My September
Temperature: A mean temperature of 11.1C, this September equaled Sept 2002 as the 2 warmest Septembers I've recorded. The warmest day was the 15th with 23.6C with warm west to nor'west winds. The warmest September temperature I've recorded was 24.0C in 2001 with nor'west winds. Coldest temperature was-0.7C with a light frost morning on the 10th. The coldest September temperature I've recorded is -3.1C on 12th Sept 2000. (Note: old temperature sensor in operation at the time, reading low)
Wind: The monthly wind run of 4579km is the second lowest of the 5 Septembers I have records for. The windiest September was 2003 with a wind run of 5356km. Prevailing wind direction was north east recorded 37% of the month, south 33%, north 15%, south west 5%, west 5%, nor'west 4%, east and south east was about 1%. Maximum gust was 44km/h from the nor'west on the 2nd.
Rainfall: Just 1.8mm recorded on the 28th was the highest daily total for the month. The monthly total was just 5mm, the driest September I've recorded at my station, the previous low total being 24.8mm in 2001 The highest September total since 2000 at my station is 101mm in 2000 and the highest daily total is 48.8mm from melting snow on the 19th Sept 2005.
Barometer: The highest pressure for the month was recorded on the 26th and 27th with 1030.5 hPa, the lowest 998.1 hPa on the 19th. No previous barometer history. Humidity: Low humidity on the 18th Sept at 18% equals the humidity recorded on the 2nd January with mild westerly winds blowing.
| September 2006 Summary Temperature |
|
|---|---|
| Mean | 11.1 C |
| Mean Maximum | 17.5 C |
| Mean Minimum | 4.9 C |
| Maximum High | 23.6 C (15th) |
| Maximum Low | 9.4 C (24th) |
| Minimum High | 11.6 C (13th) |
| Minimum Low | -0.7 C (10th) |
| Wind Speed and Direction | |
| Maximum Gust | 44 km/h (2nd) |
| Mean | 6.4 km/h |
| Wind Run | 4579 km |
| Max Daily Windrun | 266 km (25th) |
| Prevailing Direction | North East |
| Barometer | |
| Maximum | 1030.5 hPa (26th) |
| Minimum | 998.1 hPa (19th) |
| Mean | 1014.0 hPa |
| Max Daily Change | +20.3 hPa (26th) |
| Rainfall | |
| Days with Measured Rainfall (Greater than 0.2mm) | 5 |
| Max Daily Rainfall | 1.8 mm (28th) |
| Monthly Rainfall | 5.0 mm |
| Humidity | |
| Maximum | 97 % (8th) |
| Minimum | 18 % (18th) |
| 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 | 5.8 | 15.8 | 11.1 | 8.4 | 40 | 198 | North East | 0 | 0 | 1010.2 | 1020.7 | -10.5 |
| Some high cloud with haze. Mostly sunny with a cool NE wind. | ||||||||||||
| 2 | 8.2 | 21.5 | 15.6 | 11.0 | 44 | 259 | North West | 0 | 0 | 1000.7 | 1014.7 | +14.0 |
| Overcast with high cloud in the morning with gusty nor'west winds. Cloud thinning and breaking later in the afternoon and the winds easing. | ||||||||||||
| 3 | 4.8 | 14.6 | 10.2 | 8.5 | 39 | 202 | North East | 0 | 0 | 1014.0 | 1019.1 | -5.1 |
| Clear and sunny with a cool NE wind. | ||||||||||||
| 4 | 3.9 | 22.1 | 13.3 | 5.0 | 33 | 119 | North West | 0 | 0 | 1006.7 | 1013.8 | -7.1 |
| Some cloud in the morning but mostly sunny. Cloud increasing in the afternoon. Mild nor'west winds turn NE at night. | ||||||||||||
| 5 | 6.7 | 15.0 | 11.5 | 3.7 | 26 | 88 | North East | 0.2 | 0.4 | 1005.3 | 1010.6 | -5.3 |
| Overcast for most of the day with light showers and drizzle in the morning. Cloud breaking late afternoon. | ||||||||||||
| 6 | 5.2 | 18.2 | 11.6 | 5.0 | 26 | 118 | North | 0 | 0 | 1006.2 | 1015.2 | +9.0 |
| Some cloud during the day but mostly sunny. Cloud increasing in the evening. | ||||||||||||
| 7 | 3.9 | 13.1 | 8.9 | 5.8 | 35 | 137 | North East | 0 | 0 | 1010.3 | 1016.3 | -6.0 |
| Low cloud lifting and breaking later in the afternoon. Cloud clearing in the evening. Cool NE wind. | ||||||||||||
| 8 | 4.6 | 14.3 | 8.9 | 7.7 | 29 | 183 | South | 0.2 | 0.8 | 1011.0 | 1017.4 | +6.4 |
| Some morning low cloud clearing to a sunny day with broken high cloud for a time in the afternoon. Cloud increasing again later in the afternoon with evening showers. | ||||||||||||
| 9 | 2.7 | 14.4 | 8.3 | 7.4 | 39 | 175 | South | 0 | 0 | 1011.8 | 1017.9 | +6.1 |
| Broken cloud in the morning lowering around the Port Hills for a time at midday then rising again. Mostly overcast in the afternoon. NE winds in the morning turning cooler southerly around midday. | ||||||||||||
| 10 | -0.7 | 15.0 | 7.3 | 2.8 | 22 | 67 | North East | 0 | 0 | 1014.7 | 1018.9 | -4.2 |
