This report describes the typical weather at the Canyonlands Field (Moab, Utah, United States) weather station over the course of an average May. It is based on the historical records from 1998 to 2012. Earlier records are either unavailable or unreliable.
Moab, Utah has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by shrublands (98%).
The month of May is characterized by rapidly rising daily high temperatures, with daily highs increasing from 72°F to 84°F over the course of the month, exceeding 94°F or dropping below 60°F only one day in ten.
Over the course of May, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 51 minutes, implying an average day-over-day increase of 1.6 minutes.
The shortest day of the month is May 1 with 13:51 hours of daylight; the longest day is May 31 with 14:42 hours of daylight.
The earliest sunrise is at 5:56am on May 30; the latest sunset is at 8:38pm on May 31; the latest sunrise is at 6:21am on May 1; the earliest sunset is at 8:12pm on May 1.
Daylight saving time is observed in 2012 but it neither starts nor ends in May, so the entire month is in daylight time.
The median cloud cover is 1% (clear) and does not vary substantially over the course of the month.
On May 16, a representative day, the sky is clear or mostly clear 79% of the time, partly cloudy 3% of the time, and mostly cloudy or overcast 11% of the time.
The average probability that some form of precipitation will be observed in a given day is 19%, with little variation over the course of the month.
Throughout May, the most common forms of precipitation are light rain, thunderstorms, and moderate rain.
Light rain is the most severe precipitation observed during 46% of those days with precipitation. It is most likely around May 1, when it is observed during 10% of all days.
Thunderstorms are the most severe precipitation observed during 40% of those days with precipitation. They are most likely around May 31, when it is observed during 9% of all days.
Moderate rain is the most severe precipitation observed during 10% of those days with precipitation. It is most likely around May 5, when it is observed during 2% of all days.
Either snow is exceptionally unlikely to fall at this location in May or this station does not reliably report precipitation types.
The relative humidity typically ranges from 13% (very dry) to 54% (mildly humid) over the course of a typical May, rarely dropping below 6% (very dry), or exceeding 84% (humid).
The air is driest around May 30, at which time the relative humidity drops below 15% (dry) three days out of four; it is most humid around May 1, rising above 36% (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 May, the dew point typically varies from 16°F (dry) to 35°F (dry) and is rarely below 4°F (dry) or above 46°F (dry).
Over the course of May typical wind speeds vary from 0 mph to 20 mph (calm to fresh breeze), rarely exceeding 28 mph (strong breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around May 31, at which time the average daily maximum wind speed is 20 mph (fresh breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around May 22, at which time the average daily maximum wind speed is 19 mph (fresh breeze).