Winter weather

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

Temperatures

Maximum Temperatures

Period	San Francisco	Lusaka
Dec 1	58.5°F	88.3°F
Dec 8	57.6°F	85.1°F
Dec 15	56.5°F	82.2°F
Dec 22	56.3°F	81.7°F
Jan 1	56.3°F	78.1°F
Jan 8	57.4°F	77.0°F
Jan 15	56.8°F	75.4°F
Jan 22	58.1°F	77.2°F
Feb 1	58.5°F	78.6°F
Feb 8	58.5°F	77.9°F
Feb 15	57.2°F	78.6°F
Feb 22	57.0°F	78.6°F
Average	79.9°F	57.4°F

Minimum Temperatures

Period	San Francisco	Lusaka
Dec 1	48.9°F	66.7°F
Dec 8	48.0°F	66.4°F
Dec 15	46.8°F	65.7°F
Dec 22	47.5°F	65.3°F
Jan 1	47.3°F	64.2°F
Jan 8	47.8°F	64.2°F
Jan 15	47.8°F	63.7°F
Jan 22	47.1°F	63.0°F
Feb 1	47.1°F	63.5°F
Feb 8	47.1°F	63.5°F
Feb 15	46.2°F	63.7°F
Feb 22	45.9°F	63.3°F
Average	64.4°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	Lusaka
Dec 1	4.0 hours/day	8.2 hours/day
Dec 8	4.2 hours/day	4.4 hours/day
Dec 15	4.2 hours/day	3.5 hours/day
Dec 22	3.4 hours/day	3.4 hours/day
Jan 1	3.8 hours/day	1.1 hours/day
Jan 8	4.9 hours/day	1.1 hours/day
Jan 15	3.7 hours/day	0.6 hours/day
Jan 22	5.3 hours/day	1.9 hours/day
Feb 1	5.3 hours/day	1.5 hours/day
Feb 8	5.8 hours/day	1.6 hours/day
Feb 15	5.9 hours/day	2.5 hours/day
Feb 22	6.2 hours/day	2.0 hours/day
Average	2.7 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	Lusaka
Dec 1	0.1in	0.1in
Dec 8	0.2in	0.2in
Dec 15	0.1in	0.3in
Dec 22	0.2in	0.3in
Jan 1	0.1in	0.5in
Jan 8	0.2in	0.5in
Jan 15	0.1in	0.4in
Jan 22	0.1in	0.3in
Feb 1	0.2in	0.2in
Feb 8	0.2in	0.4in
Feb 15	0.1in	0.2in
Feb 22	0.1in	0.3in
Average	0.3in	0.1in

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

Wind Speed

Period	San Francisco	Lusaka
Dec 1	8.6mph	9.4mph
Dec 8	9.8mph	8.6mph
Dec 15	8.9mph	7.9mph
Dec 22	9.9mph	7.9mph
Jan 1	10.4mph	6.8mph
Jan 8	10.5mph	6.8mph
Jan 15	9.3mph	6.9mph
Jan 22	9.1mph	7.4mph
Feb 1	11.8mph	6.8mph
Feb 8	10.8mph	7.5mph
Feb 15	11.1mph	7.1mph
Feb 22	11.6mph	7.4mph
Average	7.5mph	10.1mph

Humidity

Period	San Francisco	Lusaka
Dec 1	72.7%	50.4%
Dec 8	69.6%	64.9%
Dec 15	71.7%	73.9%
Dec 22	74.9%	74.8%
Jan 1	75.9%	83.4%
Jan 8	74.9%	86.7%
Jan 15	73.6%	88.7%
Jan 22	71.8%	85.2%
Feb 1	69.2%	85.9%
Feb 8	70.4%	86.7%
Feb 15	70.8%	84.3%
Feb 22	69.6%	84.3%
Average	79.1%	72.1%

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Astronomy

Sunrise Time

Period	San Francisco	Lusaka
Dec 1	7:10	5:28
Dec 8	7:16	5:29
Dec 15	7:20	5:32
Dec 22	7:24	5:37
Jan 1	7:26	5:41
Jan 8	7:25	5:46
Jan 15	7:23	5:50
Jan 22	7:18	5:55
Feb 1	7:11	5:59
Feb 8	7:04	6:02
Feb 15	6:55	6:04
Feb 22	6:46	6:06
Average	5:48	7:12

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

Sunset Time

Period	San Francisco	Lusaka
Dec 1	16:50	18:26
Dec 8	16:51	18:31
Dec 15	16:53	18:35
Dec 22	16:58	18:39
Jan 1	17:04	18:42
Jan 8	17:11	18:44
Jan 15	17:18	18:44
Jan 22	17:28	18:44
Feb 1	17:37	18:43
Feb 8	17:45	18:40
Feb 15	17:52	18:37
Feb 22	17:59	18:33
Average	18:36	17:18

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

Useful Day Length

Period	San Francisco	Lusaka
Dec 1	9:41 hours	11:26 hours
Dec 8	9:35 hours	11:31 hours
Dec 15	9:33 hours	11:35 hours
Dec 22	9:34 hours	11:39 hours
Jan 1	9:38 hours	11:42 hours
Jan 8	9:46 hours	11:44 hours
Jan 15	9:55 hours	11:44 hours
Jan 22	10:10 hours	11:44 hours
Feb 1	10:26 hours	11:43 hours
Feb 8	10:41 hours	11:40 hours
Feb 15	10:52 hours	11:37 hours
Feb 22	10:59 hours	11:33 hours
Average	11:36 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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