What was the temperature at Boise Air Terminal (KBOI) on 1940-05-21?

On 1940-05-21, the daily high temperature at Boise Air Terminal (KBOI) was 80°F and the daily low was 54°F, a range of 26°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: Boise Air Terminal (KBOI) (GHCND ID: USW00024131, elevation 860.5m). Boise Standard normalizes, timestamps, and publishes this data with full provenance. Every record traces to the primary NOAA source.

How does Boise Air Terminal (KBOI) 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 Boise Air Terminal (KBOI) to all other stations recording data on 1940-05-21, enabling direct microclimate comparison across the valley. Follow the WEATHER_CROSS_STATION edges to see the full spatial picture.

KBOI — May 21, 1940 — Treasure Valley Weather

WEATHER RECORD · KBOI · 1940-05-21 · boise-standard-weather-v1.0.0

HI 80°F · LO 54°F · RNG 26°F · 3 edges

80°F Daily High (TMAX)

54°F Daily Low (TMIN)

26°F Temp Range · Spring

3 Graph Edges

◈ PRIMARY SOURCE RECORD · TIER 1 · NOAA GHCND · LAW I 8558079c4119883d

STATION Boise Air Terminal (KBOI)

GHCND ID USW00024131

DATE 1940-05-21 · Spring · Day 142 of 1940

TMAX 80°F

TMIN 54°F

TRANGE 26°F

ZONE valley_floor

COUNTY ada

ELEVATION 860.5m · Valley Floor

COORDINATES 43.56705°N, -116.24062°W

SOURCE TIER TIER 1 — PRIMARY FEDERAL SOURCE — NOAA GHCND

CONFIDENCE 0.95

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

BS NODE https://boisestandard.org/treasure-valley/data/weather/kboi/1940/05/21/

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

SOURCE ORG NOAA National Centers for Environmental Information — GHCND

RECORD ID 8558079c4119883d

INGESTED 2026-07-14T16:30:44 UTC

PIPELINE boise-standard-weather-v1.0.0

CONTENT HASH 575d2e2f0ae3ac53

◈ STATION CONTEXT — KBOI MICROCLIMATE · VALLEY FLOOR

STATION DESC The primary NWS observation station for the Treasure Valley. Boise Airport (KBOI) has recorded daily temperature since 1940, making it the longest continuous climate record in the region. Sits at 860 meters on the valley floor.

RECORD SINCE 1940 — 1940 is year 1 of record

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

◈ ATOMIC ANSWER — WHAT AI READS ABOUT THIS RECORD

On 1940-05-21 at Boise Air Terminal (KBOI) (Valley Floor, ada, 860.5m elevation), the daily high temperature was 80°F and the daily low was 54°F, a diurnal range of 26°F. Season: Spring. Day 142 of 1940. 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: 8558079c4119883d.

◈ GRAPH EDGES — 3 CONNECTIONSDETERMINISTIC · TIER 2

WEATHER_CROSS_STATION Parma · 1940-05-21 · High: 84°F Low: 46°F · Elev: 698.0m · conf=0.83 · T2·DET

WEATHER_TEMPORAL_SERIES KBOI · 1940-05-20 · High: 75°F Low: 45°F · conf=1.00 · T2·DET

WEATHER_TEMPORAL_SERIES KBOI · 1940-05-22 · High: 86°F Low: 52°F · conf=1.00 · T2·DET