Hartley, Texas climate: Normal weather by month, frost dates and records
Hartley's normal year runs from 21°F January nights to 92°F July afternoons, with 17.7 inches of precipitation and 15 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.2°C, January lows of −6°C, July highs of 33°C, 449 mm of precipitation a year.
- NOAA stationHartley
- Station IDUSC00413979
- Location35.88°N 102.39°W
- Elevation3,887 ft (1,185 m)
- Population (census place)514
On October 23, the normal high in Hartley is 69°F and the normal low 39°F, and the chance of measurable rain or snow is 13%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Hartley.
- Jan 49° 21°
- Feb 54° 23°
- Mar 62° 31°
- Apr 70° 39°
- May 78° 49°
- Jun 88° 58°
- Jul 92° 64°
- Aug 89° 62°
- Sep 82° 54°
- Oct 72° 42°
- Nov 60° 30°
- Dec 49° 22°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Hartley each month?
July is the warmest month, with normal highs of 92°F; January the coldest, with normal lows of 21°F. The most precipitation falls in June (2.64 in), the least in February (0.43 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 49°F | 21°F | 35.3°F | 0.54 | 3.5 | 2 | <1 | 30 | 10 h |
| February | 54°F | 23°F | 38.2°F | 0.43 | 3.4 | 3 | <1 | 26 | 10 h 50 min |
| March | 62°F | 31°F | 46.4°F | 1.12 | 1.6 | 4 | <1 | 19 | 11 h 50 min |
| April | 70°F | 39°F | 54.0°F | 1.38 | 1.3 | 4 | <1 | 8 | 13 h |
| May | 78°F | 49°F | 63.6°F | 1.77 | 0.0 | 6 | 4 | 1 | 14 h |
| June | 88°F | 58°F | 73.0°F | 2.64 | 0.0 | 6 | 15 | <1 | 14 h 30 min |
| July | 92°F | 64°F | 77.6°F | 2.56 | 0.0 | 7 | 20 | <1 | 14 h 20 min |
| August | 89°F | 62°F | 75.6°F | 2.40 | 0.0 | 10 | 16 | <1 | 13 h 30 min |
| September | 82°F | 54°F | 68.4°F | 1.55 | 0.0 | 4 | 6 | <1 | 12 h 30 min |
| October | 72°F | 42°F | 56.9°F | 1.94 | 0.0 | 5 | 1 | 3 | 11 h 20 min |
| November | 60°F | 30°F | 44.7°F | 0.48 | 1.3 | 2 | <1 | 19 | 10 h 20 min |
| December | 49°F | 22°F | 35.5°F | 0.88 | 3.4 | 4 | <1 | 29 | 9 h 40 min |
| Year (annual) | 70°F | 41°F | 55.8°F | 17.69 | 14.5 | 56 | 62 | 135 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 10°C | −6°C | 1.8°C | 14 mm | 9 cm |
| February | 12°C | −5°C | 3.4°C | 11 mm | 9 cm |
| March | 17°C | −1°C | 8.0°C | 28 mm | 4 cm |
| April | 21°C | 4°C | 12.2°C | 35 mm | 3 cm |
| May | 26°C | 9°C | 17.6°C | 45 mm | 0 cm |
| June | 31°C | 15°C | 22.8°C | 67 mm | 0 cm |
| July | 33°C | 18°C | 25.3°C | 65 mm | 0 cm |
| August | 32°C | 17°C | 24.2°C | 61 mm | 0 cm |
| September | 28°C | 12°C | 20.2°C | 39 mm | 0 cm |
| October | 22°C | 6°C | 13.8°C | 49 mm | 0 cm |
| November | 15°C | −1°C | 7.1°C | 12 mm | 3 cm |
| December | 10°C | −6°C | 1.9°C | 22 mm | 9 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00413979; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Hartley?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, April has the fewest days with rain (4).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00413979.
When is the last frost in Hartley?
In Hartley, the last spring frost (32°F) comes after April 22 in half of years and after May 5 in one year in ten; the first autumn frost comes before October 24 in half of years and before October 11 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- April 221 year in 10 after May 5; 9 in 10 after April 7
- First autumn frost, half of years before
- October 241 year in 10 before October 11; 9 in 10 before November 3
NOAA puts the median frost-free season at 183 days, and the season without a hard freeze (28°F) at 204 days.
A hard freeze (28°F) comes after April 11 in half of springs and before November 1 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Hartley in zone 7a in ZIP code 79044, the nearest ZIP area.
Frost dates for every NOAA station in Texas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00413979; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Hartley?
In a normal year in Hartley, 62 days a year reach 90°F (5 of them 100°F or more), 135 nights fall to 32°F or colder and 56 days bring measurable precipitation.
- Days at 90°F or more
- 62a normal year
- Days at 100°F or more
- 5a normal year
- Nights at 32°F or colder
- 135a normal year
- Days that stay below freezing
- 13high of 32°F or less
- Days with 0.01 inch of precipitation
- 56a normal year
- Days with 1 inch of snow or more
- 4a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00413979.
How sunny is Hartley?
Over a year 86% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Hartley, 5.4 kWh per square metre a day. June is the sunniest month (90%) and February the cloudiest (81%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 84% | 3.2 |
| February | 81% | 4.0 |
| March | 83% | 5.3 |
| April | 85% | 6.6 |
| May | 86% | 7.3 |
| June | 90% | 7.8 |
| July | 90% | 7.5 |
| August | 88% | 6.6 |
| September | 88% | 5.7 |
| October | 85% | 4.4 |
| November | 85% | 3.4 |
| December | 81% | 2.8 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Hartley need?
A normal year in Hartley brings 4,558 heating degree days, 15% fewer than the median U.S. place (5,373), and 1,220 cooling degree days, 34% more than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,871 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 921 | 0 |
| February | 749 | 0 |
| March | 577 | 1 |
| April | 340 | 10 |
| May | 123 | 78 |
| June | 7 | 247 |
| July | 0 | 391 |
| August | 2 | 331 |
| September | 42 | 142 |
| October | 273 | 21 |
| November | 609 | 0 |
| December | 914 | 0 |
| Year (annual) | 4,558 | 1,220 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00413979. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Hartley's climate compare?
Hartley is warmer than 0 of the other 320 places with their own NOAA record in Texas, and wetter than 29. Across the 7,247 U.S. stations with normals, its annual mean of 55.8°F is warmer than 63%.
In the Köppen classification computed from these normals, Hartley is Cfa: temperate, no dry season, hot summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Questions about Hartley's climate
What is the coldest month in Hartley?
January, with a normal high of 49°F and a normal low of 21°F. The warmest is July (92°F by day, 64°F at night).
Does it snow in Hartley?
Yes: 15 inches in a normal year, falling on 8 days with 0.1 inch or more, the most in January (3.5 inches).
What is the rainiest month in Hartley?
June, with 2.64 in of precipitation in a normal year; the driest is February with 0.43 in.
What plant hardiness zone is Hartley in?
The USDA's 2023 map puts Hartley in zone 7a in ZIP code 79044, the nearest ZIP area.
How late can frost come in Hartley?
In half of years the last 32°F night comes after April 22; in one year in ten it comes after May 5. Waiting until May 5 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Dalhart, TX13 miles from this station, 56.8°F a year
- Channing, TX14 miles from this station, 56.5°F a year
- Dumas, TX23 miles from this station, 56.5°F a year
- Boys Ranch, TX25 miles from this station, 58.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made