Northern Pacific Reservoir Rainfall Forecast

Today 27 Nov
65%
Fri 28 Nov
95%
Sat 29 Nov
5%
Sun 30 Nov
No Rain
Mon 1 Dec
35%
Tue 2 Dec
65%
Wed 3 Dec
20%

Northern Pacific Reservoir Rainfall Statistics

November Rainfall

Helena Regional Airport (5 miles)

Total Rainfall 2025
12.9in
Daily Average 2025
0.04in
Wettest Day 14 May, 2025
1in
Wet Days 2025
95/331 (29%)
Total Rainfall October
1.4in
Daily Average October
0.05in
Wettest Day 12 October, 2025
0.5in
Wet Days October
12/31 (39%)
Total Rainfall November
0.2in
Daily Average November
0.01in
Wettest Day 14 November, 2025
0.2in
Wet Days November
4/27 (15%)

Climate (2010–Present)

Helena Regional Airport (5 miles)

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Annual Average 2020–2024
10.5in
Monthly Average 2020–2025
0.9in
Daily Average 2020–2025
0.03in
Wettest Day 22 September, 2023
1.3in

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