Summer Weather in Rio Claro Brazil

Daily high temperatures are around 85°F, rarely falling below 78°F or exceeding 92°F. The highest daily average high temperature is 86°F on February 14.

Daily low temperatures are around 68°F, rarely falling below 61°F or exceeding 71°F. The highest daily average low temperature is 68°F on January 25.

For reference, on February 14, the hottest day of the year, temperatures in Rio Claro typically range from 68°F to 86°F, while on July 20, the coldest day of the year, they range from 52°F to 77°F.

The figure below shows you a compact characterization of the hourly average summer temperatures. 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.

Giyani, South Africa (4,921 miles away) and Ta‘izz, Yemen (6,679 miles) are the far-away foreign places with temperatures most similar to Rio Claro (view comparison).

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The summer in Rio Claro experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 69% throughout the season. The highest chance of overcast or mostly cloudy conditions is 75% on January 16.

The clearest day of the summer is December 1, with clear, mostly clear, or partly cloudy conditions 37% of the time.

For reference, on January 16, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 75%, while on August 26, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 74%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Rio Claro, the chance of a wet day over the course of the summer is essentially constant, remaining around 61% throughout.

For reference, the year's highest daily chance of a wet day is 67% on January 13, and its lowest chance is 8% on August 1.

Rainfall

To show variation within the season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the summer in Rio Claro is gradually decreasing, starting the season at 6.6 inches, when it rarely exceeds 10.0 inches or falls below 4.0 inches, and ending the season at 6.2 inches, when it rarely exceeds 9.5 inches or falls below 2.8 inches.

The highest average 31-day accumulation is 8.8 inches on January 7.

Over the course of the summer in Rio Claro, the length of the day is decreasing. From the start to the end of the season, the length of the day decreases by 52 minutes, implying an average daily decrease of 35 seconds, and weekly decrease of 4 minutes, 5 seconds.

The shortest day of the summer is February 28, with 12 hours, 33 minutes of daylight and the longest day is December 20, with 13 hours, 31 minutes of daylight.

The earliest sunrise of the summer in Rio Claro is 5:17 AM on December 1 and the latest sunrise is 49 minutes later at 6:06 AM on February 28.

The latest sunset is 7:00 PM on January 14 and the earliest sunset is 21 minutes earlier at 6:38 PM on February 28.

Daylight saving time is not observed in Rio Claro during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:23 AM and sets 13 hours, 31 minutes later, at 6:53 PM, while on June 20, the shortest day of the year, it rises at 6:49 AM and sets 10 hours, 46 minutes later, at 5:34 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for the summer of 2024. 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.

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 Claro is very rapidly increasing during the summer, rising from 61% to 84% over the course of the season.

The highest chance of a muggy day during the summer is 86% on February 14.

For reference, on February 14, the muggiest day of the year, there are muggy conditions 86% of the time, while on July 10, the least muggy day of the year, there are muggy conditions 0% of the time.

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 Claro is decreasing during the summer, decreasing from 7.3 miles per hour to 5.8 miles per hour over the course of the season.

For reference, on September 17, the windiest day of the year, the daily average wind speed is 8.5 miles per hour, while on February 26, the calmest day of the year, the daily average wind speed is 5.8 miles per hour.

The hourly average wind direction in Rio Claro throughout the summer is predominantly from the north, with a peak proportion of 41% on February 8.

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 Claro 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.

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 Claro are very rapidly increasing during the summer, increasing by 2,245°F, from 2,950°F to 5,195°F, over the course of the season.

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 Claro is gradually decreasing during the summer, falling by 0.8 kWh, from 6.5 kWh to 5.7 kWh, over the course of the season.

For the purposes of this report, the geographical coordinates of Rio Claro are -22.411 deg latitude, -47.561 deg longitude, and 2,024 ft elevation.

The topography within 2 miles of Rio Claro contains significant variations in elevation, with a maximum elevation change of 535 feet and an average elevation above sea level of 2,006 feet. Within 10 miles contains significant variations in elevation (1,037 feet). Within 50 miles contains very significant variations in elevation (2,080 feet).

The area within 2 miles of Rio Claro is covered by artificial surfaces (62%), shrubs (20%), and trees (13%), within 10 miles by cropland (36%) and trees (22%), and within 50 miles by cropland (40%) and trees (24%).