Average Weather in May in Rio Branco Brazil
Daily high temperatures are around 87°F, rarely falling below 80°F or exceeding 92°F. The lowest daily average high temperature is 87°F on May 31.
Daily low temperatures decrease by 2°F, from 72°F to 70°F, rarely falling below 65°F or exceeding 75°F.
For reference, on August 27, the hottest day of the year, temperatures in Rio Branco typically range from 70°F to 91°F, while on July 20, the coldest day of the year, they range from 67°F to 88°F.
Average High and Low Temperature in May
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
Bogor, Indonesia (11,245 miles away); Katabu, Indonesia (11,198 miles); and Valencia, Philippines (11,557 miles) are the far-away foreign places with temperatures most similar to Rio Branco (view comparison).
The month of May in Rio Branco experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 67% to 56%.
The clearest day of the month is May 31, with clear, mostly clear, or partly cloudy conditions 44% of the time.
For reference, on February 24, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 84%, while on July 31, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 68%.
Cloud Cover Categories in May
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Rio Branco, the chance of a wet day over the course of May is very rapidly decreasing, starting the month at 51% and ending it at 27%.
For reference, the year's highest daily chance of a wet day is 83% on February 9, and its lowest chance is 12% on July 21.
Probability of Precipitation in May
The average sliding 31-day rainfall during May in Rio Branco is very rapidly decreasing, starting the month at 4.5 inches, when it rarely exceeds 7.1 inches or falls below 2.1 inches, and ending the month at 2.0 inches, when it rarely exceeds 3.5 inches or falls below 0.7 inches.
Average Monthly Rainfall in May
Over the course of May in Rio Branco, the length of the day is essentially constant. The shortest day of the month is May 31, with 11 hours, 35 minutes of daylight and the longest day is May 1, with 11 hours, 45 minutes of daylight.
Hours of Daylight and Twilight in May
The earliest sunrise of the month in Rio Branco is 5:35 AM on May 1 and the latest sunrise is 6 minutes later at 5:41 AM on May 31.
The latest sunset is 5:20 PM on May 1 and the earliest sunset is 4 minutes earlier at 5:16 PM on May 28.
Daylight saving time is not observed in Rio Branco during 2021.
For reference, on December 21, the longest day of the year, the Sun rises at 5:08 AM and sets 12 hours, 43 minutes later, at 5:50 PM, while on June 21, the shortest day of the year, it rises at 5:46 AM and sets 11 hours, 33 minutes later, at 5:19 PM.
Sunrise & Sunset with Twilight in May
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
The chance that a given day will be muggy in Rio Branco is gradually decreasing during May, falling from 95% to 92% over the course of the month.
For reference, on January 3, the muggiest day of the year, there are muggy conditions 100% of the time, while on July 28, the least muggy day of the year, there are muggy conditions 74% of the time.
Humidity Comfort Levels in May
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Rio Branco is essentially constant during May, remaining within 0.1 miles per hour of 1.7 miles per hour throughout.
For reference, on July 26, the windiest day of the year, the daily average wind speed is 2.0 miles per hour, while on March 4, the calmest day of the year, the daily average wind speed is 1.5 miles per hour.
Average Wind Speed in May
The hourly average wind direction in Rio Branco throughout May is predominantly from the south, with a peak proportion of 37% on May 13.
Wind Direction in May
Temperatures in Rio Branco 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
The average accumulated growing degree days in Rio Branco are rapidly increasing during May, increasing by 814°F, from 8,582°F to 9,396°F, over the course of the month.
Growing Degree Days in May
The average daily incident shortwave solar energy in Rio Branco is essentially constant during May, remaining within 0.1 kWh of 4.9 kWh throughout.
Average Daily Incident Shortwave Solar Energy in May
For the purposes of this report, the geographical coordinates of Rio Branco are -9.975 deg latitude, -67.810 deg longitude, and 502 ft elevation.
The topography within 2 miles of Rio Branco contains only modest variations in elevation, with a maximum elevation change of 154 feet and an average elevation above sea level of 464 feet. Within 10 miles also contains only modest variations in elevation (325 feet). Within 50 miles contains only modest variations in elevation (564 feet).
The area within 2 miles of Rio Branco is covered by shrubs (78%), within 10 miles by trees (39%) and shrubs (29%), and within 50 miles by trees (78%) and cropland (12%).
This report illustrates the typical weather in Rio Branco, 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, Rio Branco, in our network suitable to be used as a proxy for the historical temperature and dew point records of Rio Branco.
At a distance of 15 kilometers from Rio Branco, 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 Rio Branco 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.
Time zones for airports and weather stations are provided by AskGeo.com .