Average Weather in October in Rio Branco Brazil
Daily high temperatures are around 90°F, rarely falling below 82°F or exceeding 98°F.
Daily low temperatures are around 72°F, rarely falling below 67°F or exceeding 76°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 October
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on October. 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 October
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 October in Rio Branco experiences rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 60% to 74%.
The clearest day of the month is October 1, with clear, mostly clear, or partly cloudy conditions 40% 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 October
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 October is very rapidly increasing, starting the month at 45% and ending it at 61%.
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 October
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during October in Rio Branco is very rapidly increasing, starting the month at 4.1 inches, when it rarely exceeds 6.0 inches or falls below 2.6 inches, and ending the month at 6.5 inches, when it rarely exceeds 9.1 inches or falls below 4.1 inches.
Average Monthly Rainfall in October
Over the course of October in Rio Branco, the length of the day is gradually increasing. From the start to the end of the month, the length of the day increases by 16 minutes, implying an average daily increase of 32 seconds, and weekly increase of 3 minutes, 45 seconds.
The shortest day of the month is October 1, with 12 hours, 11 minutes of daylight and the longest day is October 31, with 12 hours, 28 minutes of daylight.
Hours of Daylight and Twilight in October
The latest sunrise of the month in Rio Branco is 5:15 AM on October 1 and the earliest sunrise is 14 minutes earlier at 5:01 AM on October 31.
The earliest sunset is 5:26 PM on October 9 and the latest sunset is 2 minutes, 17 seconds later at 5:28 PM on October 31.
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 October
The figure below presents a compact representation of key lunar data for October 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 October
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 Rio Branco is increasing during October, rising from 94% to 99% 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 October
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 Rio Branco is essentially constant during October, 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 October
The hourly average wind direction in Rio Branco throughout October is predominantly from the north, with a peak proportion of 67% on October 27.
Wind Direction in October
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 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 October
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 Rio Branco are rapidly increasing during October, increasing by 868°F, from 2,502°F to 3,370°F, over the course of the month.
Growing Degree Days in October
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 Rio Branco is essentially constant during October, remaining within 0.1 kWh of 5.7 kWh throughout.
The highest average daily incident shortwave solar energy during October is 5.8 kWh on October 5.
Average Daily Incident Shortwave Solar Energy in October
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.
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.
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.