Winter weather

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

Temperatures

Maximum Temperatures

Period	San Francisco	Porto Alegre
Dec 1	58.5°F	82.0°F
Dec 8	57.6°F	87.3°F
Dec 15	56.5°F	86.4°F
Dec 22	56.3°F	88.2°F
Jan 1	56.3°F	88.3°F
Jan 8	57.4°F	89.2°F
Jan 15	56.8°F	88.9°F
Jan 22	58.1°F	89.6°F
Feb 1	58.5°F	89.4°F
Feb 8	58.5°F	90.3°F
Feb 15	57.2°F	86.7°F
Feb 22	57.0°F	88.2°F
Average	87.9°F	57.4°F

Minimum Temperatures

Period	San Francisco	Porto Alegre
Dec 1	48.9°F	66.0°F
Dec 8	48.0°F	66.6°F
Dec 15	46.8°F	69.3°F
Dec 22	47.5°F	68.0°F
Jan 1	47.3°F	69.6°F
Jan 8	47.8°F	70.5°F
Jan 15	47.8°F	71.4°F
Jan 22	47.1°F	71.6°F
Feb 1	47.1°F	70.3°F
Feb 8	47.1°F	70.2°F
Feb 15	46.2°F	69.3°F
Feb 22	45.9°F	70.0°F
Average	69.4°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	Porto Alegre
Dec 1	4.0 hours/day	5.5 hours/day
Dec 8	4.2 hours/day	8.7 hours/day
Dec 15	4.2 hours/day	5.2 hours/day
Dec 22	3.4 hours/day	8.9 hours/day
Jan 1	3.8 hours/day	6.7 hours/day
Jan 8	4.9 hours/day	8.1 hours/day
Jan 15	3.7 hours/day	5.2 hours/day
Jan 22	5.3 hours/day	5.8 hours/day
Feb 1	5.3 hours/day	7.7 hours/day
Feb 8	5.8 hours/day	7.4 hours/day
Feb 15	5.9 hours/day	6.3 hours/day
Feb 22	6.2 hours/day	6.0 hours/day
Average	6.8 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	Porto Alegre
Dec 1	0.1in	0.2in
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	0.2in
Jan 22	0.1in	0.1in
Feb 1	0.2in	0.1in
Feb 8	0.2in	0.1in
Feb 15	0.1in	0.2in
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	Porto Alegre
Dec 1	8.6mph	11.7mph
Dec 8	9.8mph	11.0mph
Dec 15	8.9mph	11.9mph
Dec 22	9.9mph	11.4mph
Jan 1	10.4mph	11.6mph
Jan 8	10.5mph	11.8mph
Jan 15	9.3mph	11.8mph
Jan 22	9.1mph	11.2mph
Feb 1	11.8mph	11.6mph
Feb 8	10.8mph	11.6mph
Feb 15	11.1mph	10.6mph
Feb 22	11.6mph	10.5mph
Average	11.4mph	10.1mph

Humidity

Period	San Francisco	Porto Alegre
Dec 1	72.7%	68.0%
Dec 8	69.6%	61.3%
Dec 15	71.7%	68.4%
Dec 22	74.9%	64.1%
Jan 1	75.9%	63.5%
Jan 8	74.9%	64.7%
Jan 15	73.6%	69.2%
Jan 22	71.8%	64.8%
Feb 1	69.2%	65.9%
Feb 8	70.4%	63.2%
Feb 15	70.8%	66.7%
Feb 22	69.6%	67.5%
Average	65.6%	72.1%

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Astronomy

Sunrise Time

Period	San Francisco	Porto Alegre
Dec 1	7:10	5:31
Dec 8	7:16	5:32
Dec 15	7:20	5:34
Dec 22	7:24	5:38
Jan 1	7:26	5:44
Jan 8	7:25	5:50
Jan 15	7:23	5:56
Jan 22	7:18	6:04
Feb 1	7:11	6:11
Feb 8	7:04	6:17
Feb 15	6:55	6:13
Feb 22	6:46	6:13
Average	5:54	7:12

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

Sunset Time

Period	San Francisco	Porto Alegre
Dec 1	16:50	19:29
Dec 8	16:51	19:35
Dec 15	16:53	19:39
Dec 22	16:58	19:43
Jan 1	17:04	19:45
Jan 8	17:11	19:46
Jan 15	17:18	19:44
Jan 22	17:28	19:41
Feb 1	17:37	19:36
Feb 8	17:45	19:31
Feb 15	17:52	19:16
Feb 22	17:59	19:02
Average	19:36	17:18

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

Useful Day Length

Period	San Francisco	Porto Alegre
Dec 1	9:41 hours	12:29 hours
Dec 8	9:35 hours	12:35 hours
Dec 15	9:33 hours	12:39 hours
Dec 22	9:34 hours	12:43 hours
Jan 1	9:38 hours	12:45 hours
Jan 8	9:46 hours	12:46 hours
Jan 15	9:55 hours	12:44 hours
Jan 22	10:10 hours	12:41 hours
Feb 1	10:26 hours	12:36 hours
Feb 8	10:41 hours	12:31 hours
Feb 15	10:52 hours	12:16 hours
Feb 22	10:59 hours	12:02 hours
Average	12:36 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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