155 East Nth East 0 0 1005.7 1011.3 -5.6
High cloud increasing and becoming overcast by late afternoon. Mild north to NW winds from late morning.
15 6.3 15.1 10.4 5.1 21 114 South Sth West 0 0 1006.8 1012.7 +5.9
Cloudy and cool with North to NE winds turning southerly form evening. A few spots of rain and drizzle in the afternoon.
16 7.6 15.1 9.8 7.0 24 146 South Sth West 0.5 0.5 1005.0 1013.7 -8.7
Morning drizzle clearing and becoming sunny for a while in the afternoon. Cloud increasing again from mid afternoon with southerly winds turning NE.
17 3.7 14.7 7.7 5.8 76 129 South Sth West 1.5 14.5 1001.8 1018.8 +17.0
Morning fog clearing mid morning then sunny. A strong cold southerly change arriving 4pm with rain and some thunder heard.
18 -0.5 12.5 6.8 6.5 33 149 East Nth East 0 0 1012.7 1018.1 +3.6
Clear and sunny with a cool NE wind.
19 3.1 14.8 9.0 5.2 24 119 East Nth East 0 0 1016.4 1021.3 +4.9
Sunny with southerly winds turning NE late afternoon.
20 5.9 11.1 7.8 5.5 31 125 South Sth West 0 0 1020.4 1031.6 +11.2
Overcast with light rain in the morning. Cloud breaking toward evening. Cold southerly winds turning NE in the evening.
21 3.3 12.1 7.5 4.3 23 97 East Nth East 0 0 1030.6 1032.4 +1.8
Morning cloud breaking to a sunny afternoon with a cool NE wind.
22 1.5 13.5 7.8 4.1 24 93 East Nth East 0 0 1030.3 1033.3 -3.0
Clear and sunny, light NE winds.
23 0.8 15.4 7.5 2.8 23 64 East Nth East 0 0 1027.5 1030.7 -3.2
Morning fog. Sunny with a few clouds, light southerly winds turning NE in the afternoon.
24 -0.7 12.9 7.7 9.4 46 215 East Nth East 0 0 1020.6 1027.9 -7.3
Variable cloud but a mostly sunny day with a fresh cool NE wind.
25 9.3 18.2 13.1 8.3 32 190 East Nth East 0 0 1011.4 1020.4 -9.0
Some cloud but mostly sunny with NE winds, mild in the afternoon
26 8.8 19.2 12.1 7.8 32 178 South Sth West 0.5 1.0 1009.3 1014.6 +5.3
Mild northerly winds turning cooler southerly by late morning and becoming overcast. Showers from mid afternoon.
27 7.4 16.2 10.4 4.1 25 92 South Sth West 0.5 0.5 1014.6 1022.7 +8.1
Variable cloud, southerly winds turning NE from mid afternoon with skies clearing.
28 7.2 14.0 10.7 9.8 39 224 East Nth East 0 0 1015.5 1022.0 -6.5
Morning and evening cloud, mostly sunny day, fresh NE wind.
29 9.5 14.7 11.3 15.9 47 364 East Nth East 0 0 1006.2 1016.1 -9.9
Variable cloud, fresh cool NE winds.
30 9.3 23.4 15.2 6.7 48 147 East Nth East 0 0 997.0 1005.7 -8.7
Mostly cloudy with NE winds turning mild nor'west in the afternoon.

September 2012 Temperature Graph
September 2012 Wind Dir Graph
September 2012 Wind Dir % Graph
September 2012 Wind Speed Graph
September 2012 Rainfall Graph
September 2012 Barograph
September 2012 Humidity Graph