Average Weather in Callao Peru
In Callao, the summers are warm, muggy, arid, and overcast and the winters are long, cool, dry, windy, and mostly clear. Over the course of the year, the temperature typically varies from 60°F to 80°F and is rarely below 57°F or above 85°F.
Based on the tourism score, the best times of year to visit Callao for warm-weather activities are from early April to late September and from mid to late November.
The warm season lasts for 3.0 months, from January 3 to April 4, with an average daily high temperature above 77°F. The hottest day of the year is February 20, with an average high of 80°F and low of 70°F.
The cool season lasts for 4.2 months, from June 12 to October 18, with an average daily high temperature below 68°F. The coldest day of the year is August 23, with an average low of 60°F and high of 65°F.
Average High and Low Temperature
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, 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 Callao, the average percentage of the sky covered by clouds experiences extreme seasonal variation over the course of the year.
The clearer part of the year in Callao begins around April 16 and lasts for 6.2 months, ending around October 23. On August 4, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 74% of the time, and overcast or mostly cloudy 26% of the time.
The cloudier part of the year begins around October 23 and lasts for 5.8 months, ending around April 16. On February 20, the cloudiest day of the year, the sky is overcast or mostly cloudy 79% of the time, and clear, mostly clear, or partly cloudy 21% of the time.
Cloud Cover Categories
Callao does not experience significant seasonal variation in the frequency of wet days (i.e., those with greater than 0.04 inches of liquid or liquid-equivalent precipitation). The frequency ranges from 0% to 1%, with an average value of 0%.
Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 1% on January 25.
Daily Chance of Precipitation
The length of the day in Callao does not vary substantially over the course of the year, staying within 50 minutes of 12 hours throughout. In 2018, the shortest day is June 21, with 11 hours, 25 minutes of daylight; the longest day is December 21, with 12 hours, 50 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:32 AM on November 19, and the latest sunrise is 57 minutes later at 6:30 AM on July 11. The earliest sunset is at 5:50 PM on May 30, and the latest sunset is 51 minutes later at 6:41 PM on January 24.
Daylight saving time (DST) is not observed in Callao during 2018.
Sunrise & Sunset with Twilight
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.
Callao experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.1 months, from December 20 to April 23, during which time the comfort level is muggy, oppressive, or miserable at least 22% of the time. The muggiest day of the year is February 13, with muggy conditions 86% of the time.
The least muggy day of the year is October 17, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
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 experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.1 months, from May 6 to December 9, with average wind speeds of more than 9.2 miles per hour. The windiest day of the year is August 6, with an average hourly wind speed of 10.7 miles per hour.
The calmer time of year lasts for 4.9 months, from December 9 to May 6. The calmest day of the year is March 1, with an average hourly wind speed of 7.7 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Callao is from the south throughout the year.
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 water temperature experiences some seasonal variation over the course of the year.
The time of year with warmer water lasts for 2.8 months, from January 7 to March 31, with an average temperature above 69°F. The day of the year with the warmest water is February 21, with an average temperature of 71°F.
The time of year with cooler water lasts for 3.9 months, from July 16 to November 13, with an average temperature below 64°F. The day of the year with the coolest water is September 22, with an average temperature of 62°F.
Average Water Temperature
Best Time of Year to Visit
To characterize how pleasant the weather is in Callao throughout the year, we compute two travel scores.
The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best times of year to visit Callao for general outdoor tourist activities are from early April to late September and from mid to late November, with a peak score in the first week of May.
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit Callao for hot-weather activities is from late December to mid April, with a peak score in the first week of February.
For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.
Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.
Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.
Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.
Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.
Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).
Temperatures in Callao are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.
Time Spent in Various Temperature Bands and the Growing Season
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.
Growing Degree Days
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 experiences some seasonal variation over the course of the year.
The brighter period of the year lasts for 3.0 months, from September 8 to December 6, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest day of the year is October 2, with an average of 7.3 kWh.
The darker period of the year lasts for 2.3 months, from May 13 to July 23, with an average daily incident shortwave energy per square meter below 6.0 kWh. The darkest day of the year is June 21, with an average of 5.6 kWh.
Average Daily Incident Shortwave Solar Energy
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%).
This report illustrates the typical weather in Callao, 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.
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.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.