This report describes the typical weather at the Tucson International Airport (Tucson, Arizona, United States) weather station over the course of an average March. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Tucson, Arizona has a hot semi-arid steppe climate. The area within 25 mi of this station is covered by shrublands (70%), grasslands (23%), forests (4%), and built-up areas (3%).
The month of March is characterized by rising daily high temperatures, with daily highs increasing from 71°F to 77°F over the course of the month, exceeding 87°F or dropping below 59°F only one day in ten.
Over the course of March, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 59 minutes, implying an average day-over-day increase of 1.9 minutes.
The shortest day of the month is March 1 with 11:32 hours of daylight; the longest day is March 31 with 12:31 hours of daylight.
The earliest sunrise is at 6:12am on March 31; the latest sunset is at 6:43pm on March 31; the latest sunrise is at 6:50am on March 1; the earliest sunset is at 6:22pm on March 1.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 5% (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 68% of the time, partly cloudy 10% of the time, and mostly cloudy or overcast 20% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around March 1, occurring in 17% of days. Precipitation is least likely around March 30, occurring in 12% of days.
Throughout March, the most common forms of precipitation are light rain, moderate rain, and thunderstorms.
Light rain is the most severe precipitation observed during 49% of those days with precipitation. It is most likely around March 1, when it is observed during 8% of all days.
Moderate rain is the most severe precipitation observed during 29% of those days with precipitation. It is most likely around March 5, when it is observed during 5% of all days.
Thunderstorms are the most severe precipitation observed during 13% of those days with precipitation. They are most likely around March 2, when it is observed during 2% of all days.
Either snow is exceptionally unlikely to fall at this location in March or this station does not reliably report precipitation types.
The relative humidity typically ranges from 15% (dry) to 65% (mildly humid) over the course of a typical March, rarely dropping below 7% (very dry) and reaching as high as 99% (very humid).
The air is driest around March 31, at which time the relative humidity drops below 19% (dry) three days out of four; it is most humid around March 1, rising above 45% (comfortable) 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 20°F (dry) to 35°F (dry) and is rarely below 6°F (dry) or above 46°F (dry).
Over the course of March typical wind speeds vary from 0 mph to 16 mph (calm to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around March 31, at which time the average daily maximum wind speed is 16 mph (moderate breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around March 2, at which time the average daily maximum wind speed is 14 mph (moderate breeze).