Climate Comfort Score
88/100
Excellent
NOAA 1991–2020 normals 64°F annual avg Public-domain federal data
Mertzon, TX Climate
Temperature, precipitation, and comfort score from NOAA NCEI 1991–2020 normals →
- 64°F
- Avg annual temp
- 88/100
- Comfort score
- 21.6"
- Annual precip
- 217d
- Growing season
30-year climate normals from 1 weather station (1991-2020).
The climate verdict for Mertzon
Mertzon, Texas averages 64°F a year and scores 88/100 on the comfort index - excellent, milder than 92% of U.S. cities.
- 64°F
- yearly average temperature, NOAA normal
- 88/100
- comfort score, milder than 92% of U.S. cities
- 21.6"
- yearly precipitation total
- 217 days
- growing season, frost-free days
Based on NOAA U.S. Climate Normals (1991–2020) - 30-year averages describing the typical year, not a forecast.
Avg Temperature
64°F (18°C)
Avg High
78°F
Avg Low
50°F
Annual Precip
21.6"
Comfort Score
88/100
Excellent
Avg Annual Temperature
64°F
30-year mean (NOAA NCEI)
Annual Precipitation
21.6"
Liquid-equivalent total
Comfort score vs national 100-point ceiling (Mertzon) 88.0%
National median (63)
PlainClimate composite, temperature mildness, humidity, precipitation, extreme-weather frequency. Excellent for the Mertzon area.
How Mertzon compares to every U.S. city
Mertzon's comfort score vs. all U.S. cities
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
88 Top 8% higher than 92% of 6,915 US cities
Each bar is a band; taller bars hold more US cities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Warming context for Mertzon
MethodologySince 1900, U.S. land temperatures have tracked (and diverged from) the global mean - the chart below shows how. Mertzon's current NOAA 1991-2020 normal sits within that longer spread, and the most recent decade runs warmer than the 30-year mean.
- United States land mean (NOAA NCEI) +0.11 °C/decade
- Global anomaly (NASA GISTEMP) +0.11 °C/decade
- Paris Agreement thresholds 1.5°C / 2.0°C
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 58°F (15°C) | 29°F (-1°C) | 44°F (7°C) | 0.9" | 22.1 | 0.0 |
| February | 64°F (18°C) | 33°F (1°C) | 48°F (9°C) | 1.0" | 14.4 | 0.3 |
| March | 71°F (21°C) | 41°F (5°C) | 56°F (13°C) | 1.5" | 7.7 | 1.2 |
| April | 80°F (26°C) | 49°F (9°C) | 64°F (18°C) | 1.6" | 1.6 | 6.4 |
| May | 87°F (31°C) | 59°F (15°C) | 73°F (23°C) | 2.6" | 0.2 | 13.0 |
| June | 93°F (34°C) | 67°F (20°C) | 80°F (27°C) | 2.5" | 0.0 | 24.2 |
| July | 94°F (35°C) | 70°F (21°C) | 82°F (28°C) | 1.9" | 0.0 | 26.1 |
| August | 95°F (35°C) | 69°F (21°C) | 82°F (28°C) | 2.4" | 0.0 | 26.6 |
| September | 87°F (31°C) | 62°F (17°C) | 75°F (24°C) | 2.6" | 0.0 | 13.5 |
| October | 80°F (26°C) | 51°F (11°C) | 65°F (18°C) | 2.2" | 2.1 | 4.3 |
| November | 68°F (20°C) | 39°F (4°C) | 53°F (12°C) | 1.5" | 9.4 | 0.2 |
| December | 60°F (16°C) | 31°F (-1°C) | 45°F (7°C) | 0.9" | 16.5 | 0.0 |
Monthly Precipitation
Average monthly rainfall
January 0.9"
February 1.0"
March 1.5"
April 1.6"
May 2.6"
June 2.5"
July 1.9"
August 2.4"
September 2.6"
October 2.2"
November 1.5"
December 0.9"
Frost Dates & Growing Season
First Fall Freeze
November 4
50% probability date
Last Spring Freeze
April 1
50% probability date
Growing Season
217 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,691
Higher = more heating needed
Cooling Degree Days
2,313
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
What Mertzon's climate means for you
Mertzon runs 64°F a year - peaking in August, coldest in January.
- Gardeners get about 217 frost-free days, with the last spring freeze near April 1 - plan the planting calendar around it, not the regional average.
- Energy bills track 2,691 heating and 2,313 cooling degree days a year, higher means the furnace or AC runs more.
- Comparing places to live? Line this city up against nearby cities and the national rankings. See rankings
These are 30-year NOAA normals (1991–2020) - the typical year, not a forecast for any specific season.
Climate Guides
Climate Insight: Mertzon, TX
An annual average temperature of 64°F, ranging from a mean daily high of 78°F to a mean daily low of 50°F is what the NOAA 1991–2020 climate normals report for Mertzon, Texas. August is typically the warmest month of the year, while January is the coldest. That baseline comes from station USC00415861 and thirty years of averaging, so it reflects a typical month rather than any one year's swings.
Rainfall (and snow, where it falls) shapes day-to-day life here as much as temperature does. Mertzon sees about 21.6 inches of precipitation a year, predominantly as rainfall. The frost-free season averages 217 days, which directly shapes the planting calendar and growing potential for the area, with the last spring freeze near April 1 and the first fall freeze near November 4. On the energy side, 2,691 heating degree days and 2,313 cooling degree days tell the story of how often furnaces and air conditioners run during a normal year.
On PlainClimate's composite comfort index, Mertzon scores 88/100 (Excellent), a blended measure that weighs temperature mildness, precipitation moderation, and extreme-weather frequency against one another. The monthly tables above are the practical planning tool: mild highs and lows land in the shoulder seasons, August-driven heat peaks in summer, and January-driven cold sets in over deep winter. These are thirty-year averages, not a forecast - any single year can run warmer, wetter, drier, or cooler than the normal.
Frequently Asked Questions
What is the average temperature in Mertzon, TX? ▼
The average annual temperature in Mertzon, Texas is 64°F. The warmest month averages 95°F (35°C) and the coldest averages 29°F (-1°C).
How much rain does Mertzon get? ▼
Mertzon receives 21.6 inches of precipitation annually. Based on NOAA 30-year climate normals (1991-2020).
What is the comfort score for Mertzon? ▼
Mertzon has a climate comfort score of 88/100 (Excellent), milder than 92% of U.S. cities in the PlainClimate database.
When is the growing season in Mertzon? ▼
Mertzon has approximately 217 frost-free days per year, with the last spring freeze around April 1 and the first fall freeze around November 4.
How much energy does heating and cooling require in Mertzon? ▼
Mertzon has 2,691 heating degree days and 2,313 cooling degree days annually, a fairly balanced heating/cooling split. See our <a href="/guides/reading-weather-data/" class="underline hover:text-brand-600">guide to reading weather data</a> for what these figures mean.
Where does this Mertzon climate data come from? ▼
NOAA U.S. Climate Normals v1.0.1 (1991-2020), from weather station USC00415861 near Mertzon.
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). Station: USC00415861. For informational purposes only.
Read our methodology - how this data is sourced, computed, and verified.
Related
Data sourced from official public datasets. See our methodology for details. Retrieved and formatted by PlainClimate Editorial
Every figure on PlainClimate is rendered directly from NOAA 1991-2020 U.S. Climate Normals data, no number is typed in by an editor. This page draws directly on NOAA 1991-2020 U.S. Climate Normals data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.