This report describes the typical weather at the Fresno Yosemite International Airport (Fresno, California, 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.
Fresno, California has a cold semi-arid steppe climate. The area within 25 mi of this station is covered by grasslands (57%), croplands (28%), forests (11%), and built-up areas (2%).
The month of April is characterized by rising daily high temperatures, with daily highs increasing from 70°F to 78°F over the course of the month, exceeding 90°F or dropping below 59°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 1:04 hours, implying an average day-over-day increase of 2.1 minutes.
The shortest day of the month is April 1 with 12:38 hours of daylight; the longest day is April 30 with 13:42 hours of daylight.
The earliest sunrise is at 6:05am on April 30; the latest sunset is at 7:47pm on April 30; the latest sunrise is at 6:44am on April 1; the earliest sunset is at 7:22pm 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 26% (mostly clear) to 42% (partly cloudy). The trend is for the sky to be clearing rapidly with the median cloud cover decreasing by 15% from the start to the end of the month.
On April 30, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 72% of the time, and overcast or mostly cloudy 27% of the time.
On April 1, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 51% of the time, and clear or mostly clear 48% 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 23% of days. Precipitation is least likely around April 30, occurring in 14% 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 53% of those days with precipitation. It is most likely around April 1, when it is observed during 12% of all days.
Moderate rain is the most severe precipitation observed during 31% of those days with precipitation. It is most likely around April 1, when it is observed during 7% 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 28% (dry) to 86% (very humid) over the course of a typical April, rarely dropping below 15% (dry) and reaching as high as 95% (very humid).
The air is driest around April 30, at which time the relative humidity drops below 33% (comfortable) three days out of four; it is most humid around April 1, rising above 82% (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 38°F (dry) to 49°F (dry) and is rarely below 27°F (dry) or above 56°F (comfortable).
Over the course of April 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 April 30, 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 April 1, at which time the average daily maximum wind speed is 13 mph (moderate breeze).