Mertzon, TX climate
Mertzon has mild winters and hot summers, with very little rain. A typical July afternoon reaches 95°, a January night drops to 32°, and about 1 inches of snow falls in a normal winter.
NOAA 1991-2020 climate normals Updated once a decadeWhat a year in Mertzon feels like
Winter
Spring
Summer
Fall
Mertzon 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 | 60° | 32° | 0.9" | 0.5" | 4 | 0 | 40° – 51° |
| February | 65° | 36° | 1.2" | 0.4" | 5 | 0 | 44° – 57° |
| March | 72° | 44° | 1.5" | 0 | 6 | 0 | 52° – 64° |
| April | 81° | 51° | 1.6" | 0.1" | 5 | 0 | 58° – 71° |
| May | 88° | 61° | 2.8" | 0 | 7 | 0 | 69° – 81° |
| June | 93° | 68° | 2.6" | 0 | 5 | 0 | 77° – 86° |
| July | 95° | 71° | 1.6" | 0 | 6 | 0 | 78° – 87° |
| August | 95° | 70° | 2.5" | 0 | 6 | 0 | 77° – 87° |
| September | 88° | 63° | 2.6" | 0 | 6 | 0 | 71° – 82° |
| October | 79° | 52° | 2.1" | 0 | 6 | 0 | 63° – 70° |
| November | 68° | 41° | 1.2" | 0 | 4 | 0 | 49° – 60° |
| December | 60° | 33° | 0.9" | 0.3" | 4 | 0 | 42° – 51° |
| Year | 79° | 52° | 21.4" | 1.3" | 62 | 1 |
“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 Mertzon
Mertzon gets 21 inches of rain and melted snow a year. May is the wettest month and December the driest. Rain or snow falls on about 62 days a year.
About 215 frost-free days a year
In half of years the last 32° night comes by April 1 and the first one by November 4. That leaves about 215 frost-free days for gardens, longer than 80% of U.S. towns.
Heating and cooling a home in Mertzon
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Mertzon, 54% of that work is heating and 46% is cooling.
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.
How Mertzon 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 Mertzon averaged 0.9° warmer than the 1900s. The biggest change is in March (+1.8°). The shift is smaller than in 79% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Mertzon’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. April swings the most: between 1991 and 2020 its average temperature ranged from 58° to 71°. October is the most reliable, staying within 7°.
Common questions about Mertzon’s climate
What is the coldest month in Mertzon?
January, with a typical high of 60° and a low of 32°.
What is the hottest month in Mertzon?
July, with a typical high of 95° and a low of 71°. About 116 days a year reach 90°.
How much snow does Mertzon get?
About 1 inches in a normal winter, most of it in January.
When is the first frost in Mertzon?
In half of years the first 32° night comes by November 4, and the last spring frost by April 1.
What is the rainiest month in Mertzon?
May, with 2.8 inches of rain and melted snow. The year totals 21 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Mertzon itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at San Angelo Wfo, TX (21 mi, snow) and Mertzon 12nnw, TX (12 mi, frost, heat and degree days). Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.