This report describes the typical weather at the Dallas-Fort Worth International Airport (Dallas & Fort Worth, Texas, United States) weather station over the course of an average February 17. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Dallas & Fort Worth, Texas 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 (72%), built-up areas (23%), and lakes and rivers (4%).
The temperature typically varies from 43°F to 59°F and is rarely below 30°F or above 74°F.
The coolest hours of the day are from 2am to 9am with the coldest at 7am, at which time the temperature is below 50°F three days out of four.
The warmest hours of the day are from 1pm to 6pm with the hottest at 4pm, at which time the temperature is above 51°F three days out of four.
The day has gained half its heat by 11am and lost it again by 9pm.
On February 17 the Sun rises at 7:10am and sets at 6:14pm.
Solar noon is at 12:42pm.
For reference, on the longest day of the year the Sun rises at 6:20am and sets at 8:39pm, while on the shortest day of the year it rises at 7:26am and sets at 5:26pm.
Astronomical twilight begins and ends 82 minutes before sunrise and after sunset at 5:47am and 7:37pm, respectively.
Nautical twilight begins and ends 54 minutes before sunrise and after sunset at 6:15am and 7:08pm, respectively.
Civil twilight begins and ends 25 minutes before sunrise and after sunset at 6:45am and 6:40pm, respectively.
Solar twilight begins and ends 33 minutes after sunrise and before sunset at 7:44am and 5:41pm, respectively.
The median cloud cover ranges from 53% (partly cloudy) to 75% (partly cloudy).
At midnight, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 59% of the time, and overcast or mostly cloudy 41% of the time.
At 10am, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 66% of the time, and clear or mostly clear 34% of the time.
The sky is typically clearing in earnest by 7pm.
The clouds have typically started forming in earnest by 5am.
There is a 31% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.074". Among only those days for which there is at least some measured precipitation, the average is 0.373" and the total rarely exceeds 0.781".
When precipitation does occur it is most often in the form of slight rain (34% of days with precipitation have at worst slight rain), thunderstorms (26%), moderate rain (16%), drizzle (9%), slight snow (6%), and heavy snow (5%).
Precipitation is most likely around 7am and least likely around 9pm.
Either snow is exceptionally unlikely to fall at this location on February 17 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 52% (mildly humid) to 78% (humid), rarely dropping below 25% (dry), or exceeding 96% (very humid).
The air is driest at 4pm, at which time the relative humidity is less than 68% (mildly humid) three days out of four; it is most humid at 6am, exceeding 69% (mildly humid) three days out of four.
The dew point ranges from 36°F to 38°F with an average of 37°F.
For reference, comfortable indoor conditions should have a relative humidity between 30% and 50% with a dew point of less than 65°F.
Sustained wind speeds typically vary from 10 mph to 14 mph (gentle breeze to moderate breeze) over the course of the day.
The peak sustained wind speed typically occurs around 3pm and is rarely outside the range 6 mph to 22 mph (light breeze to fresh breeze).
The wind is most calm around 7am, rarely exceeding 16 mph (moderate breeze).
The wind is most often out of the south (29% of the time), north (23% of the time), and north west (11% of the time). The wind is least often out of the west (5% of the time).