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Annual Summary · Boise River Basin · NOAA GHCND

Arrowrock Dam — 1999

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

65°F
Avg High
40°F
Avg Low
101°F
Year Max
12°F
Year Min
◈ Monthly Breakdown — 1999
January
Avg Hi: 39°F Avg Lo: 25°F 23 days
February
Avg Hi: 41°F Avg Lo: 24°F 28 days
March
Avg Hi: 53°F Avg Lo: 35°F 31 days
April
Avg Hi: 66°F Avg Lo: 46°F 30 days
May
Avg Hi: 73°F Avg Lo: 49°F 31 days
June
Avg Hi: 77°F Avg Lo: 48°F 24 days
July
Avg Hi: 89°F Avg Lo: 52°F 30 days
August
Avg Hi: 91°F Avg Lo: 57°F 30 days
September
Avg Hi: 79°F Avg Lo: 44°F 30 days
October
Avg Hi: 69°F Avg Lo: 38°F 31 days
November
Avg Hi: 54°F Avg Lo: 33°F 29 days
December
Avg Hi: 35°F Avg Lo: 25°F 27 days
◈ Source Record
Station
Arrowrock Dam · USC00100448
Year
1999 · 344 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↗