Autumn weather

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

Temperatures

Maximum Temperatures

Period	San Francisco	Dublin
Sep 1	74.8°F	63.0°F
Sep 8	72.7°F	61.5°F
Sep 15	69.8°F	60.8°F
Sep 22	71.6°F	58.6°F
Oct 1	72.5°F	58.5°F
Oct 8	69.1°F	57.6°F
Oct 15	70.5°F	56.3°F
Oct 22	68.4°F	55.0°F
Nov 1	66.2°F	52.9°F
Nov 8	62.2°F	53.2°F
Nov 15	62.6°F	50.7°F
Nov 22	60.8°F	48.7°F
Average	56.4°F	68.4°F

Minimum Temperatures

Period	San Francisco	Dublin
Sep 1	59.5°F	54.1°F
Sep 8	58.1°F	52.3°F
Sep 15	57.4°F	52.2°F
Sep 22	57.4°F	49.8°F
Oct 1	57.7°F	50.2°F
Oct 8	55.6°F	48.7°F
Oct 15	56.3°F	49.5°F
Oct 22	55.2°F	47.8°F
Nov 1	53.4°F	45.7°F
Nov 8	50.7°F	46.8°F
Nov 15	50.9°F	43.9°F
Nov 22	49.6°F	42.1°F
Average	48.6°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	San Francisco	Dublin
Sep 1	11.2 hours/day	4.1 hours/day
Sep 8	11.4 hours/day	2.4 hours/day
Sep 15	8.6 hours/day	4.6 hours/day
Sep 22	9.0 hours/day	2.2 hours/day
Oct 1	8.1 hours/day	1.8 hours/day
Oct 8	7.9 hours/day	3.0 hours/day
Oct 15	7.9 hours/day	2.4 hours/day
Oct 22	8.0 hours/day	2.7 hours/day
Nov 1	7.7 hours/day	2.6 hours/day
Nov 8	6.1 hours/day	1.8 hours/day
Nov 15	6.1 hours/day	1.8 hours/day
Nov 22	5.8 hours/day	1.7 hours/day
Average	2.6 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	San Francisco	Dublin
Sep 1	0.0in	0.1in
Sep 8	0.0in	0.1in
Sep 15	0.0in	0.1in
Sep 22	0.0in	0.2in
Oct 1	0.0in	0.1in
Oct 8	0.0in	0.1in
Oct 15	0.0in	0.1in
Oct 22	0.0in	0.1in
Nov 1	0.0in	0.1in
Nov 8	0.0in	0.1in
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	San Francisco	Dublin
Sep 1	9.5mph	13.4mph
Sep 8	10.2mph	13.8mph
Sep 15	11.3mph	13.4mph
Sep 22	9.6mph	16.9mph
Oct 1	8.8mph	17.8mph
Oct 8	9.4mph	15.5mph
Oct 15	9.1mph	17.8mph
Oct 22	9.1mph	16.7mph
Nov 1	8.7mph	16.7mph
Nov 8	8.4mph	18.3mph
Nov 15	8.3mph	18.2mph
Nov 22	8.9mph	17.5mph
Average	16.3mph	9.3mph

Humidity

Period	San Francisco	Dublin
Sep 1	70.8%	84.1%
Sep 8	73.6%	83.4%
Sep 15	76.3%	82.3%
Sep 22	71.0%	82.2%
Oct 1	65.9%	82.0%
Oct 8	67.2%	81.8%
Oct 15	65.8%	82.1%
Oct 22	64.7%	81.4%
Nov 1	65.4%	82.0%
Nov 8	67.5%	82.8%
Nov 15	63.6%	81.2%
Nov 22	65.9%	80.9%
Average	82.2%	68.1%

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Astronomy

Sunrise Time

Period	San Francisco	Dublin
Sep 1	6:43	6:40
Sep 8	6:49	6:52
Sep 15	6:54	7:04
Sep 22	7:01	7:18
Oct 1	7:08	7:32
Oct 8	7:15	7:45
Oct 15	7:22	7:58
Oct 22	7:30	7:57
Nov 1	7:15	7:29
Nov 8	6:46	7:43
Nov 15	6:53	7:56
Nov 22	7:02	8:09
Average	7:30	7:06

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

Sunset Time

Period	San Francisco	Dublin
Sep 1	19:34	20:07
Sep 8	19:23	19:50
Sep 15	19:13	19:34
Sep 22	19:00	19:14
Oct 1	18:47	18:55
Oct 8	18:37	18:38
Oct 15	18:28	18:22
Oct 22	18:17	17:47
Nov 1	17:44	16:47
Nov 8	17:01	16:35
Nov 15	16:56	16:24
Nov 22	16:52	16:15
Average	18:12	18:18

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

Useful Day Length

Period	San Francisco	Dublin
Sep 1	12:34 hours	13:07 hours
Sep 8	12:23 hours	12:50 hours
Sep 15	12:13 hours	12:30 hours
Sep 22	11:59 hours	11:56 hours
Oct 1	11:39 hours	11:22 hours
Oct 8	11:22 hours	10:53 hours
Oct 15	11:06 hours	10:24 hours
Oct 22	10:47 hours	9:50 hours
Nov 1	10:29 hours	9:17 hours
Nov 8	10:01 hours	8:52 hours
Nov 15	9:56 hours	8:28 hours
Nov 22	9:50 hours	8:06 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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Astronomy

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