Roy, New Mexico climate: Normal weather by month, frost dates and records
Roy's normal year runs from 21°F January nights to 88°F July afternoons, with 16.4 inches of precipitation and 19 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.6°C, January lows of −6°C, July highs of 31°C, 415 mm of precipitation a year.
- NOAA stationRoy
- Station IDUSC00297638
- Location35.93°N 104.14°W
- Elevation5,743 ft (1,751 m)
- Population188
On October 23, the normal high in Roy is 67°F and the normal low 35°F, and the chance of measurable rain or snow is 8%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Roy.
- Jan 48° 21°
- Feb 52° 23°
- Mar 59° 28°
- Apr 66° 35°
- May 76° 45°
- Jun 85° 54°
- Jul 88° 58°
- Aug 85° 57°
- Sep 79° 51°
- Oct 69° 38°
- Nov 57° 28°
- Dec 47° 21°
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 Roy each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 21°F. The most precipitation falls in August (3.30 in), the least in November (0.37 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 48°F | 21°F | 34.4°F | 0.61 | 4.5 | 2 | <1 | 28 | 10 h |
| February | 52°F | 23°F | 37.2°F | 0.50 | 3.0 | 2 | <1 | 24 | 10 h 50 min |
| March | 59°F | 28°F | 43.7°F | 0.78 | 4.4 | 2 | <1 | 21 | 11 h 50 min |
| April | 66°F | 35°F | 50.4°F | 0.87 | 0.5 | 3 | <1 | 9 | 13 h |
| May | 76°F | 45°F | 60.5°F | 1.28 | 0.2 | 4 | 1 | 1 | 14 h |
| June | 85°F | 54°F | 69.3°F | 2.10 | 0.0 | 5 | 7 | <1 | 14 h 30 min |
| July | 88°F | 58°F | 72.8°F | 3.08 | 0.0 | 7 | 9 | <1 | 14 h 20 min |
| August | 85°F | 57°F | 71.2°F | 3.30 | 0.0 | 8 | 5 | <1 | 13 h 30 min |
| September | 79°F | 51°F | 65.0°F | 1.85 | 0.0 | 4 | 2 | <1 | 12 h 30 min |
| October | 69°F | 38°F | 53.5°F | 1.06 | 0.2 | 3 | <1 | 5 | 11 h 20 min |
| November | 57°F | 28°F | 42.5°F | 0.37 | 2.1 | 2 | <1 | 21 | 10 h 20 min |
| December | 47°F | 21°F | 34.4°F | 0.55 | 4.4 | 2 | <1 | 28 | 9 h 40 min |
| Year (annual) | 68°F | 38°F | 52.9°F | 16.35 | 19.3 | 43 | 24 | 136 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 9°C | −6°C | 1.3°C | 15 mm | 11 cm |
| February | 11°C | −5°C | 2.9°C | 13 mm | 8 cm |
| March | 15°C | −2°C | 6.5°C | 20 mm | 11 cm |
| April | 19°C | 1°C | 10.2°C | 22 mm | 1 cm |
| May | 24°C | 7°C | 15.8°C | 33 mm | 1 cm |
| June | 29°C | 12°C | 20.7°C | 53 mm | 0 cm |
| July | 31°C | 15°C | 22.7°C | 78 mm | 0 cm |
| August | 30°C | 14°C | 21.8°C | 84 mm | 0 cm |
| September | 26°C | 11°C | 18.3°C | 47 mm | 0 cm |
| October | 21°C | 3°C | 11.9°C | 27 mm | 1 cm |
| November | 14°C | −2°C | 5.8°C | 9 mm | 5 cm |
| December | 9°C | −6°C | 1.3°C | 14 mm | 11 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00297638; 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 Roy?
Normal highs sit between 65°F and 85°F in April, May, June, September and October. Of those, October has the fewest days with rain (3).
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 USC00297638.
When is the last frost in Roy?
