What was the temperature at Arrowrock Dam on 1977-09-21?

On 1977-09-21, the daily high at Arrowrock Dam (Boise River Basin, 3,241 ft, Boise County, Idaho) was 57°F and the daily low was 36°F. Source: NOAA GHCND. Pipeline: idahocity-weather-v2.0.0.

Arrowrock Dam Weather — September 21, 1977

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

On 1977-09-21 at Arrowrock Dam (Boise River Basin, 3,241 ft elevation, Boise County, Idaho), the daily high temperature was 57°F and the daily low was 36°F, a diurnal range of 21°F. Season: Fall. Day 264 of 1977. This date recorded a frost event (low ≤ 36°F) during the growing season.

Source: NOAA National Centers for Environmental Information — GHCND · Record ID: 84ca36578829befd · Hash: 4080b672997bab1f

57°F

Daily High (TMAX)

36°F

Daily Low (TMIN)

21°F

Temp Range

Graph Edges

◈ Primary Source Record · NOAA GHCND · Tier 1

Station

Arrowrock Dam

GHCND ID

USC00100448

Date

1977-09-21 · Fall · Day 264 of 1977

High (TMAX)

57°F

Low (TMIN)

36°F

Range

21°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

84ca36578829befd

Content Hash

4080b672997bab1f

Ingested

2026-07-25T14:45:12 UTC

Pipeline

idahocity-weather-v2.0.0

◈ Graph Edges — 3 Connections · Tier 2 · Deterministic

WEATHER_CROSS_STATION

1977-09-21 | KBOI(860.5m) → USC00100448(988.0m) | Δelev=128m

conf=0.81 · tier-2 · deterministic

WEATHER_TEMPORAL_SERIES

Arrowrock Dam · 1977-09-20 · Hi:70°F Lo:45°F

conf=1.00 · tier-2 · deterministic

WEATHER_TEMPORAL_SERIES

Arrowrock Dam · 1977-09-22 · Hi:62°F Lo:31°F

conf=1.00 · tier-2 · deterministic

Arrowrock Dam — September 21, 1977FROST EVENT