Summer weather

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

Temperatures

Maximum Temperatures

Period	London	San Francisco
Jun 1	67.6°F	68.2°F
Jun 8	69.6°F	69.3°F
Jun 15	72.3°F	70.5°F
Jun 22	72.7°F	69.6°F
Jul 1	71.6°F	70.0°F
Jul 8	73.0°F	71.6°F
Jul 15	76.1°F	70.7°F
Jul 22	74.3°F	70.9°F
Aug 1	75.0°F	71.2°F
Aug 8	76.1°F	72.0°F
Aug 15	72.7°F	72.9°F
Aug 22	72.0°F	72.9°F
Average	72.8°F	70.8°F

Minimum Temperatures

Period	London	San Francisco
Jun 1	52.2°F	53.6°F
Jun 8	54.1°F	55.2°F
Jun 15	55.9°F	55.4°F
Jun 22	57.0°F	55.6°F
Jul 1	56.7°F	55.4°F
Jul 8	58.5°F	56.1°F
Jul 15	60.3°F	55.9°F
Jul 22	60.8°F	56.5°F
Aug 1	60.1°F	57.2°F
Aug 8	61.2°F	58.1°F
Aug 15	60.3°F	58.6°F
Aug 22	58.3°F	58.1°F
Average	58.0°F	56.3°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
Jun 1	5.3 hours/day	12.4 hours/day
Jun 8	6.1 hours/day	11.2 hours/day
Jun 15	5.4 hours/day	13.9 hours/day
Jun 22	6.1 hours/day	11.7 hours/day
Jul 1	5.0 hours/day	12.3 hours/day
Jul 8	3.5 hours/day	12.9 hours/day
Jul 15	5.0 hours/day	12.3 hours/day
Jul 22	3.6 hours/day	11.8 hours/day
Aug 1	4.8 hours/day	11.1 hours/day
Aug 8	5.3 hours/day	11.5 hours/day
Aug 15	4.2 hours/day	10.9 hours/day
Aug 22	4.7 hours/day	11.5 hours/day
Average	4.9 hours/day	12.0 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
Jun 1	0.1in	0.0in
Jun 8	0.1in	0.0in
Jun 15	0.2in	0.0in
Jun 22	0.1in	0.0in
Jul 1	0.1in	0.0in
Jul 8	0.1in	0.0in
Jul 15	0.1in	0.0in
Jul 22	0.1in	0.0in
Aug 1	0.1in	0.0in
Aug 8	0.1in	0.0in
Aug 15	0.1in	0.0in
Aug 22	0.1in	0.0in
Average	0.1in	0.0in

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

Wind Speed

Period	London	San Francisco
Jun 1	11.4mph	12.3mph
Jun 8	11.6mph	12.5mph
Jun 15	10.8mph	12.3mph
Jun 22	11.1mph	11.6mph
Jul 1	11.6mph	11.4mph
Jul 8	9.9mph	10.7mph
Jul 15	10.5mph	10.9mph
Jul 22	11.8mph	10.4mph
Aug 1	10.6mph	10.6mph
Aug 8	11.4mph	10.8mph
Aug 15	11.5mph	10.6mph
Aug 22	10.5mph	10.1mph
Average	11.1mph	11.2mph

Humidity

Period	London	San Francisco
Jun 1	68.3%	73.6%
Jun 8	66.9%	71.3%
Jun 15	66.6%	71.3%
Jun 22	65.4%	74.5%
Jul 1	65.1%	75.0%
Jul 8	65.8%	75.1%
Jul 15	60.8%	76.6%
Jul 22	64.4%	75.1%
Aug 1	61.0%	76.5%
Aug 8	62.1%	75.6%
Aug 15	64.4%	75.6%
Aug 22	62.8%	74.6%
Average	64.5%	74.6%

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Astronomy

Sunrise Time

Period	London	San Francisco
Jun 1	4:47	5:49
Jun 8	4:43	5:47
Jun 15	4:43	5:48
Jun 22	4:44	5:50
Jul 1	4:50	5:53
Jul 8	4:56	5:58
Jul 15	5:05	6:02
Jul 22	5:16	6:09
Aug 1	5:29	6:16
Aug 8	5:40	6:22
Aug 15	5:51	6:28
Aug 22	6:04	6:35
Average	5:12	6:06

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

Sunset Time

Period	London	San Francisco
Jun 1	21:11	20:28
Jun 8	21:17	20:32
Jun 15	21:21	20:34
Jun 22	21:22	20:35
Jul 1	21:20	20:35
Jul 8	21:15	20:32
Jul 15	21:08	20:29
Jul 22	20:57	20:23
Aug 1	20:43	20:14
Aug 8	20:31	20:07
Aug 15	20:16	19:58
Aug 22	19:59	19:47
Average	20:54	20:24

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

Useful Day Length

Period	London	San Francisco
Jun 1	14:11 hours	13:28 hours
Jun 8	14:17 hours	13:32 hours
Jun 15	14:21 hours	13:34 hours
Jun 22	14:22 hours	13:35 hours
Jul 1	14:20 hours	13:35 hours
Jul 8	14:15 hours	13:32 hours
Jul 15	14:08 hours	13:29 hours
Jul 22	13:57 hours	13:23 hours
Aug 1	13:43 hours	13:14 hours
Aug 8	13:31 hours	13:07 hours
Aug 15	13:16 hours	12:58 hours
Aug 22	12:59 hours	12:47 hours
Average	13:54 hours	13:24 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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Summer weather

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