Somerville Dam, TX Climate: Temperature & Rain by Month
Average temperature and precipitation from NOAA NCEI 1991–2020 normals →, with a derived climate comfort score
30-year climate normals (1991-2020) from Somerville Dam's primary NOAA station, SOMERVILLE DAM.
The climate verdict for Somerville Dam
Somerville Dam, Texas has a mixed annual climate rather than one dominant extreme. Its NOAA normal shows an annual average of 67°F. It scores 93/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 93% of them.
- 67°F
- yearly average temperature, NOAA normal
- 93/100
- comfort score, above 93% of station-mapped location scores
- 41.0"
- annual precipitation
- 236 days
- frost-free growing season
Somerville Dam: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00418446 · Somerville Dam, TX 67°F mean · 41.0" precip
TEMP-MILD · RANK-WARM · PHOTO-FINISH · PRCP-MID · SWING-MID · COMF-TOP · LOAD-MIX · STN-1 · BOOK-FULL
- TEMP-MILD 67°F
- RANK-WARM #6,312
- PHOTO-FINISH ≈ Corsicana Campb…
- PRCP-MID 41.0"
- SWING-MID 35°F
- COMF-TOP 93/100
- LOAD-MIX H/C balanced
- STN-1 USC00418446
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Corsicana Campbell Fld, 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.
- Somerville Dam (this station) 67°F
- Hot Donalsonville, GA 67°F
- Near Corsicana Campb…, TX 67°F
- Near Covington, LA 67°F
- Near Crestview Bob S…, FL 67°F
Somerville Dam 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 · Somerville Dam
Somerville Dam: 81/100 · grade B
Somerville Dam publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Somerville Dam, not an official NOAA rating. Rankings still use Comfort Score 93/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Annual temperature balance | 67.0°F · 0.5° from 67.5°F | 96/100 · A |
| Snowfall burden | 0.0 inches/year | 90/100 · A |
| Frost-free season | 236 days/year | 83/100 · B |
| Precipitation balance | 41.0 in · 6.0 from 35 in | 79/100 · B |
| Normal heat + freeze calendar | 121 calendar days | 64/100 · C |
Somerville Dam · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Somerville Dam is a temperate Köppen climate: Cfa
Coldest-month mean 48.6°F and warmest-month mean 83.9°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
- 83.9°F
- Coldest month
- 48.6°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 Somerville Dam sits across the climate record
Three NOAA fields for Somerville Dam's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 8% warmest
- Among 6,861 stations, Somerville Dam sits in the warmer third of annual means.
- Annual precipitation
- 60th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 81%
- Warmest-to-coldest month gap for Somerville Dam is compact versus 6,861 complete station-years.
How Somerville Dam compares across U.S. station-mapped locations
Somerville Dam's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
93 Top 7% score exceeds 93% 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
Somerville Dam's measured station temperature trend
MethodologyAcross 33 complete annual observations from 1968 to 2015, SOMERVILLE DAM changed little at a fitted rate of 0.00°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Somerville Dam primary station fitted change -0.00 °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 | 62°F (17°C) | 35°F (2°C) | 49°F (9°C) | 3.2" | 0.0" | 12.7 | 0.0 |
| February | 66°F (19°C) | 39°F (4°C) | 52°F (11°C) | 2.9" | 0.0" | 6.7 | 0.1 |
| March | 73°F (23°C) | 46°F (8°C) | 59°F (15°C) | 3.2" | 0.0" | 2.7 | 0.1 |
| April | 80°F (27°C) | 53°F (12°C) | 66°F (19°C) | 3.3" | 0.0" | 0.3 | 1.3 |
| May | 87°F (31°C) | 62°F (16°C) | 74°F (23°C) | 4.7" | 0.0" | 0.0 | 11.1 |
| June | 93°F (34°C) | 68°F (20°C) | 81°F (27°C) | 3.9" | 0.0" | 0.0 | 24.5 |
| July | 97°F (36°C) | 70°F (21°C) | 84°F (29°C) | 1.9" | 0.0" | 0.0 | 29.2 |
| August | 98°F (37°C) | 70°F (21°C) | 84°F (29°C) | 2.8" | 0.0" | 0.0 | 29.1 |
| September | 92°F (33°C) | 64°F (18°C) | 78°F (26°C) | 3.4" | 0.0" | 0.0 | 22.0 |
| October | 83°F (29°C) | 53°F (12°C) | 68°F (20°C) | 4.3" | 0.0" | 0.2 | 7.6 |
| November | 72°F (22°C) | 44°F (7°C) | 58°F (15°C) | 3.5" | 0.0" | 3.7 | 0.2 |
| December | 64°F (18°C) | 37°F (3°C) | 51°F (10°C) | 3.6" | 0.0" | 10.6 | 0.0 |
The year, day by day
The year in Somerville Dam runs from a mild 34°F around January 4 to 99°F at the peak near August 7, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from May 27 through September 24, covering 121 dates. The broader mild season, normal highs of 70°F or more, runs March 6 to November 22.
