Frost Dates for 08090 — Wenonah, New Jersey

Half of springs at Glassboro 2 NE, NJ see their last 32°F night by April 8; only one in ten is past it by March 27, and one in ten still has one after April 22. Planting tender crops after April 14 leaves a 30% risk of a frost on them, after April 17 20%, and after April 22 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 66% of the 56 New Jersey stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 1 in half of years, as early as October 18 one year in ten, and holds off past November 15 one year in ten. A hard freeze of 28°F follows 10 days later, around November 11; in spring the one-in-ten date for 28°F is April 9, 13 days before the 32°F one. The freeze-free season lasts 205 days in a typical year, longer than at 70% of the 56 New Jersey stations; it reaches 224 days one year in ten and falls short of 187 one year in ten. On average 100 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 14 days longer, to about April 22, and return around October 21. Severe cold of 16°F or below comes in 99% of winters, usually between December 31 and February 21.

July is the warmest month at Glassboro 2 NE, NJ, averaging 87°F by day and 67°F at night; January is the coldest at 41°F and 25°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 76% of years.

Warmth for growing adds up to 3,696 growing degree days a year (base 50°F), more than at 70% of the 56 New Jersey stations. 33% of them (1,217) have built up by the end of June, and July adds the most, 837.

The nearest other station, Philadelphia International Airport, PA, 6 miles northwest of Wenonah, has a last frost 6 days earlier (April 2), a first frost 9 days later (November 10), a season 19 days longer.

The first measurable snow (0.1 inch or more) in Wenonah usually arrives around December 11, and the last of the season around March 18. Those are the middle dates across the winters of 1991–2020 at Somerdale 4 SW, NJ, 6.3 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 21 days after the last snow.

ZIP 08090 is 5 miles from Glassboro 2 NE, NJ, which stands at 100 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 12 other ZIP codes share the station; its figures are presented in full for 08081 (Sicklerville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 08090 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.