Frost Dates for 46996 — Winamac, Indiana

Half of springs at Winamac 2SSE, IN see their last 32°F night by April 25; only one in ten is past it by April 11, and one in ten still has one after May 11. Planting tender crops after May 1 leaves a 30% risk of a frost on them, after May 5 20%, and after May 11 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 18 in half of years, as early as October 1 one year in ten, and holds off past October 31 one year in ten. A hard freeze of 28°F follows 11 days later, around October 29; in spring the one-in-ten date for 28°F is April 27, 14 days before the 32°F one. The freeze-free season lasts 173 days in a typical year, shorter than at 77% of the 125 Indiana stations; it reaches 193 days one year in ten and falls short of 153 one year in ten. On average 133 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 5, and return around October 7. Severe cold of 16°F or below comes every winter, usually between December 1 and March 13.

July is the warmest month at Winamac 2SSE, IN, averaging 84°F by day and 63°F at night; January is the coldest at 33°F and 16°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 32% of years.

Warmth for growing adds up to 3,113 growing degree days a year (base 50°F), fewer than at 71% of the 125 Indiana stations. 35% of them (1,095) have built up by the end of June, and July adds the most, 715. Precipitation totals 39.9 inches a year, most in July (4.7") and least in February (2.1"); May to September bring 52% of it.

The nearest other station, Francesville, IN, 13 miles west of Winamac, has a last frost 1 day later (April 26), a first frost 1 day earlier (October 17).

The first measurable snow (0.1 inch or more) in Winamac usually arrives around December 5, and the last of the season around March 13. Those are the middle dates across the winters of 1991–2020 at Winamac 2SSE, IN, 3.5 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 43 days after the last snow.

ZIP 46996 is 4 miles from Winamac 2SSE, IN, which stands at 690 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 46996 in zone 5b, the band where the coldest night of the year averaged -15 to -10°F (-26.1 to -23.3°C) over 1991–2020; a zone describes winter lows, not frost dates.