July 2012

Crystal clear water at one of the many little beaches found along the south Devon coastline. Perfect for a cooling swim on a hot July day.
Crystal clear water at one of the many little, quiet beaches found along the south Devon coastline.
Perfect for a cooling swim on a hot and humid July day.

Summary for  July 2012
Mean Max: 20.3C (-1.2C)
Mean Min: 11.6C (-0.7C)
Mean: 15.9C (-1.0C)
     
High Max: 28.5C 25th
Low Max: 14.6C 7th
High Min: 15.1C 17th
Low Min: 7.3C 30th
Mean Grass Min: 10.6C  
Grass Min: 5.6C 30th
     
Rain Total (gauge): 123.6 mm (300%)
Rain Total (tipping bucket): 122.8 mm (297%)
Rain Days >0.2 mm: 15 Days  
Rain Days >1.0 mm: 11 Days  
Max 24 hrs: 50.8 mm 7th
Days without any rain: 15  
     
Air Frost: 0 Days  
Grass Frost: 0 Days  
Snow Falling: 0 Days  
Snow (50%) @ 9am: 0 Days  
Thunder Heard: 3 Days  
Hail <5 mm: 0 Days  
Hail >5 mm: 0 Days  
Fog @ 9am: 1 Days  
     
Total Monthly Sunshine: 185.7 Hours (80%)
Most Sunshine in a Day: 14.9 Hours 24th
Average Daily Sunshine: 6.0 Hours  
Sunless Days: 3 Days  
Cloudless Days: 5 Days  
Total Possible Sunshine: 494.5 Hours  
Percentage of Total Sun: 38%  
Maximum UV Index: 8.9 17th
Time of Max UV:   13:00
     
Mean Soil Temp @ 30 cm: N/A  
Min Soil Temp @ 30 cm: N/A 13th
Max Soil Temp @ 30 cm: N/A 26th
Mean Soil Temp @ 100 cm: N/A  
Min Soil Temp @ 100 cm: N/A 13th
Max Soil Temp @ 100 cm: N/A 26th
     
Mean 10 Min Wind >39 mph: 0.01 Days  
N: 4.83 Days  
NE: 0.30 Days  
E: 0.83 Days  
SE: 1.26 Days  
S: 9.99 Days  
SW: 4.68 Days  
W: 1.32 Days  
NW: 4.72 Days  
Calm: 3.07 Days  
Wind Chill Low: 6.7C 21st
Mean Wind: 2.9 mph  
Max Gust: 31 mph 7th
  31.00 Days  
Mean Cloud Cover: 70%  
Mean RH @ 9am: 93%  
Rain Duration >0.1mm/hour: 58.0 Hours  
Frost Duration: 0.0 Hours  
Max Frost Duration in a Day: 0.0 Hours 1st
     
Mean Sea Temperature: 16.2C (-1.2C)
Normal for Month: 17.4C  
Max Sea Temperature: 19.5C 24th
Min Sea Temperature: 14.8C 16th
     
Mean Pressure @ 9am: 1013.5 hPa (-3.9 hPa)
Mean Pressure: 1013.4 hPa (-4.0 hPa)
Max Pressure: 1026.9 hPa 22nd 
Min Pressure: 999.0 hPa 7th
   
Radiation Daily Mean: 16.49 MJ/m  
Max Daily Value: 30.18 MJ/m 23rd 
Min Daily Value: 3.36 MJ/m 7th
Number of Days with Data: 31 Days  
1-Hour Maximum: 1247 W/m 14th
Starting Time of the Hour:   13:00
     
Max Dewpoint: 18.2C 25th
Min Dewpoint: 6.0C 30th
Mean Dewpoint: 12.7C  
     
Max Humidity: 99% 3rd 
Min Humidity: 43% 30th
Mean Humidity: 81% (+5)

 

Cool, wet and very dull for the first two weeks, then warm, dry and sunny.

The warm and sunny weather from the 17th onwards saved this month from being as dreadful as June, though the month was still below average regarding temperature.

