Photo: Ketiltrout · CC BY-SA 4.0Dry weather: only 14 inches of rain and melted snow a year in Fort Sumner, less than in 94% of U.S. towns
July afternoons average 93°. The gap between a January night and a July afternoon is 68°. Summer afternoons here are warmer than in 92% of U.S. towns. Picnics, hikes and garden evenings suit April, May and October, with highs of 75–84°.
A year in Fort Sumner at a glance
Each month’s typical high and low, and what it brings.
What stands out about Fort Sumner’s climate
Compared with towns across the U.S., with Fort Sumner’s place in New Mexico beside it.
What a year in Fort Sumner feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 201 frost-free days a year
In half of years the last 32° night comes by April 9 and the first by October 30. Frost and day counts come from NOAA’s station at Ft Sumner, NM, 0.9 miles from the town’s center, at about the same height.
The 2023 USDA map puts Fort Sumner’s center in zone 7a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 4°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 9 inches of snow a winter
Snow, measured at Ft Sumner, NM, falls mostly in January. Precipitation (rain plus melted snow) adds up to 14 inches a year; July is the wettest month and February the driest. Rain or snow falls on about 62 days a year.
Rain + melted snow by month
Inches of water
Snowfall by month
Inches of snow
Heating and cooling a home in Fort Sumner
70% of the work is heating. Months averaging under 55° run from November through March.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Ft Sumner, NM.
Living with Fort Sumner’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
201 frost-free days in zone 7a. The last frost comes by Apr 9 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Oct 30.
Months with highs of 62–84° and lows of 40° or more: April, May and October. 6.9 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Fort Sumner from natural hazards, river flooding is the largest share (52%); heat waves, cold waves, winter storms and ice storms together are 3%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Fort Sumner and similar climates
TownRatings has no climate map of the towns around Fort Sumner yet.
Climates most like Fort Sumner’s, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Fort Sumner, NM | 25° | 93° | 14" | 9.1" |
| Emmett, ID | 23° | 93° | 13" | 7.4" |
| Dumas, TX | 23° | 93° | 18" | 9.1" |
| Chino Valley, AZ | 27° | 92° | 11" | 10" |
| Clarkston, WA | 30° | 93° | 12" | 13" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Fort Sumner averaged 1.6° warmer than the 1900s. The biggest change is in March (+2.8°).
A bigger shift than in 67% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Fort Sumner compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Fort Sumner’s place among New Mexico’s.
Fort Sumner weather by month
Highs, lows and precipitation from NOAA’s grid at Fort Sumner’s center; snow, wet days and snow on the ground from Ft Sumner, NM. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 55° | 25° | 0.4" | 3.0" | 3 | 3 | 32° – 44° |
| February | 60° | 28° | 0.4" | 1.3" | 4 | 1 | 39° – 51° |
| March | 67° | 34° | 0.6" | 1.0" | 5 | 1 | 46° – 57° |
| April | 75° | 41° | 0.8" | 0.2" | 4 | 0 | 52° – 63° |
| May | 84° | 51° | 1.2" | 0.0" | 5 | 0 | 64° – 74° |
| June | 92° | 61° | 1.4" | 0.0" | 6 | 0 | 72° – 81° |
| July | 93° | 65° | 2.8" | 0.0" | 8 | 0 | 75° – 84° |
| August | 91° | 64° | 2.3" | 0.0" | 8 | 0 | 74° – 82° |
| September | 85° | 56° | 1.8" | 0.0" | 6 | 0 | 65° – 76° |
| October | 75° | 44° | 1.6" | 0.3" | 5 | 0 | 55° – 64° |
| November | 63° | 33° | 0.5" | 0.7" | 3 | 0 | 41° – 54° |
| December | 55° | 25° | 0.5" | 2.6" | 4 | 3 | 33° – 44° |
| Year | 74° | 44° | 14.3" | 9.1" | 62 | 8 |
How much a month can swing
A normal is an average. November swings the most: from 1991 to 2020 its average ranged from 41° to 54°. August is the most reliable, staying within 9°.
Where Fort Sumner’s numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Fort Sumner’s center.
- Snow: Ft Sumner, NM (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Ft Sumner, NM, 0.9 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Fort Sumner’s climate
What is the weather like in Fort Sumner?
A typical July afternoon reaches 93°, a January night drops to 25°, and about 9 inches of snow falls in a normal winter. Milder January nights than 63% of U.S. towns; hotter July afternoons than 92% of U.S. towns.
How cold does it get in Fort Sumner in winter?
January nights average 25°. About 114 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 32°.
How much snow does Fort Sumner get?
About 9.1 inches in a normal winter at Ft Sumner, NM, most of it in January, with snow on the ground about 8 days a year.
How hot does it get in Fort Sumner?
July, with a typical high of 93° and a low of 65°. About 68 days a year reach 90° and 4 reach 100° (Ft Sumner, NM).
When is the first and last frost in Fort Sumner?
In half of years the last spring frost (32°) comes by April 9 and the first fall frost by October 30, about 201 frost-free days, at Ft Sumner, NM.
What growing zone is Fort Sumner in?
Zone 7a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 4°.
What is the best time of year to visit Fort Sumner?
By one simple rule (highs of 62–84° and lows of 40° or more), April, May and October. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Fort Sumner getting warmer?
Yes: 1991–2020 averaged 1.6° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 67% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Fort Sumner.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.