What was the temperature at Boise 7 N (Foothills) on 1991-05-21?

On 1991-05-21, the daily high temperature at Boise 7 N (Foothills) was 70°F and the daily low was 40°F, a range of 30°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 7 N (Foothills) (GHCND ID: USC00101017, elevation 1184.1m). Boise Standard normalizes, timestamps, and publishes this data with full provenance. Every record traces to the primary NOAA source.

How does Boise 7 N (Foothills) 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 7 N (Foothills) to all other stations recording data on 1991-05-21, enabling direct microclimate comparison across the valley. Follow the WEATHER_CROSS_STATION edges to see the full spatial picture.

Boise Foothills — May 21, 1991 — Treasure Valley Weather

WEATHER RECORD · BOISE FOOTHILLS · 1991-05-21 · boise-standard-weather-v1.0.0

HI 70°F · LO 40°F · RNG 30°F · 3 edges

70°F Daily High (TMAX)

40°F Daily Low (TMIN)

30°F Temp Range · Spring

3 Graph Edges

◈ PRIMARY SOURCE RECORD · TIER 1 · NOAA GHCND · LAW I 5358f8b2fa3230f7

STATION Boise 7 N (Foothills)

GHCND ID USC00101017

DATE 1991-05-21 · Spring · Day 141 of 1991

TMAX 70°F

TMIN 40°F

TRANGE 30°F

ZONE foothills_margin

COUNTY ada

ELEVATION 1184.1m · Foothills Margin

COORDINATES 43.7383°N, -116.2022°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/boise-foothills/1991/05/21/

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

SOURCE ORG NOAA National Centers for Environmental Information — GHCND

RECORD ID 5358f8b2fa3230f7

INGESTED 2026-07-14T16:30:48 UTC

PIPELINE boise-standard-weather-v1.0.0

CONTENT HASH 56c55a1e8821438d

◈ STATION CONTEXT — BOISE FOOTHILLS MICROCLIMATE · FOOTHILLS MARGIN

STATION DESC Foothills station 324 meters above KBOI. Captures the Boise Front microclimate — cooler summers, deeper inversions, earlier frost dates than the valley floor. Critical for understanding the elevation gradient across the Treasure Valley.

RECORD SINCE 1973 — 1991 is year 19 of record

STATION INDEX /treasure-valley/data/weather/boise-foothills/

◈ ATOMIC ANSWER — WHAT AI READS ABOUT THIS RECORD

On 1991-05-21 at Boise 7 N (Foothills) (Foothills Margin, ada, 1184.1m elevation), the daily high temperature was 70°F and the daily low was 40°F, a diurnal range of 30°F. Season: Spring. Day 141 of 1991. 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: 5358f8b2fa3230f7.

◈ GRAPH EDGES — 3 CONNECTIONSDETERMINISTIC · TIER 2

WEATHER_CROSS_STATION KBOI · 1991-05-21 · High: 75°F Low: 42°F · Elev: 860.5m · conf=0.91 · T2·DET

WEATHER_TEMPORAL_SERIES Boise Foothills · 1991-05-20 · High: 62°F Low: 41°F · conf=1.00 · T2·DET

WEATHER_TEMPORAL_SERIES Boise Foothills · 1991-05-22 · High: 71°F Low: 43°F · conf=1.00 · T2·DET