This report describes the typical weather at the Nellis Air Force Base (Las Vegas, Nevada, United States) weather station over the course of an average April. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Las Vegas, Nevada has a hot desert climate. The area within 25 mi of this station is covered by shrublands (92%), built-up areas (4%), and lakes and rivers (4%).
The month of April is characterized by rapidly rising daily high temperatures, with daily highs increasing from 74Â°F to 83Â°F over the course of the month, exceeding 93Â°F or dropping below 63Â°F only one day in ten.
Over the course of April, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:03 hours, implying an average day-over-day increase of 2.1 minutes.
The shortest day of the month is April 1 with 12:37 hours of daylight; the longest day is April 30 with 13:40 hours of daylight.
The earliest sunrise is at 5:48am on April 30; the latest sunset is at 7:28pm on April 30; the latest sunrise is at 6:26am on April 1; the earliest sunset is at 7:03pm on April 1.
Daylight saving time is observed in 2012 but it neither starts nor ends in April, so the entire month is in daylight time.
The median cloud cover ranges from 37% (mostly clear) to 42% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 5% from the start to the end of the month.
On April 15, a representative day, the sky is clear or mostly clear 48% of the time, partly cloudy 21% of the time, and mostly cloudy or overcast 31% of the time.
The average probability that some form of precipitation will be observed in a given day is 15%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are light rain and thunderstorms.
Light rain is the most severe precipitation observed during 65% of those days with precipitation. It is most likely around April 1, when it is observed during 11% of all days.
Thunderstorms are the most severe precipitation observed during 19% of those days with precipitation. They are most likely around April 30, when it is observed during 3% of all days.
Either snow is exceptionally unlikely to fall at this location in April or this station does not reliably report precipitation types.
The relative humidity typically ranges from 13% (very dry) to 49% (comfortable) over the course of a typical April, rarely dropping below 7% (very dry), or exceeding 80% (humid).
The air is driest around April 30, at which time the relative humidity drops below 15% (dry) three days out of four; it is most humid around April 1, rising above 33% (comfortable) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical April, the dew point typically varies from 19Â°F (dry) to 35Â°F (dry) and is rarely below 8Â°F (dry) or above 45Â°F (dry).
Over the course of April typical wind speeds vary from 0 mph to 18 mph (calm to fresh breeze), rarely exceeding 29 mph (strong breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around April 30, at which time the average daily maximum wind speed is 18 mph (fresh breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around April 1, at which time the average daily maximum wind speed is 17 mph (moderate breeze).