Weather Averages for Seatac, WA

Weather Averages for
Seatac, WA

Latitude: 47°27'N, Longitude: 122°18'W, Elevation: 137.2 m, Distance: 0.67 km

	Unit	Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Average temperature over 48 years	°C	11	4	6	7	9	13	16	18	18	16	11	7	5
Average high temperature over 48 years	°C	15	7	9	11	13	17	21	23	23	20	15	10	7
Average low temperature over 48 years	°C	6	1	2	3	5	7	10	12	12	10	7	3	2
Highest recorded temperature over 48 years	°C	37	17	21	23	29	33	35	37	37	36	31	23	17
Lowest recorded temperature over 48 years	°C	-	-	-17	-11	-1	-2	3	6	6	1	-2	-14	-14
Average number of rainy days over 49 years	days	154	18	16	17	14	10	9	5	6	9	13	18	19
Average number of days above 27°C over 48 years	days	3	-	-	-	-	-	-	1	1	-	-	-	-
Average precipitation over 48 years	cm	96.5	14.2	10.4	9.4	6.3	4.3	3.8	2.0	2.8	4.6	8.6	15.0	14.7
Average dew point over 48 years	°C	6	0	1	2	3	6	8	11	11	10	7	3	1
Most recorded rainfall over 48 years	cm	140.0	32.8	23.1	21.3	16.5	12.2	9.7	6.1	11.7	15.0	19.8	27.2	30.0
Least recorded rainfall over 48 years	cm	60.2	1.5	0.8	1.5	0.8	0.3	0.3	-	-	-	0.8	1.8	3.6
Average number of days with thunderstorms over 48 years	days	8	-	-	1	1	1	1	1	1	1	-	1	-
Average number of days with fog over 48 years	days	164	18	15	13	10	8	8	8	11	16	19	19	19
Average morning relative humidity over 48 years	%	83	83	83	84	83	80	79	79	83	88	88	86	85
Average evening relative humidity over 48 years	%	62	75	69	63	57	54	53	49	51	56	68	76	79
Average wind speed over 48 years	km/h	16.1	17.7	16.1	19.3	17.7	16.1	14.5	14.5	14.5	14.5	16.1	17.7	17.7
Average number of days below -1.5°C over 48 years	days	36	11	7	4	1	-	-	-	-	-	-	4	9
Average snowfall over 49 years	cm	30.0	12.7	4.1	3.6	0.3	-	-	-	-	-	-	3.0	6.3
Average number of days above 14.5°C over 48 years	days	127	-	-	1	5	13	21	29	29	22	6	-	-
Average number of clear days over 49 years	days	58	3	3	3	3	4	5	10	9	8	4	3	2
Heating degree days over 30 years	days	4908	772	602	601	474	307	144	58	65	156	378	591	760
Cooling degree days over 30 years	days	190	-	-	-	-	-	21	64	81	24	-	-	-
Average possibility of sunshine over 27 years	%	47	26	39	49	52	55	56	64	65	61	43	28	22
Average number of cloudy days over 49 years	days	226	24	21	22	20	18	17	11	12	13	20	23	25
Average number of partly cloudy days over 49 years	days	81	4	4	6	7	9	8	10	10	9	7	4	4

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

Latitude: 47°26'N, Longitude: 122°18'W, Elevation: 115.8 m, Distance: 0.91 km

Latitude: 47°32'N, Longitude: 122°18'W, Elevation: 9.1 m, Distance: 3.73 km

Latitude: 47°23'N, Longitude: 122°14'W, Elevation: 9.1 m, Distance: 3.79 km

Latitude: 47°30'N, Longitude: 122°30'W, Elevation: 70.1 m, Distance: 5.61 km

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Weather Averages Seatac, WA