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Annual Summary · Boise River Basin · NOAA GHCND

Arrowrock Dam — 1986

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

63°F
Avg High
38°F
Avg Low
103°F
Year Max
5°F
Year Min
◈ Monthly Breakdown — 1986
January
Avg Hi: 38°F Avg Lo: 21°F 31 days
February
Avg Hi: 43°F Avg Lo: 27°F 24 days
March
Avg Hi: 57°F Avg Lo: 33°F 24 days
April
Avg Hi: 58°F Avg Lo: 34°F 26 days
May
Avg Hi: 70°F Avg Lo: 42°F 29 days
June
Avg Hi: 87°F Avg Lo: 54°F 30 days
July
Avg Hi: 84°F Avg Lo: 53°F 29 days
August
Avg Hi: 93°F Avg Lo: 58°F 30 days
September
Avg Hi: 68°F Avg Lo: 44°F 28 days
October
Avg Hi: 64°F Avg Lo: 37°F 28 days
November
Avg Hi: 46°F Avg Lo: 30°F 19 days
December
Avg Hi: 36°F Avg Lo: 20°F 26 days
◈ Source Record
Station
Arrowrock Dam · USC00100448
Year
1986 · 324 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
◈ Provenance · Sources · Knowledge Graph Context
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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↗