Average Weather in Boulder City Nevada, United States
In Boulder City, the summers are sweltering, the winters are cold, and it is dry and mostly clear year round. Over the course of the year, the temperature typically varies from 36°F to 104°F and is rarely below 28°F or above 110°F.
Based on the beach/pool score, the best time of year to visit Boulder City for hot-weather activities is from early June to mid September.
The hot season lasts for 3.5 months, from May 30 to September 15, with an average daily high temperature above 94°F. The hottest day of the year is July 11, with an average high of 104°F and low of 75°F.
The cool season lasts for 3.1 months, from November 18 to February 23, with an average daily high temperature below 65°F. The coldest day of the year is December 25, with an average low of 36°F and high of 55°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.
Average Hourly Temperature
In Boulder City, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.
The clearer part of the year in Boulder City begins around May 2 and lasts for 6.0 months, ending around November 1. On June 20, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 88% of the time, and overcast or mostly cloudy 12% of the time.
The cloudier part of the year begins around November 1 and lasts for 6.0 months, ending around May 2. On February 19, the cloudiest day of the year, the sky is overcast or mostly cloudy 39% of the time, and clear, mostly clear, or partly cloudy 61% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Boulder City varies throughout the year.
The wetter season lasts 8.4 months, from July 8 to March 21, with a greater than 7% chance of a given day being a wet day. The chance of a wet day peaks at 12% on February 22.
The drier season lasts 3.6 months, from March 21 to July 8. The smallest chance of a wet day is 1% on June 12.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 12% on February 22.
Daily Chance of Precipitation
To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Boulder City experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 7.4 months, from August 2 to March 16, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around February 21, with an average total accumulation of 0.8 inches.
The rainless period of the year lasts for 4.6 months, from March 16 to August 2. The least rain falls around June 4, with an average total accumulation of 0.1 inches.
Average Monthly Rainfall
The length of the day in Boulder City varies significantly over the course of the year. In 2020, the shortest day is December 21, with 9 hours, 43 minutes of daylight; the longest day is June 20, with 14 hours, 36 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:22 AM on June 12, and the latest sunrise is 1 hour, 39 minutes later at 7:01 AM on October 31. The earliest sunset is at 4:24 PM on December 4, and the latest sunset is 3 hours, 35 minutes later at 8:00 PM on June 28.
Daylight saving time (DST) is observed in Boulder City during 2020, starting in the spring on March 8, lasting 7.8 months, and ending in the fall on November 1.
Sunrise & Sunset with Twilight and Daylight Saving Time
The perceived humidity level in Boulder City, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 2% of 2% throughout.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Boulder City experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.1 months, from March 13 to July 15, with average wind speeds of more than 8.0 miles per hour. The windiest day of the year is April 25, with an average hourly wind speed of 9.1 miles per hour.
The calmer time of year lasts for 7.9 months, from July 15 to March 13. The calmest day of the year is October 11, with an average hourly wind speed of 6.9 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Boulder City varies throughout the year.
The wind is most often from the west for 4.1 weeks, from April 15 to May 14, with a peak percentage of 37% on May 8. The wind is most often from the south for 4.4 months, from May 14 to September 26, with a peak percentage of 63% on August 6. The wind is most often from the north for 6.6 months, from September 26 to April 15, with a peak percentage of 68% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is in Boulder City throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Boulder City for general outdoor tourist activities are from early May to late June and from late August to mid October, with a peak score in the third week of September.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Boulder City for hot-weather activities is from early June to mid September, with a peak score in the first week of July.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
The growing season in Boulder City typically lasts for 9.8 months (297 days), from around February 9 to around December 2, rarely starting before January 8 or after March 7, and rarely ending before November 13 or after December 24.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Boulder City should appear around February 6, only rarely appearing before January 26 or after February 20.
Growing Degree Days
The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.
The brighter period of the year lasts for 3.2 months, from April 24 to July 30, with an average daily incident shortwave energy per square meter above 7.5 kWh. The brightest day of the year is June 17, with an average of 8.7 kWh.
The darker period of the year lasts for 3.2 months, from November 3 to February 10, with an average daily incident shortwave energy per square meter below 4.1 kWh. The darkest day of the year is December 22, with an average of 2.9 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Boulder City are 35.979 deg latitude, -114.832 deg longitude, and 2,326 ft elevation.
The topography within 2 miles of Boulder City contains very significant variations in elevation, with a maximum elevation change of 1,503 feet and an average elevation above sea level of 2,429 feet. Within 10 miles contains very significant variations in elevation (3,435 feet). Within 50 miles also contains extreme variations in elevation (10,381 feet).
The area within 2 miles of Boulder City is covered by shrubs (87%), within 10 miles by shrubs (88%), and within 50 miles by shrubs (93%).
This report illustrates the typical weather in Boulder City, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.
Temperature and Dew Point
There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in Boulder City.
For each station, the records are corrected for the elevation difference between that station and Boulder City according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.
The estimated value at Boulder City is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Boulder City and a given station.
The stations contributing to this reconstruction are: Boulder City Municipal Airport (94%, 4.4 kilometers, southwest); Nellis Air Force Base (6%, 35 kilometers, northwest); and Colorado City Municipal Airport (0.4%, 196 kilometers, northeast).
Time zones for aiports and weather stations are provided by AskGeo.com .