Summerlin South in Winter
In winter (December, January and February), Summerlin South sees average daytime highs around 56°F and overnight lows near 38°F, with 2.7 in of precipitation over about 11 wet days across the season. It is the coldest season of the year and the wettest season of the year.
Over the season highs climb from about 56°F in early December to 61°F by late February. The sky is clear or mostly clear about 54% of the time across winter, and the air most often feels dry.
Winter is Summerlin South's 3rd-best season to visit on our travel score. For the whole year in context, see Summerlin South's year-round climate.
- Avg daytime high
- 56°F
- coldest season of the year
- Avg overnight low
- 38°F
- Precipitation
- 2.7 in
- 11 wet days
- Avg wind
- 4 mph
- Travel score
- 4.6
- 3rd-best season
- Months
- Dec · Jan · Feb
Temperature in Summerlin South in Winter
Over the season highs climb from about 56°F in early December to 61°F by late February.
A typical winter day in Summerlin South reaches about 56°F and drops to 38°F overnight. The warmest of the three months is February, the coolest December.
How winter really feels in Summerlin South
Once humidity and wind are folded in, winter brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
winter sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Summerlin South weather by month
How the three winter months (December, January and February) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 55° / 38° | 0.8 | 3.6 | 9.8 | 4.4 |
| Feb | 59° / 40° | 1.1 | 4.3 | 10.6 | 5.5 |
| Mar | 67° / 46° | 0.6 | 3.2 | 11.7 | 7.4 |
| Apr | 74° / 52° | 0.3 | 2 | 12.9 | 8.5 |
| May | 84° / 60° | 0.2 | 1.2 | 13.9 | 7.2 |
| Jun | 94° / 69° | 0.1 | 0.4 | 14.4 | 3.6 |
| Jul | 99° / 75° | 0.3 | 2.7 | 14.2 | 1.6 |
| Aug | 98° / 74° | 0.5 | 2.7 | 13.4 | 2.2 |
| Sep | 90° / 67° | 0.3 | 1.4 | 12.2 | 5.1 |
| Oct | 77° / 55° | 0.3 | 1.7 | 11.1 | 8.5 |
| Nov | 64° / 44° | 0.4 | 1.5 | 10.1 | 7.1 |
| Dec | 54° / 37° | 0.8 | 2.9 | 9.6 | 4.0 |
Cloud cover in Winter
The sky is clear or mostly clear about 54% of the time across winter.
Chance of precipitation in Winter
Summerlin South gets around 2.7 in of rain and snow over 11 wet days across winter. The line is the day-by-day chance of measurable precipitation.
Humidity in Winter
Most of winter feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Winter
Winds average 4 mph across winter.
Sunrise & sunset in Winter
Daylight runs from about 9 h 42 min in early December to 11 h 06 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Winter
Average shortwave solar energy reaching the ground each day across winter, about 3.5 kWh/m².
Is winter a good time to visit Summerlin South?
Our two travel scores rate winter for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
winter is a reasonable time to visit Summerlin South for sightseeing.
What to pack for Summerlin South in Winter
From winter's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In winter, Summerlin South sees daytime highs around 56°F and nights near 38°F. Worth packing: a warm layer. About 11 days see rain.
UV index in Summerlin South in Winter
Clear-sky midday UV across winter averages around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Summerlin South peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 5 | 7 | 8 | 11 | 11 | 10 | 8 | 6 | 3 | 3 |
| Level | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 3 | Moderate |
Where is Summerlin South?
Summerlin South sits at 36.1°N, 115.3°W, 3,570 ft above sea level, in United States. The nearest listed city is Spring Valley, 5.0 mi away.
Topography around Summerlin South
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Summerlin South.
Within 2 miles, the terrain around Summerlin South has significant variations in elevation — a maximum elevation change of 1,165 ft around an average of 2,917 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 6,043 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 11,188 ft.
The land around Summerlin South is covered by artificial surfaces (55%) and bare terrain (33%) within 2 miles, bare terrain (41%) and artificial surfaces (38%) within 10 miles, and bare terrain (67%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Summerlin South (36.1171°, -115.33°, elevation 3,570 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.