Frost Dates for 46122 — Danville, Indiana

Half of springs at Jamestown 2 E, IN see their last 32°F night by April 23; only one in ten is past it by April 8, and one in ten still has one after May 9. Planting tender crops after April 29 leaves a 30% risk of a frost on them, after May 2 20%, and after May 9 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 35% of the 125 Indiana stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 19 in half of years, as early as October 4 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 13 days later, around November 1; in spring the one-in-ten date for 28°F is April 28, 11 days before the 32°F one. The freeze-free season lasts 178 days in a typical year, shorter than at 62% of the 125 Indiana stations; it reaches 198 days one year in ten and falls short of 155 one year in ten. On average 127 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 10 days longer, to about May 3, and return around October 9. Severe cold of 16°F or below comes every winter, usually between December 1 and March 9.

July is the warmest month at Jamestown 2 E, IN, averaging 83°F by day and 63°F at night; January is the coldest at 34°F and 18°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 26% of years.

Warmth for growing adds up to 3,243 growing degree days a year (base 50°F), fewer than at 61% of the 125 Indiana stations. 36% of them (1,161) have built up by the end of June, and July adds the most, 711. Precipitation totals 43.3 inches a year, most in June (5.2") and least in February (2.4"); May to September bring 49% of it.

The nearest other station, Indianapolis Eagle Creek Airport, IN, 13 miles east of Danville, has a last frost 11 days earlier (April 12), a first frost 10 days later (October 29), a season 20 days longer.

The first measurable snow (0.1 inch or more) in Danville usually arrives around December 7, and the last of the season around March 15. Those are the middle dates across the winters of 1991–2020 at Danville 3 SW, IN, 2 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 39 days after the last snow.

ZIP 46122 is 12 miles from Jamestown 2 E, IN, which stands at 962 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 46122 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.