Weather report for September 2014

September 2014 was the second driest month and the least windy month ever at Bracken House. Temperatures were above normal, though not as warm as September 2011. The average temperature was identical to that of August 2014.

The maximum temperature recorded in the month was 21.8°C on the 18th at 17:10, with the minimum being 5.2°C on the 22nd at 04:19. The average temperature for the month was 14.2°C, 0.7°C more than the September mean of 13.5°C. The average high temperature was 18.7°C, also the same as August, and the average low temperature was 10.2°C. A run of 26 days of below 20°C maximum temperatures ended on the 5th when the thermometer reached 20.3°C at 14:28. Despite the lack of rain and wind, September was a dull month with only 76.6 hours of sun, compared to 93.2 hours in August and 84.5 hours in September 2013. The average dew point was 11.8°C and the maximum heat index was 24.7°C at 16:34 on the 9th.

Only 10.0 millimetres of rain fell in the month, making it the second driest month here behind April 2011, when 6.8 millimetres was recorded. If it wasn’t for a few sharp showers on the 29th, when 4.0 millimetres of rain was recorded, September 2014 would have been the driest month here. Rain was recorded on 11 days, a new low for September. Evapotranspiration for the month was 50.5 millimetres, 2.6 millimetres less than 2013. There has now been 396 millimetres of rain in 2014, 1.6 millimetres more than average for the end of September.

The highest wind speed recorded was 11.5 mph from 315° (NW) on the 26th at 11:04, and the highest gust speed was 18.4 mph from 293° (WNW) on the 26th at 12:34. The average wind speed was 1.6 mph, and the average gust speed was 3.1 mph, all of these are all-time station lows. The total wind run was only 1100.7 miles.

A couple of September humidity records were broken. The minimum humidity of 53% at 17:03 on the 7th was the highest minimum recorded in September and the month average of 86% is also a September high.

The highest barometric pressure was 1028.2 millibars on the 13th at 10:56, and the minimum pressure was 1009.7 millibars on the 18th at 17:13. The month average pressure was 1019.5 millibars, a record high for September.

Weather Underground graph for September 2014