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May Weather in Callao Peru

Daily high temperatures decrease by 4°F, from 73°F to 69°F, rarely falling below 64°F or exceeding 78°F.

Daily low temperatures are around 63°F, rarely falling below 59°F or exceeding 68°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 May in Callao

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 May. 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 May in Callao

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

Câmara de Lobos, Portugal (5,029 miles away) is the far-away foreign place with temperatures most similar to Callao (view comparison).

Compare Callao to another city:

Clouds

The month of May in Callao experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 38% throughout the month.

The clearest day of the month is May 16, with clear, mostly clear, or partly cloudy conditions 63% 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 May in Callao

Cloud Cover Categories in May in Callao1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJunMay 160%May 160%May 3162%May 3162%May 1163%May 1163%May 2163%May 2163%clearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

Sun

Over the course of May in Callao, the length of the day is essentially constant. The shortest day of the month is May 31, with 11 hours, 28 minutes of daylight and the longest day is May 1, with 11 hours, 40 minutes of daylight.

Hours of Daylight and Twilight in May in Callao

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 6:15 AM on May 1 and the latest sunrise is 7 minutes later at 6:22 AM on May 31.

The latest sunset is 5:55 PM on May 1 and the earliest sunset is 5 minutes earlier at 5:50 PM on May 29.

Daylight saving time is not observed in Callao during 2021.

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 May in Callao

The solar day over the course of May. 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.

Moon

The figure below presents a compact representation of key lunar data for May 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in May in Callao

Moon Rise, Set & Phases in May in Callao18152229112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMAprJunApr 119:31 PMApr 119:31 PMApr 2610:32 PMApr 2610:32 PMMay 112:01 PMMay 112:01 PMMay 266:15 AMMay 266:15 AMJun 105:53 AMJun 105:53 AMJun 241:40 PMJun 241:40 PM5:50 AM5:50 AM6:05 PM6:05 PM5:51 PM5:51 PM6:39 AM6:39 AM6:06 AM6:06 AM5:58 PM5:58 PM5:18 PM5:18 PM6:24 AM6:24 AM6:30 AM6:30 AM6:09 PM6:09 PM5:58 PM5:58 PM7:20 AM7:20 AM
The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

Humidity

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 decreasing during May, falling from 14% to 4% 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 May in Callao

Humidity Comfort Levels in May in Callao1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%AprJunMay 114%May 114%May 314%May 314%May 118%May 118%May 215%May 215%muggymuggyhumidhumidcomfortablecomfortabledrydryoppressiveoppressive
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

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 gradually increasing during May, increasing from 9.0 miles per hour to 9.7 miles per hour over the course of the month.

For reference, on August 6, the windiest day of the year, the daily average wind speed is 10.7 miles per hour, while on March 1, the calmest day of the year, the daily average wind speed is 7.7 miles per hour.

Average Wind Speed in May in Callao

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 May is predominantly from the south, with a peak proportion of 100% on May 26.

Wind Direction in May in Callao

northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 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 essentially constant during May, remaining within 1°F of 66°F throughout.

Average Water Temperature in May in Callao

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

Growing Season

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 in May in Callao

Time Spent in Various Temperature Bands and the Growing Season in May in Callao1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%AprJun100%May 16100%May 16coolcomfortablewarm
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within 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.

The average accumulated growing degree days in Callao are rapidly increasing during May, increasing by 493°F, from 5,339°F to 5,832°F, over the course of the month.

Growing Degree Days in May in Callao

Growing Degree Days in May in Callao1815222911223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031315,000°F5,000°F5,200°F5,200°F5,400°F5,400°F5,600°F5,600°F5,800°F5,800°F6,000°F6,000°F6,200°F6,200°F6,400°F6,400°FAprJunMay 15,339°FMay 15,339°FMay 315,832°FMay 315,832°FMay 115,512°FMay 115,512°FMay 215,677°FMay 215,677°F
The average growing degree days accumulated over the course of May, 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 May, remaining within 0.2 kWh of 5.9 kWh throughout.

Average Daily Incident Shortwave Solar Energy in May in Callao

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

Topography

For the purposes of this report, the geographical coordinates of Callao are -12.057 deg latitude, -77.118 deg longitude, and 89 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, 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 Algorithms 2nd Edition , 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 airports 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.

Disclaimer

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.