Frost Dates for 47567 — Petersburg, Indiana

Half of springs at Petersburg 61 Brg, IN see their last 32°F night by April 20; only one in ten is past it by April 6, and one in ten still has one after May 4. Planting tender crops after April 25 leaves a 30% risk of a frost on them, after April 29 20%, and after May 4 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 89% of the 125 Indiana stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 22 in half of years, as early as October 8 one year in ten, and holds off past November 2 one year in ten. A hard freeze of 28°F follows 10 days later, around November 1; in spring the one-in-ten date for 28°F is April 21, 13 days before the 32°F one. The freeze-free season lasts 186 days in a typical year, longer than at 62% of the 125 Indiana stations; it reaches 204 days one year in ten and falls short of 166 one year in ten. On average 103 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 April 30, and return around October 12. Severe cold of 16°F or below comes every winter, usually between December 6 and March 2.

July is the warmest month at Petersburg 61 Brg, IN, averaging 86°F by day and 64°F at night; January is the coldest at 39°F and 22°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 16% of years.

Warmth for growing adds up to 3,629 growing degree days a year (base 50°F), more than at 66% of the 125 Indiana stations. 36% of them (1,317) have built up by the end of June, and July adds the most, 775. Precipitation totals 47.9 inches a year, most in April (5.1") and least in February (2.9"); May to September bring 44% of it.

The nearest other station, Washington 1 W, IN, 13 miles northeast of Petersburg, has a last frost 10 days earlier (April 10), a first frost 3 days later (October 25), a season 11 days longer.

The first measurable snow (0.1 inch or more) in Petersburg usually arrives around December 24, and the last of the season around February 24. Those are the middle dates across the winters of 1991–2020 at Petersburg 61 Brg, IN, 2.1 miles away: half of years saw snow earlier, half later. Snow fell in 94% of those winters. The last 32°F night of spring typically comes 55 days after the last snow.

ZIP 47567 is 2 miles from Petersburg 61 Brg, IN, which stands at 472 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 47567 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.