Autumn weather

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

Temperatures

Maximum Temperatures

Period	Pittsburgh	Brussels
Sep 1	80.4°F	73.0°F
Sep 8	78.1°F	69.8°F
Sep 15	79.2°F	69.6°F
Sep 22	73.6°F	64.4°F
Oct 1	72.3°F	61.7°F
Oct 8	68.5°F	62.4°F
Oct 15	61.7°F	62.2°F
Oct 22	61.0°F	58.3°F
Nov 1	57.9°F	54.9°F
Nov 8	51.6°F	52.9°F
Nov 15	47.1°F	48.9°F
Nov 22	45.7°F	47.1°F
Average	60.4°F	64.8°F

Minimum Temperatures

Period	Pittsburgh	Brussels
Sep 1	61.3°F	56.8°F
Sep 8	59.5°F	55.8°F
Sep 15	59.5°F	53.6°F
Sep 22	57.2°F	51.1°F
Oct 1	54.7°F	50.0°F
Oct 8	52.2°F	50.2°F
Oct 15	45.1°F	51.1°F
Oct 22	45.5°F	48.4°F
Nov 1	42.1°F	44.6°F
Nov 8	37.2°F	44.1°F
Nov 15	34.0°F	40.3°F
Nov 22	33.3°F	39.4°F
Average	48.8°F	48.5°F

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

Conditions

Sunny Weather

Period	Pittsburgh	Brussels
Sep 1	6.4 hours/day	5.7 hours/day
Sep 8	5.1 hours/day	4.3 hours/day
Sep 15	7.3 hours/day	6.1 hours/day
Sep 22	4.6 hours/day	3.7 hours/day
Oct 1	4.0 hours/day	2.9 hours/day
Oct 8	5.2 hours/day	3.6 hours/day
Oct 15	4.2 hours/day	2.9 hours/day
Oct 22	3.6 hours/day	2.2 hours/day
Nov 1	4.5 hours/day	3.4 hours/day
Nov 8	4.5 hours/day	2.5 hours/day
Nov 15	1.9 hours/day	2.0 hours/day
Nov 22	2.4 hours/day	1.9 hours/day
Average	3.4 hours/day	4.5 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	Pittsburgh	Brussels
Sep 1	0.2in	0.1in
Sep 8	0.2in	0.1in
Sep 15	0.1in	0.0in
Sep 22	0.2in	0.1in
Oct 1	0.1in	0.1in
Oct 8	0.1in	0.1in
Oct 15	0.1in	0.1in
Oct 22	0.2in	0.1in
Nov 1	0.1in	0.1in
Nov 8	0.2in	0.1in
Nov 15	0.1in	0.1in
Nov 22	0.1in	0.1in
Average	0.1in	0.2in

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

Wind Speed

Period	Pittsburgh	Brussels
Sep 1	7.9mph	9.7mph
Sep 8	7.6mph	11.6mph
Sep 15	6.7mph	10.9mph
Sep 22	8.5mph	12.7mph
Oct 1	7.5mph	14.8mph
Oct 8	8.9mph	12.3mph
Oct 15	9.5mph	12.8mph
Oct 22	9.0mph	14.4mph
Nov 1	9.2mph	13.8mph
Nov 8	8.9mph	12.9mph
Nov 15	10.4mph	13.8mph
Nov 22	9.9mph	13.6mph
Average	12.8mph	8.7mph

Humidity

Period	Pittsburgh	Brussels
Sep 1	68.2%	69.7%
Sep 8	70.4%	73.0%
Sep 15	66.2%	69.3%
Sep 22	71.3%	74.2%
Oct 1	72.1%	76.8%
Oct 8	68.5%	76.3%
Oct 15	67.3%	78.1%
Oct 22	72.2%	79.7%
Nov 1	68.7%	79.4%
Nov 8	65.6%	82.3%
Nov 15	71.1%	82.1%
Nov 22	71.5%	83.2%
Average	77.0%	69.4%

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Astronomy

Sunrise Time

Period	Pittsburgh	Brussels
Sep 1	6:50	7:01
Sep 8	6:57	7:12
Sep 15	7:04	7:23
Sep 22	7:12	7:35
Oct 1	7:20	7:48
Oct 8	7:27	7:59
Oct 15	7:35	8:11
Oct 22	7:44	8:08
Nov 1	7:30	7:40
Nov 8	7:02	7:52
Nov 15	7:10	8:03
Nov 22	7:19	8:16
Average	7:48	7:18

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

Sunset Time

Period	Pittsburgh	Brussels
Sep 1	19:47	20:21
Sep 8	19:35	20:05
Sep 15	19:24	19:50
Sep 22	19:10	19:32
Oct 1	18:57	19:14
Oct 8	18:46	18:59
Oct 15	18:35	18:44
Oct 22	18:23	18:11
Nov 1	17:50	17:13
Nov 8	17:06	17:01
Nov 15	17:00	16:52
Nov 22	16:56	16:44
Average	18:36	18:30

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

Useful Day Length

Period	Pittsburgh	Brussels
Sep 1	12:47 hours	13:20 hours
Sep 8	12:35 hours	12:53 hours
Sep 15	12:20 hours	12:28 hours
Sep 22	11:58 hours	11:57 hours
Oct 1	11:37 hours	11:26 hours
Oct 8	11:19 hours	10:59 hours
Oct 15	10:60 hours	10:33 hours
Oct 22	10:40 hours	10:02 hours
Nov 1	10:20 hours	9:33 hours
Nov 8	10:04 hours	9:10 hours
Nov 15	9:50 hours	8:49 hours
Nov 22	9:37 hours	8:28 hours
Average	10:48 hours	11:12 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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Autumn weather

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Astronomy

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