Frost Dates for 79520 — Hamlin, Texas

Half of springs at Anson, TX see their last 32°F night by March 31; only one in ten is past it by March 11, and one in ten still has one after April 15. Planting tender crops after April 6 leaves a 30% risk of a frost on them, after April 9 20%, and after April 15 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 94% of the 339 Texas stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 6 in half of years, as early as October 23 one year in ten, and holds off past November 22 one year in ten. A hard freeze of 28°F follows 10 days later, around November 16; in spring the one-in-ten date for 28°F is April 4, 11 days before the 32°F one. The freeze-free season lasts 221 days in a typical year, shorter than at 86% of the 339 Texas stations; it reaches 247 days one year in ten and falls short of 199 one year in ten. On average 56 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 9 days longer, to about April 9, and return around October 29. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 88%.

July is the warmest month at Anson, TX, averaging 96°F by day and 71°F at night; January is the coldest at 57°F and 29°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 48% of years.

Warmth for growing adds up to 5,860 growing degree days a year (base 50°F), fewer than at 79% of the 351 Texas stations. 40% of them (2,347) have built up by the end of June, and July adds the most, 1,032. Precipitation totals 25.6 inches a year, most in June (3.6") and least in January (1.0"); May to September bring 56% of it.

The nearest other station, Stamford 1, TX, 20 miles east of Hamlin, has a last frost 8 days earlier (March 23), a first frost 5 days later (November 11), a season 13 days longer.

The first measurable snow (0.1 inch or more) in Hamlin usually arrives around December 21, and the last of the season around January 30. Those are the middle dates across the winters of 1991–2020 at Hamlin 1SW, TX, 1.1 miles away: half of years saw snow earlier, half later. Snow fell in 79% of those winters. The last 32°F night of spring typically comes 60 days after the last snow.

ZIP 79520 is 16 miles from Anson, TX, which stands at 1,717 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station; its figures are presented in full for 79525 (Hawley). The 2023 USDA Plant Hardiness Zone Map lists ZIP 79520 in zone 8a, the band where the coldest night of the year averaged 10 to 15°F (-12.2 to -9.4°C) over 1991–2020; a zone describes winter lows, not frost dates.