Winter weather

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

Temperatures

Maximum Temperatures

Period	Houston	Philadelphia
Dec 1	20.3°C	8.5°C
Dec 8	20.1°C	7.8°C
Dec 15	18.1°C	6.8°C
Dec 22	18.8°C	7.1°C
Jan 1	17.4°C	5.6°C
Jan 8	16.6°C	6.0°C
Jan 15	15.7°C	3.3°C
Jan 22	17.0°C	4.6°C
Feb 1	19.1°C	5.7°C
Feb 8	17.9°C	6.6°C
Feb 15	18.3°C	7.8°C
Feb 22	21.5°C	9.7°C
Average	18.4°C	6.6°C

Minimum Temperatures

Period	Houston	Philadelphia
Dec 1	12.7°C	2.1°C
Dec 8	11.9°C	1.0°C
Dec 15	11.2°C	0.8°C
Dec 22	11.3°C	0.6°C
Jan 1	9.4°C	-0.1°C
Jan 8	8.5°C	-1.2°C
Jan 15	8.0°C	-3.0°C
Jan 22	9.7°C	-1.9°C
Feb 1	11.2°C	-1.6°C
Feb 8	10.2°C	0.1°C
Feb 15	10.1°C	-0.1°C
Feb 22	13.6°C	1.9°C
Average	10.7°C	-0.1°C

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

Conditions

Sunny Weather

Period	Houston	Philadelphia
Dec 1	4.4 hours/day	3.9 hours/day
Dec 8	4.4 hours/day	3.6 hours/day
Dec 15	3.5 hours/day	3.1 hours/day
Dec 22	3.6 hours/day	3.3 hours/day
Jan 1	4.8 hours/day	3.1 hours/day
Jan 8	4.6 hours/day	3.7 hours/day
Jan 15	3.7 hours/day	3.6 hours/day
Jan 22	3.8 hours/day	3.3 hours/day
Feb 1	2.9 hours/day	3.6 hours/day
Feb 8	3.0 hours/day	3.5 hours/day
Feb 15	2.9 hours/day	5.3 hours/day
Feb 22	3.9 hours/day	4.0 hours/day
Average	3.8 hours/day	3.7 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	Houston	Philadelphia
Dec 1	2.9mm	2.6mm
Dec 8	3.7mm	4.9mm
Dec 15	2.8mm	5.8mm
Dec 22	4.3mm	4.3mm
Jan 1	3.5mm	3.6mm
Jan 8	5.1mm	2.6mm
Jan 15	2.9mm	3.1mm
Jan 22	5.6mm	2.8mm
Feb 1	1.6mm	5.1mm
Feb 8	3.2mm	6.4mm
Feb 15	3.2mm	6.5mm
Feb 22	2.9mm	2.6mm
Average	3.5mm	4.2mm

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

Wind Speed

Period	Houston	Philadelphia
Dec 1	15.7km/h	17.9km/h
Dec 8	19.2km/h	16.5km/h
Dec 15	17.2km/h	18.1km/h
Dec 22	18.6km/h	15.8km/h
Jan 1	17.7km/h	18.2km/h
Jan 8	18.6km/h	19.5km/h
Jan 15	19.0km/h	19.2km/h
Jan 22	17.3km/h	17.5km/h
Feb 1	18.2km/h	16.7km/h
Feb 8	18.3km/h	17.9km/h
Feb 15	19.6km/h	19.3km/h
Feb 22	19.0km/h	19.0km/h
Average	18.2km/h	18.0km/h

Humidity

Period	Houston	Philadelphia
Dec 1	66.6%	65.9%
Dec 8	67.4%	67.5%
Dec 15	67.5%	70.7%
Dec 22	69.3%	69.5%
Jan 1	63.4%	70.4%
Jan 8	65.5%	66.3%
Jan 15	64.3%	66.0%
Jan 22	68.0%	64.4%
Feb 1	72.9%	71.2%
Feb 8	71.1%	67.2%
Feb 15	75.0%	66.2%
Feb 22	72.2%	66.2%
Average	68.6%	67.6%

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Astronomy

Sunrise Time

Period	Houston	Philadelphia
Dec 1	7:02	7:06
Dec 8	7:07	7:13
Dec 15	7:11	7:17
Dec 22	7:15	7:21
Jan 1	7:17	7:23
Jan 8	7:18	7:22
Jan 15	7:17	7:19
Jan 22	7:14	7:14
Feb 1	7:10	7:06
Feb 8	7:04	6:58
Feb 15	6:58	6:49
Feb 22	6:51	6:40
Average	7:06	7:06

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

Sunset Time

Period	Houston	Philadelphia
Dec 1	17:22	16:35
Dec 8	17:23	16:35
Dec 15	17:26	16:37
Dec 22	17:30	16:42
Jan 1	17:36	16:49
Jan 8	17:41	16:56
Jan 15	17:47	17:04
Jan 22	17:55	17:13
Feb 1	18:02	17:23
Feb 8	18:07	17:32
Feb 15	18:13	17:40
Feb 22	18:18	17:49
Average	17:48	17:06

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

Useful Day Length

Period	Houston	Philadelphia
Dec 1	10:20 hours	9:29 hours
Dec 8	10:17 hours	9:23 hours
Dec 15	10:14 hours	9:20 hours
Dec 22	10:15 hours	9:21 hours
Jan 1	10:19 hours	9:26 hours
Jan 8	10:23 hours	9:34 hours
Jan 15	10:30 hours	9:44 hours
Jan 22	10:40 hours	9:59 hours
Feb 1	10:52 hours	10:17 hours
Feb 8	11:03 hours	10:32 hours
Feb 15	11:13 hours	10:40 hours
Feb 22	11:18 hours	10:49 hours
Average	10:36 hours	9:54 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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