Yukon-Koyukuk Census Area, Alaska · Frost dates
Yukon-Koyukuk Census Area frost dates.
First-frost, last-frost, and growing-season length for Yukon-Koyukuk Census Area, Alaska. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 06-16
- 20%
- 06-07
- 50%
- 05-29
- 80%
- 05-19
- 90%
- 05-15
First fall frost
- 10%
- 08-10
- 20%
- 08-17
- 50%
- 08-28
- 80%
- 09-05
- 90%
- 09-09
28°F — killing freeze
Last spring freeze
- 10%
- 05-30
- 20%
- 05-26
- 50%
- 05-16
- 80%
- 05-09
- 90%
- 05-05
First fall freeze
- 10%
- 08-25
- 20%
- 08-31
- 50%
- 09-08
- 80%
- 09-20
- 90%
- 09-25
Growing season length (days, 28°F threshold)
- Short year
- 87
- Median
- 115
- Long year
- 143
Source NOAA station
TANANA CALHOUN MEM AP, AK US
20.7 mi · 30 yrs of record (1991–2020) · 227 ft elev.
Data from TANANA CALHOUN MEM AP, AK US, 20.7 miles away with 30-year NOAA record (1991-2020).
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