This report describes the typical weather at the North Las Vegas Airport (Las Vegas, Nevada, United States) weather station over the course of an average September 29. It is based on the historical records from 1999 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 (94%) and built-up areas (4%).
The temperature typically varies from 67°F to 88°F and is rarely below 60°F or above 95°F.
The coolest hours of the day are from 2am to 9am with the coldest at 7am, at which time the temperature is below 70°F three days out of four.
The warmest hours of the day are from noon to 7pm with the hottest at 4pm, at which time the temperature is above 83°F three days out of four.
The day has gained half its heat by 10am and lost it again by 10pm.
On September 29 the Sun rises at 6:35am and sets at 6:26pm.
Solar noon is at 12:30pm.
For reference, on the longest day of the year the Sun rises at 5:23am and sets at 8:01pm, while on the shortest day of the year it rises at 6:48am and sets at 4:30pm.
Astronomical twilight begins and ends 85 minutes before sunrise and after sunset at 5:09am and 7:51pm, respectively.
Nautical twilight begins and ends 55 minutes before sunrise and after sunset at 5:38am and 7:21pm, respectively.
Civil twilight begins and ends 25 minutes before sunrise and after sunset at 6:09am and 6:51pm, respectively.
Solar twilight begins and ends 33 minutes after sunrise and before sunset at 7:08am and 5:52pm, respectively.
The median cloud cover is 0% (clear) and does not vary substantially over the course of the day.
On average, the sky is clear or mostly clear 91% of the time, partly cloudy 2% of the time, and mostly cloudy or overcast 5% of the time.
There is a 8% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.005". Among only those days for which there is at least some measured precipitation, the average is 0.130" and the total rarely exceeds 0.131".
When precipitation does occur it is most often in the form of slight rain (45% of days with precipitation have at worst slight rain), thunderstorms (37%), and moderate rain (15%).
Precipitation is most likely around 2pm and least likely around midnight.
There is a 5% chance that there will be snow on the ground. The average snow depth is 1.3". The snow depth is deeper than 1.5" one year in four and deeper than 1.6" one year in ten.
The relative humidity typically ranges from 19% (dry) to 34% (comfortable), rarely dropping below 8% (very dry), or exceeding 51% (mildly humid).
The air is driest at 4pm, at which time the relative humidity is less than 22% (dry) three days out of four; it is most humid at 6am, exceeding 24% (dry) three days out of four.
The dew point ranges from 34°F to 37°F with an average of 35°F.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.
The wind speed is 7 mph (light breeze) on average and is rarely outside the range 2 mph to 13 mph (light air to moderate breeze). The wind speed does not vary substantially during the course of the day.
The wind is most often out of the north west (18% of the time), north (11% of the time), and south (11% of the time). The wind is least often out of the north east (3% of the time).