Winter weather

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

Temperatures

Maximum Temperatures

Period	San Francisco	Dublin
Dec 1	58.5°F	48.2°F
Dec 8	57.6°F	46.6°F
Dec 15	56.5°F	49.6°F
Dec 22	56.3°F	49.1°F
Jan 1	56.3°F	46.4°F
Jan 8	57.4°F	46.4°F
Jan 15	56.8°F	45.9°F
Jan 22	58.1°F	47.3°F
Feb 1	58.5°F	47.7°F
Feb 8	58.5°F	46.0°F
Feb 15	57.2°F	50.2°F
Feb 22	57.0°F	47.7°F
Average	47.6°F	57.4°F

Minimum Temperatures

Period	San Francisco	Dublin
Dec 1	48.9°F	40.8°F
Dec 8	48.0°F	40.3°F
Dec 15	46.8°F	43.2°F
Dec 22	47.5°F	43.0°F
Jan 1	47.3°F	39.6°F
Jan 8	47.8°F	39.7°F
Jan 15	47.8°F	37.8°F
Jan 22	47.1°F	39.4°F
Feb 1	47.1°F	39.9°F
Feb 8	47.1°F	39.4°F
Feb 15	46.2°F	43.0°F
Feb 22	45.9°F	39.4°F
Average	40.5°F	47.3°F

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

Conditions

Sunny Weather

Period	San Francisco	Dublin
Dec 1	4.0 hours/day	1.6 hours/day
Dec 8	4.2 hours/day	1.7 hours/day
Dec 15	4.2 hours/day	2.4 hours/day
Dec 22	3.4 hours/day	0.6 hours/day
Jan 1	3.8 hours/day	2.2 hours/day
Jan 8	4.9 hours/day	2.0 hours/day
Jan 15	3.7 hours/day	2.4 hours/day
Jan 22	5.3 hours/day	2.0 hours/day
Feb 1	5.3 hours/day	2.1 hours/day
Feb 8	5.8 hours/day	1.3 hours/day
Feb 15	5.9 hours/day	1.1 hours/day
Feb 22	6.2 hours/day	2.5 hours/day
Average	1.8 hours/day	4.7 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
Dec 1	0.1in	0.1in
Dec 8	0.2in	0.1in
Dec 15	0.1in	0.1in
Dec 22	0.2in	0.1in
Jan 1	0.1in	0.1in
Jan 8	0.2in	0.1in
Jan 15	0.1in	0.1in
Jan 22	0.1in	0.1in
Feb 1	0.2in	0.1in
Feb 8	0.2in	0.1in
Feb 15	0.1in	0.1in
Feb 22	0.1in	0.1in
Average	0.1in	0.1in

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

Wind Speed

Period	San Francisco	Dublin
Dec 1	8.6mph	18.5mph
Dec 8	9.8mph	19.4mph
Dec 15	8.9mph	18.3mph
Dec 22	9.9mph	19.0mph
Jan 1	10.4mph	17.9mph
Jan 8	10.5mph	16.6mph
Jan 15	9.3mph	16.4mph
Jan 22	9.1mph	18.6mph
Feb 1	11.8mph	18.4mph
Feb 8	10.8mph	20.8mph
Feb 15	11.1mph	20.4mph
Feb 22	11.6mph	18.9mph
Average	18.6mph	10.1mph

Humidity

Period	San Francisco	Dublin
Dec 1	72.7%	81.4%
Dec 8	69.6%	80.4%
Dec 15	71.7%	82.0%
Dec 22	74.9%	83.8%
Jan 1	75.9%	81.0%
Jan 8	74.9%	81.9%
Jan 15	73.6%	80.8%
Jan 22	71.8%	81.7%
Feb 1	69.2%	80.3%
Feb 8	70.4%	80.5%
Feb 15	70.8%	84.2%
Feb 22	69.6%	79.0%
Average	81.4%	72.1%

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Astronomy

Sunrise Time

Period	San Francisco	Dublin
Dec 1	7:10	8:21
Dec 8	7:16	8:30
Dec 15	7:20	8:36
Dec 22	7:24	8:40
Jan 1	7:26	8:39
Jan 8	7:25	8:35
Jan 15	7:23	8:29
Jan 22	7:18	8:18
Feb 1	7:11	8:05
Feb 8	7:04	7:52
Feb 15	6:55	7:37
Feb 22	6:46	7:22
Average	8:18	7:12

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

Sunset Time

Period	San Francisco	Dublin
Dec 1	16:50	16:08
Dec 8	16:51	16:06
Dec 15	16:53	16:07
Dec 22	16:58	16:12
Jan 1	17:04	16:20
Jan 8	17:11	16:30
Jan 15	17:18	16:42
Jan 22	17:28	16:58
Feb 1	17:37	17:14
Feb 8	17:45	17:28
Feb 15	17:52	17:42
Feb 22	17:59	17:55
Average	16:48	17:18

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

Useful Day Length

Period	San Francisco	Dublin
Dec 1	9:41 hours	7:47 hours
Dec 8	9:35 hours	7:36 hours
Dec 15	9:33 hours	7:31 hours
Dec 22	9:34 hours	7:32 hours
Jan 1	9:38 hours	7:41 hours
Jan 8	9:46 hours	7:55 hours
Jan 15	9:55 hours	8:13 hours
Jan 22	10:10 hours	8:40 hours
Feb 1	10:26 hours	9:09 hours
Feb 8	10:41 hours	9:37 hours
Feb 15	10:52 hours	10:05 hours
Feb 22	10:59 hours	10:33 hours
Average	8:30 hours	10:06 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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Winter weather

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