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Average Weather in January in Callao Peru

In Callao, the month of January is characterized by gradually rising daily high temperatures, with daily highs increasing by 3°F, from 77°F to 80°F over the course of the month, and rarely exceeding 83°F or dropping below 73°F.

Daily low temperatures increase by 2°F, from 68°F to 70°F, rarely falling below 65°F or exceeding 72°F.

For reference, on February 20, the hottest day of the year, temperatures in Callao typically range from 70°F to 80°F, while on August 23, the coldest day of the year, they range from 60°F to 65°F.

Average High and Low Temperature in January

The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on January. The horizontal axis is the day, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in January

Average Hourly Temperature in January in Callao18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM4 AM8 AM12 PM4 PM8 PM12 AMDecFebwarmcomfortable
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.


The month of January in Callao experiences gradually increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 72% to 77%.

The clearest day of the month is January 1, with clear, mostly clear, or partly cloudy conditions 28% of the time.

For reference, on February 20, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 79%, while on August 4, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 74%.

Cloud Cover Categories in January

Cloud Cover Categories in January in Callao1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%DecFebJan 128%Jan 128%Jan 3123%Jan 3123%Jan 1127%Jan 1127%Jan 2125%Jan 2125%clearpartly cloudyovercastmostly clearmostly cloudy
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.


A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Callao, the chance of a wet day over the course of January is essentially constant, remaining around 1% throughout.

For reference, the year's highest daily chance of a wet day is 1% on January 26, and its lowest chance is 0% on September 3.

Probability of Precipitation in January

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).


Over the course of January in Callao, the length of the day is essentially constant. The shortest day of the month is January 31, with 12 hours, 38 minutes of daylight and the longest day is January 1, with 12 hours, 49 minutes of daylight.

Hours of Daylight and Twilight in January

The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise of the month in Callao is 5:47 AM on January 1 and the latest sunrise is 16 minutes later at 6:03 AM on January 31.

The earliest sunset is 6:36 PM on January 1 and the latest sunset is 4 minutes later at 6:41 PM on January 23.

Daylight saving time is not observed in Callao during 2017.

For reference, on December 21, the longest day of the year, the Sun rises at 5:41 AM and sets 12 hours, 50 minutes later, at 6:31 PM, while on June 21, the shortest day of the year, it rises at 6:27 AM and sets 11 hours, 25 minutes later, at 5:52 PM.

Sunrise & Sunset with Twilight in January

The solar day over the course of January. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray.


We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The chance that a given day will be muggy in Callao is very rapidly increasing during January, rising from 44% to 81% over the course of the month.

For reference, on February 13, the muggiest day of the year, there are muggy conditions 86% of the time, while on October 16, the least muggy day of the year, there are muggy conditions 0% of the time.

Humidity Comfort Levels in January

Humidity Comfort Levels in January in Callao1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%10%20%30%40%50%60%70%80%90%100%DecFebJan 144%Jan 144%Jan 3181%Jan 3181%Jan 1160%Jan 1160%Jan 2174%Jan 2174%oppressiveoppressivehumidhumidmuggymuggycomfortablecomfortable
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.


This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in Callao is essentially constant during January, remaining within 0.2 miles per hour of 4.5 miles per hour throughout.

For reference, on August 1, the windiest day of the year, the daily average wind speed is 5.8 miles per hour, while on March 1, the calmest day of the year, the daily average wind speed is 4.1 miles per hour.

Average Wind Speed in January

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.
The hourly average wind direction in Callao throughout January is predominantly from the south, with a peak proportion of 100% on January 1.

Wind Direction in January

Wind Direction in January in Callao1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%DecFebsouth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Water Temperature

Callao is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average surface water temperature in Callao is gradually increasing during January, rising by 2°F, from 69°F to 71°F, over the course of the month.

Average Water Temperature in January

The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy in Callao is essentially constant during January, remaining within 0.1 kWh of 6.5 kWh throughout.

Average Daily Incident Shortwave Solar Energy in January

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.


For the purposes of this report, the geographical coordinates of Callao are -12.057 deg latitude, -77.118 deg longitude, and 49 ft elevation.

The topography within 2 miles of Callao contains only modest variations in elevation, with a maximum elevation change of 226 feet and an average elevation above sea level of 79 feet. Within 10 miles contains only modest variations in elevation (2,687 feet). Within 50 miles contains large variations in elevation (16,132 feet).

The area within 2 miles of Callao is covered by artificial surfaces (62%) and water (14%), within 10 miles by water (58%) and artificial surfaces (30%), and within 50 miles by water (60%) and sparse vegetation (14%).

Data Sources

This report illustrates the typical weather in Callao year round, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There is only a single weather station, Jorge Chávez International Airport, in our network suitable to be used as a proxy for the historical temperature and dew point records of Callao.

At a distance of 4 kilometers from Callao, closer than our threshold of 150 kilometers, this station is deemed sufficiently nearby to be relied upon as our primary source for temperature and dew point records.

The station records are corrected for the elevation difference between the station and Callao according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

Please note that the station records themselves may additionally have been back-filled using other nearby stations or the MERRA-2 reanalysis.

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for aiports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.