Summerlin South reaches 100° on about 61 days a year, more than all but 126 U.S. towns
The depth of winter brings overnight lows near 35°. Its yearly precipitation falls short of almost every U.S. town. Warming shows here too: 1.8° more than in 1901–2000, led by January. Tender plants can go out after about January 24; in half of years the first frost comes by December 10.
A year in Summerlin South at a glance
Each month’s typical high and low, and what it brings.
What stands out about Summerlin South’s climate
Compared with towns across the U.S., with Summerlin South’s place in Nevada beside it.
What a year in Summerlin South feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 323 frost-free days a year
In half of years the last 32° night comes by January 24 and the first by December 10. Day counts come from NOAA’s station at Desert Nwr, NV, 22 miles from the town’s center, at about the same height; frost dates and degree days from Las Vegas Air Terminal, NV, 10 miles away.
The 2023 USDA map puts Summerlin South’s center in zone 9a: the coldest night of a typical winter, averaged over 1991–2020, reaches about 23°. 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 5 inches of rain a year
February is the wettest month and June the driest. Rain falls on about 29 days a year. Snow is rare: about 0.2" in a normal year at Las Vegas Wfo, NV, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Summerlin South
37% of the work is heating, so air conditioning is the bigger bill. Months averaging under 55° run from November 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 Las Vegas Air Terminal, NV.
Living with Summerlin South’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
323 frost-free days in zone 9a. The last frost comes by Jan 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 Dec 10.
Months with highs of 62–84° and lows of 40° or more: March, April, October and November. 32 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Summerlin South from natural hazards, river flooding is the largest share (62%); heat waves, cold waves, winter storms and ice storms together are 27%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Summerlin South and its neighbors
Las Vegas the hottest July afternoons (104°, 2° warmer). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Summerlin South’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 |
|---|---|---|---|---|
| Summerlin South, NV | 35° | 102° | 5" | 0.2" |
| California City, CA | 35° | 100° | 7" | 2.2" |
| Wickenburg, AZ | 36° | 103° | 11" | 0.1" |
| Monahans, TX | 30° | 98° | 12" | 0.7" |
| Sunland Park, NM | 32° | 96° | 9" | 2.0" |
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value. Snow and frost-free days come from the nearest weather station, so neighbors often share them.
Warmer than it used to be
The last 30 years in Summerlin South averaged 1.8° warmer than the 1900s. The biggest change is in January (+2.9°).
A bigger shift than in 80% 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 Summerlin South compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Summerlin South’s place among Nevada’s.
Summerlin South weather by month
Highs, lows and precipitation from NOAA’s grid at Summerlin South’s center; snow, wet days and snow on the ground from Las Vegas Wfo, NV. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 57° | 35° | 0.7" | 0.0" | 3 | 0 | 42° – 53° |
| February | 61° | 38° | 0.9" | 0.0" | 4 | 0 | 43° – 57° |
| March | 69° | 45° | 0.5" | 0.0" | 3 | 0 | 50° – 63° |
| April | 76° | 51° | 0.2" | 0.0" | 2 | 0 | 57° – 68° |
| May | 86° | 59° | 0.1" | 0.0" | 1 | 0 | 66° – 79° |
| June | 97° | 69° | 0.1" | 0.0" | 1 | 0 | 76° – 88° |
| July | 102° | 75° | 0.4" | 0.0" | 3 | 0 | 85° – 92° |
| August | 100° | 74° | 0.5" | 0.0" | 3 | 0 | 84° – 90° |
| September | 93° | 65° | 0.3" | 0.0" | 2 | 0 | 76° – 83° |
| October | 80° | 53° | 0.4" | 0.0" | 2 | 0 | 62° – 73° |
| November | 66° | 41° | 0.3" | 0.0" | 2 | 0 | 46° – 59° |
| December | 56° | 34° | 0.6" | 0.2" | 3 | 0 | 41° – 49° |
| Year | 78° | 53° | 4.9" | 0.2" | 29 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 43° to 57°. August is the most reliable, staying within 7°.
Where Summerlin South’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 Summerlin South’s center.
- Snow: Las Vegas Wfo, NV.
- Frost dates, heating and cooling: Las Vegas Air Terminal, NV, 10 miles away.
- Freezing nights, 90° and 100° days: Desert Nwr, NV, 22 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 Summerlin South’s climate
What is the weather like in Summerlin South?
A typical July afternoon reaches 102°, a January night drops to 35°, and snow is almost unheard of. Milder January nights than 81% of U.S. towns; hotter July afternoons than all but 101 U.S. towns.
How cold does it get in Summerlin South in winter?
December nights average 34°. About 60 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 41°.
How much snow does Summerlin South get?
About 0.2 inches in a normal winter at Las Vegas Wfo, NV, so most winters see none.
How hot does it get in Summerlin South?
July, with a typical high of 102° and a low of 75°. About 128 days a year reach 90° and 61 reach 100° (Las Vegas Air Terminal, NV).
When is the first and last frost in Summerlin South?
In half of years the last spring frost (32°) comes by January 24 and the first fall frost by December 10, about 323 frost-free days, at Las Vegas Air Terminal, NV.
What growing zone is Summerlin South in?
Zone 9a on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 23°.
What is the best time of year to visit Summerlin South?
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 Summerlin South getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 80% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Summerlin South.
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.