Viewing Station: IL-WL-154 : Naperville 2.9 SSE
Apr 12, 2019 - May 17, 20261,656 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.70"
May 1-17, 2026(17 of 17 days covered by obs)
NOAA Normal
2.48"
Departure from Normal
-1.78" : 28% of Normal
Year-To-Date: 9.93"
Jan 1 to May 17, 2026(128 of 137 days covered by obs)
NOAA Normal
12.41"
Departure from Normal
-2.48" : 80% of Normal
Water Year-To-Date: 16.07"
Oct 1, 2025 to May 17, 2026(220 of 229 days covered by obs)
NOAA Normal
20.58"
Departure from Normal
-4.51" : 78% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
1.98
2.02
-0.04
Feb
1.78
1.88
-0.10
Mar
2.31
2.33
-0.02
Apr
3.86
3.83
0.03
May
4.53
4.66
-0.13
Jun
4.42
4.40
0.02
Jul
3.90
3.95
-0.05
Aug
4.05
3.91
0.14
Sep
3.20
3.22
-0.02
Oct
3.43
3.44
-0.01
Nov
2.60
2.52
0.08
Dec
2.14
2.11
0.03
38.20
38.27
-0.07