September 2011 Summary
Temperature
Mean 9.1 C
Mean Maximum 15.0 C
Mean Minimum 3.6 C
Maximum High 22.5 C (27th)
Maximum Low 10.0 C (30th)
Minimum High 10.8 C (15th)
Minimum Low -1.5 C (26th)
Wind Speed and Direction
Maximum Gust 49 km/h (1st)
Mean 6.0 km/h
Wind Run 4150 km
Max Daily Windrun 283 km (22nd)
Prevailing Direction East Nth East
Barometer
Maximum 1030.3 hPa (5th)
Minimum 981.6 hPa (12th)
Mean 1009.9 hPa
Max Daily Change -17.6 hPa (11th)
Rainfall
Days with Measured Rainfall
(Greater than 0.2mm)
11
Max Daily Rainfall 6.0 mm (13th)
Monthly Rainfall 29.0 mm
Humidity
Maximum
100 % (Several days)
Minimum 24 % (27th)

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 3.6 13.7 8.2 4.7 49 106 South Sth West 1.0 3.5 998.8 1012.6 +13.8
Early morning southerly with brief showers clearing to a mostly sunny day. Cloud increasing with another cold southerly with rain in the evening.
2 -0.1 12.3 5.8 3.3 24 73 South West 0.5 3.5 1011.8 1017.7 -5.9
Early showers clearing by dawn. Snow on the Port Hills. Cloud clearing to a sunny and cool day with southerly winds.
3 -1.1 16.6 6.8 1.5 19 34 East Nth East 0 0 1013.1 1022.9 +9.8
Clear and sunny with light southerly breezes turning NE later in the afternoon.
4 1.2 16.1 8.1 1.8 20 40 East Nth East 0 0 1022.4 1030.0 +7.6
Morning cloud breaking and becoming sunny with light southerly breezes. Light NE winds in the afternoon with increasing cloud.
5 3.6 15.2 9.7 5.8 26 134 East Nth East 0 0 1026.5 1030.3 -3.8
Clear and sunny with NE winds
6 3.0 14.0 7.9 7.5 30 171 South Sth West 0.5 0.5 1026.2 1029.3 +3.1
Morning fog clearing to a sunny day with a cool southerly wind. Wind turning light northerly from late afternoon.
7 5.1 11.8 9.0 9.5 37 218 East Nth East 0 0 1015.7 1027.9 -12.2
Mostly cloudy with a fresh cool NE wind.
8 3.4 19.3 10.6 2.6 28 59 East Nth East 0 0 1008.9 1015.7 -6.8
Cloudy with light North to NE winds.
9 6.4 19.2 10.5 4.4 24 100 East Nth East 0 0 1007.7 1011.2 +3.5
Mostly sunny with southerly winds turning NE from midday.
10 5.9 19.4 12.6 8.1 37 187 East Nth East 0 0 999.1 1008.5 -9.4
Overcast with mild northerly winds.
11 9.3 14.4 11.9 9.0 31 206 East Nth East 0 0 982.2 999.8 -17.6
Overcast with cool NE winds.
12 3.1 16.0 9.5 5.9 45 135 South Sth West 0.5 1.5 981.6 992.1 +10.5
Sunny morning, becoming overcast from mid afternoon with showers and cooler southerly winds.
13 1.1 12.1 7.1 8.5 37 193 South Sth West 1.0 6.0 992.1 997.8 +5.7
Sunny morning with cool southerly winds. Cloud increasing in the afternoon with rain in the evening.
14 -0.9 12.9 5.9 5.0 37 115 South Sth West 0 0 997.9 1001.6 +3.7
Sunny with cool southerly winds.
15 2.9 10.8 6.8 6.9 48 157 East Nth East 0.5 2.5 990.4 997.9 -7.5
Cloudy with a cold southerly change from mid morning with afternoon showers.
16 0.0 15.0 7.8 3.1 24 70 South Sth West 0.5 0.5 992.4 1002.0 +9.6
Some cloud during the day, increasing from late afternoon with light showers in the evening.
17 3.3 12.4 8.3 5.8 26 133 East Nth East 0 0 1001.8 1005.8 +4.0
Some high cloud, increasing in the afternoon. Cool NE winds.
18 3.4 16.9 9.8 6.4 32 146 East Nth East 0 0 1002.3 1009.6 -7.3
Sunny and mild with light southerly breezes in the morning. wind turning cooler NE in the afternoon with increasing cloud.
19 4.1 11.9 7.7 4.1 31 93 South Sth West 0.5 3.5 999.8 1014.1 +14.3
Overcast with showers from midday, southerly winds.
20 3.3 11.4 7.3 7.3 34 166 South Sth West 1.5 2.5 1014.4 1020.4 +6.0
Early showers clearing before dawn. Partly cloudy with a cool southerly wind.
21 4.1 11.2 7.8 7.6 35 174 East Nth East 0 0 1011.6 1018.6 -7.0
Some cloud but mostly clear and sunny with a cool NE wind.
22 7.8 12.3 10.0 12.3 43 283 East Nth East 0 0 1009.2 1016.9 +7.7
Cloudy with a fresh, cool NE wind
23 4.9 15.8 10.5 6.0 29 138 East Nth East 0 0 1009.7 1019.1 -9.4
Some cloud but a mostly sunny day with NE winds from late morning.
24 7.5 20.3 12.4 8.5 46 195 East Nth East 0 0 999.4 1009.5 -10.1
High cloud at times with mild north to NW winds from late morning. A cool southerly change arrived late afternoon.
25 1.6 12.2 6.6 6.7 29 144 South Sth West 0.5 4.0 1007.3 1014.5 +7.2
Morning showers. Cloud breaking for a while with sunny intervals but becoming overcast from mid afternoon with further showers in the evening.
26 -1.5 16.2 7.6 3.9 27 89 East Nth East 0 0 1013.3 1015.4 +2.1
Some cloud but mostly sunny with light southerly winds turning cooler NE from evening.
27 2.7 22.5 11.9 3.0 23 68 East Nth East 0 0 1010.0 1015.1 -5.1
Partly cloudy and mild with light north to NW winds turning southerly in the evening.
28 6.1 20.2 12.4 4.0 23 91 East Nth East 0 0 1011.5 1015.6 +4.1
Some cloud but mostly sunny with variable breezes turning NE later in the afternoon
29 5.5 13.5 9.8 6.0 31 137 East Nth East 0 0 1015.8 1021.6 +5.8
Cloud breaking in the afternoon, cool NE winds.
30 10.0 14.5 11.7 12.2 44 280 East Nth East 0 0 1014.0 1019.3 -5.3
Morning cloud clearing to a sunny afternoon a with fresh cool NE wind.

September 2011 Temperature Graph
September 2011 Wind Dir Graph
September 2011 Wind Dir % Graph
September 2011 Wind Speed Graph
September 2011 Rainfall Graph
September 2011 Barograph
September 2011 Humidity Graph