WEATHER REVIEW - November 2007

Headline: A fairly typical November, although with some notable squalls and short-lived snow.

The month began with high pressure over mainland Europe dominating the southern half of the UK. Over the next few days the high became centred on the UK and whilst a weather front worked southwards it brought little more than cloud. Little wind and clear skies overnight into the 4th resulted in fairly extensive fog across the county. Temperatures generally fell during the first week, particularly overnight lows.  The high began to retreat southwards on the 5th in the face of an approaching frontal system from the north-west. This saw a significant increase in the wind and a notable squall at Pitsford as it worked through at around 16:30.

Over the next week or so high pressure would remain fairly stationary close to the British Isles with a centre to the south-west. Low pressure systems and associated fronts tended to work round this introducing rain at times and a fairly blustery north-westerly wind. A particularly deep low tracked past the north of the UK on the 8th and its impact was felt across the county as another notable squall just after 14:00. Heavy showers with hail were accompanied by a sudden drop in temperature by some 6C. Strong winds were also experienced with gusts reaching 46mph.

The low pressure system of the 8th having tracked across the North Sea remained over southern Scandinavia over the next few days as it filled maintaining a cold northerly airstream across the UK. An air frost was recorded overnight into the 12th  at Pitsford (-1.0C) and daytime temperatures also fell significantly (7.1C on the 12th).  Further frontal systems brought spells on rain on the 12th and 13th.

By the 14th the area of high pressure to the south-west began to extend its influence across the UK and the weather over the next few days became more settled with lighter winds. There were some sunny spells during the daytime, although the pay-off was some chilly nights with further air frosts on the 15th, 16th and 17th.  As the high began to slip southwards on the 17th the UK became exposed to a fairly deep low developing over Iceland. This firstly introduced a cold front southwards on the 17th, but on the 18th the low itself had extended further south resulting in a particularly wet day across the county with just under 25mm of rain recorded at Pitsford. With temperatures having struggled to reach 6C during the day, the drop in temperature during the evening turned much of the remaining rain to snow with a fairly heavy accumulation. Fortunately, temperatures later in the night rose melting much of the snow before the following morning and averting potential traffic chaos across the county.

Over the next few days the weather would remain cyclonic across the UK as a blocking high over eastern Europe and Scandinavia held back the normal eastward track of Atlantic weather systems. The 19th was again wet (13.5mm) and the 20th also, although with the wind having swung round to the south or south-east it remained mild overnight. An attempt was made by high pressure to the south-west to extend a ridge across the south of the UK on the 23rd. This shielded the county from some particularly wet and windy weather which affected many northern and western parts of Britain the following day and which was associated with another fairly deep Icelandic low. However, the day did start with a fairly hard frost. Over the next few days the high broadened its influence across much of the country, introducing some milder air and one or two showers.

As November came to a close this high disappeared from the UK  as cyclonic conditions developed across much of northern Europe. By the 30th high pressure had pretty much disappeared from the map of Europe and the county was left with a strong but mild southerly airflow introducing further spells of rain. 

Air Temperatures    
The Highest Maximum:   15.5C on 1st & 2nd
The Lowest Maximum:   6.1C on 23rd
The Highest Minimum:   9.4C on 11th
The Lowest Minimum:   -2.6C on 24th
The Mean Maximum:   10.4C  
The Mean Minimum:   3.6C  
The Overall Mean:   7.0C  
Difference from the Monthly Mean: +0.1C  
    
Black Bulb (Globe)    
Maximum (at 0900):   16.2C on 1st
Mean (at 0900):    7.1C  
    
Relative Humidity:    
Highest Relative Humidity (at 0900): 100.0% on 19th, 20th, 22nd & 27th
Lowest Relative Humidity (at 0900): 74.8% on 7th
Mean Relative Humidity (at 0900): 90.5%  
    
Dew Point:    
The Highest Dew Point (0900):  10.9C on 1st
The Lowest Dew Point (at 0900): -1.8C on 24th
The Mean Dew Point (at 0900):  5.1C  
    
Rainfall:    
Total:     55.6mm  
Difference from the Monthly Mean: 104.3%  
Duration:    40.1hrs  
Highest 24 hour fall (0900 to 0900): 24.7mm on 18th
Rain Days (>/=0.2mm):   12   
Wet Days (>/=1.0mm):   8   
    
Sunshine:    
Total Duration of Bright Sunshine: 63.7hrs  
Sunniest day:    6.1hrs on 6th
No. of days without sunshine:  7   
Difference from the Monthly Mean: 110.8%  
Cloud cover (mean at 0900):  5.5oktas (68.8 %)
    
Pressure (reduced to sea level at 0900):    
The Highest Pressure:   1034.4mb on 2nd
The Lowest Pressure:   998.2mb on 21st
Mean Pressure (recorded at 0900): 1020.2mb  
    
Winds    
Run of wind (mean over 24 hrs): 119.9miles  
Mean daily wind speed:   6.5mph  
Run of wind (cumulative):  3597.2miles  
Highest Maximum Gust:   46mph on 8th
No. of gusts of 50mph or more:  0   
Highest wind strength (at 0900): 19.6mph on 10th
Mean wind strength (at 0900):  6.9mph  
    
Winds from the Following Directions:    

N 4 NE 0 E 0 SE 2 S 4 SW 5 W 5 NW 8 Calm 2   
    
Concrete     
Lowest Concrete Minimum:  -4.8C on 24th
Mean Concrete Minimum:  1.4C  
    
Evaporation    
Piché     35.4ml  
Pan     10.12mm 
   
Days with:    
Thunder:    0   
Hail <5mm:    1   
Hail >/=5mm:    0   
Snow or snow & rain:   1   
Fog:     3   
Air Frost:    5
Duration of Air Frost:	  17.5hrs   
Gales:     0


All data © Pitsford Hall weather station.
Click here to view the full climatological register for November 2007.

Click here to view the weather diary for November 2007. 

Click here to view the full AWS weather record for November 2007.
Click here to view the statistical summary for 2007.

The weather station publishes a full Monthly Weather Report (ISSN 1741-4733) which is distributed to libraries across Northamptonshire. This report comprises a full UK weather diary, reports of extreme weather events across the county, statistics from Pitsford Hall's affiliated stations across the county as well as news from the weather station itself. Individuals may download this report for £2 or take out an annual subscription for the paper-based report for £25. Click here for further details.