The first two weeks were extremely wet with 115 mm falling. 51 mm of rain fell on just 1 day (7th) leading to serious flooding problems. The second half of the month was much drier with just 8.4 mm of rain falling.
As expected in a summer month, there were no air frosts or grass frosts. Thunder was heard on 3 occasions, which is rather typical for July.
Despite a very sunny 2nd half to the month, the extremely dull conditions of the 1st half meant that the sunshine levels still ended up below normal (80%). Even so, it was a big improvement on June's sunshine.
No soil temperature readings were taken due to relocation of sensors. These are planned to be installed in August 2012.
The dominant wind direction was 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 58 hours, and representative of the wetter than normal nature of this month.
Sea surface temperatures gradually increased up until the 7th, then fell slightly until the 16th. The hot spell of weather during the 3rd week soon warmed the SST and the month ended up above normal.
Mean pressure was below the average for July and indicative of the overall 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 often above the average.
As with the dewpoints, the relative humidity was well-above normal.
Weather Data for Otter Valley, Devon.  July 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 8.8 18.9 13.9 60 97 79 7.3 13.2 10.3 22 3.4 81 1.0 1010 1016 1013 7.4 6.9 Sunny intervals all day
2 13.2 15.8 14.5 81 98 90 11.5 15.4 13.5 30 7.3 175 2.0 1012 1016 1014 13.8 0.0 Cloudy all day
3 14.5 15.6 15.1 96 99 98 14.0 15.4 14.7 19 4.6 109 12.6 1009 1013 1011 15.0 0.0 Rain all day
4 14.4 19.2 16.8 78 99 89 13.8 17.3 15.6 18 4.9 117 0.6 1007 1010 1008 13.5 5.8 Drizzle am, sunny pm
5 13.6 19.3 16.5 77 97 87 11.8 16.0 13.9 14 1.4 34 0.0 1008 1009 1008 11.0 4.7 Cloudy am, sunny ints pm
6 13.1 19.1 16.1 81 97 89 12.3 16.0 14.2 14 0.8 20 11.0 1005 1009 1007 12.5 0.2 Cloudy am, rain pm
7 12.7 14.6 13.7 95 98 97 11.8 13.9 12.9 31 3.4 82 50.8 999 1006 1002 12.8 0.0 Rain all day. Flooding.
8 13.0 22.9 18.0 61 98 80 11.9 16.1 14.0 14 3.4 83 0.0 1001 1010 1005 10.5 10.2 Sunny intervals all day
9 14.1 17.7 15.9 79 95 87 12.6 15.4 14.0 13 1.7 40 7.4 1010 1012 1011 13.3 0.1 Sunny ints am, cloudy pm
10 10.8 18.2 14.5 72 98 85 9.5 14.7 12.1 15 2.4 57 3.0 1010 1013 1011 10.8 1.4 Sunny intervals all day
11 10.3 20.4 15.4 55 98 77 9.1 13.8 11.5 17 2.7 66 0.4 1012 1013 1013 9.2 6.1 Sunny intervals all day
12 7.9 15.4 11.7 74 98 86 6.9 14.6 10.8 19 2.9 69 16.4 1007 1014 1010 7.6 1.7 Rain all day
13 10.6 18.0 14.3 77 98 88 9.6 15.8 12.7 21 3.4 81 2.8 1000 1007 1003 9.2 1.5 Sunny ints and showers
14 13.8 18.8 16.3 67 96 82 12.4 15.0 13.7 13 2.1 52 4.2 1001 1010 1005 14.1 1.3 Sunny ints am, cloudy pm
15 11.2 18.7 15.0 55 96 76 9.1 12.4 10.8 15 2.4 58 0.2 1010 1020 1015 10.7 4.2 Sunny intervals all day
16 12.2 18.9 15.6 70 96 83 9.8 16.4 13.1 22 4.0 97 3.0 1020 1021 1020 10.3 0.3 Sunny ints am, cloudy pm
17 15.1 22.8 19.0 72 88 80 12.8 18.0 15.4 16 2.5 59 0.0 1021 1025 1023 14.3 4.8 Sunny intervals all day
18 12.9 19.4 16.2 76 98 87 11.7 17.7 14.7 20 3.5 84 7.4 1010 1022 1016 11.8 1.3 Sunny ints and showers
19 12.9 20.0 16.5 60 94 77 10.2 13.7 12.0 18 3.4 82 0.0 1010 1014 1012 11.4 6.4 Sunny intervals all day
20 9.6 20.4 15.0 52 98 75 8.4 15.3 11.9 14 1.7 45 0.0 1014 1020 1017 9.0 4.6 Sunny intervals all day
21 7.6 21.1 14.4 61 98 80 6.2 15.2 10.7 12 1.7 40 0.0 1020 1026 1023 6.4 10.3 Sunny intervals all day
22 10.8 21.9 16.4 57 98 78 9.8 15.4 12.6 13 2.3 55 0.0 1025 1027 1026 10.3 14.8 Sunny all day
23 8.8 22.2 15.5 61 99 80 7.5 16.5 12.0 14 2.3 54 0.0 1020 1025 1022 7.7 14.8 Sunny all day
24 9.1 25.3 17.2 50 98 74 7.9 16.0 12.0 11 2.6 57 0.0 1016 1020 1018 7.7 14.9 Sunny all day
25 10.9 28.5 19.7 45 97 71 9.7 18.2 14.0 10 1.7 41 0.0 1016 1017 1016 9.4 14.9 Sunny all day
26 13.3 26.5 19.9 52 97 75 12.3 17.5 14.9 12 1.2 29 0.0 1015 1017 1016 12.1 11.9 Sunny intervals all day
27 15.0 26.2 20.6 49 95 72 10.7 16.4 13.6 17 3.4 81 0.0 1011 1015 1013 13.8 12.8 Sunny all day
28 9.2 20.8 15.0 44 97 71 7.4 12.5 10.0 15 2.9 70 0.0 1011 1012 1012 7.3 10.0 Sunny intervals all day
29 9.4 19.7 14.6 48 97 73 7.1 12.3 9.7 16 2.4 58 0.0 1011 1014 1012 7.4 9.3 Sunny intervals all day
30 7.3 20.4 13.9 43 98 71 6.0 12.1 9.1 16 2.1 51 0.0 1014 1016 1015 5.6 6.0 Sunny intervals all day
31 13.6 21.2 17.4 76 97 87 10.7 17.3 14.0 22 4.4 106 1.0 1012 1016 1014 12.9 4.5 Cloudy am, sunny pm
11.6 20.3 15.9 65 97 81 10.1 15.3 12.7 17 2.9 2129 123 1011 1016 1013 10.6 185.7  

Graphs for July 2012

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