Climate and average weather in Boulder City
In Boulder City, the summers are sweltering, dry, and clear and the winters are cool and mostly clear.
Over the course of the year, the temperature in Boulder City typically varies from 41°F to 104°F, and is rarely below 33°F or above 110°F. July is the hottest month of the year, while December is the coldest.
Based on the travel score, the best times of year to visit Boulder City for warm-weather activities are from early March to early May and mid October to late November.
- Hottest
- Jul
- 104°
- Coldest
- Dec
- 41°
- Wettest
- Feb
- 1.2 in
- Driest
- Jun
- 0.1 in
- Rain / yr
- 6.0 in
- 28 wet days
- Daylight
- 9.6–14.4 h
- shortest–longest
- Elevation
- 2,510 ft
- 36.0°N
- Clearest
- Jun
- 17% cloud
Boulder City is city in Clark County, Nevada, United States.
- Density
- 29/km²
- people per km²
- Founded
- 1931
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Boulder City weather by month, at a glance
The whole year in one picture — sky, rain, humidity, temperature and travel score. Click any band to jump to its full chart.
Each stripe is one measure across the whole year, stacked so a single day reads top to bottom. The sky band runs overcast grey on top down to clear blue at the base — more blue means sunnier — followed by the rainfall curve, the humidity band, a temperature strip that tints each stretch of the year by how warm its average high is, and the travel-score line at the foot. Scan straight down any date to read that day across every measure at once; the score climbs highest around early March to early May.
Temperature through the year
Daily average highs and lows in Boulder City, from 1991–2020 of climate data. The shaded bands show the range most days fall in — 10th to 90th percentile.
The hot season lasts 4.0 months, from May 27 to September 24, with daily high temperatures above 92°F. The hottest month of the year in Boulder City is July, with an average high of 104°F and low of 82°F.
The cool season lasts 3.3 months, from November 20 to February 26, with daily high temperatures below 65°F. The coldest month of the year in Boulder City is December, with an average low of 41°F and high of 56°F.
Days typically run about 20°F warmer than nights, with the widest day–night swing (around 24°F) in June.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°F) | 58 | 63 | 71 | 79 | 89 | 99 | 104 | 102 | 95 | 81 | 67 | 56 |
| Avg low (°F) | 41 | 45 | 51 | 57 | 66 | 75 | 82 | 81 | 73 | 61 | 49 | 41 |
| Avg high (°F) | Avg low (°F) | |
|---|---|---|
| Jan | 58 | 41 |
| Feb | 63 | 45 |
| Mar | 71 | 51 |
| Apr | 79 | 57 |
| May | 89 | 66 |
| Jun | 99 | 75 |
| Jul | 104 | 82 |
| Aug | 102 | 81 |
| Sep | 95 | 73 |
| Oct | 81 | 61 |
| Nov | 67 | 49 |
| Dec | 56 | 41 |
How hot and cold Boulder City really feels
The felt-temperature range through the year — heat index on the day's high (summer humidity), wind chill on the night's low (winter wind). The dashed lines are the plain thermometer; the gap is how much hotter or colder it really feels.
