Winter weather

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

Temperatures

Maximum Temperatures

Period	Chicago	Houston	Atlanta
Dec 1	40.5°F	68.5°F	56.8°F
Dec 8	39.2°F	68.2°F	54.9°F
Dec 15	38.3°F	64.6°F	53.6°F
Dec 22	36.9°F	65.8°F	54.7°F
Jan 1	32.9°F	63.3°F	52.7°F
Jan 8	32.9°F	61.9°F	51.1°F
Jan 15	28.0°F	60.3°F	48.7°F
Jan 22	30.2°F	62.6°F	52.2°F
Feb 1	32.5°F	66.4°F	56.5°F
Feb 8	30.7°F	64.2°F	58.1°F
Feb 15	35.2°F	64.9°F	57.6°F
Feb 22	40.3°F	70.7°F	63.3°F
Average	55.0°F	34.8°F	65.1°F

Minimum Temperatures

Period	Chicago	Houston	Atlanta
Dec 1	31.5°F	54.9°F	42.8°F
Dec 8	30.9°F	53.4°F	41.9°F
Dec 15	30.9°F	52.2°F	41.4°F
Dec 22	28.6°F	52.3°F	41.9°F
Jan 1	25.0°F	48.9°F	39.4°F
Jan 8	24.1°F	47.3°F	37.8°F
Jan 15	18.3°F	46.4°F	34.3°F
Jan 22	20.7°F	49.5°F	37.6°F
Feb 1	22.5°F	52.2°F	41.5°F
Feb 8	21.4°F	50.4°F	43.9°F
Feb 15	23.4°F	50.2°F	42.4°F
Feb 22	28.9°F	56.5°F	48.6°F
Average	41.1°F	25.5°F	51.2°F

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

Conditions

Sunny Weather

Period	Chicago	Houston	Atlanta
Dec 1	3.9 hours/day	4.4 hours/day	4.9 hours/day
Dec 8	3.4 hours/day	4.4 hours/day	3.6 hours/day
Dec 15	2.7 hours/day	3.5 hours/day	4.0 hours/day
Dec 22	1.9 hours/day	3.6 hours/day	4.1 hours/day
Jan 1	2.5 hours/day	4.8 hours/day	4.6 hours/day
Jan 8	2.4 hours/day	4.6 hours/day	4.4 hours/day
Jan 15	2.6 hours/day	3.7 hours/day	5.3 hours/day
Jan 22	1.8 hours/day	3.8 hours/day	4.7 hours/day
Feb 1	2.5 hours/day	2.9 hours/day	3.9 hours/day
Feb 8	2.9 hours/day	3.0 hours/day	3.3 hours/day
Feb 15	3.8 hours/day	2.9 hours/day	3.4 hours/day
Feb 22	3.3 hours/day	3.9 hours/day	3.9 hours/day
Average	4.2 hours/day	2.8 hours/day	3.8 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	Chicago	Houston	Atlanta
Dec 1	0.1in	0.1in	0.2in
Dec 8	0.1in	0.1in	0.2in
Dec 15	0.0in	0.1in	0.1in
Dec 22	0.1in	0.2in	0.2in
Jan 1	0.1in	0.1in	0.2in
Jan 8	0.2in	0.2in	0.2in
Jan 15	0.1in	0.1in	0.1in
Jan 22	0.1in	0.2in	0.2in
Feb 1	0.1in	0.1in	0.2in
Feb 8	0.1in	0.1in	0.3in
Feb 15	0.2in	0.1in	0.2in
Feb 22	0.1in	0.1in	0.1in
Average	0.2in	0.1in	0.1in

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

Wind Speed

Period	Chicago	Houston	Atlanta
Dec 1	14.6mph	9.8mph	9.4mph
Dec 8	15.1mph	12.0mph	10.3mph
Dec 15	14.0mph	10.8mph	9.7mph
Dec 22	14.8mph	11.6mph	10.3mph
Jan 1	13.8mph	11.1mph	11.2mph
Jan 8	15.2mph	11.6mph	11.0mph
Jan 15	15.3mph	11.9mph	11.2mph
Jan 22	13.9mph	10.8mph	10.2mph
Feb 1	14.8mph	11.4mph	10.1mph
Feb 8	13.1mph	11.4mph	10.6mph
Feb 15	14.5mph	12.3mph	10.4mph
Feb 22	15.1mph	11.9mph	10.5mph
Average	10.4mph	14.5mph	11.4mph

Humidity

Period	Chicago	Houston	Atlanta
Dec 1	67.0%	66.6%	65.0%
Dec 8	70.1%	67.4%	71.5%
Dec 15	71.1%	67.5%	68.8%
Dec 22	79.2%	69.3%	70.6%
Jan 1	77.8%	63.4%	64.1%
Jan 8	78.3%	65.5%	68.3%
Jan 15	78.3%	64.3%	61.6%
Jan 22	81.1%	68.0%	64.9%
Feb 1	80.7%	72.9%	70.8%
Feb 8	76.4%	71.1%	72.1%
Feb 15	77.3%	75.0%	71.0%
Feb 22	75.9%	72.2%	68.6%
Average	68.1%	76.1%	68.6%

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Astronomy

Sunrise Time

Period	Chicago	Houston	Atlanta
Dec 1	7:02	7:02	7:27
Dec 8	7:08	7:07	7:32
Dec 15	7:13	7:11	7:37
Dec 22	7:17	7:15	7:41
Jan 1	7:19	7:17	7:43
Jan 8	7:17	7:18	7:43
Jan 15	7:14	7:17	7:41
Jan 22	7:08	7:14	7:38
Feb 1	7:00	7:10	7:32
Feb 8	6:52	7:04	7:26
Feb 15	6:42	6:58	7:19
Feb 22	6:31	6:51	7:11
Average	7:30	7:06	7:06

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

Sunset Time

Period	Chicago	Houston	Atlanta
Dec 1	16:20	17:22	17:29
Dec 8	16:19	17:23	17:30
Dec 15	16:22	17:26	17:32
Dec 22	16:26	17:30	17:37
Jan 1	16:33	17:36	17:43
Jan 8	16:40	17:41	17:49
Jan 15	16:48	17:47	17:55
Jan 22	16:59	17:55	18:03
Feb 1	17:10	18:02	18:11
Feb 8	17:19	18:07	18:18
Feb 15	17:28	18:13	18:25
Feb 22	17:37	18:18	18:31
Average	17:54	16:48	17:48

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

Useful Day Length

Period	Chicago	Houston	Atlanta
Dec 1	9:18 hours	10:20 hours	10:02 hours
Dec 8	9:11 hours	10:17 hours	9:58 hours
Dec 15	9:08 hours	10:14 hours	9:55 hours
Dec 22	9:08 hours	10:15 hours	9:56 hours
Jan 1	9:14 hours	10:19 hours	9:59 hours
Jan 8	9:23 hours	10:23 hours	10:05 hours
Jan 15	9:34 hours	10:30 hours	10:14 hours
Jan 22	9:50 hours	10:40 hours	10:25 hours
Feb 1	10:10 hours	10:52 hours	10:39 hours
Feb 8	10:19 hours	11:03 hours	10:52 hours
Feb 15	10:28 hours	11:13 hours	11:05 hours
Feb 22	10:37 hours	11:18 hours	11:20 hours
Average	10:24 hours	9:42 hours	10:36 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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