Northern Pacific Reservoir Rainfall Forecast

Today 31 May
100%
Mon 1 Jun
85%
Tue 2 Jun
40%
Wed 3 Jun
20%
Thu 4 Jun
55%
Fri 5 Jun
25%
Sat 6 Jun
25%

Northern Pacific Reservoir Rainfall Statistics

May Rainfall

Helena Regional Airport (5 miles)

Total Rainfall 2026
4in
Daily Average 2026
0.03in
Wettest Day 9 February, 2026
0.6in
Wet Days 2026
32/151 (21%)
Total Rainfall April
1.4in
Daily Average April
0.05in
Wettest Day 11 April, 2026
0.5in
Wet Days April
8/31 (26%)
Total Rainfall May
0.6in
Daily Average May
0.02in
Wettest Day 29 May, 2026
0.2in
Wet Days May
8/31 (26%)

Climate (2010–Present)

Helena Regional Airport (5 miles)

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Annual Average 2021–2025
11.3in
Monthly Average 2021–2026
1in
Daily Average 2021–2026
0.03in
Wettest Day 22 September, 2023
1.3in

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