Average Weather In April For Tulsa, Oklahoma, USA

Location

This report describes the typical weather at the Tulsa International Airport (Tulsa, Oklahoma, 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.

Tulsa, Oklahoma has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by grasslands (79%), forests (11%), built-up areas (7%), and lakes and rivers (3%).

Temperature

The month of April is characterized by rising daily high temperatures, with daily highs increasing from 67°F to 75°F over the course of the month, exceeding 84°F or dropping below 53°F only one day in ten.

Daily High and Low Temperature in April

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 46°F to 55°F, falling below 35°F or exceeding 66°F only one day in ten.

Fraction of Time Spent in Various Temperature Bands in April

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 April, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 1:03 hours, implying an average day-over-day increase of 2.1 minutes.

The shortest day of the month is April 1 with 12:37 hours of daylight; the longest day is April 30 with 13:40 hours of daylight.

Daily Hours of Daylight and Twilight in April

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 6:32am on April 30; the latest sunset is at 8:11pm on April 30; the latest sunrise is at 7:09am on April 1; the earliest sunset is at 7:46pm 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.

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

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 61% (partly cloudy) and does not vary substantially over the course of the month.

Median Cloud Cover in April

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 April 15, a representative day, the sky is clear or mostly clear 39% of the time, partly cloudy 13% of the time, and mostly cloudy or overcast 45% of the time.

Cloud Cover Types in April

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 40%, with little variation over the course of the month.

Probability of Precipitation at Some Point in the Day in April

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 April, the most common forms of precipitation are thunderstorms, light rain, and moderate rain.

Thunderstorms are the most severe precipitation observed during 46% of those days with precipitation. They are most likely around April 29, when it is observed during 21% of all days.

Light rain is the most severe precipitation observed during 31% of those days with precipitation. It is most likely around April 6, when it is observed during 13% of all days.

Moderate rain is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around April 3, when it is observed during 6% of all days.

Types of Precipitation Throughout April

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

Snow

The likelihood of snow falling is highest around April 1, occurring in 2% of days.

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

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

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

Humidity

The relative humidity typically ranges from 39% (comfortable) to 88% (very humid) over the course of a typical April, rarely dropping below 21% (dry) and reaching as high as 100% (very humid).

The air is driest around April 8, at which time the relative humidity drops below 49% (comfortable) three days out of four; it is most humid around April 30, rising above 82% (humid) three days out of four.

Relative Humidity in April

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 April, the dew point typically varies from 35°F (dry) to 57°F (comfortable) and is rarely below 22°F (dry) or above 67°F (muggy).

Dew Point in April

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 April typical wind speeds vary from 2 mph to 19 mph (light air to fresh breeze), rarely exceeding 27 mph (strong breeze).

The highest average wind speed of 12 mph (gentle breeze) occurs around April 1, at which time the average daily maximum wind speed is 19 mph (fresh breeze).

The lowest average wind speed of 11 mph (gentle breeze) occurs around April 29, at which time the average daily maximum wind speed is 18 mph (fresh breeze).

Wind Speed in April

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 south (35% of the time), north (17% of the time), and south east (11% of the time). The wind is least often out of the west (5% of the time).

Wind Directions in April

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 April

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.