Climate and Average Weather Year Round in Barro Alto Brazil

In Barro Alto, the summers are short, hot, and partly cloudy and the winters are short, comfortable, dry, windy, and mostly clear. Over the course of the year, the temperature typically varies from 60°F to 93°F and is rarely below 57°F or above 98°F.

Based on the tourism score, the best time of year to visit Barro Alto for warm-weather activities is from early June to early September.

The hot season lasts for 1.7 months, from September 15 to November 5, with an average daily high temperature above 91°F. The hottest month of the year in Barro Alto is October, with an average high of 93°F and low of 65°F.

The cool season lasts for 2.4 months, from May 31 to August 10, with an average daily high temperature below 86°F. The coldest month of the year in Barro Alto is July, with an average low of 60°F and high of 85°F.

In Barro Alto, 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 Barro Alto begins around May 9 and lasts for 5.3 months, ending around October 17.

The clearest month of the year in Barro Alto is July, during which on average the sky is clear, mostly clear, or partly cloudy 75% of the time.

The cloudier part of the year begins around October 17 and lasts for 6.7 months, ending around May 9.

The cloudiest month of the year in Barro Alto is December, during which on average the sky is overcast or mostly cloudy 73% of the time.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Barro Alto varies significantly throughout the year.

The wetter season lasts 5.5 months, from October 26 to April 11, with a greater than 18% chance of a given day being a wet day. The month with the most wet days in Barro Alto is December, with an average of 9.9 days with at least 0.04 inches of precipitation.

The drier season lasts 6.5 months, from April 11 to October 26. The month with the fewest wet days in Barro Alto is August, with an average of 0.6 days with at least 0.04 inches of precipitation.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in Barro Alto is December, with an average of 9.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 34% on December 4.

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. Barro Alto experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.4 months, from September 28 to May 9, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain in Barro Alto is December, with an average rainfall of 3.8 inches.

The rainless period of the year lasts for 4.6 months, from May 9 to September 28. The month with the least rain in Barro Alto is July, with an average rainfall of 0.1 inches.

The length of the day in Barro Alto does not vary substantially over the course of the year, staying within 49 minutes of 12 hours throughout. In 2024, the shortest day is June 20, with 11 hours, 26 minutes of daylight; the longest day is December 21, with 12 hours, 49 minutes of daylight.

The earliest sunrise is at 5:12 AM on November 18, and the latest sunrise is 56 minutes later at 6:08 AM on July 11. The earliest sunset is at 5:29 PM on May 29, and the latest sunset is 50 minutes later at 6:19 PM on January 24.

Daylight saving time (DST) is not observed in Barro Alto during 2024.

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

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.

Barro Alto experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 6.7 months, from October 24 to May 13, during which time the comfort level is muggy, oppressive, or miserable at least 11% of the time. The month with the most muggy days in Barro Alto is March, with 12.5 days that are muggy or worse.

The month with the fewest muggy days in Barro Alto is July, with 0.0 days that are muggy or worse.

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 Barro Alto experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.2 months, from May 26 to October 31, with average wind speeds of more than 9.9 miles per hour. The windiest month of the year in Barro Alto is September, with an average hourly wind speed of 11.9 miles per hour.

The calmer time of year lasts for 6.8 months, from October 31 to May 26. The calmest month of the year in Barro Alto is January, with an average hourly wind speed of 7.9 miles per hour.

The predominant average hourly wind direction in Barro Alto is from the east throughout the year.

To characterize how pleasant the weather is in Barro Alto 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 time of year to visit Barro Alto for general outdoor tourist activities is from early June to early September, with a peak score in the second week of July.

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 Barro Alto for hot-weather activities is from late April to mid October, with a peak score in the third week of September.

Methodology

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 Barro Alto 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.

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 2.2 months, from August 30 to November 5, with an average daily incident shortwave energy per square meter above 6.9 kWh. The brightest month of the year in Barro Alto is September, with an average of 7.1 kWh.

The darker period of the year lasts for 2.4 months, from May 6 to July 18, with an average daily incident shortwave energy per square meter below 5.9 kWh. The darkest month of the year in Barro Alto is June, with an average of 5.6 kWh.

For the purposes of this report, the geographical coordinates of Barro Alto are -11.761 deg latitude, -41.912 deg longitude, and 2,300 ft elevation.

The topography within 2 miles of Barro Alto contains only modest variations in elevation, with a maximum elevation change of 226 feet and an average elevation above sea level of 2,396 feet. Within 10 miles contains only modest variations in elevation (1,276 feet). Within 50 miles contains very significant variations in elevation (4,364 feet).

The area within 2 miles of Barro Alto is covered by shrubs (31%), grassland (28%), trees (21%), and cropland (20%), within 10 miles by shrubs (36%) and grassland (23%), and within 50 miles by shrubs (41%) and trees (28%).