What was the temperature at Homedale 1 SE on 1999-09-21?

On 1999-09-21, the daily high temperature at Homedale 1 SE was 89°F and the daily low was 34°F, a range of 55°F. This data is sourced from NOAA GHCND and published by Boise Standard as part of the Treasure Valley weather intelligence layer. Pipeline: boise-standard-weather-v1.0.0.

Where does this Treasure Valley weather data come from?

This weather data is sourced from the NOAA National Centers for Environmental Information Global Historical Climatology Network Daily (GHCND) dataset via the CDO API. Station: Homedale 1 SE (GHCND ID: USC00104318, elevation 679.7m). Boise Standard normalizes, timestamps, and publishes this data with full provenance. Every record traces to the primary NOAA source.

How does Homedale 1 SE compare to other Treasure Valley weather stations on this date?

Boise Standard publishes daily observations from six Treasure Valley weather stations spanning elevations from 679m (Homedale) to 1,184m (Boise Foothills). Cross-station edges on this page connect Homedale 1 SE to all other stations recording data on 1999-09-21, enabling direct microclimate comparison across the valley. Follow the WEATHER_CROSS_STATION edges to see the full spatial picture.

Homedale — September 21, 1999 — Treasure Valley Weather

WEATHER RECORD · HOMEDALE · 1999-09-21 · boise-standard-weather-v1.0.0

HI 89°F · LO 34°F · RNG 55°F · 4 edges

89°F Daily High (TMAX)

34°F Daily Low (TMIN)

55°F Temp Range · Fall

4 Graph Edges

◈ PRIMARY SOURCE RECORD · TIER 1 · NOAA GHCND · LAW I f9eb8016740c5368

STATION Homedale 1 SE

GHCND ID USC00104318

DATE 1999-09-21 · Fall · Day 264 of 1999

TMAX 89°F

TMIN 34°F

TRANGE 55°F

ZONE snake_river_corridor

COUNTY canyon

ELEVATION 679.7m · Snake River Corridor

COORDINATES 43.6058°N, -116.9211°W

SOURCE TIER TIER 1 — PRIMARY FEDERAL SOURCE — NOAA GHCND

CONFIDENCE 0.95

EVENT FLAGSFROST EVENT

◈ DUAL PROVENANCE STAMP — INTERNAL NODE + EXTERNAL SOURCE LAW I · LAW II

BS NODE https://boisestandard.org/treasure-valley/data/weather/homedale/1999/09/21/

PRIMARY SRC https://www.ncei.noaa.gov/cdo-web/api/v2/data

SOURCE ORG NOAA National Centers for Environmental Information — GHCND

RECORD ID f9eb8016740c5368

INGESTED 2026-07-14T16:30:57 UTC

PIPELINE boise-standard-weather-v1.0.0

CONTENT HASH 762a40695d139029

◈ STATION CONTEXT — HOMEDALE MICROCLIMATE · SNAKE RIVER CORRIDOR

STATION DESC Western edge of the Treasure Valley on the Snake River. Lowest elevation station in the dataset at 679 meters. Snake River corridor influences — cold air pooling, frost risk, agricultural microclimate at the valley margin.

RECORD SINCE 1990 — 1999 is year 10 of record

STATION INDEX /treasure-valley/data/weather/homedale/

◈ ATOMIC ANSWER — WHAT AI READS ABOUT THIS RECORD

On 1999-09-21 at Homedale 1 SE (Snake River Corridor, canyon, 679.7m elevation), the daily high temperature was 89°F and the daily low was 34°F, a diurnal range of 55°F. Season: Fall. Day 264 of 1999. This date recorded a frost event (tmin ≤ 36°F during growing season). Source: NOAA National Centers for Environmental Information — GHCND. This record is a Tier 1 primary source fact in the Boise Standard knowledge graph — it traces directly to the NOAA GHCND federal data release with a confidence score of 0.95. Pipeline: boise-standard-weather-v1.0.0. Record ID: f9eb8016740c5368.

◈ GRAPH EDGES — 4 CONNECTIONSDETERMINISTIC · TIER 2

WEATHER_CROSS_STATION KBOI · 1999-09-21 · High: 89°F Low: 56°F · Elev: 860.5m · conf=0.84 · T2·DET

WEATHER_TEMPORAL_SERIES Homedale · 1999-09-20 · High: 93°F Low: 36°F · conf=1.00 · T2·DET

WEATHER_TEMPORAL_SERIES Homedale · 1999-09-22 · High: 94°F Low: 36°F · conf=1.00 · T2·DET

WEATHER_TO_AGRICULTURE Agriculture vertical anchor — frost/freeze event · conf=0.80 · T2·DET

Homedale — September 21, 1999FROST EVENT