This report describes the typical weather at the Salt Lake City International Airport (Salt Lake City, Utah, United States) weather station over the course of an average May. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Salt Lake City, Utah has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by lakes and rivers (29%), forests (23%), grasslands (19%), shrublands (13%), and croplands (10%).
The month of May is characterized by rapidly rising daily high temperatures, with daily highs increasing from 65°F to 76°F over the course of the month, exceeding 87°F or dropping below 53°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 55 minutes, implying an average day-over-day increase of 1.8 minutes.
The shortest day of the month is May 1 with 13:59 hours of daylight; the longest day is May 31 with 14:54 hours of daylight.
The earliest sunrise is at 5:58am on May 31; the latest sunset is at 8:53pm on May 31; the latest sunrise is at 6:26am on May 1; the earliest sunset is at 8:25pm on May 1.
Daylight savings 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 ranges from 55% (partly cloudy) to 71% (partly cloudy). The trend is for the sky to be clearing rapidly with the median cloud cover decreasing by 16% from the start to the end of the month.
On May 31, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 63% of the time, and overcast or mostly cloudy 37% of the time.
On May 1, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 71% of the time, and clear or mostly clear 29% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around May 1, occurring in 42% of days. Precipitation is least likely around May 31, occurring in 35% of days.
Throughout May, the most common forms of precipitation are thunderstorms, light rain, and moderate rain.
Thunderstorms are the most severe precipitation observed during 40% of those days with precipitation. They are most likely around May 21, when it is observed during 17% of all days.
Light rain is the most severe precipitation observed during 33% of those days with precipitation. It is most likely around May 9, when it is observed during 14% of all days.
Moderate rain is the most severe precipitation observed during 14% of those days with precipitation. It is most likely around May 6, when it is observed during 7% of all days.
The likelihood of snow falling is highest around May 1, occurring in 8% of days.
Either snow rarely accumulates at this location in May or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 26% (dry) to 77% (humid) over the course of a typical May, rarely dropping below 13% (very dry), or exceeding 94% (very humid).
The air is driest around May 31, at which time the relative humidity drops below 32% (comfortable) three days out of four; it is most humid around May 1, rising above 68% (mildly humid) 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 29°F (dry) to 47°F (dry) and is rarely below 19°F (dry) or above 55°F (very comfortable).
Over the course of May typical wind speeds vary from 1 mph to 17 mph (light air to moderate breeze), rarely exceeding 25 mph (strong breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around May 2, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around May 25, at which time the average daily maximum wind speed is 16 mph (moderate breeze).