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Summerlin South, Nevada climate

BWh Hot desert

Summerlin South has a strongly seasonal warm-temperate climate (Hot desert, Köppen BWh). The hottest month is July with an average daily high near 41°C, while the coldest is December averaging around 3°C at night. Precipitation totals about 121 mm a year and is strongly seasonal — February alone averages 22 mm while May barely receives 2 mm.

☀️ Summers

Extreme heat

Highs near 41°C in July.

About 133 days a year above 32 °C

❄️ Winters

Chilly

Lows near 3°C in December.

About 18 freezing nights a year

🌧️ Rain

Very dry

About 121 mm of rain a year.

Wettest in February

⛅ Sky & trend

Fairly sunny

More sun than cloud through the year.

+1.2 °C vs 50 years ago

Temperature & precipitation

Daily high–low temperature range with the monthly average, plus monthly precipitation · 1991–2020 normals · hover a month for the exact figures

Clear vs cloudy days

Share of days each month that are clear, partly cloudy or cloudy · 1991–2020 · hover a month for the day counts

Summerlin South climate normals (1991–2020)

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	15	18	22	26	32	38	41	40	36	28	20	14
Avg temp (°C)	9	11	16	19	25	31	34	33	28	21	13	8
Avg low (°C)	3	5	9	12	17	23	26	26	21	14	7	3
Precipitation (mm)	16	22	12	6	2	2	11	10	10	10	8	12
Snowfall (cm)	—	—	—	—	—	—	—	—	—	—	—	1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Avg high (°C)	15	18	22	26	32	38
Avg temp (°C)	9	11	16	19	25	31
Avg low (°C)	3	5	9	12	17	23
Precipitation (mm)	16	22	12	6	2	2
Snowfall (cm)	—	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Avg high (°C)	41	40	36	28	20	14
Avg temp (°C)	34	33	28	21	13	8
Avg low (°C)	26	26	21	14	7	3
Precipitation (mm)	11	10	10	10	8	12
Snowfall (cm)	—	—	—	—	—	1

How often — frequency of weather events

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	3	4	3	2	0.9	0.5	3	3	2	2	2	3
Days with high ≥ 32°C (days)	—	—	0.4	4	16	26	29	29	24	5	—	—
Days with low ≤ 0°C (days)	6	3	0.2	—	—	—	—	—	—	0.0	1	8
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	—	—	—	—	—	—	—	0.1

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Days with measurable rain (days)	3	4	3	2	0.9	0.5
Days with high ≥ 32°C (days)	—	—	0.4	4	16	26
Days with low ≤ 0°C (days)	6	3	0.2	—	—	—
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	—	—

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Days with measurable rain (days)	3	3	2	2	2	3
Days with high ≥ 32°C (days)	29	29	24	5	—	—
Days with low ≤ 0°C (days)	—	—	—	0.0	1	8
Days with snowfall ≥ 2.5 cm (days)	—	—	—	—	—	0.1

Sky & atmosphere

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	48	49	46	41	38	27	36	33	25	31	38	47
Clear days (≤ 30% cloud)	11	10	12	13	15	20	16	18	21	19	15	12
Partly cloudy days (30–70%)	11	10	12	10	11	7	10	10	7	7	10	11
Cloudy days (≥ 70%)	9	8	8	6	5	3	5	4	2	5	6	8
Relative humidity (%)	48	45	39	30	24	16	21	24	24	28	36	45
Wind speed (m/s)	2.4	2.5	2.7	3.0	3.0	3.1	2.6	2.5	2.4	2.4	2.3	2.4

Jan – Jun	Jan	Feb	Mar	Apr	May	Jun
Cloud cover (%)	48	49	46	41	38	27
Clear days (≤ 30% cloud)	11	10	12	13	15	20
Partly cloudy days (30–70%)	11	10	12	10	11	7
Cloudy days (≥ 70%)	9	8	8	6	5	3
Relative humidity (%)	48	45	39	30	24	16
Wind speed (m/s)	2.4	2.5	2.7	3.0	3.0	3.1

Jul – Dec	Jul	Aug	Sep	Oct	Nov	Dec
Cloud cover (%)	36	33	25	31	38	47
Clear days (≤ 30% cloud)	16	18	21	19	15	12
Partly cloudy days (30–70%)	10	10	7	7	10	11
Cloudy days (≥ 70%)	5	4	2	5	6	8
Relative humidity (%)	21	24	24	28	36	45
Wind speed (m/s)	2.6	2.5	2.4	2.4	2.3	2.4

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Las Vegas Wfo (NOAA GHCN station USC00264439), about 15 km from the city centre.

Cloud, humidity, wind & sunshine — modelled estimates from NASA POWER, NASA's satellite-and-reanalysis climatology. This is the standard global source for atmospheric variables, which are not measured at most weather stations.

How we build these numbers →