Spring weather

Calculations are based on the last 8 years of historical weather data.

Temperatures

Maximum Temperatures

Period	London	San Francisco
Mar 1	48.7°F	56.5°F
Mar 8	52.3°F	59.0°F
Mar 15	53.4°F	58.5°F
Mar 22	54.9°F	59.9°F
Apr 1	54.9°F	61.0°F
Apr 8	57.2°F	61.7°F
Apr 15	59.4°F	62.2°F
Apr 22	57.2°F	65.1°F
May 1	60.3°F	65.3°F
May 8	62.8°F	65.5°F
May 15	64.9°F	64.6°F
May 22	67.3°F	66.0°F
Average	57.8°F	62.1°F

Minimum Temperatures

Period	London	San Francisco
Mar 1	39.0°F	46.8°F
Mar 8	41.7°F	48.2°F
Mar 15	42.3°F	47.8°F
Mar 22	42.4°F	48.6°F
Apr 1	41.9°F	49.3°F
Apr 8	43.0°F	49.1°F
Apr 15	44.1°F	49.8°F
Apr 22	43.7°F	51.4°F
May 1	46.0°F	51.3°F
May 8	48.0°F	51.8°F
May 15	49.5°F	52.2°F
May 22	51.4°F	52.5°F
Average	44.4°F	49.9°F

Maximum/minimum temperature averages are computed by averaging the max/min temperature of each day for a given period.

Conditions

Sunny Weather

Period	London	San Francisco
Mar 1	2.5 hours/day	4.5 hours/day
Mar 8	1.5 hours/day	5.7 hours/day
Mar 15	2.4 hours/day	5.2 hours/day
Mar 22	4.3 hours/day	6.4 hours/day
Apr 1	4.2 hours/day	6.1 hours/day
Apr 8	3.3 hours/day	9.1 hours/day
Apr 15	5.1 hours/day	8.3 hours/day
Apr 22	3.7 hours/day	9.3 hours/day
May 1	3.2 hours/day	10.3 hours/day
May 8	4.7 hours/day	10.8 hours/day
May 15	4.4 hours/day	10.1 hours/day
May 22	5.6 hours/day	10.8 hours/day
Average	3.7 hours/day	8.0 hours/day

Sun hours are computed from the number of hours of direct sunlight. The length of the day can affect these measurements; for example, northern cities have longer days in summer.

Precipitation Levels

Period	London	San Francisco
Mar 1	0.1in	0.1in
Mar 8	0.1in	0.2in
Mar 15	0.0in	0.1in
Mar 22	0.1in	0.1in
Apr 1	0.1in	0.1in
Apr 8	0.1in	0.0in
Apr 15	0.0in	0.0in
Apr 22	0.1in	0.0in
May 1	0.1in	0.0in
May 8	0.1in	0.0in
May 15	0.1in	0.0in
May 22	0.1in	0.0in
Average	0.1in	0.1in

Average amount of precipitation that falls in a form of a rain, snow, sleet or hail.

Wind Speed

Period	London	San Francisco
Mar 1	12.1mph	12.9mph
Mar 8	14.9mph	12.0mph
Mar 15	12.8mph	10.9mph
Mar 22	12.1mph	12.6mph
Apr 1	12.5mph	12.3mph
Apr 8	11.1mph	12.6mph
Apr 15	11.1mph	11.4mph
Apr 22	11.6mph	12.2mph
May 1	10.5mph	12.3mph
May 8	11.4mph	12.3mph
May 15	10.2mph	13.3mph
May 22	11.3mph	12.1mph
Average	11.8mph	12.2mph

Humidity

Period	London	San Francisco
Mar 1	74.7%	73.1%
Mar 8	74.5%	75.2%
Mar 15	74.9%	74.9%
Mar 22	70.9%	73.4%
Apr 1	69.5%	72.3%
Apr 8	70.0%	72.1%
Apr 15	66.9%	73.2%
Apr 22	69.5%	72.4%
May 1	70.1%	71.8%
May 8	69.3%	72.7%
May 15	70.5%	74.7%
May 22	69.0%	74.7%
Average	70.8%	73.4%

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Astronomy

Sunrise Time

Period	London	San Francisco
Mar 1	6:39	6:37
Mar 8	6:23	6:52
Mar 15	6:08	7:16
Mar 22	6:05	7:03
Apr 1	6:29	6:50
Apr 8	6:13	6:40
Apr 15	5:58	6:30
Apr 22	5:42	6:19
May 1	5:27	6:10
May 8	5:15	6:03
May 15	5:04	5:58
May 22	4:54	5:52
Average	5:54	6:30

Sunrise times are output in the local timezone of each place.

Sunset Time

Period	London	San Francisco
Mar 1	17:46	18:07
Mar 8	17:58	18:39
Mar 15	18:10	19:20
Mar 22	18:42	19:28
Apr 1	19:39	19:36
Apr 8	19:51	19:42
Apr 15	20:02	19:49
Apr 22	20:16	19:56
May 1	20:29	20:03
May 8	20:40	20:10
May 15	20:50	20:16
May 22	21:02	20:22
Average	19:36	19:36

Sunset times are output in the local timezone of each place.

Useful Day Length

Period	London	San Francisco
Mar 1	10:46 hours	11:07 hours
Mar 8	10:58 hours	11:39 hours
Mar 15	11:10 hours	12:04 hours
Mar 22	11:42 hours	12:25 hours
Apr 1	12:39 hours	12:36 hours
Apr 8	12:51 hours	12:42 hours
Apr 15	13:02 hours	12:49 hours
Apr 22	13:16 hours	12:56 hours
May 1	13:29 hours	13:03 hours
May 8	13:40 hours	13:10 hours
May 15	13:50 hours	13:16 hours
May 22	14:02 hours	13:22 hours
Average	12:36 hours	12:36 hours

Discards daylight hours before 7 AM. In places that are located to the west of the timezone, the sun rises and sets later compared to the cities that are located to the east. This means that the useful day length is longer in the cities located to the west of the time zone.

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Spring weather

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