This report describes the typical weather at the Cozumel International Airport (Cozumel, Mexico) weather station over the course of an average December 1. It is based on the historical records from 1991 to 2012. Earlier records are either unavailable or unreliable.
Cozumel has a tropical monsoon climate with short dry season. The area within 25 mi of this station is covered by oceans and seas (69%) and forests (30%).
The temperature typically varies from 73°F to 82°F and is rarely below 68°F or above 86°F.
The coolest hours of the day are from 9pm to 8am with the coldest at 6am, at which time the temperature is below 75°F three days out of four.
The warmest hours of the day are from 10am to 4pm with the hottest at 1pm, at which time the temperature is above 80°F three days out of four.
The day has gained half its heat by 9am and lost it again by 6pm.
On December 1 the Sun rises at 6:07am and sets at 5:06pm.
Solar noon is at 11:36am.
For reference, on the longest day of the year the Sun rises at 6:07am and sets at 7:31pm, while on the shortest day of the year it rises at 6:19am and sets at 5:12pm.
Astronomical twilight begins and ends 78 minutes before sunrise and after sunset at 4:49am and 6:24pm, respectively.
Nautical twilight begins and ends 51 minutes before sunrise and after sunset at 5:16am and 5:57pm, respectively.
Civil twilight begins and ends 23 minutes before sunrise and after sunset at 5:43am and 5:30pm, respectively.
Solar twilight begins and ends 32 minutes after sunrise and before sunset at 6:40am and 4:33pm, respectively.
The median cloud cover ranges from 38% (mostly clear) to 70% (partly cloudy).
At 2am, the clearest time of the day, the sky is clear, mostly clear, or partly cloudy 20% of the time, and overcast or mostly cloudy 4% of the time.
At 1pm, the cloudiest time of the day, the sky is overcast, mostly cloudy, or partly cloudy 62% of the time, and clear or mostly clear 6% of the time.
The sky is typically clearing in earnest by 8pm.
The clouds have typically started forming in earnest by 8am.
There is a 24% chance that precipitation will be observed at some point during the day.
The average measured liquid-equivalent quantity of precipitation is 0.004". Among only those days for which there is at least some measured precipitation, the average is 0.407" and the total rarely exceeds 0.407".
When precipitation does occur it is most often in the form of slight rain (46% of days with precipitation have at worst slight rain), moderate rain (36%), thunderstorms (7%), and drizzle (6%).
Precipitation is most likely around 2pm and least likely around 2am.
Either snow is exceptionally unlikely to fall at this location on December 1 or this station does not reliably report precipitation types.
The relative humidity typically ranges from 70% (humid) to 88% (very humid), rarely dropping below 60% (mildly humid), or exceeding 97% (very humid).
The air is driest at 1pm, at which time the relative humidity is less than 75% (humid) three days out of four; it is most humid at 5am, exceeding 83% (humid) three days out of four.
The dew point ranges from 69°F to 71°F with an average of 70°F, which feels muggy no matter what the relative humidity is.
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 gentle breeze) over the course of the day.
The peak sustained wind speed typically occurs around noon and is rarely outside the range 7 mph to 18 mph (light breeze to fresh breeze).
The wind is most calm around 3am, rarely exceeding 12 mph (moderate breeze).
The wind is most often out of the east (17% of the time), north east (14% of the time), and north (12% of the time). The wind is least often out of the south west (0% of the time), west (1% of the time), south (1% of the time), north west (3% of the time), and south east (4% of the time).