August 2012

Over the border and into Jurassic Coast of west Dorset.<br>A walk along the beach near Thorncombe Beacon on a hot and sunny August day.
Over the border and a visit to the Jurassic Coast of west Dorset.
A walk along the beach near Thorncombe Beacon on a hot and sunny August day.

Summary for  August 2012
Mean Max: 20.8C (-0.4C)
Mean Min: 13.8C (+1.8C)
Mean: 17.3C (+0.7C)
     
High Max: 26.4C 19th
Low Max: 17.2C 24th
High Min: 18.6C 15th
Low Min: 6.1C 31st
Mean Grass Min: 11.7C  
Grass Min: 4.0C 31st
     
Rain Total (gauge): 112.6 mm (234%)
Rain Total (tipping bucket): 101.6 mm (198%)
Rain Days >0.2 mm: 18 Days  
Rain Days >1.0 mm: 15 Days  
Max 24 hrs: 21.0 mm 15th
Days without any rain: 13  
     
Air Frost: 0 Days  
Grass Frost: 0 Days  
Snow Falling: 0 Days  
Snow (50%) @ 9am: 0 Days  
Ice Days: 0 Days  
Thunder Heard: 4 Days  
Hail <5 mm: 0 Days  
Hail >5 mm: 0 Days  
Fog @ 9am: 2 Days  
     
Total Monthly Sunshine: 167.4 Hours (72%)
Most Sunshine in a Day: 14.0 Hours 10th
Average Daily Sunshine: 5.4 Hours  
Sunless Days: 0 Days  
Cloudless Days: 1 Day  
Total Possible Sunshine: 448 Hours  
Percentage of Total Sun: 37%  
Maximum UV Index: 8.5 18th
Time of Max UV:   13:15
     
Mean Soil Temp @ 30 cm: N/A  
Min Soil Temp @ 30 cm: N/A  
Max Soil Temp @ 30 cm: N/A  
Mean Soil Temp @ 100 cm: N/A  
Min Soil Temp @ 100 cm: N/A  
Max Soil Temp @ 100 cm: N/A  
     
Mean 10 Min Wind >39 mph: 0.00 Days  
N: 2.01 Days  
NE: 0.11 Days  
E: 2.24 Days  
SE: 2.17 Days  
S: 14.99 Days  
SW: 3.04 Days  
W: 0.55 Days  
NW: 1.97 Days  
Calm: 3.92 Days  
Wind Chill Low: 5.3C 31st
Mean Wind: 3.5 mph  
Max Gust: 35 mph 15th
  31.00 Days  
Mean Cloud Cover: 58%  
Mean RH @ 9am: 95%  
Rain Duration >0.1mm/hour: 46.3 Hours  
Frost Duration: 0.0 Hours  
Max Frost Duration in a Day: 0.0 Hours 1st
     
Mean Sea Temperature: 18.0C (+0.6C)
Normal for Month: 17.4C  
Max Sea Temperature: 19.9C 9th
Min Sea Temperature: 16.3C 1st
     
Mean Pressure @ 9am: 1013.4 hPa (-3.9 hPa)
Mean Pressure: 1013.4 hPa (-3.9 hPa)
Max Pressure: 1031.8 hPa 30th
Min Pressure: 998.2 hPa 25th
   
Radiation Daily Mean: 11.6 MJ/m  
Max Daily Value: 21.5 MJ/m 10th
Min Daily Value: 3.7 MJ/m 24th
Number of Days with Data: 31 Days  
1-Hour Maximum: 957 W/m 2nd 
Starting Time of the Hour:   #N/A
     
Max Dewpoint: 20.5C 19th
Min Dewpoint: 4.4C 31st
Mean Dewpoint: 14.5C  
     
Max Humidity: 99% 28th
Min Humidity: 52% 31st
Mean Humidity: 85% (+7)

 

A generally warm but wet month with below average levels of sunshine.

