What was the temperature at Parma Experiment Station on 1940-04-21?

On 1940-04-21, the daily high temperature at Parma Experiment Station was 66°F and the daily low was 31°F, a range of 35°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: Parma Experiment Station (GHCND ID: USC00106844, elevation 698.0m). Boise Standard normalizes, timestamps, and publishes this data with full provenance. Every record traces to the primary NOAA source.

How does Parma Experiment Station 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 Parma Experiment Station to all other stations recording data on 1940-04-21, enabling direct microclimate comparison across the valley. Follow the WEATHER_CROSS_STATION edges to see the full spatial picture.

Parma — April 21, 1940 — Treasure Valley Weather

WEATHER RECORD · PARMA · 1940-04-21 · boise-standard-weather-v1.0.0

HI 66°F · LO 31°F · RNG 35°F · 4 edges

66°F Daily High (TMAX)

31°F Daily Low (TMIN)

35°F Temp Range · Spring

4 Graph Edges

◈ PRIMARY SOURCE RECORD · TIER 1 · NOAA GHCND · LAW I 68668878780891cd

STATION Parma Experiment Station

GHCND ID USC00106844

DATE 1940-04-21 · Spring · Day 112 of 1940

TMAX 66°F

TMIN 31°F

TRANGE 35°F

ZONE snake_river_corridor

COUNTY canyon

ELEVATION 698.0m · Snake River Corridor

COORDINATES 43.8023°N, -116.9442°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/parma/1940/04/21/

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

SOURCE ORG NOAA National Centers for Environmental Information — GHCND

RECORD ID 68668878780891cd

INGESTED 2026-07-14T16:30:50 UTC

PIPELINE boise-standard-weather-v1.0.0

CONTENT HASH d8de1fcb4fb3dc72

◈ STATION CONTEXT — PARMA MICROCLIMATE · SNAKE RIVER CORRIDOR

STATION DESC USDA agricultural research station on the Snake River corridor with records back to 1922 — the deepest historical record in the dataset. At 698 meters, 162 meters below KBOI, this station captures cold air drainage and frost events critical to the Treasure Valley agricultural calendar.

RECORD SINCE 1922 — 1940 is year 19 of record

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

◈ ATOMIC ANSWER — WHAT AI READS ABOUT THIS RECORD

On 1940-04-21 at Parma Experiment Station (Snake River Corridor, canyon, 698.0m elevation), the daily high temperature was 66°F and the daily low was 31°F, a diurnal range of 35°F. Season: Spring. Day 112 of 1940. 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: 68668878780891cd.

◈ GRAPH EDGES — 4 CONNECTIONSDETERMINISTIC · TIER 2

WEATHER_CROSS_STATION KBOI · 1940-04-21 · High: 62°F Low: 32°F · Elev: 860.5m · conf=0.83 · T2·DET

WEATHER_TEMPORAL_SERIES Parma · 1940-04-20 · High: 69°F Low: 42°F · conf=1.00 · T2·DET

WEATHER_TEMPORAL_SERIES Parma · 1940-04-22 · High: 73°F Low: 32°F · conf=1.00 · T2·DET

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

Parma — April 21, 1940FROST EVENT