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Annual Summary · Boise River Basin · NOAA GHCND

Arrowrock Dam — 1991

Arrowrock Dam · 3,241 ft · Boise County, Idaho

62°F
Avg High
36°F
Avg Low
103°F
Year Max
-1°F
Year Min
◈ Monthly Breakdown — 1991
January
Avg Hi: 32°F Avg Lo: 15°F 31 days
February
Avg Hi: 50°F Avg Lo: 26°F 28 days
March
Avg Hi: 50°F Avg Lo: 29°F 31 days
April
Avg Hi: 57°F Avg Lo: 33°F 30 days
May
Avg Hi: 65°F Avg Lo: 38°F 31 days
June
Avg Hi: 77°F Avg Lo: 44°F 30 days
July
Avg Hi: 92°F Avg Lo: 53°F 31 days
August
Avg Hi: 92°F Avg Lo: 55°F 31 days
September
Avg Hi: 79°F Avg Lo: 46°F 30 days
October
Avg Hi: 64°F Avg Lo: 35°F 31 days
November
Avg Hi: 42°F Avg Lo: 28°F 30 days
December
Avg Hi: 38°F Avg Lo: 22°F 31 days
◈ Source Record
Station
Arrowrock Dam · USC00100448
Year
1991 · 365 days of records
Elevation
3,241 ft · 988m
Source
NOAA GHCND — CDO API ↗
Pipeline
idahocity-weather-v2.0.0 · 2026-07-25
← All Years ← All Stations
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Authoritative Sources
🌦️NOAA GHCND — Climate Data Online↗ ◈Boise Standard · Idaho City↗ 🏛️Boise County Official↗ 🤝Idaho City Chamber of Commerce↗ 🗺️Visit Southwest Idaho↗ 📊U.S. Census · Idaho City↗ 📚Britannica · Idaho City↗ 🏺Idaho City Historical Foundation↗
Wikipedia · Geographic Context
🏙️Idaho City, Idaho↗ 📍Boise County, Idaho↗ 🌿Garden Valley, Idaho↗ 🌲Lowman, Idaho↗ 🏔️Boise, Idaho↗
Wikipedia · Region & Federal Land
🌲Boise National Forest↗ 🛣️Ponderosa Pine Scenic Byway↗ 🏕️Frank Church Wilderness↗ ⛰️Sawtooth National Forest↗ 🏞️South Fork Payette River↗