This report describes the typical weather at the Phoenix-Mesa Gateway Airport (Mesa, Arizona, United States) weather station over the course of an average April. It is based on the historical records from 1999 to 2012. Earlier records are either unavailable or unreliable.
Mesa, Arizona has a hot semi-arid steppe climate. The area within 25 mi of this station is covered by shrublands (80%), grasslands (10%), forests (6%), and croplands (2%).
The month of April is characterized by rising daily high temperatures, with daily highs increasing from 81°F to 89°F over the course of the month, exceeding 98°F or dropping below 70°F only one day in ten.
Over the course of April, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 56 minutes, implying an average day-over-day increase of 1.9 minutes.
The shortest day of the month is April 1 with 12:34 hours of daylight; the longest day is April 30 with 13:30 hours of daylight.
The earliest sunrise is at 5:39am on April 30; the latest sunset is at 7:09pm on April 30; the latest sunrise is at 6:13am on April 1; the earliest sunset is at 6:47pm on April 1.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover ranges from 18% (mostly clear) to 25% (mostly clear). The trend is for the sky to be clearing with the median cloud cover decreasing by 7% from the start to the end of the month.
On April 15, a representative day, the sky is clear or mostly clear 59% of the time, partly cloudy 12% of the time, and mostly cloudy or overcast 19% 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 11% of days. Precipitation is least likely around April 29, occurring in 6% of days.
Throughout April, the most common forms of precipitation are moderate rain, thunderstorms, and light rain.
Moderate rain is the most severe precipitation observed during 36% of those days with precipitation. It is most likely around April 1, when it is observed during 4% of all days.
Thunderstorms are the most severe precipitation observed during 32% of those days with precipitation. They are most likely around April 1, when it is observed during 3% of all days.
Light rain is the most severe precipitation observed during 26% of those days with precipitation. It is most likely around April 1, when it is observed during 3% of all days.
Either snow is exceptionally unlikely to fall at this location in April or this station does not reliably report precipitation types.
The relative humidity typically ranges from 11% (very dry) to 60% (mildly humid) over the course of a typical April, rarely dropping below 6% (very dry), or exceeding 95% (very humid).
The air is driest around April 30, at which time the relative humidity drops below 14% (very dry) three days out of four; it is most humid around April 1, rising above 43% (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 April, the dew point typically varies from 23°F (dry) to 40°F (dry) and is rarely below 12°F (dry) or above 50°F (dry).
Over the course of April typical wind speeds vary from 0 mph to 13 mph (calm to moderate breeze), rarely exceeding 20 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around April 24, at which time the average daily maximum wind speed is 13 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around April 1, at which time the average daily maximum wind speed is 12 mph (moderate breeze).