Long-term Averages

These are estimates for the long-term average weather conditions at NW3.
They were derived from data for the period 1971-2000 from nearby official Met Office sites. Some adjustments have been made to reflect the different siting conditions.


	Temperature / °C				Rain / mm		Wind Speed / mh^-1	Days Of		Days Of Snow		Sun Hours	Max Possible Sun Hours	% of Max
	Min	Max	Mean	Range	Rainfall	>1mm Days	Wind Speed / mh^-1	Air Frost	Thunder	Lying	Falling	Sun Hours	Max Possible Sun Hours	% of Max
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.

NW3 Weather

Long-term Averages