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The climate of NW3, much like the rest of London, is a function of its proximity to the European continent, positioning close to the North Atlantic and the North Sea, and to some extent the Urban Heat Island effect and London's rather northerly latitude. The direction of the wind (or more precisely the air mass this brings) is largely responsible for which of these sources most influences the day-to-day weather. With the prevailing wind being broadly south-westerly (bringing tropical maritime air), this gives London its climate of consistent rainfall throughout the year, relatively low sunshine hour count and few snow days, as well as a lack of extremes of temperature, those generally coming when the wind switches away from this direction - to the Arctic north or Polar north-east for cold, and to the Continental south or south east for heat. Thunderstorms are not frequent, and generally comparatively weak compared to those of the near continent. Days of strong winds do occasionally occur, and along with the odd short-lived heat wave or icy cold snap, are the only real hazards in NW3, flooding not being a problem to this hilly area of London, home to inner London's highest point (Whitestone Pond, 134 m).

Long-term Climate Averages

These are estimates for the long-term average weather conditions, i.e. the climate, at NW3.
They were derived from data for the period 1971-2000 - the WMO standard referece period - from nearby official Met Office sites. (Mostly the one at Whitestone Pond (see above), which although less than a couple of miles away, is some 80 m higher up in terms of elevation.)
Some adjustments have therfore been made to reflect the different siting conditions.

  Temperature / °C Rain / mm Wind
Speed
/ mph
Days Of Days Of Snow Sun Hours Max Possible Sun Hours % of Max
  Min Max Mean Range Rainfall >1mm Days Air
 Frost
Thunder Lying Falling
January 2.4 7.0 4.7 4.6 63 11 5.2 7 0.4 2.5 5 46 233 20%
February 2.2 7.6 4.9 5.4 40 9 5.1 7 0.3 2.5 5 75 249 30%
March 3.6 10.4 7.0 6.8 51 10 5.2 3 0.6 0.4 4 105 331 32%
April 5.0 12.8 8.9 7.8 56 10 4.9 1 1 0.2 2 137 376 36%
May 8.3 16.7 12.5 8.4 59 9 4.7 0.1 2 0 0 190 440 43%
June 11.1 20.2 15.7 9.1 59 9 4.4 0 3 0 0 191 452 42%
July 13.4 22.4 17.9 9.0 47 7 4.3 0 2 0 0 185 454 41%
August 13.2 22.2 17.7 9.0 62 8 4.0 0 3 0 0 182 410 44%
September 11.1 18.7 14.9 7.6 66 9 3.9 0 2 0 0 138 342 40%
October 8.8 14.6 11.7 5.8 69 10 4.1 0.2 1 0 0 106 295 36%
November 5.0 10.2 7.6 5.2 64 10 4.6 2 0.4 0.3 1 68 237 29%
December 3.2 7.8 5.5 4.6 66 11 5.1 6 0.3 1 3 48 219 22%
                             
Winter 2.6 7.5 5.0 4.9 169 31 5.1 20 1 6 13 169 701 24%
Spring 5.6 13.3 9.5 7.7 166 29 4.9 4.1 4 0.6 6 432 1147 38%
Summer 12.6 21.6 17.1 9.0 168 24 4.3 0 8 0 0 558 1316 42%
Autumn 8.3 14.5 11.4 6.2 199 29 4.2 2.2 3 0.3 1 312 874 36%
                             
Sum         702 113   26 16 7 20 1471 4038 36%
                             
Annual 7.3 14.3 10.8 6.9 59 9 4.6 2.2 1.3 1 1.6 123 337 36%
                             
Range 11.2 15.4 13.2 4.5 29 4 1.4 7 3 2.5 5 145 235 62%

A day-by-day progression of the temperature averages can be found here.

temperature climate graph rainfall climate graph
wind speed climate graph sunshine climate graph
AF and thunder climate graph snow days climate graph