South River, NM climate
South River has chilly winters and warm summers, with very little rain. A typical July afternoon reaches 92°, a January night drops to 18°, and about 11 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in South River feels like
Winter
Spring
Summer
Fall
South River weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 42° | 18° | 0.8" | 4.5" | 6 | 3 | 24° – 37° |
| February | 49° | 23° | 0.7" | 2.3" | 5 | 2 | 32° – 42° |
| March | 59° | 29° | 0.7" | 0.5" | 4 | 0 | 40° – 50° |
| April | 67° | 35° | 0.6" | 0.2" | 4 | 0 | 47° – 55° |
| May | 77° | 43° | 0.6" | 0 | 4 | 0 | 55° – 64° |
| June | 88° | 52° | 0.3" | 0 | 2 | 0 | 65° – 76° |
| July | 92° | 60° | 0.8" | 0 | 5 | 0 | 72° – 79° |
| August | 89° | 59° | 1.1" | 0 | 7 | 0 | 71° – 78° |
| September | 81° | 50° | 1.1" | 0 | 6 | 0 | 60° – 69° |
| October | 69° | 38° | 0.9" | 0.3" | 5 | 0 | 49° – 58° |
| November | 54° | 26° | 0.7" | 0.9" | 4 | 1 | 34° – 47° |
| December | 42° | 19° | 0.7" | 2.2" | 5 | 3 | 25° – 37° |
| Year | 67° | 38° | 9.0" | 10.9" | 57 | 9 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in South River
South River gets 9 inches of rain and melted snow a year. September is the wettest month and June the driest. Rain or snow falls on about 57 days a year. Snow covers the ground about 9 days of the year.
About 147 frost-free days a year
In half of years the last 32° night comes by May 12 and the first one by October 6. That leaves about 147 frost-free days for gardens, shorter than 83% of U.S. towns.
Heating and cooling a home in South River
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In South River, 85% of that work is heating and 15% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
South River and its neighbors
South River borders 5 towns with climate data. January nights across them vary by 0.9°. Spencerville has the coldest January nights (17°) and Crouch Mesa the hottest July afternoons (92°). South River’s January low is 18° and its July high 92°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How South River compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in South River averaged 1.7° warmer than the 1900s. The biggest change is in January (+2.6°). The shift is larger than in 82% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at South River’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. November swings the most: between 1991 and 2020 its average temperature ranged from 34° to 47°. August is the most reliable, staying within 7°.
Common questions about South River’s climate
What is the coldest month in South River?
January, with a typical high of 42° and a low of 18°.
What is the hottest month in South River?
July, with a typical high of 92° and a low of 60°. About 61 days a year reach 90°.
How much snow does South River get?
About 11 inches in a normal winter, most of it in January.
When is the first frost in South River?
In half of years the first 32° night comes by October 6, and the last spring frost by May 12.
What is the rainiest month in South River?
September, with 1.1 inches of rain and melted snow. The year totals 9 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for South River itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Aztec Ruins Nm, NM (5 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.