September 2012 Weather History in Chicago Illinois, United States

The data for this report comes from the Chicago Midway International Airport. See all nearby weather stations

This report shows the past weather for Chicago, providing a weather history for September 2012. It features all historical weather data series we have available, including the Chicago temperature history for September 2012. You can drill down from year to month and even day level reports by clicking on the graphs.

Chicago Temperature History September 2012

Temperature history in September 2012 in Chicago1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303030°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FAugOct
The daily range of reported temperatures (gray bars) and 24-hour highs (red ticks) and lows (blue ticks), placed over the daily average high (faint red line) and low (faint blue line) temperature, with 25th to 75th and 10th to 90th percentile bands.

Hourly Temperature in September 2012 in Chicago

Hourly Temperature in September 2012 in Chicago1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOctcoldcoolcomfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The hourly reported temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
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Cloud Cover in September 2012 in Chicago

Cloud Cover in September 2012 in Chicago1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
no significant cloudno cloud detectedceiling and visibility ok
The hourly reported cloud coverage, categorized by the percentage of the sky covered by clouds.

Daily Precipitation in September 2012 in Chicago

Daily Precipitation in September 2012 in Chicago181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 inAugOct
The daily measured quantity of liquid or liquid-equivalent precipitation.

Observed Weather in September 2012 in Chicago

Observed Weather in September 2012 in Chicago1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
foghazedrizzlelight rainmoderate rainheavy rainfreezing rainsleetsnow grainslight snowmoderate snowheavy snowhailthunderstorm
The hourly observed weather, color coded by category (in order of severity). If multiple reports are present, the most severe code is shown.
DayObservationsPrecipitationCodes
Sat, Sep 1 Heavy Rain, Light Rain, Mist0.25 in+RA, -RA, BR
Tue, Sep 4 Thunderstorm with Light Rain, Thunderstorm with Rain, Light Rain, Mist, Squall0.23 in-TSRA, TSRA, -RA, BR, SQ
Wed, Sep 5 Thunderstorm with Light Rain, Thunderstorm with Rain, Light Rain, Mist0.13 in-TSRA, TSRA, -RA, BR
Fri, Sep 7 Rain, Light Rain, Mist0.20 inRA, -RA, BR
Sat, Sep 8 Light Rain0.23 in-RA
Thu, Sep 13 Light Rain, Mist0.13 in-RA, BR
Fri, Sep 14 Light Drizzle0.00 in-DZ
Mon, Sep 17 Thunderstorm, Thunderstorm with Light Rain, Heavy Rain, Light Rain0.17 inTS, -TSRA, +RA, -RA
Fri, Sep 21 Light Rain, Mist0.13 in-RA, BR
Sat, Sep 22 Light Rain0.01 in-RA
Wed, Sep 26 Haze, MistHZ, BR

Hours of Daylight and Twilight in September 2012 in Chicago

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

Sunrise & Sunset with Twilight in September 2012 in Chicago

The solar day over the course of September 2012. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.

Solar Elevation and Azimuth in September 2012 in Chicago

Solar Elevation and Azimuth in September 2012 in ChicagoSep11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMAugOct0010102020303040405000101020203030404050
northeastsouthwest
Solar elevation and azimuth over the course of September 2012. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

