This report describes the typical weather at the McCarran International Airport (Las Vegas, Nevada, United States) weather station over the course of an average March. It is based on the historical records from 1989 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 (93%), built-up areas (4%), and lakes and rivers (2%).
The month of March is characterized by rising daily high temperatures, with daily highs increasing from 65°F to 74°F over the course of the month, exceeding 84°F or dropping below 56°F only one day in ten.
Over the course of March, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:08 hours, implying an average day-over-day increase of 2.2 minutes.
The shortest day of the month is March 1 with 11:26 hours of daylight; the longest day is March 31 with 12:34 hours of daylight.
The earliest sunrise is at 5:58am on March 10; the latest sunset is at 7:02pm on March 31; the latest sunrise is at 6:56am on March 11; the earliest sunset is at 5:36pm on March 1.
Daylight saving time (DST) starts at 3:00am on March 11, 2012, shifting sunrise and sunset to an hour later.
The median cloud cover ranges from 35% (mostly clear) to 45% (partly cloudy). The trend is for the sky to be clearing with the median cloud cover decreasing by 9% from the start to the end of the month.
On March 31, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 67% of the time, and overcast or mostly cloudy 29% of the time.
On March 6, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 51% of the time, and clear or mostly clear 46% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around March 4, occurring in 18% of days. Precipitation is least likely around March 31, occurring in 12% of days.
Throughout March, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 64% of those days with precipitation. It is most likely around March 1, when it is observed during 11% of all days.
Moderate rain is the most severe precipitation observed during 27% of those days with precipitation. It is most likely around March 4, when it is observed during 5% of all days.
Either snow is exceptionally unlikely to fall at this location in March or this station does not reliably report precipitation types.
The relative humidity typically ranges from 17% (dry) to 58% (mildly humid) over the course of a typical March, rarely dropping below 9% (very dry), or exceeding 85% (very humid).
The air is driest around March 31, at which time the relative humidity drops below 19% (dry) three days out of four; it is most humid around March 1, rising above 42% (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 March, the dew point typically varies from 19°F (dry) to 34°F (dry) and is rarely below 7°F (dry) or above 45°F (dry).
Over the course of March typical wind speeds vary from 0 mph to 18 mph (calm to fresh breeze), rarely exceeding 27 mph (strong breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around March 31, at which time the average daily maximum wind speed is 18 mph (fresh breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around March 2, at which time the average daily maximum wind speed is 14 mph (moderate breeze).