Big Rock climate

Big Rock Weather in August

NOAA 1991-2020 normals for Chicago Aurora Muni AP, 5.5 km from Big Rock

Average highs run from 84°F on August 1 to 80°F on August 31, and lows from 61°F to 57°F. Normal precipitation for the month is 3.35 in over about 12 wet days.

August day by day

The normal high and low for each date, and the record, in °F.

Normal daily high and low temperature at Big Rock, in °F, with the record for each date.20406080100151015202530
  • Normal low
  • Normal high
  • Record high
  • Record low

August at a glance

Average high
82°F
Average low
60°F
Precipitation
3.35 in
Record high
97°FAug 2, 2006
Record low
40°FAug 31, 2009
Chance of a freeze
0%
Days of 90°F or more
2.8
Daylight
14 h 24 min to 13 h 10 min
Cloud cover
52%
Humidity
75%
Dew point
62°F
Wind
7.6 mph

Every day of the month

A wet day has at least 0.01 inch of precipitation; snow means at least 0.1 inch of snowfall.

DateNormal highNormal lowRecord highRecord lowChance wetChance of snow
Aug 184°F61°F96°F 200650°F 201936%0%
Aug 284°F61°F97°F 200648°F 200937%0%
Aug 383°F61°F94°F 201252°F 199937%0%
Aug 483°F61°F93°F 201249°F 202037%0%
Aug 583°F61°F92°F 201845°F 202037%0%
Aug 683°F61°F92°F 202247°F 200437%0%
Aug 783°F61°F94°F 200148°F 200437%0%
Aug 883°F61°F91°F 200548°F 201737%0%
Aug 983°F61°F95°F 200547°F 199937%0%
Aug 1083°F61°F91°F 201648°F 202438%0%
Aug 1183°F61°F93°F 201645°F 200438%0%
Aug 1283°F60°F91°F 201045°F 200438%0%
Aug 1383°F60°F90°F 201044°F 200438%0%
Aug 1483°F60°F90°F 202044°F 200138%0%
Aug 1582°F60°F92°F 202541°F 200438%0%
Aug 1682°F60°F94°F 202545°F 200438%0%
Aug 1782°F60°F88°F 202548°F 201239%0%
Aug 1882°F60°F90°F 202547°F 201239%0%
Aug 1982°F59°F89°F 202150°F 202039%0%
Aug 2082°F59°F92°F 201049°F 200139%0%
Aug 2182°F59°F95°F 200346°F 200439%0%
Aug 2282°F59°F89°F 200745°F 200439%0%
Aug 2382°F59°F94°F 202349°F 201839%0%
Aug 2481°F58°F96°F 202349°F 200539%0%
Aug 2581°F58°F94°F 200343°F 201739%0%
Aug 2681°F58°F93°F 200344°F 202539%0%
Aug 2781°F58°F96°F 202446°F 201539%0%
Aug 2881°F57°F94°F 200348°F 202339%0%
Aug 2981°F57°F93°F 201048°F 200138%0%
Aug 3081°F57°F93°F 201343°F 200938%0%
Aug 3180°F57°F93°F 200040°F 200938%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Big Rock, in percent, and of at least 0.1 inch of snowfall.0102030401102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

August 1
sunrise 5:48 AM, sunset 8:12 PM
August 31
sunrise 6:19 AM, sunset 7:29 PM

Every day of August: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USW00004808 (Chicago Aurora Muni AP), public domain. Records: NOAA GHCN-Daily, station USW00004808, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.