Mt Vernon, TX Climate: Temperature & Rain by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Mt Vernon's primary NOAA station, MT VERNON.
The climate verdict for Mt Vernon
Water is the standout signal in Mt Vernon, Texas: 48.2 inches of precipitation in a normal year. Against that wet profile, NOAA records an annual average of 65°F. It scores 97/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 97% of them.
- 65°F
- annual average temperature (NOAA normal)
- 97/100
- comfort score, above 97% of station-mapped location scores
- 48.2"
- annual precipitation · 2" snow
- 246 days
- frost-free days per growing season
Mt Vernon: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00416119 · Mt Vernon, TX 65°F mean · 48.2" precip
TEMP-MILD · RANK-UPPER · PHOTO-FINISH · PRCP-MID · SWING-MID · COMF-TOP · LOAD-MIX · STN-1 · BOOK-FULL
- TEMP-MILD 65°F
- RANK-UPPER #5,969
- PHOTO-FINISH ≈ Cooper Dam
- PRCP-MID 48.2"
- SWING-MID 39°F
- COMF-TOP 97/100
- LOAD-MIX H/C balanced
- STN-1 USC00416119
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Cooper Dam, TX (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every TX station list.
- Mt Vernon (this station) 65°F
- Hot Junction, TX 65°F
- Near Cooper Dam, TX 65°F
- Near Hallsville, TX 65°F
- Near Jamestown, SC 65°F
Mt Vernon sits in Texas, the #4 hottest U.S. state at 66.2°F statewide annual average - see all 50 hottest states ranked by NOAA normals
Climate Living Index · Mt Vernon
Mt Vernon: 79/100 · grade B
Mt Vernon publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Mt Vernon, not an official NOAA rating. Rankings still use Comfort Score 97/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 64.6°F · 2.9° from 67.5°F | 91/100 · A |
| Frost-free season | 246 days/year | 87/100 · A |
| Normal heat + freeze calendar | 87 calendar days | 80/100 · B |
| Snowfall burden | 1.6 inches/year | 79/100 · B |
| Precipitation balance | 48.2 in · 13.2 from 35 in | 54/100 · D |
Mt Vernon · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Mt Vernon is a temperate Köppen climate: Cfa
Coldest-month mean 44.9°F and warmest-month mean 83.5°F place this station in temperate, no dry season, hot summer climates (Cfa). Class Cfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, hot summer.
- Köppen code
- Cfa
- Group
- Temperate
- Warmest month
- 83.5°F
- Coldest month
- 44.9°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · balanced station
Where Mt Vernon sits across the climate record
Three NOAA fields for Mt Vernon's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 13% warmest
- Among 6,861 stations, Mt Vernon sits in the warmer third of annual means.
- Annual precipitation
- Top 24% wettest
- Mt Vernon's annual total ranks in the wetter third of 6,352 measured normals.
- Seasonal temperature swing
- Narrower than 70%
- Warmest-to-coldest month gap for Mt Vernon is compact versus 6,861 complete station-years.
How Mt Vernon compares across U.S. station-mapped locations
Mt Vernon's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
97 Top 3% score exceeds 97% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). Below this entry.
- 90–100: 564 station-mapped locations (9%). This entry sits in this band.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Mt Vernon's measured station temperature trend
MethodologyAcross 49 complete annual observations from 1967 to 2025, MT VERNON warmed at a fitted rate of 0.18°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Mt Vernon primary station fitted change +0.18 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 56°F (13°C) | 34°F (1°C) | 45°F (7°C) | 3.4" | 0.5" | 13.6 | 0.0 |
| February | 60°F (16°C) | 38°F (3°C) | 49°F (9°C) | 3.7" | 0.9" | 8.6 | 0.0 |
| March | 68°F (20°C) | 45°F (7°C) | 56°F (13°C) | 4.5" | 0.1" | 2.8 | 0.1 |
| April | 76°F (24°C) | 52°F (11°C) | 64°F (18°C) | 4.1" | 0.0" | 0.3 | 0.4 |
| May | 82°F (28°C) | 61°F (16°C) | 72°F (22°C) | 5.1" | 0.0" | 0.0 | 3.6 |
| June | 90°F (32°C) | 69°F (21°C) | 80°F (27°C) | 4.2" | 0.0" | 0.0 | 15.8 |
| July | 94°F (35°C) | 73°F (23°C) | 84°F (29°C) | 3.2" | 0.0" | 0.0 | 25.0 |
| August | 95°F (35°C) | 72°F (22°C) | 83°F (29°C) | 3.1" | 0.0" | 0.0 | 23.9 |
| September | 88°F (31°C) | 65°F (18°C) | 76°F (25°C) | 3.6" | 0.0" | 0.0 | 13.1 |
| October | 77°F (25°C) | 54°F (12°C) | 66°F (19°C) | 4.7" | 0.0" | 0.2 | 2.3 |
| November | 66°F (19°C) | 44°F (7°C) | 55°F (13°C) | 3.9" | 0.0" | 4.6 | 0.0 |
| December | 58°F (14°C) | 36°F (2°C) | 47°F (8°C) | 4.7" | 0.1" | 10.9 | 0.0 |
The year, day by day
The year in Mt Vernon runs from a mild 34°F around January 7 to 96°F at the peak near August 2, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from June 15 through September 9, covering 87 dates. The broader mild season, normal highs of 70°F or more, runs March 22 to November 3.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 34°F around January 7.
