Crystal Lawns climate

Crystal Lawns Weather in May

NOAA 1991-2020 normals for Romeoville WFO, 7.2 km from Crystal Lawns

Average highs run from 67°F on May 1 to 78°F on May 31, and lows from 45°F to 56°F. Normal precipitation for the month is 4.81 in over about 14 wet days.

May day by day

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

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

May at a glance

Average high
72°F
Average low
50°F
Precipitation
4.81 in
Record high
95°FMay 28, 2012
Record low
28°FMay 10, 2020
Chance of a freeze
21%
Days of 90°F or more
1.0
Daylight
14 h 02 min to 14 h 59 min
Cloud cover
66%
Humidity
76%
Dew point
52°F
Wind
10.7 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
May 167°F45°F85°F 200130°F 197844%
May 267°F45°F87°F 199230°F 197844%
May 368°F46°F85°F 201830°F 200544%
May 468°F46°F85°F 200130°F 200544%
May 569°F46°F86°F 198035°F 200544%
May 669°F47°F88°F 198032°F 198944%
May 769°F47°F86°F 200430°F 198944%
May 870°F48°F85°F 198831°F 198944%
May 970°F48°F89°F 201430°F 202044%
May 1070°F48°F87°F 197928°F 202044%
May 1171°F49°F90°F 201133°F 202144%
May 1271°F49°F92°F 202230°F 198144%
May 1371°F49°F90°F 202233°F 202144%
May 1472°F50°F89°F 202235°F 200244%
May 1572°F50°F91°F 201336°F 201644%
May 1673°F50°F93°F 202535°F 199744%
May 1773°F51°F92°F 200136°F 199744%0%
May 1873°F51°F92°F 200135°F 200244%0%
May 1974°F51°F92°F 200134°F 200243%0%
May 2074°F52°F91°F 197739°F 198143%0%
May 2174°F52°F91°F 199833°F 200243%0%
May 2275°F52°F90°F 198734°F 200243%0%
May 2375°F53°F88°F 197742°F 200643%0%
May 2475°F53°F89°F 201040°F 199243%0%
May 2576°F54°F92°F 202137°F 199243%0%
May 2676°F54°F88°F 197734°F 197943%0%
May 2776°F54°F92°F 198535°F 199242%0%
May 2877°F55°F95°F 201237°F 199242%0%
May 2977°F55°F94°F 201838°F 199242%0%
May 3077°F55°F93°F 200639°F 198442%0%
May 3178°F56°F93°F 200640°F 202142%0%

Chance of rain

The chance of at least 0.01 inch of precipitation on each date at Crystal Lawns, in percent, and of at least 0.1 inch of snowfall.010203040501102030
  • Chance of a wet day
  • Chance of snowfall

Sunrise and sunset

Times for 2026, local time (CDT).

May 1
sunrise 5:49 AM, sunset 7:51 PM
May 31
sunrise 5:21 AM, sunset 8:20 PM

Every day of May: sun and moon

Other months

Sources

Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00117457 (Romeoville WFO), public domain. Records: NOAA GHCN-Daily, station USC00114530, 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.