On the hottest afternoons, once humidity is folded in, Boulder City feels like about 104°F (around July 13). About 132 days a year carry some heat stress, and 57 of them tip into dangerous heat (feels-like above 102°F), peaking in July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels-like high (°F) | 58 | 63 | 71 | 79 | 89 | 99 | 104 | 102 | 95 | 81 | 67 | 56 |
| Air high (°F) | 58 | 63 | 71 | 79 | 89 | 99 | 104 | 102 | 95 | 81 | 67 | 56 |
| Feels-like low (°F) | 39 | 42 | 50 | 57 | 66 | 75 | 82 | 81 | 73 | 61 | 48 | 38 |
| Air low (°F) | 41 | 45 | 51 | 57 | 66 | 75 | 82 | 81 | 73 | 61 | 49 | 41 |
| Feels-like high (°F) | Air high (°F) | Feels-like low (°F) | Air low (°F) | |
|---|---|---|---|---|
| Jan | 58 | 58 | 39 | 41 |
| Feb | 63 | 63 | 42 | 45 |
| Mar | 71 | 71 | 50 | 51 |
| Apr | 79 | 79 | 57 | 57 |
| May | 89 | 89 | 66 | 66 |
| Jun | 99 | 99 | 75 | 75 |
| Jul | 104 | 104 | 82 | 82 |
| Aug | 102 | 102 | 81 | 81 |
| Sep | 95 | 95 | 73 | 73 |
| Oct | 81 | 81 | 61 | 61 |
| Nov | 67 | 67 | 48 | 49 |
| Dec | 56 | 56 | 38 | 41 |
Average hourly temperature in Boulder City
A compact picture of the whole year, hour by hour: each column is a day, each row an hour, and the color is the modeled average temperature. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
Read left to right for the day of the year and top to bottom for the hour of the day; the color is the modeled temperature, cool blues through to hot reds on the same scale as the other charts. A vertical slice is a single day's swing — coolest just before dawn, warmest in the mid-afternoon — while a horizontal slice follows one hour across the seasons. The darker overlay marks night and the lighter one the twilight around sunrise and sunset. Colors run warmest on July afternoons, near 104°F, and coldest before dawn in December, near 41°F.
Boulder City weather by month
Every month at a glance. Click a month for its detailed page.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 58° / 41° | 0.9 | 3.6 | 9.8 | 5.1 |
| Feb | 63° / 45° | 1.2 | 4.4 | 10.6 | 6.5 |
| Mar | 71° / 51° | 0.7 | 3.2 | 11.7 | 8.0 |
| Apr | 79° / 57° | 0.3 | 1.6 | 12.9 | 8.3 |
| May | 89° / 66° | 0.1 | 1.1 | 13.9 | 5.5 |
| Jun | 99° / 75° | 0.1 | 0.5 | 14.4 | 1.8 |
| Jul | 104° / 82° | 0.3 | 2.5 | 14.2 | 0.0 |
| Aug | 102° / 81° | 0.4 | 3 | 13.4 | 0.6 |
| Sep | 95° / 73° | 0.3 | 1.8 | 12.2 | 3.4 |
| Oct | 81° / 61° | 0.4 | 1.8 | 11.1 | 7.8 |
| Nov | 67° / 49° | 0.5 | 1.7 | 10.1 | 7.8 |
| Dec | 56° / 41° | 0.8 | 3 | 9.6 | 4.8 |
Chance of rain
How likely it is to rain on a typical day, and how that shifts across the wetter and drier seasons.
Boulder City gets about 6.0 in of precipitation a year. On a typical day the chance of rain is mostly dry, but that rises and falls sharply with the seasons.
The wetter season lasts 3.9 months, from around Dec 3 to Apr 1, peaking in February at about 18% chance on a given day. The drier stretch runs the rest of the year, bottoming out around Jun 17.
February is the wettest month by volume, with 1.2 in over about 4 wet days; June is the driest, with 0.1 in.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain on a day (%) | 11 | 15 | 11 | 5 | 3 | 2 | 8 | 9 | 6 | 5 | 6 | 10 |
| Rain days | 4 | 4 | 3 | 2 | 1 | 1 | 3 | 3 | 2 | 2 | 2 | 3 |
| Rain on a day (%) | Rain days | |
|---|---|---|
| Jan | 11 | 4 |
| Feb | 15 | 4 |
| Mar | 11 | 3 |
| Apr | 5 | 2 |
| May | 3 | 1 |
| Jun | 2 | 1 |
| Jul | 8 | 3 |
| Aug | 9 | 3 |
| Sep | 6 | 2 |
| Oct | 5 | 2 |
| Nov | 6 | 2 |
| Dec | 10 | 3 |
Monthly rainfall
Over a full year, Boulder City collects about 6.0 in of rain across 28 wet days — roughly 0.5 in in an average month.
