Autumn weather

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

Temperatures

Maximum Temperatures

Period	London	San Francisco
Sep 1	71.1°F	74.8°F
Sep 8	69.6°F	72.7°F
Sep 15	69.3°F	69.8°F
Sep 22	64.6°F	71.6°F
Oct 1	62.4°F	72.5°F
Oct 8	62.2°F	69.1°F
Oct 15	60.4°F	70.5°F
Oct 22	58.5°F	68.4°F
Nov 1	55.4°F	66.2°F
Nov 8	54.1°F	62.2°F
Nov 15	50.9°F	62.6°F
Nov 22	49.1°F	60.8°F
Average	60.6°F	68.4°F

Minimum Temperatures

Period	London	San Francisco
Sep 1	57.7°F	59.5°F
Sep 8	56.8°F	58.1°F
Sep 15	55.6°F	57.4°F
Sep 22	53.2°F	57.4°F
Oct 1	52.2°F	57.7°F
Oct 8	51.4°F	55.6°F
Oct 15	51.6°F	56.3°F
Oct 22	49.3°F	55.2°F
Nov 1	45.7°F	53.4°F
Nov 8	46.6°F	50.7°F
Nov 15	43.2°F	50.9°F
Nov 22	41.7°F	49.6°F
Average	50.4°F	55.2°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
Sep 1	4.0 hours/day	11.2 hours/day
Sep 8	4.1 hours/day	11.4 hours/day
Sep 15	5.4 hours/day	8.6 hours/day
Sep 22	3.3 hours/day	9.0 hours/day
Oct 1	2.3 hours/day	8.1 hours/day
Oct 8	2.9 hours/day	7.9 hours/day
Oct 15	2.4 hours/day	7.9 hours/day
Oct 22	2.2 hours/day	8.0 hours/day
Nov 1	2.8 hours/day	7.7 hours/day
Nov 8	1.9 hours/day	6.1 hours/day
Nov 15	2.1 hours/day	6.1 hours/day
Nov 22	2.3 hours/day	5.8 hours/day
Average	3.0 hours/day	8.2 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
Sep 1	0.1in	0.0in
Sep 8	0.1in	0.0in
Sep 15	0.1in	0.0in
Sep 22	0.1in	0.0in
Oct 1	0.2in	0.0in
Oct 8	0.1in	0.0in
Oct 15	0.2in	0.0in
Oct 22	0.1in	0.0in
Nov 1	0.1in	0.0in
Nov 8	0.1in	0.0in
Nov 15	0.1in	0.1in
Nov 22	0.1in	0.1in
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
Sep 1	9.8mph	9.5mph
Sep 8	10.4mph	10.2mph
Sep 15	10.6mph	11.3mph
Sep 22	11.8mph	9.6mph
Oct 1	13.1mph	8.8mph
Oct 8	11.3mph	9.4mph
Oct 15	12.4mph	9.1mph
Oct 22	12.6mph	9.1mph
Nov 1	12.1mph	8.7mph
Nov 8	12.2mph	8.4mph
Nov 15	11.7mph	8.3mph
Nov 22	12.3mph	8.9mph
Average	11.7mph	9.3mph

Humidity

Period	London	San Francisco
Sep 1	64.2%	70.8%
Sep 8	65.9%	73.6%
Sep 15	64.7%	76.3%
Sep 22	68.3%	71.0%
Oct 1	72.9%	65.9%
Oct 8	71.8%	67.2%
Oct 15	74.6%	65.8%
Oct 22	75.5%	64.7%
Nov 1	75.8%	65.4%
Nov 8	77.6%	67.5%
Nov 15	76.9%	63.6%
Nov 22	78.6%	65.9%
Average	72.2%	68.1%

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Astronomy

Sunrise Time

Period	London	San Francisco
Sep 1	6:17	6:43
Sep 8	6:29	6:49
Sep 15	6:40	6:54
Sep 22	6:53	7:01
Oct 1	7:06	7:08
Oct 8	7:18	7:15
Oct 15	7:30	7:22
Oct 22	7:28	7:30
Nov 1	6:59	7:15
Nov 8	7:12	6:46
Nov 15	7:24	6:53
Nov 22	7:37	7:02
Average	7:06	7:06

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

Sunset Time

Period	London	San Francisco
Sep 1	19:40	19:34
Sep 8	19:25	19:23
Sep 15	19:08	19:13
Sep 22	18:49	19:00
Oct 1	18:31	18:47
Oct 8	18:16	18:37
Oct 15	18:01	18:28
Oct 22	17:27	18:17
Nov 1	16:28	17:44
Nov 8	16:17	17:01
Nov 15	16:07	16:56
Nov 22	15:59	16:52
Average	17:48	18:18

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

Useful Day Length

Period	London	San Francisco
Sep 1	12:40 hours	12:34 hours
Sep 8	12:25 hours	12:23 hours
Sep 15	12:08 hours	12:13 hours
Sep 22	11:49 hours	11:59 hours
Oct 1	11:25 hours	11:39 hours
Oct 8	10:58 hours	11:22 hours
Oct 15	10:31 hours	11:06 hours
Oct 22	9:59 hours	10:47 hours
Nov 1	9:28 hours	10:29 hours
Nov 8	9:05 hours	10:01 hours
Nov 15	8:43 hours	9:56 hours
Nov 22	8:22 hours	9:50 hours
Average	10:36 hours	11:12 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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Autumn weather

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Conditions

Astronomy

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