This report describes the typical weather at the Charlottetown Airport (Charlottetown, Prince Edward Island, Canada) weather station over the course of an average May. It is based on the historical records from 1977 to 2012. Earlier records are either unavailable or unreliable.
Charlottetown, Prince Edward Island has a humid continental climate with warm summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (46%), croplands (40%), forests (8%), lakes and rivers (4%), and grasslands (3%).
The month of May is characterized by rapidly rising daily high temperatures, with daily highs increasing from 52°F to 61°F over the course of the month, exceeding 72°F or dropping below 41°F only one day in ten.
Over the course of May, 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 May 1 with 14:24 hours of daylight; the longest day is May 31 with 15:32 hours of daylight.
The earliest sunrise is at 5:25am on May 30; the latest sunset is at 8:57pm on May 31; the latest sunrise is at 5:58am on May 1; the earliest sunset is at 8:22pm 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 90% (mostly cloudy) and does not vary substantially over the course of the month.
On May 16, a representative day, the sky is clear or mostly clear 25% of the time, partly cloudy 6% of the time, and mostly cloudy or overcast 64% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around May 2, occurring in 60% of days. Precipitation is least likely around May 30, occurring in 56% of days.
Throughout May, the most common forms of precipitation are light rain, moderate rain, and light snow.
Light rain is the most severe precipitation observed during 47% of those days with precipitation. It is most likely around May 31, when it is observed during 29% of all days.
Moderate rain is the most severe precipitation observed during 27% of those days with precipitation. It is most likely around May 27, when it is observed during 16% of all days.
Light snow is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around May 1, when it is observed during 13% of all days.
The likelihood of snow falling is highest around May 1, occurring in 17% of days.
Accumulation at this location in May is very unlikely. The chances of there being snow on the ground are highest around May 1, occurring 9% of the time.
The snow is typically at its deepest on May 14, with a median depth of 1.5"; the depth exceeds 2.2" only one year out of ten.
The relative humidity typically ranges from 56% (mildly humid) to 93% (very humid) over the course of a typical May, rarely dropping below 32% (comfortable) and reaching as high as 100% (very humid).
The air is driest around May 2, at which time the relative humidity drops below 70% (mildly humid) three days out of four; it is most humid around May 30, rising above 89% (very 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 50°F (very comfortable) and is rarely below 21°F (dry) or above 59°F (comfortable).
Over the course of May typical wind speeds vary from 3 mph to 17 mph (light air to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 11 mph (gentle breeze) occurs around May 1, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 10 mph (gentle breeze) occurs around May 30, at which time the average daily maximum wind speed is 16 mph (moderate breeze).