Where the wet dates fall
The likeliest wet date is February 26, when 29% of years recorded at least a hundredth of an inch. The driest is July 22 at 18%. Summed across the calendar, that is about 90 wet dates a year.
The widest day
April 3 carries the biggest normal gap between afternoon and dawn, 25°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Mt Vernon.
Where Mt Vernon Stands Nationally
Heat is a defining feature of the normals calendar — the normal daily high reaches 90°F on roughly 87 days a year, more than four out of five ranked stations record.
Mt Vernon earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall and snowfall
Snow: 0.5"
8.2 days with precipitation
Snow: 0.9"
8.4 days with precipitation
Snow: 0.1"
8.9 days with precipitation
7.9 days with precipitation
9.1 days with precipitation
7.5 days with precipitation
5.9 days with precipitation
5.7 days with precipitation
6.4 days with precipitation
7.0 days with precipitation
7.1 days with precipitation
Snow: 0.1"
8.1 days with precipitation
Mt Vernon spreads its precipitation across the year
Neither half of the year dominates here: June through August take 22% of the annual total and December through February 25%, with neither reaching the 35% that would mark a distinct wet season. Mt Vernon has no dry season to plan around, though it does carry a 38.6°F seasonal spread.
The gap between the wettest and driest month still matters: May averages 5.1" and August 3.1". The three wettest months together take 30% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
When it rains in Mt Vernon, it arrives in quantity
48.2" of precipitation falls across only about 90 wet days here, averaging 0.53 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 90 a year, 25% of all days
- Average depth per wet day
- 0.53 inches
- Most wet days
- May, about 9
- Fewest wet days
- August, about 6
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Snow reaches Mt Vernon, but rarely amounts to much
The normals record 1.6 inches of snow a year here, most likely in February. That is a real but marginal amount: enough that snow is part of the local record, not enough to define the winter.
A figure in this range usually reflects a handful of events that melt quickly rather than a season of accumulation; about 1 days a year record any measurable snow at all.
NOAA 1991-2020 normals. An average across thirty years can smooth away a single heavy winter, so a small annual figure does not mean a significant snowfall is impossible.
Frost Dates & Growing Season
First Fall Freeze
November 16
50% probability date
Last Spring Freeze
March 15
50% probability date
Growing Season
246 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
2,511
Higher = more heating needed
Cooling Degree Days
2,413
Higher = more cooling needed
Warmest Month
July
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside TX closest to Mt Vernon on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (65°F here).
- Jamestown, SC 65°F · 0.0°F off
- Lake Providence, LA 65°F · 0.0°F off
- Many, LA 65°F · 0.0°F off
- Ardmore, OK 65°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (48.2" here), excluding temperature-peer places.
- Milledgeville, GA 48.2" · 0.0" off
- Nashua, NH 48.2" · 0.0" off
- Waynesboro, GA 48.2" · 0.0" off
- Charlottesville, VA 48.2" · 0.0" off
Data-derived climate profile
How Mt Vernon's climate pattern fits together
mixed demand · wet · mid swing
Water is prominent even though neither heating nor cooling wholly defines the record. Mt Vernon averages 48.2 inches of precipitation a year. Annual snowfall totals 1.6 inches. The monthly table supplies the seasonal distribution hidden by that annual total.
July and January mark the typical warm and cold ends of the calendar in Mt Vernon's middle-range seasonal profile. The measured spread is 38.6°F. The annual average is 65°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Heating and cooling both register in Mt Vernon's normal, at 2,511 and 2,413 degree days respectively. Neither total exceeds the other by more than two to one, so the record is better read as a mixed-demand calendar than as heating-led or cooling-led.
The frost-free window extends for about 246 days. That is a long calendar measure, but it is not a forecast and does not combine heat, rainfall, soil, or local elevation into a planting recommendation.
These labels group NOAA 1991-2020 normals from Mt Vernon's primary station, where heating and cooling demand are close enough that neither season sets the character on its own. On a balanced station like Mt Vernon, the bands are descriptive ranges rather than an official NOAA classification or a forecast.
Questions about Mt Vernon's climate
How much rain does Mt Vernon get? ▼
How many days above 90°F does Mt Vernon get? ▼
How much energy does heating and cooling require in Mt Vernon? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Mt Vernon's primary station: MT VERNON (USC00416119). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Mt Vernon; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Mt Vernon comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.