Weather Averages for Fairfax, VA

Weather Averages for
Fairfax, VA

Latitude: 38°57'N, Longitude: 77°27'W, Elevation: 290.0 ft, Distance: 3.75 mi

	Unit	Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Average temperature over 33 years	°F	53	31	34	44	53	62	71	75	75	66	55	46	36
Average high temperature over 33 years	°F	64	41	44	55	66	75	82	87	86	78	68	57	44
Average low temperature over 33 years	°F	43	21	23	32	41	50	59	64	62	55	42	34	26
Highest recorded temperature over 33 years	°F	104	75	78	89	91	96	100	104	104	98	89	84	78
Lowest recorded temperature over 33 years	°F	-18	-18	-14	0	17	28	36	41	37	30	15	8	-4
Average number of rainy days over 30 years	days	117	10	9	10	10	12	10	11	10	9	8	9	10
Average number of days above 90°F over 33 years	days	30	-	-	-	-	1	6	12	8	3	-	-	-
Average precipitation over 33 years	in	40.3	2.8	2.7	3.4	3.0	3.9	3.6	3.6	3.8	3.5	3.2	3.4	3.3
Average dew point over 33 years	°F	43	21	21	30	39	51	60	64	64	57	44	35	26
Average number of days above 70°F over 33 years	days	171	-	1	4	11	22	29	31	31	26	13	4	1
Most recorded rainfall over 33 years	in	55.4	6.6	5.8	7.6	7.3	10.3	8.6	7.2	10.7	11.3	9.2	7.8	6.7
Least recorded rainfall over 33 years	in	28.9	0.4	0.2	1.0	0.3	0.8	0.5	0.9	0.8	0.6	-	0.2	0.4
Average number of days with thunderstorms over 33 years	days	28	-	-	1	2	4	6	6	5	2	1	1	-
Average number of days with fog over 33 years	days	170	13	10	12	10	14	16	19	20	18	14	12	12
Average morning relative humidity over 33 years	%	82	77	77	78	77	82	84	86	89	89	88	82	78
Average evening relative humidity over 33 years	%	53	57	52	49	46	53	54	54	55	55	52	54	57
Average wind speed over 33 years	mph	10.0	12.0	12.0	12.0	12.0	8.0	6.0	6.0	6.0	6.0	6.0	11.0	12.0
Average number of days below 32°F over 33 years	days	115	26	23	17	6	-	-	-	-	-	5	15	24
Average snowfall over 31 years	in	22.6	7.2	6.8	3.3	0.3	-	-	-	-	-	-	1.1	3.9
Average number of clear days over 31 years	days	91	7	8	7	7	7	6	8	8	9	11	7	7
Heating degree days over 30 years	days	5006	1066	879	676	369	140	7	-	-	44	319	588	918
Cooling degree days over 30 years	days	973	-	-	-	-	53	187	329	285	107	12	-	-
Average number of cloudy days over 31 years	days	168	17	14	16	14	14	12	12	12	12	12	15	17
Average number of partly cloudy days over 31 years	days	106	7	6	8	9	10	12	11	11	9	8	8	7
Average number of days below 10°F over 33 years	days	9	5	2	-	-	-	-	-	-	-	-	-	2

Check weather averages for nearby locations (some locations might offer more data):

Latitude: 38°47'N, Longitude: 77°30'W, Elevation: 330.0 ft, Distance: 8.31 mi

Latitude: 39°1'N, Longitude: 77°43'W, Elevation: 499.0 ft, Distance: 16.78 mi

Latitude: 38°56'N, Longitude: 77°7'W, Elevation: 146.0 ft, Distance: 17.87 mi

Latitude: 38°54'N, Longitude: 77°6'W, Elevation: 66.0 ft, Distance: 18.59 mi

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Weather Averages Fairfax, VA