A cool start and end to this August but warm from the 9th to the 22nd with plenty of sunshine, but also quite a lot of rain too. There were a few very warm nights mid-month, and the humidity was high making it feeling quite oppressive at times.

Rainfall was liberally spread throughout the month with the only 'lengthy' dry period being from the 18th to the 23rd. As with June and July, rainfall amounts were extremely high leading to the wettest summer recorded at this station.
As expected in a summer month, there were no air frosts or grass frosts. Thunder was heard on 4 occasions, which is rather typical for August. It was also foggy on two days due to regular influxes of tropical maritime air causing sea fog.
As with June and July, sunshine amounts were disappointing, but the low figure of 167 hours was not as bad as it appears. This was because the mornings were often cloudy but the sun broke through the cloud by midday, and the afternoons were generally quite sunny. This gave the impression of a month that was sunnier than the actual data suggests.
No soil temperature readings were taken due to relocation of sensors. These are planned to be installed in August 2012 and readings will commence at the beginning of September 2012.
The dominant wind direction was overwhelmingly from a southerly direction. This was due to frequent sea breezes and typical for a summer month at this location near the sea.
Rainfall duration was 48 hours, and representative of the wetter than normal nature of this month.
Sea surface temperatures gradually increased up until the 19th, then fell slightly to the end of the month. Overall though, the SSTs were above normal.
Mean pressure was below the average for August and indicative of the unsettled nature of this month.
A new sensor has been added that measures solar irradiance in watts per square metre falling on a horizontal surface.
Dewpoints were well above the average.
As with the dewpoints, the relative humidity was well-above normal.
Weather Data for Otter Valley, Devon.  August 2012  
  Temp (oC) Hum (RH%) Dewpoint (oC) Wind (mph) Rain Pressure (hPa) Grass Sun  
  Min Max Ave Min Max Ave Min Max Ave Max Ave Run mm Min Max Ave Min Hours Observations
1 15.1 20.6 17.9 75 98 87 13.6 17.8 15.7 25 4.9 116 2.6 1005 1012 1009 13.9 2.4 Sunny ints & light showers
2 11.7 21.3 16.5 69 98 84 10.3 17.1 13.7 21 3.6 86 8.4 1006 1011 1008 9.6 6.2 Sunny ints & light showers
3 12.1 19.9 16.0 76 98 87 10.6 16.1 13.4 25 5.1 121 0.0 1010 1012 1011 10.3 6.1 Sunny intervals all day
4 13.8 19.1 16.5 80 98 89 12.1 16.7 14.4 21 5.9 141 2.4 1007 1010 1008 11.0 5.1 Showers am, sunny ints pm
5 12.9 17.5 15.2 86 98 92 11.5 15.4 13.5 18 2.7 65 2.4 1004 1007 1006 11.2 0.7 Brief sunny intervals all day
6 12.2 18.4 15.3 67 98 83 10.8 14.8 12.8 13 1.6 39 0.6 1005 1014 1009 9.5 2.7 Sunny intervals all day
7 11.2 17.5 14.4 75 97 86 9.5 16.2 12.9 19 2.3 56 0.0 1014 1020 1017 10.1 0.3 Brief sunny intervals all day