In Roy, the last spring frost (32°F) comes after April 30 in half of years and after May 11 in one year in ten; the first autumn frost comes before October 15 in half of years and before October 3 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 301 year in 10 after May 11; 9 in 10 after April 16
- First autumn frost, half of years before
- October 151 year in 10 before October 3; 9 in 10 before October 26
NOAA puts the median frost-free season at 167 days, and the season without a hard freeze (28°F) at 185 days.
A hard freeze (28°F) comes after April 21 in half of springs and before October 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Roy in zone 6b in ZIP code 87743, the nearest ZIP area.
Frost dates for every NOAA station in New Mexico · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00297638; 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 Roy?
In a normal year in Roy, 24 days a year reach 90°F, 136 nights fall to 32°F or colder and 43 days bring measurable precipitation.
- Days at 90°F or more
- 24a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 136a normal year
- Days that stay below freezing
- 10high of 32°F or less
- Days with 0.01 inch of precipitation
- 43a normal year
- Days with 1 inch of snow or more
- 6a normal year
The highest temperature in this station's record (since 1905) is 104°F, on July 8, 1919; the lowest is −25°F, on January 12, 1963.
The wettest calendar year on that record is 1923, with 23.71 in; the snowiest season is 2004–05, with 50.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00297638; records: ACIS (NOAA Regional Climate Centers), station USC00297638. Records use complete months only; a month missing more than three days is left out.
How sunny is Roy?
Over a year 86% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Roy, 5.5 kWh per square metre a day. June is the sunniest month (88%) and December the cloudiest (83%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 85% | 3.3 |
| February | 83% | 4.2 |
| March | 85% | 5.5 |
| April | 85% | 6.7 |
| May | 86% | 7.5 |
| June | 88% | 7.8 |
| July | 86% | 7.3 |
| August | 86% | 6.6 |
| September | 87% | 5.7 |
| October | 87% | 4.6 |
| November | 87% | 3.5 |
| December | 83% | 2.9 |
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 Roy need?
A normal year in Roy brings 5,083 heating degree days, 5% fewer than the median U.S. place (5,373), and 702 cooling degree days, 23% fewer than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,043 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 947 | 0 |
| February | 778 | 0 |
| March | 660 | 0 |
| April | 439 | 1 |
| May | 174 | 33 |
| June | 24 | 153 |
| July | 3 | 247 |
| August | 5 | 197 |
| September | 71 | 71 |
| October | 358 | 2 |
| November | 674 | 0 |
| December | 950 | 0 |
| Year (annual) | 5,083 | 702 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00297638. 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 Roy's climate compare?
Roy is warmer than 40 of the other 97 places with their own NOAA record in New Mexico, and wetter than 71. Across the 7,247 U.S. stations with normals, its annual mean of 52.9°F is warmer than 53%.
In the Köppen classification computed from these normals, Roy is BSk: cold semi-arid steppe. 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 Roy's climate
What is the coldest month in Roy?
January, with a normal high of 48°F and a normal low of 21°F. The warmest is July (88°F by day, 58°F at night).
Does it snow in Roy?
Yes: 19 inches in a normal year, falling on 7 days with 0.1 inch or more, the most in January (4.5 inches).
What is the rainiest month in Roy?
August, with 3.30 in of precipitation in a normal year; the driest is November with 0.37 in.
What plant hardiness zone is Roy in?
The USDA's 2023 map puts Roy in zone 6b in ZIP code 87743, the nearest ZIP area.
How late can frost come in Roy?
In half of years the last 32°F night comes after April 30; in one year in ten it comes after May 11. Waiting until May 11 leaves about a one-in-ten chance of a later frost.
Nearby and next
- New Mexico climateThe statewide normals and every place in the state
- Mosquero, NM14 miles from this station, 54.3°F a year
- Pasamonte, NM34 miles from this station, 50.9°F a year
- Rosebud (7 mi NW), NM34 miles from this station, 55.3°F a year
- Conchas Dam, NM37 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