This report describes the typical weather at the Annapolis (Annapolis, Maryland, United States) weather station over the course of an average March. It is based on the historical records from 2002 to 2012. Earlier records are either unavailable or unreliable.
Annapolis, Maryland has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by oceans and seas (37%), forests (30%), croplands (20%), and built-up areas (12%).
The month of March is characterized by rapidly rising daily high temperatures, with daily highs increasing from 48°F to 57°F over the course of the month, exceeding 70°F or dropping below 38°F only one day in ten.
Over the course of March, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:17 hours, implying an average day-over-day increase of 2.5 minutes.
The shortest day of the month is March 1 with 11:21 hours of daylight; the longest day is March 31 with 12:38 hours of daylight.
The earliest sunrise is at 6:25am on March 10; the latest sunset is at 7:30pm on March 31; the latest sunrise is at 7:23am on March 11; the earliest sunset is at 5:59pm on March 1.
Daylight savings time (DST) starts at 3:00am on March 11, 2012, shifting sunrise and sunset to an hour later.
The median cloud cover is 26% (mostly clear) and does not vary substantially over the course of the month.
On March 16, a representative day, the sky is clear or mostly clear 57% of the time, partly cloudy 3% of the time, and mostly cloudy or overcast 38% of the time.
The average probability that some form of precipitation will be observed in a given day is 37%, with little variation over the course of the month.
Throughout March, the most common forms of precipitation are light rain, moderate rain, and heavy rain.
Light rain is the most severe precipitation observed during 45% of those days with precipitation. It is most likely around March 31, when it is observed during 19% of all days.
Moderate rain is the most severe precipitation observed during 24% of those days with precipitation. It is most likely around March 31, when it is observed during 11% of all days.
Heavy rain is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around March 29, when it is observed during 7% of all days.
The likelihood of snow falling is highest around March 1, occurring in 10% of days.
Either snow rarely accumulates at this location in March or snow depth measurements are unavailable or unreliable.
The relative humidity typically ranges from 44% (comfortable) to 85% (humid) over the course of a typical March, rarely dropping below 27% (dry) and reaching as high as 99% (very humid).
The air is driest around March 1, at which time the relative humidity drops below 52% (mildly humid) three days out of four; it is most humid around March 24, rising above 77% (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 March, the dew point typically varies from 21°F (dry) to 44°F (dry) and is rarely below 10°F (dry) or above 55°F (very comfortable).
Over the course of March typical wind speeds vary from 0 mph to 15 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around March 3, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around March 21, at which time the average daily maximum wind speed is 14 mph (moderate breeze).