It doesn’t fall evenly. February is the wettest month with 1.2 in, while June is the driest at just 0.1 in. The three wettest months alone bring about 48% of the year’s total.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (in) | 0.9 | 1.2 | 0.7 | 0.3 | 0.1 | 0.1 | 0.3 | 0.4 | 0.3 | 0.4 | 0.5 | 0.8 |
| Rain days | 4 | 4 | 3 | 2 | 1 | 1 | 3 | 3 | 2 | 2 | 2 | 3 |
| Rainfall (in) | Rain days | |
|---|---|---|
| Jan | 0.9 | 4 |
| Feb | 1.2 | 4 |
| Mar | 0.7 | 3 |
| Apr | 0.3 | 2 |
| May | 0.1 | 1 |
| Jun | 0.1 | 1 |
| Jul | 0.3 | 3 |
| Aug | 0.4 | 3 |
| Sep | 0.3 | 2 |
| Oct | 0.4 | 2 |
| Nov | 0.5 | 2 |
| Dec | 0.8 | 3 |
Clouds and sunshine
How often the daytime sky is clear, partly cloudy or overcast.
In Boulder City, the average share of the sky covered by clouds shows moderate seasonal variation over the course of the year.
The clearer part of the year begins around April 19 and lasts for 7.1 months, ending around November 21. The clearest month is September, when the sky is clear, mostly clear, or partly cloudy 91% of the time on average.
The cloudier part of the year begins around November 22 and lasts for 4.9 months, ending around April 18. The cloudiest month is February, when it is overcast or mostly cloudy 34% of the time.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 67 | 66 | 70 | 78 | 83 | 91 | 86 | 88 | 91 | 85 | 80 | 69 |
| Cloudier (%) | 33 | 34 | 30 | 22 | 17 | 9 | 14 | 12 | 9 | 15 | 20 | 31 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| Jan | 67 | 33 |
| Feb | 66 | 34 |
| Mar | 70 | 30 |
| Apr | 78 | 22 |
| May | 83 | 17 |
| Jun | 91 | 9 |
| Jul | 86 | 14 |
| Aug | 88 | 12 |
| Sep | 91 | 9 |
| Oct | 85 | 15 |
| Nov | 80 | 20 |
| Dec | 69 | 31 |
Daylight, sunrise and sunset
Hours of daylight through the year, with sunrise and sunset times.
The gold band is daylight — sunrise runs along its lower edge, sunset along the upper — so it widens toward summer and pinches toward winter, with night the dark area above and below. The longest day, around June 8, brings about 14 h 24 min of light; the shortest, around January 1, only 9 h 36 min — a swing of roughly 4 h 48 min.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 9.8 | 10.6 | 11.7 | 12.9 | 13.9 | 14.4 | 14.2 | 13.4 | 12.2 | 11.1 | 10.1 | 9.6 |
| Sunrise (AM) | 6:54 | 6:35 | 5:57 | 5:12 | 4:39 | 4:27 | 4:38 | 5:02 | 5:27 | 5:52 | 6:23 | 6:48 |
| Sunset (PM) | 4:43 | 5:13 | 5:41 | 6:07 | 6:33 | 6:52 | 6:52 | 6:25 | 5:40 | 4:56 | 4:26 | 4:23 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| Jan | 9.8 | 6:54 | 4:43 |
| Feb | 10.6 | 6:35 | 5:13 |
| Mar | 11.7 | 5:57 | 5:41 |
| Apr | 12.9 | 5:12 | 6:07 |
| May | 13.9 | 4:39 | 6:33 |
| Jun | 14.4 | 4:27 | 6:52 |
| Jul | 14.2 | 4:38 | 6:52 |
| Aug | 13.4 | 5:02 | 6:25 |
| Sep | 12.2 | 5:27 | 5:40 |
| Oct | 11.1 | 5:52 | 4:56 |
| Nov | 10.1 | 6:23 | 4:26 |
| Dec | 9.6 | 6:48 | 4:23 |
Sunny days
How many genuinely sunny days each month brings — days the sky stays clear or mostly clear — banded into plain-language zones.
