This report describes the typical weather at the Myrtle Beach International Airport (Myrtle Beach, South Carolina, United States) weather station over the course of an average April 15. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Myrtle Beach, South 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 oceans and seas (42%), forests (31%), croplands (18%), and grasslands (7%).
The temperature typically varies from 55°F to 70°F and is rarely below 44°F or above 78°F.
The coolest hours of the day are from 2am to 8am with the coldest at 6am, at which time the temperature is below 63°F three days out of four.
The warmest hours of the day are from 11am to 6pm with the hottest at 2pm, at which time the temperature is above 65°F three days out of four.
The day has gained half its heat by 10am and lost it again by 9pm.
On April 15 the Sun rises at 6:44am and sets at 7:47pm.
Solar noon is at 1:15pm.
For reference, on the longest day of the year the Sun rises at 6:05am and sets at 8:29pm, while on the shortest day of the year it rises at 7:16am and sets at 5:11pm.
Astronomical twilight begins and ends 87 minutes before sunrise and after sunset at 5:17am and 9:15pm, respectively.
Nautical twilight begins and ends 56 minutes before sunrise and after sunset at 5:48am and 8:43pm, respectively.
Civil twilight begins and ends 26 minutes before sunrise and after sunset at 6:19am and 8:13pm, respectively.
Solar twilight begins and ends 33 minutes after sunrise and before sunset at 7:18am and 7:14pm, respectively.
The median cloud cover ranges from 26% (mostly clear) to 59% (partly cloudy).
At 1am, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 59% of the time, and overcast or mostly cloudy 31% of the time.
At noon, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 62% of the time, and clear or mostly clear 31% of the time.
The sky is typically clearing in earnest by 10pm.
The clouds have typically started forming in earnest by 6am.
There is a 27% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.007". Among only those days for which there is at least some measured precipitation, the average is 0.133" and the total rarely exceeds 0.198".
When precipitation does occur it is most often in the form of thunderstorms (42% of days with precipitation have at worst thunderstorms), slight rain (41%), and moderate rain (12%).
Precipitation is most likely around 5pm and least likely around 2am.
Either snow is exceptionally unlikely to fall at this location on April 15 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 56% (mildly humid) to 80% (humid), rarely dropping below 33% (comfortable), or exceeding 94% (very humid).
The air is driest at 2pm, at which time the relative humidity is less than 69% (mildly humid) three days out of four; it is most humid at 5am, exceeding 73% (humid) three days out of four.
The dew point ranges from 49°F to 52°F with an average of 51°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 12 mph (light 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 8 mph to 18 mph (gentle breeze to fresh breeze).
The wind is most calm around 4am, rarely exceeding 11 mph (gentle breeze).
The wind is most often out of the south (23% of the time), west (11% of the time), south west (11% of the time), and north (11% of the time). The wind is least often out of the north east (4% of the time).