Shamrock, Texas climate: Normal weather by month, frost dates and records
Shamrock's normal year runs from 24°F January nights to 94°F July afternoons, with 25.3 inches of precipitation and 9 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 14.8°C, January lows of −5°C, July highs of 34°C, 642 mm of precipitation a year.
- NOAA stationShamrock #2
- Station IDUSC00418236
- Location35.22°N 100.25°W
- Elevation2,360 ft (719 m)
- From the centerunder 1 mile
- Population1,717
On October 23, the normal high in Shamrock is 71°F and the normal low 42°F, and the chance of measurable rain or snow is 15%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Shamrock.
- Jan 50° 24°
- Feb 55° 27°
- Mar 64° 35°
- Apr 72° 43°
- May 81° 53°
- Jun 89° 63°
- Jul 94° 68°
- Aug 93° 66°
- Sep 85° 58°
- Oct 73° 45°
- Nov 61° 34°
- Dec 51° 26°
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 Shamrock each month?
July is the warmest month, with normal highs of 94°F; January the coldest, with normal lows of 24°F. The most precipitation falls in June (3.73 in), the least in January (0.84 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 50°F | 24°F | 37.1°F | 0.84 | 2.7 | 3 | <1 | 26 | 10 h |
| February | 55°F | 27°F | 40.6°F | 0.90 | 2.1 | 4 | <1 | 20 | 10 h 50 min |
| March | 64°F | 35°F | 49.1°F | 1.70 | 1.6 | 5 | <1 | 11 | 11 h 50 min |
| April | 72°F | 43°F | 57.5°F | 2.50 | 0.0 | 5 | 2 | 3 | 13 h |
| May | 81°F | 53°F | 66.7°F | 3.36 | 0.0 | 8 | 7 | <1 | 14 h |
| June | 89°F | 63°F | 76.2°F | 3.73 | 0.0 | 7 | 16 | <1 | 14 h 30 min |
| July | 94°F | 68°F | 80.7°F | 2.41 | 0.0 | 6 | 25 | <1 | 14 h 20 min |
| August | 93°F | 66°F | 79.3°F | 2.80 | 0.0 | 7 | 22 | <1 | 13 h 30 min |
| September | 85°F | 58°F | 71.5°F | 2.42 | 0.0 | 6 | 9 | <1 | 12 h 30 min |
| October | 73°F | 45°F | 59.4°F | 2.31 | 0.0 | 5 | 2 | 1 | 11 h 20 min |
| November | 61°F | 34°F | 47.4°F | 1.29 | 0.8 | 4 | <1 | 12 | 10 h 20 min |
| December | 51°F | 26°F | 38.5°F | 1.03 | 1.9 | 4 | <1 | 25 | 9 h 50 min |
| Year (annual) | 72°F | 45°F | 58.7°F | 25.29 | 9.1 | 62 | 82 | 97 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 10°C | −5°C | 2.8°C | 21 mm | 7 cm |
| February | 13°C | −3°C | 4.8°C | 23 mm | 5 cm |
| March | 18°C | 1°C | 9.5°C | 43 mm | 4 cm |
| April | 22°C | 6°C | 14.2°C | 64 mm | 0 cm |
| May | 27°C | 12°C | 19.3°C | 85 mm | 0 cm |
| June | 32°C | 17°C | 24.6°C | 95 mm | 0 cm |
| July | 34°C | 20°C | 27.1°C | 61 mm | 0 cm |
| August | 34°C | 19°C | 26.3°C | 71 mm | 0 cm |
| September | 29°C | 15°C | 21.9°C | 61 mm | 0 cm |
| October | 23°C | 7°C | 15.2°C | 59 mm | 0 cm |
| November | 16°C | 1°C | 8.6°C | 33 mm | 2 cm |
| December | 11°C | −4°C | 3.6°C | 26 mm | 5 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00418236; 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 Shamrock?
Normal highs sit between 65°F and 85°F in April, May, September and October. Of those, October has the fewest days with rain (5).
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 USC00418236.
When is the last frost in Shamrock?
In Shamrock, the last spring frost (32°F) comes after April 9 in half of years and after April 26 in one year in ten; the first autumn frost comes before October 30 in half of years and before October 17 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 91 year in 10 after April 26; 9 in 10 after March 26
- First autumn frost, half of years before
- October 301 year in 10 before October 17; 9 in 10 before November 11
NOAA puts the median frost-free season at 202 days, and the season without a hard freeze (28°F) at 222 days.