Boulder City averages about 20 sunny days a month — counting the days the sky stays clear or mostly clear — with a clear seasonal swing between 15 and 26 days.
The sunnier stretch runs 6.1 months, from around May 17 to Nov 19. The sunniest month is September, with roughly 25 sunny days (brilliant).
The greyest month is February, down near 15 sunny days — about 40% fewer than the September peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sunny days | 16 | 14 | 17 | 19 | 21 | 25 | 23 | 24 | 25 | 23 | 20 | 18 |
| Sky | Bright | Bright | Bright | Bright | Bright | Brilliant | Bright | Brilliant | Brilliant | Bright | Bright | Bright |
| Sunny days | Sky | |
|---|---|---|
| Jan | 16 | Bright |
| Feb | 14 | Bright |
| Mar | 17 | Bright |
| Apr | 19 | Bright |
| May | 21 | Bright |
| Jun | 25 | Brilliant |
| Jul | 23 | Bright |
| Aug | 24 | Brilliant |
| Sep | 25 | Brilliant |
| Oct | 23 | Bright |
| Nov | 20 | Bright |
| Dec | 18 | Bright |
Humidity comfort
Share of days at each humidity comfort level, based on the dew point — the measure that tracks how muggy it actually feels.
Humidity comfort is graded by the dew point — the temperature at which the air would be fully saturated — because it tracks how muggy it actually feels far better than relative humidity does. A low dew point feels dry and crisp; a high one feels sticky and oppressive no matter the reading on a humidity gauge.
In Boulder City, the air stays dry or comfortable essentially all year. Even in July, the muggiest month, it feels humid or worse only about 9% of the time — humidity is not something you need to plan around here.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 100 | 100 | 100 | 100 | 100 | 99 | 79 | 72 | 85 | 98 | 100 | 100 |
| Comfortable (%) | 0 | 0 | 0 | 0 | 0 | 1 | 11 | 17 | 9 | 2 | 0 | 0 |
| Humid (%) | 0 | 0 | 0 | 0 | 0 | 0 | 7 | 9 | 6 | 0 | 0 | 0 |
| Muggy (%) | 0 | 0 | 0 | 0 | 0 | 0 | 2 | 3 | 1 | 0 | 0 | 0 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | |
|---|---|---|---|---|
| Jan | 100 | 0 | 0 | 0 |
| Feb | 100 | 0 | 0 | 0 |
| Mar | 100 | 0 | 0 | 0 |
| Apr | 100 | 0 | 0 | 0 |
| May | 100 | 0 | 0 | 0 |
| Jun | 99 | 1 | 0 | 0 |
| Jul | 79 | 11 | 7 | 2 |
| Aug | 72 | 17 | 9 | 3 |
| Sep | 85 | 9 | 6 | 1 |
| Oct | 98 | 2 | 0 | 0 |
| Nov | 100 | 0 | 0 | 0 |
| Dec | 100 | 0 | 0 | 0 |
Wind
Average wind speed through the year, banded into plain-language speed zones so a number reads as 'breezy' or 'calm' without knowing the scale.
This is the average sustained wind speed at the standard 10 metres above open ground — the steady flow a weather station reports, not the sharper gusts that come and go, which can run half again as fast. It's the number that says whether a place is generally breezy or calm.
Across the year, average wind speed in Boulder City is typically calm, near 5 mph, and varies little with the seasons.
The windier part of the year lasts 5.6 months, from around Mar 12 to Aug 28. The windiest month is June, averaging about 6 mph (calm).
The calmer part of the year runs from around Aug 29 to Mar 11, with January the calmest month at about 4 mph.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (mph) | 4 | 4 | 5 | 6 | 6 | 6 | 6 | 5 | 5 | 4 | 4 | 4 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (mph) | Feels | |
|---|---|---|
| Jan | 4 | calm |
| Feb | 4 | calm |
| Mar | 5 | calm |
| Apr | 6 | calm |
| May | 6 | calm |
| Jun | 6 | calm |
| Jul | 6 | calm |
| Aug | 5 | calm |
| Sep | 5 | calm |
| Oct | 4 | calm |
| Nov | 4 | calm |
| Dec | 4 | calm |
Best time to visit Boulder City
To characterize how pleasant the weather is in Boulder City throughout the year, we compute two travel scores — one for general sightseeing, one for beach and pool weather.
