Frost Dates for 46366 — North Judson, Indiana

Half of springs at Knox Wwtp, IN see their last 32°F night by April 26; only one in ten is past it by April 12, 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 7 20%, and after May 12 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 5 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 30; in spring the one-in-ten date for 28°F is April 30, 12 days before the 32°F one. The freeze-free season lasts 174 days in a typical year, shorter than at 72% of the 125 Indiana stations; it reaches 194 days one year in ten and falls short of 154 one year in ten. On average 137 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 6, and return around October 8. Severe cold of 16°F or below comes every winter, usually between December 1 and March 10.

July is the warmest month at Knox Wwtp, IN, averaging 82°F by day and 62°F at night; January is the coldest at 32°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 35% of years.

Warmth for growing adds up to 2,926 growing degree days a year (base 50°F), fewer than at 96% of the 125 Indiana stations. 35% of them (1,036) have built up by the end of June, and July adds the most, 686. Precipitation totals 42.4 inches a year, most in June (4.7") and least in February (2.4"); May to September bring 51% of it.

The nearest other station, Wheatfield, IN, 15 miles west of North Judson, has a last frost 1 day earlier (April 25), a first frost 2 days earlier (October 17), a season 1 day shorter.

The first measurable snow (0.1 inch or more) in North Judson usually arrives around December 5, and the last of the season around March 15. Those are the middle dates across the winters of 1991–2020 at N Judson 3 S, IN, 2.8 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 42 days after the last snow.

ZIP 46366 is 10 miles from Knox Wwtp, 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 46534 (Knox). The 2023 USDA Plant Hardiness Zone Map lists ZIP 46366 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.