Photo: Renelibrary · CC BY-SA 4.0Dilley reaches 100° on about 29 days a year, more than 97% of U.S. towns
January mornings start at about 41°. Winter and summer sit 57° apart. Winters are mild: January nights here are milder than in 90% of U.S. towns. The frost-free window for a garden runs roughly February 16 to December 6.
A year in Dilley at a glance
Each month’s typical high and low, and what it brings.
What stands out about Dilley’s climate
Compared with towns across the U.S., with Dilley’s place in Texas beside it.
What a year in Dilley feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 296 frost-free days a year
In half of years the last 32° night comes by February 16 and the first by December 6. Frost and day counts come from NOAA’s station at Dilley, TX, 1.0 miles from the town’s center, at about the same height.
The 2023 USDA map puts Dilley’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 25°. 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 23 inches of rain a year
September is the wettest month and January the driest. Rain falls on about 61 days a year. Snow is rare: about 0.2" in a normal year at Dilley, TX, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Dilley
26% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55° run from January.
Degree days add up how far each day’s average falls below (heating) or rises above (cooling) 65° over a year. NOAA normals at Dilley, TX.
Living with Dilley’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
296 frost-free days in zone 9a. The last frost comes by Feb 16 in half of years, so many gardeners wait a week or two past that to set out tomatoes. The first fall frost comes by Dec 6.
Months with highs of 62–84° and lows of 40° or more: January, February, March, November and December. 0.0 miles of trails are waiting.
Parks & trails →Cold waves are 34% of the yearly building losses FEMA expects in Dilley from natural hazards, the largest share. Normals are averages; the hazards page covers the extremes.
Natural hazards →Dilley and similar climates
TownRatings has no climate map of the towns around Dilley yet.
Climates most like Dilley’s, 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 |
|---|---|---|---|---|
| Dilley, TX | 41° | 98° | 23" | 0.2" |
| Red Bluff, CA | 39° | 98° | 25" | 0.1" |
| Vail, AZ | 36° | 97° | 14" | 0.1" |
| Altus, OK | 28° | 97° | 28" | 2.8" |
| Ivins, UT | 32° | 100° | 11" | 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 Dilley averaged 1.0° warmer than the 1900s. The biggest change is in February (+2.4°).
A smaller shift than in 75% 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 Dilley compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Dilley’s place among Texas’.
Dilley weather by month
Highs, lows and precipitation from NOAA’s grid at Dilley’s center; snow, wet days and snow on the ground from Dilley, TX. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 66° | 41° | 1.2" | 0.0" | 5 | 0 | 49° – 60° |
| February | 71° | 46° | 1.2" | 0.0" | 5 | 0 | 51° – 67° |
| March | 78° | 53° | 1.8" | 0.0" | 6 | 0 | 58° – 71° |
| April | 85° | 59° | 1.7" | 0.0" | 4 | 0 | 65° – 78° |
| May | 91° | 67° | 2.9" | 0.0" | 6 | 0 | 74° – 83° |
| June | 96° | 72° | 2.4" | 0.0" | 5 | 0 | 80° – 88° |
| July | 98° | 73° | 2.2" | 0.0" | 4 | 0 | 80° – 89° |
| August | 99° | 73° | 1.9" | 0.0" | 4 | 0 | 83° – 89° |
| September | 92° | 69° | 3.1" | 0.0" | 7 | 0 | 77° – 86° |
| October | 85° | 60° | 2.1" | 0.0" | 5 | 0 | 70° – 78° |
| November | 75° | 50° | 1.3" | 0.0" | 5 | 0 | 57° – 68° |
| December | 67° | 43° | 1.3" | 0.2" | 6 | 0 | 48° – 59° |
| Year | 84° | 59° | 23.0" | 0.2" | 61 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 51° to 67°. August is the most reliable, staying within 7°.
Where Dilley’s 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 Dilley’s center.
- Snow: Dilley, TX (NOAA station in town).
- Frost, freezing nights, 90° and 100° days, heating and cooling: Dilley, TX, 1.0 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 Dilley’s climate
What is the weather like in Dilley?
A typical July afternoon reaches 98°, a January night drops to 41°, and snow is almost unheard of. Milder January nights than 90% of U.S. towns; hotter July afternoons than 98% of U.S. towns.
How cold does it get in Dilley in winter?
January nights average 41°. About 10 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 49°.
How much snow does Dilley get?
About 0.2 inches in a normal winter at Dilley, TX, so most winters see none.
How hot does it get in Dilley?
July, with a typical high of 98° and a low of 73°. About 140 days a year reach 90° and 29 reach 100° (Dilley, TX).
When is the first and last frost in Dilley?
In half of years the last spring frost (32°) comes by February 16 and the first fall frost by December 6, about 296 frost-free days, at Dilley, TX.
What growing zone is Dilley in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 25°.
What is the best time of year to visit Dilley?
By one simple rule (highs of 62–84° and lows of 40° or more), January, February, March, November and December. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Dilley getting warmer?
Yes: 1991–2020 averaged 1.0° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 75% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Dilley.
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.