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Average Temperature
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
°F	35.9	14.9	18.7	25.7	35.8	46.6	54.4	58.4	56.3	48.4	34.6	21.2	16.3
°C	2	-9	-7	-3	2	8	12	14	13	9	1	-6	-8

Years Charted: 30

Source: National Weather Service, San Francisco

Average High Temperature
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
°F	42.7	21.4	25.8	33.1	42.8	54.4	61.6	65.2	63	55.2	40.5	27.2	22.5
°C	5	-5	-3	0	6	12	16	18	17	12	4	-2	-5

Years Charted: 30

Source: National Weather Service, San Francisco

Average Low Temperature
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
°F	29.1	8.4	11.5	18.1	28.6	38.8	47.2	51.7	49.5	41.6	28.7	15.1	10
°C	-1	-13	-11	-7	-1	3	8	10	9	5	-1	-9	-12

Years Charted: 30

Source: National Weather Service, San Francisco

Highest Recorded Temperature
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
°F	85	50	48	51	65	77	85	82	82	73	61	53	48
°C	29	10	8	10	18	25	29	27	27	22	16	11	8

Years Charted: 40

Source: National Weather Service, San Francisco

Lowest Recorded Temperature
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
°F	-34	-34	-26	-24	-4	17	33	38	31	19	-5	-21	-30
°C	-36	-36	-32	-31	-20	-8	0	3	0	-7	-20	-29	-34

Years Charted: 40

Source: National Weather Service, San Francisco

Mean Number of Days Below 32°F/0°C
	Total	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
Days	191	30	27	28	21	3	0	0	0	3	20	28	30

Years Charted: 29

Source: National Weather Service, San Francisco

Average Precipitation
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
in.	15.91	0.79	0.78	0.69	0.67	0.73	1.14	1.71	2.44	2.7	2.03	1.11	1.12
mm	404	20	19	17	17	18	28	43	61	68	51	28	28

Years Charted: 30

Source: National Weather Service, San Francisco

Average Snowfall
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
in.	69.5	10.7	11.5	9	4.8	0.4	0	0	0	0.3	7.3	10.7	14.8
mm	1765	271	292	228	121	10	0	0	0	7	185	271	375

Years Charted: 50

Source: National Weather Service, San Francisco

Average Wind Speed
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
mph	7	6.4	6.8	6.9	7.2	8.4	8.3	7.3	6.9	6.7	6.7	6.5	6.2
km/h	11	10	10	11	11	13	13	11	11	10	10	10	9

Years Charted: 40

Source: National Weather Service, San Francisco

Average Days of Precipitation
	Total	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
Days	117	8	8	7	6	7	8	12	14	14	12	10	11

Years Charted: 29

Source: National Weather Service, San Francisco

Days With Sunshine
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
%	42	36	43	51	51	52	47	44	39	40	37	33	28

Years Charted: 38

Source: National Weather Service, San Francisco

Mean Number of Cloudy Days
	Total	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
Days	240	19	18	18	18	20	20	22	22	21	21	20	21

Years Charted: 40

Source: National Weather Service, San Francisco

Mean Number of Partly Cloudy Days
	Total	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
Days	64	5	4	5	6	7	7	6	6	5	5	5	4

Years Charted: 40

Source: National Weather Service, San Francisco

Mean Number of Clear Days
	Total	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
Days	61	7	6	8	6	4	3	3	3	4	5	5	6

Years Charted: 40

Source: National Weather Service, San Francisco

Average Morning Relative Humidity
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
%	73	74	73	70	66	63	67	73	78	79	78	77	77

Years Charted: 40

Source: National Weather Service, San Francisco

Average Afternoon Relative Humidity
	Year	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.
%	63	72	67	57	53	49	56	62	64	63	66	73	76

Years Charted: 40

Source: National Weather Service, San Francisco