8 16.3 20.9 18.6 83 97 90 15.4 18.7 17.1 9 1.2 29 1.2 1021 1023 1022 15.9 0.6 Brief sunny intervals all day
9 15.9 25.6 20.8 65 98 82 14.8 19.5 17.2 11 1.9 46 0.0 1023 1026 1024 13.8 10.4 Fog early am, then sunny
10 13.7 25.1 19.4 54 98 76 12.6 17.1 14.9 8 0.8 19 0.0 1023 1026 1024 12.5 14.0 Sunny all day
11 16.1 22.1 19.1 59 84 72 12.5 15.1 13.8 21 2.4 57 0.0 1013 1023 1018 13.3 10.8 Sunny ints. Thunder pm
12 15.9 22.3 19.1 69 97 83 12.8 18.4 15.6 19 3.0 71 8.8 1010 1013 1012 14.9 6.2 Tstorms night. Sunny ints
13 17.1 20.1 18.6 89 98 94 15.4 18.2 16.8 25 5.5 132 2.6 1008 1010 1009 13.2 3.2 Rain am, sunny ints pm
14 14.1 22.7 18.4 78 98 88 13.5 18.8 16.2 12 2.0 48 0.0 1008 1010 1009 12.7 6.7 Sunny intervals all day
15 18.6 20.0 19.3 75 97 86 14.3 17.1 15.7 35 7.0 168 21.0 1000 1008 1004 14.5 6.0 Rain am, sunny ints pm
16 15.2 20.7 18.0 79 96 88 13.6 17.3 15.5 26 7.9 190 2.6 1004 1014 1009 14.5 3.4 Cloudy am, sunny ints pm
17 16.1 22.6 19.4 75 98 87 15.1 19.0 17.1 25 6.4 154 14.0 1009 1012 1010 16.7 2.9 Rain am, sunny ints pm
18 16.7 23.7 20.2 78 97 88 15.3 20.1 17.7 13 3.0 71 0.0 1011 1015 1013 16.6 8.7 Sunny intervals all day
19 17.3 26.4 21.9 66 97 82 16.5 20.5 18.5 15 1.3 31 0.0 1014 1017 1015 14.7 4.7 Misty am, sunny ints pm
20 16.1 23.7 19.9 70 98 84 14.3 18.9 16.6 12 1.7 44 0.0 1016 1021 1018 13.8 8.6 Sunny intervals all day
21 14.7 21.0 17.9 70 98 84 12.4 17.3 14.9 17 2.4 59 0.0 1016 1021 1018 10.9 3.2 Sunny intervals all day
22 9.7 22.2 16.0 54 98 76 8.4 14.3 11.4 16 1.9 46 0.0 1018 1020 1019 8.5 7.3 Sunny intervals all day
23 10.3 19.6 15.0 73 98 86 9.1 15.2 12.2 16 2.0 49 0.0 1010 1019 1015 9.6 4.6 Sunny intervals all day
24 13.1 17.2 15.2 91 98 95 11.9 16.8 14.4 21 3.1 69 11.4 999 1010 1004 12.7 1.0 Cloudy am, rain pm
25 14.4 19.2 16.8 84 98 91 13.5 17.1 15.3 18 3.1 73 7.0 998 1009 1004 12.9 3.2 Sun & showers all day
26 11.8 20.2 16.0 61 98 80 10.9 15.4 13.2 15 2.1 51 0.8 1010 1018 1014 9.3 6.2 Sunny ints am, cloudy pm
27 15.1 18.3 16.7 89 98 94 11.6 16.8 14.2 28 7.0 168 6.8 1008 1018 1013 14.0 0.5 Brief sunny intervals all day
28 9.6 20.7 15.2 77 99 88 8.8 17.3 13.1 21 3.4 82 1.6 1008 1015 1011 8.2 7.3 Sunny intervals all day
29 13.6 18.3 16.0 74 99 87 12.4 16.0 14.2 24 7.1 171 18.0 1009 1014 1012 13.8 4.9 Rain am, sunny ints pm
30 11.6 18.6 15.1 60 98 79 8.8 13.9 11.4 21 3.5 84 0.4 1011 1027 1019 0.0 10.1 Sunny intervals all day
31 6.1 19.6 12.9 52 97 75 4.4 11.2 7.8 13 1.5 37 0.0 1027 1032 1030 0.0 9.3 Sunny intervals all day
13.8 20.8 17.3 73 97 85 12.2 16.9 14.5 19 3.5 2569 112.6 1010 1016 1013 12.5 167.4  

Graphs for August 2012

Figure 1. Temperature and Rainfall for August 2012.
Figure 2. Sunshine, UV Index and solar irradiance for August 2012.
Figure 3. Wind direction for August 2012.
Figure 4. Sea surface temperature & cooling/heating days for August 2012.
Figure 5. Mean wind speed, calm hours and air pressure for August 2012.