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Annual Summary · Boise River Basin · NOAA GHCND

Arrowrock Dam — 1976

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

57°F
Avg High
33°F
Avg Low
100°F
Year Max
1°F
Year Min
◈ Monthly Breakdown — 1976
January
Avg Hi: 32°F Avg Lo: 19°F 31 days
February
Avg Hi: 37°F Avg Lo: 19°F 29 days
March
Avg Hi: 41°F Avg Lo: 21°F 31 days
April
Avg Hi: 56°F Avg Lo: 32°F 30 days
May
Avg Hi: 72°F Avg Lo: 43°F 31 days
June
Avg Hi: 75°F Avg Lo: 46°F 30 days
July
Avg Hi: 88°F Avg Lo: 57°F 31 days
September
Avg Hi: 76°F Avg Lo: 46°F 30 days
October
Avg Hi: 63°F Avg Lo: 34°F 31 days
November
Avg Hi: 50°F Avg Lo: 27°F 30 days
December
Avg Hi: 38°F Avg Lo: 19°F 31 days
◈ Source Record
Station
Arrowrock Dam · USC00100448
Year
1976 · 335 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↗