Viewing Station: OR-MT-99 : Portland 5.8 S
May 11, 2017 - Sep 16, 20252,129 Total Observations
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Climatology

Precipitation Normals Comparison

Month-To-Date: 0.86"
September 1-17, 2025(14 of 17 days covered by obs)
NOAA Normal
0.90"
Departure from Normal
-0.04" : 96% of Normal
Year-To-Date: 22.19"
Jan 1 to Sep 17, 2025(252 of 260 days covered by obs)
NOAA Normal
25.09"
Departure from Normal
-2.90" : 88% of Normal
Water Year-To-Date: 39.88"
Oct 1, 2024 to Sep 17, 2025(344 of 352 days covered by obs)
NOAA Normal
42.97"
Departure from Normal
-3.09" : 93% of Normal
MonthNOAA Normals (in)PRISM Normals (in)Diff (in)
Jan
6.23
6.43
-0.20
Feb
4.56
4.81
-0.25
Mar
4.67
5.17
-0.50
Apr
3.54
3.81
-0.27
May
2.56
2.63
-0.07
Jun
1.63
1.70
-0.07
Jul
0.43
0.42
0.01
Aug
0.57
0.56
0.01
Sep
1.58
1.60
-0.02
Oct
4.01
4.11
-0.10
Nov
6.59
6.66
-0.07
Dec
7.28
7.47
-0.19
43.65
45.37
-1.72