Photo: Americasroof · CC BY-SA 3.0Boulder City reaches 100° on about 100 days a year, more than all but 68 U.S. towns
January nights here settle around 41°. The wettest month is February; the driest is June. Precipitation is light here, less than falls on almost every U.S. town. Garden planting can start around January 21; autumn frost returns near December 17.
A year in Boulder City at a glance
Each month’s typical high and low, and what it brings.
What stands out about Boulder City’s climate
Compared with towns across the U.S., with Boulder City’s place in Nevada beside it.
What a year in Boulder City feels like
Typical highs and lows by season and by month, from NOAA’s 30-year normals.
About 328 frost-free days a year
In half of years the last 32° night comes by January 21 and the first by December 17. Frost and day counts come from NOAA’s station at Alan Bible Visitor Ctr, NV, 13 miles from the town’s center, 460 ft lower.
The 2023 USDA map puts Boulder City’s center in zone 9b: the coldest night of a typical winter, averaged over 1991–2020, reaches about 27°. 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 4 inches of rain a year
February is the wettest month and June the driest. Rain falls on about 27 days a year. Snow is rare: about 0.0" in a normal year at Boulder City, NV, so most winters see none.
Rain + melted snow by month
Inches of water
Heating and cooling a home in Boulder City
28% 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 Alan Bible Visitor Ctr, NV.
Living with Boulder City’s climate
What the numbers mean for a garden, a free afternoon and a bad-weather day.
328 frost-free days in zone 9b. The last frost comes by Jan 21 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 17.
Months with highs of 62–84° and lows of 40° or more: February, March, April, October and November. 364 miles of trails are waiting.
Parks & trails →Of the yearly building losses FEMA expects in Boulder City from natural hazards, river flooding is the largest share (41%); heat waves, cold waves, winter storms and ice storms together are 37%. Normals are averages; the hazards page covers the extremes.
Natural hazards →Boulder City and its neighbors
Henderson has the coldest January nights next door (40°, 1° colder). Differences under a degree are within what the 5 km grid can tell apart. Tap a town to see its climate.
Climates most like Boulder City’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 |
|---|---|---|---|---|
| Boulder City, NV | 41° | 106° | 4" | 0.0" |
| Garnet, CA | 43° | 105° | 5" | 0.0" |
| Goodyear, AZ | 41° | 106° | 7" | 0.0" |
| Laredo, TX | 45° | 99° | 20" | 0.1" |
| 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 Boulder City averaged 1.8° warmer than the 1900s. The biggest change is in January (+2.7°).
A bigger shift than in 76% 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 Boulder City compares
Against 12,954 U.S. towns of 2,500 or more (one per 5 km climate cell), with Boulder City’s place among Nevada’s.
Boulder City weather by month
Highs, lows and precipitation from NOAA’s grid at Boulder City’s center; snow, wet days and snow on the ground from Boulder City, NV. 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 60° | 41° | 0.6" | 0.0" | 4 | 0 | 46° – 56° |
| February | 64° | 44° | 0.8" | 0.0" | 4 | 0 | 47° – 61° |
| March | 73° | 50° | 0.4" | 0.0" | 4 | 0 | 54° – 67° |
| April | 80° | 56° | 0.2" | 0.0" | 2 | 0 | 62° – 73° |
| May | 90° | 65° | 0.1" | 0.0" | 1 | 0 | 70° – 83° |
| June | 101° | 74° | 0.1" | 0.0" | 1 | 0 | 82° – 92° |
| July | 106° | 80° | 0.4" | 0.0" | 2 | 0 | 89° – 96° |
| August | 104° | 79° | 0.4" | 0.0" | 3 | 0 | 88° – 95° |
| September | 97° | 71° | 0.3" | 0.0" | 2 | 0 | 81° – 87° |
| October | 83° | 59° | 0.4" | 0.0" | 2 | 0 | 67° – 77° |
| November | 69° | 48° | 0.3" | 0.0" | 2 | 0 | 51° – 64° |
| December | 59° | 40° | 0.5" | 0.0" | 2 | 0 | 45° – 54° |
| Year | 82° | 59° | 4.3" | 0.0" | 27 | 0 |
How much a month can swing
A normal is an average. February swings the most: from 1991 to 2020 its average ranged from 47° to 61°. September is the most reliable, staying within 6°.
Where Boulder City’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 Boulder City’s center.
- Snow: Boulder City, NV.
- Frost, freezing nights, 90° and 100° days, heating and cooling: Alan Bible Visitor Ctr, NV, 13 miles from the town’s center, 460 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 Boulder City’s climate
What is the weather like in Boulder City?
A typical July afternoon reaches 106°, a January night drops to 41°, and snow is almost unheard of. Milder January nights than 90% of U.S. towns; hotter July afternoons than all but 49 U.S. towns.
How cold does it get in Boulder City in winter?
December nights average 40°. About 5 nights a year reach 32° or below. In the coldest December of the last 30 years the month averaged 45°.
How much snow does Boulder City get?
About 0.0 inches in a normal winter at Boulder City, NV, so most winters see none.
How hot does it get in Boulder City?
July, with a typical high of 106° and a low of 80°. About 147 days a year reach 90° and 100 reach 100° (Alan Bible Visitor Ctr, NV).
When is the first and last frost in Boulder City?
In half of years the last spring frost (32°) comes by January 21 and the first fall frost by December 17, about 328 frost-free days, at Alan Bible Visitor Ctr, NV.
What growing zone is Boulder City in?
Zone 9b on the 2023 USDA Plant Hardiness Zone Map: the coldest night of a typical winter reaches about 27°.
What is the best time of year to visit Boulder City?
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 Boulder City getting warmer?
Yes: 1991–2020 averaged 1.8° warmer than 1901–2000 on NOAA’s grid. A bigger shift than 76% of U.S. towns.
Neighbors talk weather
Gardens, snow, and the best days of the year in Boulder City.
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.