Around late April, Boulder City is still near the tail of its best-weather window — great conditions with the peak-season crowds already thinning.
Inferred from the travel-score curve; month-by-month visitor numbers are a planned addition.
The travel score favors clear, rainless days with daytime highs between 64°F and 82°F. Based on this score, the best times of year to visit Boulder City for general outdoor tourist activities run from early March to early May and again from mid October to late November, with a peak score in the last week of October.
The travel score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Travel score (0–10) | 5.2 | 6.5 | 8.0 | 8.3 | 5.5 | 1.9 | 0.1 | 0.6 | 3.4 | 7.7 | 7.7 | 4.8 |
| Rating | fair | good | ideal | ideal | fair | poor | poor | poor | poor | ideal | ideal | fair |
| Travel score (0–10) | Rating | |
|---|---|---|
| Jan | 5.2 | fair |
| Feb | 6.5 | good |
| Mar | 8.0 | ideal |
| Apr | 8.3 | ideal |
| May | 5.5 | fair |
| Jun | 1.9 | poor |
| Jul | 0.1 | poor |
| Aug | 0.6 | poor |
| Sep | 3.4 | poor |
| Oct | 7.7 | ideal |
| Nov | 7.7 | ideal |
| Dec | 4.8 | fair |
The beach/pool score favors clear, rainless days with daytime highs between 75°F and 93°F. Based on this score, the best times of year to visit Boulder City for hot-weather activities run from early April to early June and again from mid September to late October, with a peak score in the second week of October.
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
What to pack for Boulder City, by month
Month by month, what's worth putting in the bag — from the temperature range, rain chance, sun and wind. Tap a month for a quick packing note.
For a warm-season trip around July (highs near 104°F), the essentials are light clothes and sun protection. In the cold season around December (highs near 56°F), pack a warm layer.
In July, Boulder City sees daytime highs around 104°F and nights near 82°F. Pack light clothes and sun protection.
UV index (midday) in Boulder City by month
Clear-sky midday UV index through the year, shaded by the WHO exposure levels — how much sun protection each month calls for.
Under clear skies, the midday UV index in Boulder City peaks around June 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 19 at about 2 (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 | 6 | 8 | 11 | 10 | 10 | 8 | 6 | 3 | 2 |
| Level | Moderate | Moderate | Moderate | High | Very high | Extreme | Extreme | Very high | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 5 | Moderate |
| Apr | 6 | High |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Very high |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 2 | Moderate |
Average hourly UV index in Boulder City
Modeled clear-sky UV for every hour of every day — when in the day sun protection actually matters.
The whole year hour by hour: each column is a day, each row an hour, and the color is the modeled clear-sky UV index — the midday peak scaled down as the sun sits lower in the sky. Darker overlays mark night, lighter ones the civil-twilight hours around sunrise and sunset.
