Lyman County, South Dakota · Frost dates
Lyman County frost dates.
First-frost, last-frost, and growing-season length for Lyman County, South Dakota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4b
32°F — light freeze
Last spring frost
- 10%
- 05-26
- 20%
- 05-21
- 50%
- 05-12
- 80%
- 05-04
- 90%
- 04-29
First fall frost
- 10%
- 09-15
- 20%
- 09-19
- 50%
- 09-28
- 80%
- 10-06
- 90%
- 10-10
28°F — killing freeze
Last spring freeze
- 10%
- 05-17
- 20%
- 05-12
- 50%
- 05-03
- 80%
- 04-24
- 90%
- 04-19
First fall freeze
- 10%
- 09-21
- 20%
- 09-27
- 50%
- 10-05
- 80%
- 10-14
- 90%
- 10-18
Growing season length (days, 28°F threshold)
- Short year
- 127
- Median
- 155
- Long year
- 182
Source NOAA station
KENNEBEC, SD US
1.0 mi · 30 yrs of record (1991–2020) · 1681 ft elev.
Data from KENNEBEC, SD US, 1 miles away with 30-year NOAA record (1991-2020).
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