Moon Rise, Set & Phases in September 2012 in Chicago

Moon Rise, Set & Phases in September 2012 in Chicago1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAugOctAug 318:59 AMAug 318:59 AMSep 159:11 PMSep 159:11 PMSep 2910:19 PMSep 2910:19 PM6:39 PM6:39 PM6:22 AM6:22 AM6:01 AM6:01 AM6:28 PM6:28 PM6:05 PM6:05 PM7:19 AM7:19 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.
Sep 2012IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
100%-7:27 AMW7:36 PME1:16 AMS241,062 mi
2
97%-8:30 AMW8:04 PME2:01 AMS243,632 mi
3
92%-9:32 AMWNW8:33 PMENE2:45 AMS246,093 mi
4
86%-10:32 AMWNW9:04 PMENE3:30 AMS248,254 mi
5
78%-11:31 AMWNW9:39 PMENE4:15 AMS249,927 mi
6
70%-12:28 PMWNW10:17 PMENE5:01 AMS250,950 mi
7
60%-1:22 PMWNW11:00 PMENE5:48 AMS251,202 mi
8
50%-2:12 PMWNW11:49 PMENE6:36 AMS250,617 mi
9
41%-2:59 PMWNW-7:25 AMS249,194 mi
10
31%12:42 AMENE3:41 PMWNW-8:13 AMS247,010 mi
11
22%1:40 AMENE4:19 PMWNW-9:02 AMS244,209 mi
12
14%2:42 AMENE4:54 PMWNW-9:51 AMS241,001 mi
13
7%3:46 AMENE5:26 PMWNW-10:39 AMS237,642 mi
14
3%4:53 AME5:57 PMW-11:27 AMS234,411 mi
15
0%6:01 AME6:28 PMW-12:17 PMS231,576 mi
16
1%7:12 AME7:00 PMW-1:07 PMS229,362 mi
17
4%8:24 AMESE7:35 PMWSW-2:00 PMS227,918 mi
18
10%9:37 AMESE8:13 PMWSW-2:55 PMS227,297 mi
19
18%10:49 AMESE8:57 PMWSW-3:53 PMS227,461 mi
20
29%11:59 AMESE9:47 PMWSW-4:53 PMS228,294 mi
21
40%1:03 PMESE10:44 PMWSW-5:54 PMS229,640 mi
22
50%2:00 PMESE11:47 PMWSW-6:53 PMS231,341 mi
23
64%2:50 PMESE--7:51 PMS233,261 mi
24
74%-12:52 AMWSW3:32 PMESE8:45 PMS235,304 mi
25
83%-1:59 AMWSW4:08 PMESE9:36 PMS237,414 mi
26
91%-3:06 AMWSW4:40 PME10:25 PMS239,563 mi
27
96%-4:11 AMW5:10 PME11:11 PMS241,728 mi
28
99%-5:15 AMW5:38 PME11:56 PMS243,880 mi
29
100%-6:18 AMW6:05 PME--
30
100%-7:19 AMW6:34 PMENE12:40 AMS245,966 mi

Humidity Comfort Levels in September 2012 in Chicago

Humidity Comfort Levels in September 2012 in Chicago1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The hourly reported humidity comfort level, categorized by dew point. The shaded overlays indicate night and civil twilight.

Wind Speed in September 2012 in Chicago

Wind Speed in September 2012 in Chicago181522291122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph10 mph10 mph20 mph20 mph30 mph30 mph40 mph40 mph50 mph50 mphAugOct
The daily range of reported wind speeds (gray bars), with maximum gust speeds (red ticks).

Hourly Wind Speed in September 2012 in Chicago

Hourly Wind Speed in September 2012 in Chicago1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
0 mph calm 1 mph light air 4 mph light breeze 8 mph gentle breeze 13 mph moderate breeze 18 mph fresh breeze 25 mph strong breeze 31 mph near gale 39 mph gale 47 mph strong gale 55 mph storm 64 mph violent storm 73 mph hurricane force
The hourly reported wind speed, color coded into bands according to the Beaufort scale. The shaded overlays indicate night and civil twilight.

Hourly Wind Direction in 2012 in Chicago

Hourly Wind Direction in 2012 in Chicago1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM3 AM3 AM6 AM6 AM9 AM9 AM12 PM12 PM3 PM3 PM6 PM6 PM9 PM9 PM12 AM12 AMAugOct
calmnortheastsouthwest
The hourly reported wind direction, color coded by compass point. The shaded overlays indicate night and civil twilight.

Atmospheric Pressure in September 2012 in Chicago

Atmospheric Pressure in September 2012 in Chicago1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303029.7 inHg29.7 inHg29.8 inHg29.8 inHg29.9 inHg29.9 inHg30.0 inHg30.0 inHg30.1 inHg30.1 inHg30.2 inHg30.2 inHg30.3 inHg30.3 inHg30.4 inHg30.4 inHgAugOct
The daily range of atmospheric pressure (gray bars), as measured by the altimeter setting reported in e.g. a METAR report.

The details of the data sources used for this report can be found on the Chicago Midway International Airport page.

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