| Clear and sunny with morning frost. Light breezes tending southerly for most of the day. A cooler NE wind from later in the afternoon. | ||||||||||||
| 11 | 0.9 | 13.4 | 6.5 | 4.4 | 30 | 105 | South | 0 | 0 | 1014.6 | 1019.2 | +4.6 |
| Morning frost. Cool with a southerly breeze and broken cloud clearing late afternoon. | ||||||||||||
| 12 | 2.0 | 17.4 | 9.3 | 4.3 | 23 | 101 | North East | 0.8 | 1.6 | 1006.8 | 1017.5 | -10.7 |
| Cool southerly winds in the morning turning NE in the afternoon. Sunny for much of the day, cloud increasing from mid afternoon with evening showers. | ||||||||||||
| 13 | 2.7 | 11.6 | 7.7 | 6.7 | 31 | 158 | South | 0 | 0 | 1012.7 | 1023.2 | +10.5 |
| Overcast with light morning showers. Cloud clearing later in the afternoon. Cool southerly wind easing in the evening. | ||||||||||||
| 14 | 2.9 | 18.7 | 10.1 | 5.1 | 21 | 119 | North East | 0 | 0 | 1019.3 | 1023.6 | -4.3 |
| Sunny with thin high cloud. Mild northerly breezes turning cooler NE in the afternoon. | ||||||||||||
| 15 | 3.0 | 23.6 | 12.8 | 2.2 | 21 | 52 | North | 0 | 0 | 1014.9 | 1019.9 | -5.0 |
| Some high cloud in the morning but sunny in the afternoon. Mild but light north to nor'west breezes. | ||||||||||||
| 16 | 7.3 | 21.5 | 13.3 | 8.5 | 41 | 200 | West | 0 | 0 | 1001.9 | 1014.8 | -12.9 |
| High cloud clearing by midday, westerly winds, gusty at times. | ||||||||||||
| 17 | 1.7 | 16.6 | 8.5 | 4.1 | 29 | 96 | South | 0 | 0 | 1004.9 | 1013.8 | +8.9 |
| Sunny and mild morning with light southerly breezes. A change to colder NE winds in the afternoon with increasing cloud. A few spots of rain in the evening. | ||||||||||||
| 18 | 1.2 | 19.3 | 10.2 | 3.0 | 24 | 70 | West | 0 | 0 | 1010.4 | 1015.2 | -4.8 |
| Clear and sunny with mild westerly breezes. | ||||||||||||
| 19 | 0.8 | 20.4 | 10.3 | 4.5 | 32 | 107 | West | 0 | 0 | 998.1 | 1013.6 | -15.5 |
| Mostly overcast with high cloud but cloud breaking in the afternoon. Cool morning but mild in the afternoon with west to nor'west winds. | ||||||||||||
| 20 | 4.5 | 15.1 | 11.0 | 8.1 | 40 | 189 | North East | 0 | 0 | 1004.3 | 1012.3 | -8.0 |
| High cloud increasing, cool NE wind. | ||||||||||||
| 21 | 8.0 | 21.0 | 15.5 | 7.1 | 43 | 168 | North West | 0 | 0 | 999.9 | 1009.1 | +9.2 |
| Nor'west winds early morning followed by a southerly change and a light shower. Sunny morning but becoming overcast in the afternoon with high cloud. West to npr'west winds. | ||||||||||||
| 22 | 8.8 | 21.8 | 14.4 | 6.5 | 30 | 155 | North East | 0 | 0 | 1005.3 | 1016.2 | +10.9 |
| Cloud increasing in the morning but clearing again by midday. Light southerly winds in the afternoon turning cooler NE in the evening. | ||||||||||||
| 23 | 8.8 | 17.7 | 13.5 | 8.8 | 33 | 208 | North East | 0 | 0 | 1011.7 | 1018.4 | -6.7 |
| Some high cloud in the morning. Becoming overcast in the afternoon with a change to cooler NE winds. | ||||||||||||
| 24 | 9.4 | 20.0 | 14.2 | 7.6 | 39 | 180 | North | 0 | 0 | 1010.5 | 1022.2 | +11.7 |
| Early morning shower then mild nor'west breezes for a time turning cooler southerlymid morning. Becoming overcast from mid afternoon with a change to N to NE winds. | ||||||||||||
| 25 | 9.2 | 20.1 | 14.8 | 11.3 | 41 | 266 | North East | 0 | 0 | 1010.2 | 1021.4 | -11.2 |
| Overcast with high cloud. A fresh NE wind in the morning easing and turning mild NW later in the afternoon. | ||||||||||||
| 26 | 7.3 | 14.8 | 11.5 | 4.7 | 30 | 110 | South East | 0.2 | 0.4 | 1010.2 | 1030.5 | +20.3 |
| Overcast with showers later in the morning. Cool southerly wind turning north to NE in the afternoon. | ||||||||||||
| 27 | 5.9 | 14.6 | 10.3 | 10.3 | 41 | 244 | North East | 0 | 0 | 1027.9 | 1030.5 | -2.6 |
| Morning cloud breaking early afternoon with fresh, cool NE winds. | ||||||||||||
| 28 | 8.1 | 13.6 | 9.9 | 8.8 | 29 | 208 | North East | 0.2 | 1.8 | 1016.3 | 1028.8 | -12.5 |
| Morning showers and drizzle. Cloud breaking in the afternoon and mostly sunny with a cool NE wind. | ||||||||||||
| 29 | 1.6 | 18.3 | 9.9 | 7.6 | 34 | 179 | North East | 0 | 0 | 1015.0 | 1019.1 | +4.1 |
| Sunny with little cloud. Cool NE winds in the afternoon. | ||||||||||||
| 30 | 7.1 | 20.3 | 13.4 | 4.2 | 31 | 100 | North East | 0 | 0 | 1009.5 | 1016.1 | -6.6 |
| Mostly overcast but some weak sun early afternoon. Mild west to nor'west winds in the afternoon turning NE in the evening. | ||||||||||||
