This report describes the typical weather at the Jorge Chávez International Airport (Callao/Lima, Peru) weather station over the course of an average January. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Callao/Lima has a hot desert climate. The area within 25 mi of this station is covered by oceans and seas (94%) and built-up areas (3%).
The month of January is characterized by gradually rising daily high temperatures, with daily highs around 79°F throughout the month, exceeding 83°F or dropping below 74°F only one day in ten.
Over the course of January, the length of the day is essentially constant. The shortest day of the month is January 31 with 12:38 hours of daylight; the longest day is January 1 with 12:49 hours of daylight.
The earliest sunrise is at 5:47am on January 1; the latest sunset is at 6:41pm on January 23; the latest sunrise is at 6:03am on January 31; the earliest sunset is at 6:36pm on January 2.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 62% (partly cloudy) and does not vary substantially over the course of the month.
On January 16, a representative day, the sky is clear or mostly clear 25% of the time, partly cloudy 35% of the time, and mostly cloudy or overcast 29% of the time.
The average probability that some form of precipitation will be observed in a given day is 9%, with little variation over the course of the month.
Throughout January, the most common forms of precipitation are light rain and drizzle.
Light rain is the most severe precipitation observed during 47% of those days with precipitation. It is most likely around January 31, when it is observed during 5% of all days.
Drizzle is the most severe precipitation observed during 46% of those days with precipitation. It is most likely around January 1, when it is observed during 6% of all days.
Either snow is exceptionally unlikely to fall at this location in January or this station does not reliably report precipitation types.
The relative humidity typically ranges from 65% (mildly humid) to 96% (very humid) over the course of a typical January, rarely dropping below 57% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around January 28, at which time the relative humidity drops below 68% (mildly humid) three days out of four; it is most humid around January 22, rising above 93% (very humid) three days out of four.
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 January, the dew point typically varies from 63°F (mildy humid) to 68°F (muggy) and is rarely below 61°F (comfortable) or above 70°F (muggy).
Over the course of January typical wind speeds vary from 3 mph to 15 mph (light air to moderate breeze), rarely exceeding 22 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around January 5, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 9 mph (gentle breeze) occurs around January 31, at which time the average daily maximum wind speed is 15 mph (moderate breeze).