w e a t h e r   r e v i e w    f o r   2 0 1 8


Much warmer than the average and with a notable dry spell in June followed by a heatwave in July.  Like much of the UK, rainfall was below average.
 

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January

Headline:  A milder month than December with relatively few air frosts and a predominance of west or south-westerly winds.

February

Headline:  A cold, but generally changeable pattern of weather for the first half of the month, then turning briefly milder before the onset of exceptionally cold air and snow showers imported from Siberia – ‘the Beast from the East’.

March

Headline:  A cool and unsettled start to Spring. Two very cold episodes accompanied by cold winds and snow.

April

Headline:  A brief spell of unseasonal warmth during the third week resulting in the warmest April day on record in Northampton. Otherwise, unsettled with some grey and misty days early in the month.

May

Headline:  Warm spells at both ends of the month, but with conditions more changeable in between.

June

Headline:  Dry with prolonged spells of strong sunshine. Driest June in Northampton since 1925. Only 0.2mm recorded throughout the whole of the month.

July

Headline:  Continuing dry, sunny and very warm and with much of the country under the influence of the Azores high for much of the month.

August

Headline:  Continuing hot during the first week then becoming cooler. Rainfall returning to near normal following a prolonged dry spell.

September

Headline:  A fine start, but turning gradually more unsettled later on the month. Breezy at times linked to the first storms of the Autumn season passing to the north-west, but rainfall amounts relatively low.

October

Headline:  Generally rather changeable. Becoming very warm towards the end of the second week and ending cold with an Arctic blast. Some good sunny days.

November

Headline:  Very autumnal with some cool, grey and damp days.  Blocking systems from mid-month onwards introduced spells of anticyclonic gloom.

December

Headline:  Apart from a few cold days towards the end of the second week, December remained relatively mild. Rain falling on most days, but a dry end to the month.

Statistical Summary for 2018
Air Temperatures: 
The Highest Maximum: 32.9 C on 26/07/18 at 15:33:00
The Lowest Maximum: -1.8 C on 01/03/18 at 22:15:00
The Highest Minimum: 18.3 C on 26/07/18 at 05:55:00
The Lowest Minimum: -7.2 C on 28/02/18 at 20:02:00
The Mean Maximum: 15.1 C 
The Mean Minimum: 7 C 
The Overall Mean: 11.0 C 
Difference from the Yearly Mean: +0.6 C 

Relative Humidity: 
Mean Relative Humidity: 81.9 % 

Dew Point: 
The Highest Dew Point: 28.7 C on 06/08/18 at 18:28:00
The Lowest Dew Point: -25.3 C on 05/04/18 at 13:27:00
The Mean Dew Point: -2.6 C 

Rainfall: 
Total: 527.7 mm 
Percentage of the Yearly Mean: 80.1 % 
Duration of Rainfall: 34.8 hrs 
Highest 24 hour fall (0900 to 0900): 17 mm on 30/03/18 
Rain Days (>/=0.2mm): 164 
Wet Days (>/=1.0mm): 137 

Sunshine: 
Total Duration of Bright Sunshine: 1564.7 hrs 
Sunniest day: 17.7 hrs on 03/07/18 
No. of days without sunshine: 86 
Percentage of the Yearly Mean: 112.4 % 

The Highest Solar Radiation 1176 W/m2 on 12/06/18 at 12:50:00
The Highest UV Index 6.5 on 19/06/18 at 12:30:00

Pressure (reduced to sea level): 
The Highest Pressure: 1038.7 mb on 22/10/18 at 13:02:00
The Lowest Pressure: 988.5 mb on 14/03/18 at 08:20:00
Mean Pressure: 1016.2 mb 

Winds 
Run of wind (mean over 24 hrs): 91.2 miles 
The Highest Average Wind Speed: 34.5 mph on 17/01/18 at 05:32:00
Run of wind (cumulative): 33114 miles 
Highest Maximum Gust: 62 mph on 17/01/18 at 03:57:00
Bearing of Maximum Gust: 249 
No. of gusts of 50mph or more: 2 
The Average Daily Wind Speed: 3.8 mph 

Winds from the Following Directions: 
N 64 
NE 36 
E 14 
SE 30 
S 75 
SW 40 
W 53 
NW 51 
Calm 0 


Grass 
Lowest Grass Minimum: -10 C on 28/02/18 at 19:40:00
Mean Grass Temperature: 11.2 C 

Concrete 
Lowest Concrete Minimum: -4.4 C on 27/02/18 at 20:40:00
Mean Concrete Temperature: 12.8 C 

Evaporatranspiration: 627.98 mm 

Days with: 
Thunder: 5 
Hail <5mm: 5 
Hail >/=5mm: 0 
Snow or snow & rain: 14 
Snow lying: 10 
Fog: 11 
Air Frost: 32 
Duration of Air Frost: 269.8 hrs 
Ground Frost: 58 
Gales: 0