UV falls off far faster than brightness as the sun drops, so even in June the burn window is concentrated in the middle of the day: about 8.5 hours a day reach index 3 (protection recommended), and 6 hours reach 6 or more. Mornings and late afternoons stay comparatively gentle year round.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV ≥ 3 (h/day) | 0 | 3 | 5 | 6.5 | 7.5 | 8.5 | 8.5 | 8 | 7 | 5 | 2 | 0 |
| UV ≥ 6 (h/day) | 0 | 0 | 0 | 2 | 4.5 | 6 | 6 | 5.5 | 3.5 | 0 | 0 | 0 |
| UV ≥ 3 (h/day) | UV ≥ 6 (h/day) | |
|---|---|---|
| Jan | 0 | 0 |
| Feb | 3 | 0 |
| Mar | 5 | 0 |
| Apr | 6.5 | 2 |
| May | 7.5 | 4.5 |
| Jun | 8.5 | 6 |
| Jul | 8.5 | 6 |
| Aug | 8 | 5.5 |
| Sep | 7 | 3.5 |
| Oct | 5 | 0 |
| Nov | 2 | 0 |
| Dec | 0 | 0 |
Growing season
Boulder City is mild enough that a frost-free day stays more likely than not even in midwinter.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Frost-free chance (%) | 96 | 99 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 100 | 96 |
| Frost nights | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Frost-free chance (%) | Frost nights | |
|---|---|---|
| Jan | 96 | 0 |
| Feb | 99 | 0 |
| Mar | 100 | 0 |
| Apr | 100 | 0 |
| May | 100 | 0 |
| Jun | 100 | 0 |
| Jul | 100 | 0 |
| Aug | 100 | 0 |
| Sep | 100 | 0 |
| Oct | 100 | 0 |
| Nov | 100 | 0 |
| Dec | 96 | 0 |
Growing degree days
Growing degree days tally heat above 50°F: each day adds however many degrees its average temperature runs over that threshold, and cold days add nothing. Boulder City banks about 7,490 degree days a year, and the running total — which growers use to time plantings and predict maturity — climbs fastest around July.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Growing degree days (°F·days) | 8 | 106 | 338 | 542 | 850 | 1,114 | 1,332 | 1,294 | 1,019 | 654 | 229 | 5 |
| Growing degree days (°F·days) | |
|---|---|
| Jan | 8 |
| Feb | 106 |
| Mar | 338 |
| Apr | 542 |
| May | 850 |
| Jun | 1,114 |
| Jul | 1,332 |
| Aug | 1,294 |
| Sep | 1,019 |
| Oct | 654 |
| Nov | 229 |
| Dec | 5 |
Solar energy
Average daily shortwave solar energy reaching the ground, banded into brightness zones so the number means something at a glance.
Solar energy is how much sunlight actually reaches the ground each day, measured in kilowatt-hours per square metre (kWh/m²) — the combined effect of how long the sun is up, how high it climbs, and how much cloud gets in the way. It's the raw fuel a solar panel has to work with: for scale, 1 kWh/m² a day is dim and wintry, while 7+ is desert-bright.
Boulder City receives about 5.8 kWh/m² a day of solar energy on average — bright — with a clear seasonal swing between 2.8 and 8.5 kWh/m².
The brighter stretch of the year lasts 6.3 months, from around Mar 18 to Sep 26. The brightest month is June, averaging about 8.5 kWh/m² (intense).
The dimmest month is December, down near 2.9 kWh/m² — roughly 66% less than the June peak.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 3.1 | 4.2 | 5.7 | 7.2 | 8.1 | 8.5 | 7.9 | 7.2 | 6.2 | 4.8 | 3.5 | 2.9 |
| Level | Moderate | Bright | Bright | Intense | Intense | Intense | Intense | Intense | Intense | Bright | Moderate | Moderate |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| Jan | 3.1 | Moderate |
| Feb | 4.2 | Bright |
| Mar | 5.7 | Bright |
| Apr | 7.2 | Intense |
| May | 8.1 | Intense |
| Jun | 8.5 | Intense |
| Jul | 7.9 | Intense |
| Aug | 7.2 | Intense |
| Sep | 6.2 | Intense |
| Oct | 4.8 | Bright |
| Nov | 3.5 | Moderate |
| Dec | 2.9 | Moderate |
Where is Boulder City?
Boulder City sits at 36.0°N, 114.8°W, 2,510 ft above sea level, in United States. The nearest listed city is Henderson, 9.3 mi away.
Topography around Boulder City
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Boulder City.
Within 2 miles, the terrain around Boulder City has significant variations in elevation — a maximum elevation change of 1,634 ft around an average of 2,431 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,455 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,315 ft.
The land around Boulder City is covered by bare terrain (55%) and artificial surfaces (27%) within 2 miles, bare terrain (68%) within 10 miles, and bare terrain (59%) and shrubs (26%) 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 Boulder City (35.9786°, -114.8325°, elevation 2,510 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).