Viewing Station: IL-WL-137 : Naperville 2.8 SSW
May 8, 2017 - May 27, 20263,085 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 1.76"
May 1-27, 2026(27 of 27 days covered by obs)
NOAA Normal
3.96"
Departure from Normal
-2.20" : 44% of Normal
Year-To-Date: 17.09"
Jan 1 to May 27, 2026(146 of 147 days covered by obs)
NOAA Normal
13.85"
Departure from Normal
3.24" : 123% of Normal
Water Year-To-Date: 23.30"
Oct 1, 2025 to May 27, 2026(238 of 239 days covered by obs)
NOAA Normal
22.01"
Departure from Normal
1.29" : 106% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
1.97
1.96
0.01
Feb
1.76
1.83
-0.07
Mar
2.30
2.29
0.01
Apr
3.86
3.78
0.08
May
4.55
4.63
-0.08
Jun
4.43
4.36
0.07
Jul
3.93
3.93
0.00
Aug
4.01
3.86
0.15
Sep
3.20
3.21
-0.01
Oct
3.44
3.40
0.04
Nov
2.59
2.47
0.12
Dec
2.13
2.06
0.07
38.17
37.78
0.39