Climate and Average Weather Year Round in Castelo Brazil

In Castelo, the wet season is hot, oppressive, and mostly cloudy and the dry season is warm, humid, and mostly clear. Over the course of the year, the temperature typically varies from 62°F to 92°F and is rarely below 56°F or above 97°F.

Based on the tourism score, the best time of year to visit Castelo for warm-weather activities is from mid May to mid September.

The hot season lasts for 2.6 months, from January 1 to March 19, with an average daily high temperature above 90°F. The hottest month of the year in Castelo is February, with an average high of 91°F and low of 72°F.

The cool season lasts for 3.2 months, from May 10 to August 16, with an average daily high temperature below 84°F. The coldest month of the year in Castelo is July, with an average low of 62°F and high of 82°F.

In Castelo, 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 Castelo begins around April 3 and lasts for 6.4 months, ending around October 15.

The clearest month of the year in Castelo is August, 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 15 and lasts for 5.6 months, ending around April 3.

The cloudiest month of the year in Castelo is December, during which on average the sky is overcast or mostly cloudy 76% 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 Castelo varies very significantly throughout the year.

The wetter season lasts 5.5 months, from October 20 to April 3, with a greater than 36% chance of a given day being a wet day. The month with the most wet days in Castelo is December, with an average of 19.2 days with at least 0.04 inches of precipitation.

The drier season lasts 6.5 months, from April 3 to October 20. The month with the fewest wet days in Castelo is July, with an average of 2.3 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 Castelo is December, with an average of 19.2 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 65% on December 19.

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. Castelo experiences extreme seasonal variation in monthly rainfall.

Rain falls throughout the year in Castelo. The month with the most rain in Castelo is December, with an average rainfall of 8.0 inches.

The month with the least rain in Castelo is July, with an average rainfall of 0.4 inches.

The length of the day in Castelo varies over the course of the year. In 2024, the shortest day is June 20, with 10 hours, 53 minutes of daylight; the longest day is December 21, with 13 hours, 23 minutes of daylight.

The earliest sunrise is at 4:54 AM on November 26, and the latest sunrise is 1 hour, 27 minutes later at 6:21 AM on July 5. The earliest sunset is at 5:11 PM on June 5, and the latest sunset is 1 hour, 20 minutes later at 6:31 PM on January 16.

Daylight saving time (DST) is not observed in Castelo 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.

Castelo experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 8.5 months, from September 20 to June 6, during which time the comfort level is muggy, oppressive, or miserable at least 35% of the time. The month with the most muggy days in Castelo is March, with 29.7 days that are muggy or worse.

The month with the fewest muggy days in Castelo is July, with 5.4 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 Castelo experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 5.8 months, from August 2 to January 28, with average wind speeds of more than 8.2 miles per hour. The windiest month of the year in Castelo is September, with an average hourly wind speed of 9.5 miles per hour.

The calmer time of year lasts for 6.2 months, from January 28 to August 2. The calmest month of the year in Castelo is April, with an average hourly wind speed of 6.8 miles per hour.

The predominant average hourly wind direction in Castelo varies throughout the year.

The wind is most often from the east for 3.3 weeks, from April 6 to April 29, with a peak percentage of 36% on April 10. The wind is most often from the south for 2.1 weeks, from April 29 to May 14, with a peak percentage of 33% on May 1. The wind is most often from the north for 11 months, from May 14 to April 6, with a peak percentage of 66% on January 1.

Castelo 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 water temperature experiences some seasonal variation over the course of the year.

The time of year with warmer water lasts for 2.7 months, from February 12 to May 1, with an average temperature above 77°F. The month of the year in Castelo with the warmest water is March, with an average temperature of 78°F.

The time of year with cooler water lasts for 3.6 months, from July 1 to October 19, with an average temperature below 73°F. The month of the year in Castelo with the coolest water is August, with an average temperature of 72°F.

To characterize how pleasant the weather is in Castelo 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 Castelo for general outdoor tourist activities is from mid May to mid September, with a peak score in the last 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 times of year to visit Castelo for hot-weather activities are from early April to early July and from early July to mid October, with a peak score in the first 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 Castelo 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 2.0 months, from December 29 to February 28, with an average daily incident shortwave energy per square meter above 6.2 kWh. The brightest month of the year in Castelo is February, with an average of 6.6 kWh.

The darker period of the year lasts for 2.6 months, from May 8 to July 27, with an average daily incident shortwave energy per square meter below 4.7 kWh. The darkest month of the year in Castelo is June, with an average of 4.2 kWh.

For the purposes of this report, the geographical coordinates of Castelo are -20.604 deg latitude, -41.185 deg longitude, and 423 ft elevation.

The topography within 2 miles of Castelo contains large variations in elevation, with a maximum elevation change of 2,500 feet and an average elevation above sea level of 734 feet. Within 10 miles contains large variations in elevation (6,339 feet). Within 50 miles also contains extreme variations in elevation (9,403 feet).

The area within 2 miles of Castelo is covered by trees (66%) and cropland (23%), within 10 miles by trees (55%) and cropland (36%), and within 50 miles by trees (43%) and cropland (30%).