What was the temperature at Arrowrock Dam on 1987-10-21?

On 1987-10-21, the daily high at Arrowrock Dam (Boise River Basin, 3,241 ft, Boise County, Idaho) was 63°F and the daily low was 29°F. Source: NOAA GHCND. Pipeline: idahocity-weather-v2.0.0.

Arrowrock Dam Weather — October 21, 1987

◈ Atomic Answer · NOAA GHCND · Tier 1 Primary Source · idahocity-weather-v2.0.0

On 1987-10-21 at Arrowrock Dam (Boise River Basin, 3,241 ft elevation, Boise County, Idaho), the daily high temperature was 63°F and the daily low was 29°F, a diurnal range of 34°F. Season: Fall. Day 294 of 1987. This date recorded a frost event (low ≤ 36°F) during the growing season.

Source: NOAA National Centers for Environmental Information — GHCND · Record ID: 414941548e3e962e · Hash: 62fcb97dc80469f5

63°F

Daily High (TMAX)

29°F

Daily Low (TMIN)

34°F

Temp Range

Graph Edges

◈ Primary Source Record · NOAA GHCND · Tier 1

Station

Arrowrock Dam

GHCND ID

USC00100448

Date

1987-10-21 · Fall · Day 294 of 1987

High (TMAX)

63°F

Low (TMIN)

29°F

Range

34°F

Zone

Boise River Basin

Elevation

3,241 ft · 988 m

Coordinates

43.6°N, 115.9167°W

Geography

boise_county

Source Tier

Tier 1 — Primary Federal Source — NOAA GHCND

Confidence

0.95

Record ID

414941548e3e962e

Content Hash

62fcb97dc80469f5

Ingested

2026-07-25T14:45:12 UTC

Pipeline

idahocity-weather-v2.0.0

◈ Graph Edges — 3 Connections · Tier 2 · Deterministic

WEATHER_CROSS_STATION

1987-10-21 | KBOI(860.5m) → USC00100448(988.0m) | Δelev=128m

conf=0.81 · tier-2 · deterministic

WEATHER_TEMPORAL_SERIES

Arrowrock Dam · 1987-10-20 · Hi:59°F Lo:29°F

conf=1.00 · tier-2 · deterministic

WEATHER_TEMPORAL_SERIES

Arrowrock Dam · 1987-10-22 · Hi:66°F Lo:30°F

conf=1.00 · tier-2 · deterministic

Arrowrock Dam — October 21, 1987FROST EVENT