Average Weather In March For Annapolis, Maryland, USA

Location

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%).

Temperature

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.

Daily High and Low Temperature in March

The daily average low (blue) and high (red) temperature with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
Daily low temperatures range from 34°F to 44°F, falling below 27°F or exceeding 51°F only one day in ten.

Fraction of Time Spent in Various Temperature Bands in March

The average fraction of time spent in various temperature bands: frigid (below 15°F), freezing (15°F to 32°F), cold (32°F to 50°F), cool (50°F to 65°F), comfortable (65°F to 75°F), warm (75°F to 85°F), hot (85°F to 100°F) and sweltering (above 100°F).

Sun

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.

Daily Hours of Daylight and Twilight in March

The number of hours during which the Sun is visible (black line), with various degrees of daylight, twilight, and night, indicated by the color bands. From bottom (most yellow) to top (most gray): full daylight, solar twilight (Sun is visible but less than 6° from the horizon), civil twilight (Sun is not visible but is less than 6° below the horizon), nautical twilight (Sun is between 6° and 12° below the horizon), astronomical twilight (Sun is between 12° and 18° below the horizon), and full night.

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.

Daily Sunrise & Sunset with Twilight and Daylight Savings Time in March

The solar day over the course of the year 2012 . From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (solar, civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight savings time are indicated by the "DST" labels.

Clouds

The median cloud cover is 26% (mostly clear) and does not vary substantially over the course of the month.

Median Cloud Cover in March

The median daily cloud cover (black line) with percentile bands (inner band from 40th to 60th percentile, outer band from 25th to 75th percentile).

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.

Cloud Cover Types in March

The fraction of time spent in each of the five sky cover categories. From top (most blue) to bottom (most gray), the categories are clear, mostly clear, partly cloudy, mostly cloudy, and overcast. Pink indicates missing data. Outside of the United States clear skies are often reported ambiguously, leading them to be lumped in with the missing data.

Precipitation

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.

Probability of Precipitation at Some Point in the Day in March

The fraction of days in which various types of precipitation are observed. If more than one type of precipitation is reported in a given day, the more severe precipitation is counted. For example, if light rain is observed in the same day as a thunderstorm, that day counts towards the thunderstorm totals. The order of severity is from the top down in this graph, with the most severe at the bottom.

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.

Types of Precipitation Throughout March

Relative frequency of various types of precipitation over the course of a typical March.

Snow

The likelihood of snow falling is highest around March 1, occurring in 10% of days.

Probability of Snow Fall Being Reported in a Given Day in March

Probability that snow will be reported at least once in a given day.

Either snow rarely accumulates at this location in March or snow depth measurements are unavailable or unreliable.

Humidity

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.

Relative Humidity in March

The average daily high (blue) and low (brown) relative humidity with percentile bands (inner bands from 25th to 75th percentile, outer bands from 10th to 90th percentile).

Dew Point

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).

Dew Point in March

The daily average low (blue) and high (red) dew point with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).

Wind

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).

Wind Speed in March

The average daily minimum (red), maximum (green), and average (black) wind speed with percentile bands (inner band from 25th to 75th percentile, outer band from 10th to 90th percentile).
The wind is most often out of the north west (15% of the time), south (13% of the time), south east (12% of the time), and north (11% of the time). The wind is least often out of the south west (3% of the time).

Wind Directions in March

The fraction of time spent with the wind blowing from the various directions over the entire year. Values do not sum to 100% because the wind direction is undefined when the wind speed is zero.

Fraction of Time Spent with Various Wind Directions in March

The fraction of time spent with the wind blowing from the various directions on a daily basis. Stacked values do not always sum to 100% because the wind direction is undefined when the wind speed is zero.