This report describes the typical weather at the Raleigh-Durham International Airport (Raleigh, North Carolina, United States) weather station over the course of an average November 20. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Raleigh, North Carolina has a warm humid temperate climate with hot summers and no dry season. The area within 25 mi of this station is covered by forests (74%), croplands (16%), built-up areas (6%), and lakes and rivers (5%).
The temperature typically varies from 43°F to 59°F and is rarely below 29°F or above 72°F.
The coolest hours of the day are from 1am 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 11am to 5pm with the hottest at 3pm, at which time the temperature is above 53°F three days out of four.
The day has gained half its heat by 10am and lost it again by 7pm.
On November 20 the Sun rises at 6:57am and sets at 5:04pm.
Solar noon is at 12:00pm.
For reference, on the longest day of the year the Sun rises at 5:59am and sets at 8:34pm, while on the shortest day of the year it rises at 7:22am and sets at 5:04pm.
Astronomical twilight begins and ends 89 minutes before sunrise and after sunset at 5:27am and 6:34pm, respectively.
Nautical twilight begins and ends 59 minutes before sunrise and after sunset at 5:58am and 6:03pm, respectively.
Civil twilight begins and ends 28 minutes before sunrise and after sunset at 6:28am and 5:32pm, respectively.
Solar twilight begins and ends 37 minutes after sunrise and before sunset at 7:35am and 4:26pm, respectively.
The median cloud cover ranges from 46% (partly cloudy) to 71% (partly cloudy).
At 1am, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 60% of the time, and overcast or mostly cloudy 40% of the time.
At 1pm, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 63% of the time, and clear or mostly clear 37% of the time.
The sky is typically clearing in earnest by 7pm.
The clouds have typically started forming in earnest by 7am.
There is a 38% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.101". Among only those days for which there is at least some measured precipitation, the average is 0.366" and the total rarely exceeds 0.861".
When precipitation does occur it is most often in the form of moderate rain (39% of days with precipitation have at worst moderate rain), slight rain (38%), drizzle (7%), and heavy rain (6%).
Precipitation is observed with more or less equal probability throughout the day.
Either snow is exceptionally unlikely to fall at this location on November 20 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 52% (mildly humid) to 83% (humid), rarely dropping below 29% (dry), or exceeding 98% (very humid).
The air is driest at 3pm, at which time the relative humidity is less than 65% (mildly humid) three days out of four; it is most humid at 6am, exceeding 76% (humid) three days out of four.
The dew point ranges from 38°F to 40°F with an average of 39°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 5 mph to 9 mph (light breeze to gentle breeze) over the course of the day.
The peak sustained wind speed typically occurs around 1pm and is rarely outside the range 4 mph to 15 mph (light breeze to moderate breeze).
The wind is most calm around 4am, rarely exceeding 10 mph (gentle breeze).
The wind is most often out of the south west (16% of the time), north (12% of the time), and south (11% of the time).