Weather Averages for Charlestown, MA

Weather Averages for
Charlestown, MA

Latitude: 42°22'N, Longitude: 71°2'W, Elevation: 6.1 m, Distance: 1.10 km

	Unit	Year	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Average temperature over 50 years	°C	11	-1	0	3	9	15	20	23	22	18	12	7	1
Average high temperature over 50 years	°C	15	2	3	7	13	19	25	27	26	22	17	11	5
Average low temperature over 50 years	°C	6	-5	-5	0	4	10	15	18	17	13	8	3	-2
Highest recorded temperature over 50 years	°C	38	22	21	29	34	35	37	38	38	37	32	28	22
Lowest recorded temperature over 50 years	°C	-24	-24	-20	-17	-8	1	7	10	8	2	-2	-9	-21
Average number of rainy days over 42 years	days	126	11	11	12	11	11	11	9	10	9	9	11	12
Average number of days above 27°C over 50 years	days	13	-	-	-	-	-	3	6	3	1	-	-	-
Average precipitation over 50 years	cm	109.0	9.7	8.9	10.2	9.4	8.6	7.6	7.1	9.1	8.4	8.4	11.2	10.7
Average dew point over 51 years	°C	3	-8	-7	-3	1	7	12	16	15	12	6	1	-5
Most recorded rainfall over 50 years	cm	158.2	26.7	19.8	27.9	24.1	34.0	33.5	20.6	43.4	21.1	22.1	22.6	24.6
Least recorded rainfall over 50 years	cm	60.2	1.5	1.8	1.5	3.0	1.3	1.3	1.3	2.0	0.8	0.8	1.5	2.0
Average number of days with thunderstorms over 50 years	days	16	-	-	1	1	2	3	4	3	1	1	-	-
Average number of days with fog over 50 years	days	135	10	9	11	11	13	12	12	13	11	12	11	10
Average morning relative humidity over 51 years	%	72	68	68	69	68	71	72	73	76	78	77	74	70
Average evening relative humidity over 51 years	%	58	58	56	57	56	58	58	57	60	61	59	61	60
Average wind speed over 51 years	km/h	20.9	25.7	25.7	25.7	22.5	20.9	19.3	17.7	17.7	19.3	19.3	22.5	22.5
Average number of days below -1.5°C over 50 years	days	97	26	23	17	2	-	-	-	-	-	-	7	22
Average snowfall over 58 years	cm	103.9	30.5	28.7	20.1	2.3	-	-	-	-	-	-	3.3	19.1
Average number of days above 14.5°C over 50 years	days	153	-	-	1	6	17	27	31	31	24	13	3	-
Average number of clear days over 58 years	days	98	9	8	8	7	6	7	7	9	10	11	8	9
Heating degree days over 30 years	days	5641	1128	972	818	507	221	32	-	6	72	321	591	973
Cooling degree days over 30 years	days	678	-	-	-	-	10	113	264	220	66	5	-	-
Average possibility of sunshine over 58 years	%	58	53	56	57	56	59	63	66	65	63	60	50	52
Average number of cloudy days over 58 years	days	163	15	13	15	15	15	13	12	11	12	12	15	15
Average number of partly cloudy days over 58 years	days	104	7	7	8	8	10	10	12	11	8	8	7	7

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

Latitude: 42°24'N, Longitude: 71°6'W, Elevation: 9.1 m, Distance: 1.46 km

Latitude: 42°31'N, Longitude: 71°8'W, Elevation: 27.4 m, Distance: 6.30 km

Latitude: 42°13'N, Longitude: 71°7'W, Elevation: 191.1 m, Distance: 7.17 km

Latitude: 42°14'N, Longitude: 70°55'W, Elevation: 9.1 m, Distance: 7.81 km

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Weather Averages Charlestown, MA