Summary for September 2017

Normally one of the best months of the year but not his time. Unusually
cool, cloudy and wet.

Mean Max: 18.9ºC
Mean Min: 10.5ºC
Mean: 14.7ºC

High Max: 23.1ºC 4th
Low Max: 16.9ºC 16th
High Min: 16.6ºC 4th
Low Min: 3.4ºC 22nd
Grass Min: 1.2ºC 22nd

Days 20°C 6 Days
Days 15°C 30 Days
Nights 10°C 16 Days
Nights 5°C 3 Days

Rain Total (gauge): 87.1 mm
Rain Days 0.2 mm: 21 Days
Rain Days 1.0 mm: 15 Days
Max 24 hrs: 21.1 mm 3rd
Days without any rain: 9

Thunder Heard: 1 Day 16th
Hail 5 mm: 1 Day 16th
Hail 5 mm: 0 Days
Fog @ 9am: 1 Day 18th

Total Monthly Sunshine: 137.0 Hours
Most Sunshine in a Day: 12.2 Hours 1st
Average Daily Sunshine: 4.6 Hours
Sunless Days: 3 Days
Cloudless Days: 1 Day 1st
Total Possible Sunshine: 378.1 Hours
Percentage of Total Sun: 36%

Mean Soil Temp @ 30 cm: 16.8ºC
Mean Soil Temp @ 100 cm: 16.2ºC

Ave 10 Min Wind 39 mph: 0.00 Days
Calm: 7.12 Days
Mean Wind: 3.8 mph
Max Gust: 37 mph 12th
Mean Cloud Cover: 57%

Mean Pressu 1014.0 hPa
Max Pressu 1025.2 hPa 2nd
Min Pressu 993.8 hPa 11th

Max Dewpoint: 19.7ºC 4th
Min Dewpoint: 3.0ºC 22nd
Mean Dewpoint: 12.2ºC

Max Humidity: 100% Several days
Min Humidity: 50% 1st
Mean Humidity: 86%

--
Nick Gardner
Otter Valley, Devon
20 m amsl
http://www.ottervalleyweather.me.uk