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 4.
Where the wet dates fall
The likeliest wet date is December 22, when 32% of years recorded at least a hundredth of an inch. The driest is July 26 at 16%. Summed across the calendar, that is about 94 wet dates a year.
The widest day
October 18 carries the biggest normal gap between afternoon and dawn, 31°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Somerville Dam.
Where Somerville Dam Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 121 days a year the normal daily high itself reaches 90°F — a count fewer than one station in ten exceeds.
Somerville Dam 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
9.4 days with precipitation
9.0 days with precipitation
8.3 days with precipitation
7.1 days with precipitation
8.5 days with precipitation
7.6 days with precipitation
5.4 days with precipitation
5.9 days with precipitation
7.4 days with precipitation
7.1 days with precipitation
8.0 days with precipitation
9.9 days with precipitation
Somerville Dam spreads its precipitation across the year
Neither half of the year dominates here: June through August take 21% of the annual total and December through February 24%, with neither reaching the 35% that would mark a distinct wet season. Somerville Dam has no dry season to plan around, though it does carry a 35.3°F seasonal spread.
The gap between the wettest and driest month still matters: May averages 4.7" and July 1.9". The three wettest months together take 32% 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 Somerville Dam, it arrives in quantity
40.9" of precipitation falls across only about 94 wet days here, averaging 0.44 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 94 a year, 26% of all days
- Average depth per wet day
- 0.44 inches
- Most wet days
- December, about 10
- Fewest wet days
- July, about 5
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.
Somerville Dam's record shows no measurable snowfall
This station measured snowfall across the 1991-2020 period and recorded none: the annual normal is 0.0 inches. That is a measured zero rather than missing data, which is a meaningful distinction here , most stations in the database simply do not report snow at all, and those pages say nothing about it.
A thirty-year normal of zero describes the typical year at this station. It is not a claim that snow has never fallen in the area.
Frost Dates & Growing Season
First Fall Freeze
November 9
50% probability date
Last Spring Freeze
March 18
50% probability date
Growing Season
236 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
1,933
Higher = more heating needed
Cooling Degree Days
2,690
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside TX closest to Somerville Dam 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 (67°F here).
- Covington, LA 67°F · 0.0°F off
- Donalsonville, GA 67°F · 0.0°F off
- Waveland, MS 67°F · 0.0°F off
- Alexandria, LA 67°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (41.0" here), excluding temperature-peer places.
- Sussex, NJ 41.0" · 0.0" off
- Plainfield, VT 41.0" · 0.0" off
- Tulsa, OK 41.0" · 0.0" off
- Circleville, OH 40.9" · 0.0" off
Data-derived climate profile
How Somerville Dam's climate pattern fits together
mixed demand · moderate · mid swing
August and January mark the typical warm and cold ends of the calendar in Somerville Dam's middle-range seasonal profile. The measured spread is 35.3°F. The annual average is 67°F. Neither the annual mean nor one extreme month represents the full calendar on its own.
Heating and cooling both register in Somerville Dam's normal, at 1,933 and 2,690 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.
A roughly 236-day frost-free season sits inside this mixed heating-and-cooling profile. Start and end dates matter because both sides of the thermostat register during a normal year.
Somerville Dam's 41.0 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Recorded annual snowfall is negligible. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
These labels group NOAA 1991-2020 normals from Somerville Dam'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 Somerville Dam, the bands are descriptive ranges rather than an official NOAA classification or a forecast.
Questions about Somerville Dam's climate
How much rain does Somerville Dam get? ▼
How many days above 90°F does Somerville Dam get? ▼
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Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Somerville Dam's primary station: SOMERVILLE DAM (USC00418446). 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 Somerville Dam; 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 Somerville Dam 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.