Viewing Station: IL-WL-166 : Naperville 3.6 SE
Jul 1, 2020 - May 15, 20261,866 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 1.52"
May 1-16, 2026(15 of 16 days covered by obs)
NOAA Normal
2.35"
Departure from Normal
-0.83" : 65% of Normal
Year-To-Date: 13.17"
Jan 1 to May 16, 2026(134 of 136 days covered by obs)
NOAA Normal
12.44"
Departure from Normal
0.73" : 106% of Normal
Water Year-To-Date: 20.16"
Oct 1, 2025 to May 16, 2026(226 of 228 days covered by obs)
NOAA Normal
20.69"
Departure from Normal
-0.53" : 97% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
2.02
2.06
-0.04
Feb
1.81
1.91
-0.10
Mar
2.37
2.35
0.02
Apr
3.89
3.86
0.03
May
4.56
4.67
-0.11
Jun
4.45
4.43
0.02
Jul
3.88
3.96
-0.08
Aug
4.07
3.95
0.12
Sep
3.25
3.23
0.02
Oct
3.48
3.47
0.01
Nov
2.61
2.55
0.06
Dec
2.16
2.14
0.02
38.55
38.58
-0.03