This report describes the typical weather at the Nantucket Memorial Airport (Nantucket, Massachusetts, United States) weather station over the course of an average April. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Nantucket, Massachusetts 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 (98%).
The month of April is characterized by rising daily high temperatures, with daily highs increasing from 47°F to 55°F over the course of the month, exceeding 61°F or dropping below 40°F only one day in ten.
Over the course of April, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:15 hours, implying an average day-over-day increase of 2.5 minutes.
The shortest day of the month is April 1 with 12:43 hours of daylight; the longest day is April 30 with 13:59 hours of daylight.
The earliest sunrise is at 5:38am on April 30; the latest sunset is at 7:37pm on April 30; the latest sunrise is at 6:23am on April 1; the earliest sunset is at 7:06pm on April 1.
Daylight savings time is observed in 2012 but it neither starts nor ends in April, so the entire month is in daylight time.
The median cloud cover ranges from 70% (partly cloudy) to 76% (partly cloudy).
On April 15, a representative day, the sky is clear or mostly clear 29% of the time, partly cloudy 10% of the time, and mostly cloudy or overcast 44% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around April 1, occurring in 41% of days. Precipitation is least likely around April 30, occurring in 37% of days.
Throughout April, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 51% of those days with precipitation. It is most likely around April 26, when it is observed during 21% of all days.
Moderate rain is the most severe precipitation observed during 20% of those days with precipitation. It is most likely around April 17, when it is observed during 8% of all days.
The likelihood of snow falling is highest around April 1, occurring in 9% of days.
Either snow rarely accumulates at this location in April or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 58% (mildly humid) to 98% (very humid) over the course of a typical April, rarely dropping below 33% (comfortable) and reaching as high as 100% (very humid).
The air is driest around April 2, at which time the relative humidity drops below 72% (humid) three days out of four; it is most humid around April 30, rising above 99% (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 April, the dew point typically varies from 28°F (dry) to 46°F (dry) and is rarely below 15°F (dry) or above 53°F (very comfortable).
Over the course of April typical wind speeds vary from 6 mph to 21 mph (light breeze to fresh breeze), rarely exceeding 28 mph (strong breeze).
The highest average wind speed of 14 mph (moderate breeze) occurs around April 1, at which time the average daily maximum wind speed is 21 mph (fresh breeze).
The lowest average wind speed of 13 mph (moderate breeze) occurs around April 28, at which time the average daily maximum wind speed is 19 mph (fresh breeze).