Round Mountain reaches 100° on about 17 days a year, more than 94% of U.S. towns
January nights here settle around 38°. Winters are mild: January nights here are milder than in 85% of U.S. towns. Decade by decade the climate has edged up, 0.9° above 1901–2000. Comfortable outdoor weather lasts from February to April and October to November, with highs of 65–80°.
A year in Round Mountain at a glance
Each month’s typical high and low, and what it brings.
What stands out about Round Mountain’s climate
Compared with towns across the U.S., with Round Mountain’s place in Texas beside it.
What a year in Round Mountain feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 235 frost-free days a year
In half of years the last 32° night comes by March 22 and the first by November 9. Frost and day counts come from NOAA’s station at Johnson City 2n, TX, 7 miles from the town’s center, 190 ft lower.
The 2023 USDA map puts Round Mountain’s center in zone 8b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 18°. 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 32 inches of rain a year
May is the wettest month and February the driest. Rain falls on about 80 days a year. Snow is rare: about 0.2" in a normal year at Johnson City 2n, TX, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Round Mountain
42% of the work is heating, so air conditioning is the bigger bill. 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 Johnson City 2n, TX.
Living with Round Mountain’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
235 frost-free days in zone 8b. The last frost comes by Mar 22 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: February, March, April, October and November.
Parks & trails →Of the yearly building losses FEMA expects in Round Mountain from natural hazards, river flooding is the largest share (58%); heat waves, cold waves, winter storms and ice storms together are 6%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Round Mountain and similar climates
TownRatings has no climate map of the towns around Round Mountain yet.
Climates most like Round Mountain’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 |
|---|---|---|---|---|
| Round Mountain, TX | 38° | 95° | 32" | 0.2" |
| Jackson, CA | 38° | 94° | 30" | 0.0" |
| Grants Pass, OR | 34° | 90° | 33" | 0.9" |
| Lone Grove, OK | 31° | 94° | 39" | 2.7" |
| Lugoff, SC | 33° | 92° | 43" | 0.4" |
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 Round Mountain averaged 0.9° warmer than the 1900s. The biggest change is in March (+1.9°).
A smaller shift than in 83% 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 Round Mountain compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Round Mountain’s place among Texas’.
Round Mountain weather by month
Highs, lows and precipitation from NOAA’s grid at Round Mountain’s center; snow, wet days and snow on the ground from Johnson City 2n, TX. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 61° | 38° | 2.0" | 0.1" | 7 | 0 | 44° – 56° |
| February | 65° | 42° | 1.9" | 0.1" | 8 | 0 | 45° – 61° |
| March | 72° | 49° | 2.7" | 0.0" | 8 | 0 | 53° – 66° |
| April | 79° | 55° | 2.6" | 0.0" | 6 | 0 | 61° – 73° |
| May | 85° | 64° | 4.4" | 0.0" | 8 | 0 | 70° – 79° |
| June | 91° | 70° | 3.1" | 0.0" | 7 | 0 | 76° – 85° |
| July | 95° | 72° | 2.0" | 0.0" | 5 | 0 | 79° – 87° |
| August | 95° | 72° | 2.3" | 0.0" | 5 | 0 | 79° – 89° |
| September | 89° | 66° | 3.6" | 0.0" | 7 | 0 | 74° – 83° |
| October | 80° | 57° | 3.5" | 0.0" | 7 | 0 | 66° – 74° |
| November | 70° | 47° | 2.5" | 0.0" | 6 | 0 | 53° – 64° |
| December | 62° | 39° | 2.0" | 0.0" | 6 | 0 | 44° – 55° |
| Year | 79° | 56° | 32.4" | 0.2" | 80 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 45° to 61°. July is the most reliable, staying within 8°.
Where Round Mountain’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 Round Mountain’s center.
- Snow: Johnson City 2n, TX.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Johnson City 2n, TX, 7 miles from the town’s center, 190 ft lower; 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 Round Mountain’s climate
What is the weather like in Round Mountain?
A typical July afternoon reaches 95°, a January night drops to 38°, and snow is almost unheard of. Milder January nights than 85% of U.S. towns; hotter July afternoons than 94% of U.S. towns.
How cold does it get in Round Mountain in winter?
January nights average 38°. About 42 nights a year reach 32° or below. In the coldest January of the last 30 years the month averaged 44°.
How much snow does Round Mountain get?
About 0.2 inches in a normal winter at Johnson City 2n, TX, so most winters see none.
How hot does it get in Round Mountain?
July, with a typical high of 95° and a low of 72°. About 111 days a year reach 90° and 17 reach 100° (Johnson City 2n, TX).
When is the first and last frost in Round Mountain?
In half of years the last spring frost (32°) comes by March 22 and the first fall frost by November 9, about 235 frost-free days, at Johnson City 2n, TX.
What growing zone is Round Mountain in?
Zone 8b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 18°.
What is the best time of year to visit Round Mountain?
By one simple rule (highs of 62–84° and lows of 40° or more), February, March, April, October and November. The rule is ours, not NOAA’s; the month table has the numbers to judge by.
Is Round Mountain getting warmer?
Yes: 1991–2020 averaged 0.9° warmer than 1901–2000 on NOAA’s grid. A smaller shift than 83% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Round Mountain.
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.