Dennis reaches 100° on about 25 days a year, more than 97% of U.S. towns
The coldest hours of a January night bottom out at 33° on average. By precipitation alone, it ranks drier than 81% of U.S. towns. January has warmed most since 1901–2000, part of a 0.6° rise. Warm coats and heating bills mark the months from December to February, when means dip under 50°.
A year in Dennis at a glance
Each month’s typical high and low, and what it brings.
What stands out about Dennis’ climate
Compared with towns across the U.S., with Dennis’ place in Texas beside it.
What a year in Dennis feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 228 frost-free days a year
In half of years the last 32° night comes by March 24 and the first by November 9. Frost and day counts come from NOAA’s station at Granbury 5n, TX, 10 miles from the town’s center, at about the same height.
The 2023 USDA map puts Dennis’ center in zone 8a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 15°. Plant labels use the zone; frost dates tell you when to plant.
Freezing nights by month
Average nights at or below 32°
90° days by month
Average days at 90° or more
About 33 inches of rain a year
May is the wettest month and January the driest. Rain falls on about 44 days a year. Snow is rare: about 0.5" in a normal year at Lipan 4nw, TX, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Dennis
50% of the work is heating. Months averaging under 55° run from December through February.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Granbury 5n, TX.
Living with Dennis’ climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
228 frost-free days in zone 8a. The last frost comes by Mar 24 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Nov 9.
Months with highs of 62–84° and lows of 40° or more: March, April, October and November.
Parks & trails →Of the yearly building losses FEMA expects in Dennis from natural hazards, river flooding is the largest share (35%); heat waves, cold waves, winter storms and ice storms together are 15%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Dennis and similar climates
TownRatings has no climate map of the towns around Dennis yet.
Climates most like Dennis’, farther away
TownRatings’ own comparison of NOAA 1991–2020 normals, not a NOAA product: places of 5,000+ at least 150 miles away, one per state, closest on January low, July high, precipitation and snow.
| Town | Jan. low | July high | Precip. | Snow |
|---|---|---|---|---|
| Dennis, TX | 33° | 96° | 33" | 0.5" |
| Oakhurst, CA | 34° | 95° | 29" | 2.5" |
| Anadarko, OK | 27° | 95° | 33" | 2.3" |
| Grants Pass, OR | 34° | 90° | 33" | 0.9" |
| Cayce, SC | 35° | 93° | 46" | 1.2" |
Temperatures and precipitation come from NOAA’s 5 km grid; snow and day counts from the stations named on this page.
Warmer than it used to be
The last 30 years in Dennis averaged 0.6° warmer than the 1900s. The biggest change is in January (+1.9°).
A smaller shift than in 97% of U.S. towns.
Change by month
The two periods overlap (1991–2000 is in both), which makes the gap a little smaller than it would be between separate periods.
How Dennis compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Dennis’ place among Texas’.
Dennis weather by month
Highs, lows and precipitation from NOAA’s grid at Dennis’ center; snow, wet days and snow on the ground from Lipan 4nw, TX. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 58° | 33° | 1.9" | 0.0" | 3 | 0 | 41° – 53° |
| February | 62° | 37° | 2.2" | 0.1" | 3 | 0 | 41° – 58° |
| March | 70° | 45° | 3.0" | 0.0" | 4 | 0 | 52° – 63° |
| April | 78° | 53° | 2.9" | 0.0" | 4 | 0 | 61° – 71° |
| May | 85° | 62° | 4.1" | 0.0" | 5 | 0 | 70° – 79° |
| June | 92° | 70° | 3.8" | 0.0" | 4 | 0 | 78° – 86° |
| July | 96° | 73° | 1.9" | 0.0" | 3 | 0 | 80° – 90° |
| August | 97° | 72° | 2.5" | 0.0" | 4 | 0 | 78° – 91° |
| September | 89° | 65° | 3.1" | 0.0" | 4 | 0 | 73° – 84° |
| October | 79° | 54° | 3.5" | 0.0" | 4 | 0 | 61° – 71° |
| November | 68° | 43° | 2.4" | 0.4" | 3 | 0 | 50° – 61° |
| December | 60° | 35° | 2.1" | 0.0" | 3 | 0 | 40° – 51° |
| Year | 78° | 53° | 33.2" | 0.5" | 44 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 41° to 58°. June is the most reliable, staying within 9°.
Where Dennis’ numbers come from
Normals are 30-year averages, not a forecast. How TownRatings reads climate data →
- Temperatures and precipitation: NOAA’s gridded 1991–2020 normals for the 5 km cell at Dennis’ center.
- Snow: Lipan 4nw, TX.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Granbury 5n, TX, 10 miles from the town’s center, at about the same height; the nearest station that passes our checks for distance, height and agreement with the grid.
- Growing zone: USDA Plant Hardiness Zone Map, 2023. USDA Agricultural Research Service and PRISM Group, Oregon State University, prism.oregonstate.edu/phzm, accessed 8 Oct 2026.
- Then and now: NOAA’s gridded normals for 1901–2000 at the same cell.
- Storms and extremes: FEMA National Risk Index (expected annual losses to buildings).
Common questions about Dennis’ climate
What is the weather like in Dennis?
A typical July afternoon reaches 96°, a January night drops to 33°, and snow is almost unheard of. Milder January nights than 77% of U.S. towns; hotter July afternoons than 97% of U.S. towns.
How cold does it get in Dennis in winter?
January nights average 33°. About 58 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 41°.
How much snow does Dennis get?
About 0.5 inches in a normal winter at Lipan 4nw, TX, so most winters see none.
How hot does it get in Dennis?
July, with a typical high of 96° and a low of 73°. About 104 days a year reach 90° and 25 reach 100° (Granbury 5n, TX).
When is the first and last frost in Dennis?
In half of years the last spring frost (32°) comes by March 24 and the first fall frost by November 9, about 228 frost-free days, at Granbury 5n, TX.
What growing zone is Dennis in?
Zone 8a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 15°.
What is the best time of year to visit Dennis?
By one simple rule (highs of 62–84° and lows of 40° or more), March, April, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Dennis getting warmer?
Yes: 1991–2020 averaged 0.6° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 97% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Dennis.
Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000; USDA/PRISM 2023 hardiness zones; FEMA National Risk Index. Today’s forecast: National Weather Service.