Weather Averages for Portsmouth, NH

Weather Averages for
Portsmouth, NH

Latitude: 43°5'N, Longitude: 70°49'W, Elevation: 101.0 ft, Distance: 1.25 mi

	Unit	Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Average temperature over 33 years	°F	48	24	26	35	45	56	65	70	69	61	51	41	29
Average high temperature over 33 years	°F	56	31	33	42	53	64	74	79	77	70	59	48	36
Average low temperature over 33 years	°F	39	16	17	27	36	46	55	61	60	52	42	33	21
Highest recorded temperature over 33 years	°F	100	60	66	78	91	98	95	100	100	93	87	75	68
Lowest recorded temperature over 33 years	°F	-16	-16	-9	-	17	28	37	46	39	32	23	10	-9
Average precipitation over 33 years	in	43.8	3.7	3.4	3.6	3.8	3.6	3.3	3.3	2.7	3.4	3.7	5.0	4.2
Average dew point over 10 years	°F	36	11	15	21	33	44	53	60	59	51	39	31	19
Average number of days with thunderstorms over 33 years	days	162	11	10	12	13	14	15	16	16	15	14	14	12
Average morning relative humidity over 10 years	%	72.6	61.6	64	64.4	69.5	74.5	76.5	79.7	82.2	80.8	77.2	72.6	68
Average evening relative humidity over 10 years	%	55.9	51.5	50.6	51	55.1	57.1	57.3	58	61	58.5	56.5	58.8	55.6
Average wind speed over 12 years	mph	11.0	7.0	7.0	7.0	5.0	5.0	4.0	4.0	5.0	5.0	6.0	7.0	6.0
Average number of days with snow over 33 years	days	30	7	6	6	1	-	-	-	-	-	1	2	7
Average snowfall over 33 years	in	66.5	17.6	15.9	11.5	2.5	-	-	-	-	-	0.1	3.1	15.3
Most rain reported in a day over 33 years	in	6.7	2.9	4.1	2.5	4.6	3.8	3.2	2.6	4.1	4.0	6.7	4.1	3.1
Most rain reported in a month over 33 years	in	67.0	12.3	9.4	10.2	11.1	9.3	8.8	7.8	7.2	8.1	12.1	13.7	10.1
Least rain reported in a month over 33 years	in	27.7	0.4	-	1.0	1.1	1.0	0.8	0.6	1.1	0.2	1.0	0.8	0.6
Heating degree days over 33 years	days	6596	1254	1084	918	579	288	76	9	23	147	425	698	1095
Cooling degree days over 33 years	days	520	-	-	-	1	19	90	199	159	50	2	-	-
Average number of days below 10°F over 33 years	days	4	2	1	-	-	-	-	-	-	-	-	-	1
Average number of days above 80°F over 12 years	days	33	-	-	1	3	9	16	13	4	1	-	-	47
Most snow reported in a month over 33 years	in	118.2	43.5	61.2	30.4	24.4	-	-	-	-	-	2.0	12.8	38.4
Average possibility of clouds over 12 years	%	33	-	1	1	2	4	6	4	2	1	1	-	23
Average number of days below 33°F over 33 years	days	130	29	26	23	8	-	-	-	-	-	3	14	27
Most snow reported in a day over 33 years	in	101.1	20.4	13.3	18.3	-	-	-	-	-	2.0	9.9	16.8	20.4
Deepest snow cover reported over 33 years	in	39.0	30.0	39.0	38.0	21.0	-	-	-	-	-	2.0	8.0	26.0
Average wet bulb point over 10 years	°F	43	21	24	30	40	50	57	64	62	55	45	37	27

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

Latitude: 43°2'N, Longitude: 70°51'W, Elevation: 30.0 ft, Distance: 3.52 mi

Latitude: 43°1'N, Longitude: 70°49'W, Elevation: 128.0 ft, Distance: 3.74 mi

Latitude: 43°9'N, Longitude: 70°57'W, Elevation: 74.0 ft, Distance: 9.36 mi

Latitude: 43°2'N, Longitude: 71°5'W, Elevation: 160.0 ft, Distance: 14.48 mi

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Weather Averages Portsmouth, NH