Frost Dates for 18064 — Nazareth, Pennsylvania

Half of springs at Phillipsburg-Easton Brg, NJ see their last 32°F night by April 18; only one in ten is past it by April 5, and one in ten still has one after May 5. Planting tender crops after April 24 leaves a 30% risk of a frost on them, after April 29 20%, and after May 5 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 50% of the 176 Pennsylvania stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 25 in half of years, as early as October 11 one year in ten, and holds off past November 5 one year in ten. A hard freeze of 28°F follows 10 days later, around November 4; in spring the one-in-ten date for 28°F is April 18, 17 days before the 32°F one. The freeze-free season lasts 188 days in a typical year, longer than at 76% of the 176 Pennsylvania stations; it reaches 206 days one year in ten and falls short of 165 one year in ten. On average 119 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 13 days longer, to about May 1, and return around October 13. Severe cold of 16°F or below comes every winter, usually between December 7 and March 6.

July is the warmest month at Phillipsburg-Easton Brg, NJ, averaging 86°F by day and 64°F at night; January is the coldest at 38°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 3,197 growing degree days a year (base 50°F), more than at 70% of the 176 Pennsylvania stations. 34% of them (1,072) have built up by the end of June, and July adds the most, 764.

The nearest other station, Allentown International Airport, PA, 10 miles southwest of Nazareth and 158 feet higher, has a last frost 2 days later (April 20), a first frost 1 day earlier (October 24), a season 4 days shorter.

The first measurable snow (0.1 inch or more) in Nazareth usually arrives around January 8, and the last of the season around February 17. Those are the middle dates across the winters of 1991–2020 at Phillipsburg-Easton Brg, NJ, 7 miles away: half of years saw snow earlier, half later. Snow fell in 88% of those winters. The last 32°F night of spring typically comes 60 days after the last snow.

ZIP 18064 is 7 miles from Phillipsburg-Easton Brg, NJ, which stands at 232 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 8 other ZIP codes share the station; its figures are presented in full for 18042 (Easton). The 2023 USDA Plant Hardiness Zone Map lists ZIP 18064 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.