Frost Dates for 47527 — Dubois, Indiana

Half of springs at Dubois S In Forage Fm, IN see their last 32°F night by April 25; only one in ten is past it by April 10, and one in ten still has one after May 12. Planting tender crops after May 2 leaves a 30% risk of a frost on them, after May 6 20%, and after May 12 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 66% of the 125 Indiana stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 15 in half of years, as early as October 3 one year in ten, and holds off past October 26 one year in ten. A hard freeze of 28°F follows 10 days later, around October 25; in spring the one-in-ten date for 28°F is May 2, 10 days before the 32°F one. The freeze-free season lasts 172 days in a typical year, shorter than at 83% of the 125 Indiana stations; it reaches 190 days one year in ten and falls short of 151 one year in ten. On average 112 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 11 days longer, to about May 6, and return around October 6. Severe cold of 16°F or below comes every winter, usually between November 28 and March 11.

July is the warmest month at Dubois S In Forage Fm, IN, averaging 86°F by day and 62°F at night; January is the coldest at 40°F and 19°F. A freezing night is all but certain in every month from October 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 35% of years.

Warmth for growing adds up to 3,531 growing degree days a year (base 50°F), more than at 62% of the 125 Indiana stations. 37% of them (1,293) have built up by the end of June, and July adds the most, 752. Precipitation totals 51.7 inches a year, most in May (6.0") and least in February (3.2"); May to September bring 45% of it.

The nearest other station, Shoals 8 S, IN, 6 miles north of Dubois and 213 feet lower, has a last frost 10 days earlier (April 15), a first frost 8 days later (October 23), a season 17 days longer.

The first measurable snow (0.1 inch or more) in Dubois usually arrives around December 26, and the last of the season around February 24. Those are the middle dates across the winters of 1991–2020 at Dubois S In Forage Fm, IN, 4.5 miles away: half of years saw snow earlier, half later. Snow fell in 95% of those winters. The last 32°F night of spring typically comes 60 days after the last snow.

ZIP 47527 is 5 miles from Dubois S In Forage Fm, IN, which stands at 690 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 47432 (French Lick). The 2023 USDA Plant Hardiness Zone Map lists ZIP 47527 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.