A hard freeze (28°F) comes after March 31 in half of springs and before November 6 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Shamrock in zone 7b in ZIP code 79079, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Shamrock's NOAA station is in zone 7b: the coldest night of a typical year reaches 5°F (23 complete years).
Frost dates for every NOAA station in Texas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00418236; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. 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 Shamrock?
In a normal year in Shamrock, 82 days a year reach 90°F (16 of them 100°F or more), 97 nights fall to 32°F or colder and 62 days bring measurable precipitation.
- Days at 90°F or more
- 82a normal year
- Days at 100°F or more
- 16a normal year
- Nights at 32°F or colder
- 97a normal year
- Days that stay below freezing
- 10high of 32°F or less
- Days with 0.01 inch of precipitation
- 62a normal year
- Days with 1 inch of snow or more
- 4a normal year
The highest temperature in this station's record (since 1962) is 117°F, on July 12, 2011; the lowest is −13°F, on January 19, 1984.
The wettest calendar year on that record is 1991, with 36.73 in; the snowiest season is 2000–01, with 30.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00418236; records: ACIS (NOAA Regional Climate Centers), station USC00418236. Records use complete months only; a month missing more than three days is left out.
How sunny is Shamrock?
Over a year 84% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Shamrock, 5.1 kWh per square metre a day. July is the sunniest month (89%) and February the cloudiest (79%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 83% | 3.1 |
| February | 79% | 3.8 |
| March | 80% | 5.0 |
| April | 82% | 6.2 |
| May | 82% | 6.8 |
| June | 88% | 7.4 |
| July | 89% | 7.2 |
| August | 87% | 6.4 |
| September | 87% | 5.4 |
| October | 82% | 4.2 |
| November | 83% | 3.2 |
| December | 80% | 2.7 |
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 Shamrock need?
A normal year in Shamrock brings 3,972 heating degree days, 26% fewer than the median U.S. place (5,373), and 1,698 cooling degree days, 87% more than the median (908). Five months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,634 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 865 | 0 |
| February | 683 | 0 |
| March | 498 | 5 |
| April | 253 | 26 |
| May | 78 | 132 |
| June | 4 | 340 |
| July | 1 | 489 |
| August | 1 | 444 |
| September | 27 | 222 |
| October | 212 | 38 |
| November | 528 | 2 |
| December | 823 | 0 |
| Year (annual) | 3,972 | 1,698 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00418236. 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.
Has Shamrock been warmer than normal lately?
Over 32 complete years from 1967 to 2016, the station's annual mean temperature rose at a fitted 2.6°F per century (+0.14°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Shamrock's climate compare?
Shamrock is warmer than 23 of the other 320 places with their own NOAA record in Texas, and wetter than 114. Across the 7,247 U.S. stations with normals, its annual mean of 58.7°F is warmer than 71%.
In the Köppen classification computed from these normals, Shamrock 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.
Which places near Shamrock share this climate record?
4 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Wheeler, TX1,449 people · 16 mi N
- Sweetwater, OK102 people · 23 mi NE
- Texola, OK41 people · 15 mi E
- Samnorwood, TX29 people · 12 mi S
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Shamrock's climate
What is the coldest month in Shamrock?
January, with a normal high of 50°F and a normal low of 24°F. The warmest is July (94°F by day, 68°F at night).
Does it snow in Shamrock?
Yes: 9 inches in a normal year, falling on 5 days with 0.1 inch or more, the most in January (2.7 inches).
What is the rainiest month in Shamrock?
June, with 3.73 in of precipitation in a normal year; the driest is January with 0.84 in.
What plant hardiness zone is Shamrock in?
The USDA's 2023 map puts Shamrock in zone 7b in ZIP code 79079, the nearest ZIP area. By the same method at Shamrock's NOAA station, the coldest night of a typical year reaches 5°F (23 years, 1991-2020): zone 7b.
How late can frost come in Shamrock?
In half of years the last 32°F night comes after April 9; in one year in ten it comes after April 26. Waiting until April 26 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- McLean, TX19 miles from this station, 59.9°F a year
- Erick, OK22 miles from this station, 59.6°F a year
- Wellington, TX26 miles from this station, 63.4°F a year
- Cheyenne, OK37 miles from this station, 59.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made