Rio das Ostras Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Rio das Ostras, Rio de Janeiro State, Brazil. The numbers reflect climate data gathered over a 30-year period, from 1990 to 2020. Let's explore the details to provide you with a complete overview.

Rio das Ostras is known for its substantial rainfall, with annual precipitation reaching 1341 mm (53 in). While the overall climate is wet, there are notable seasonal patterns that create interesting contrasts, as demonstrated in our graph below.

Monthly Precipitation Levels

The average number of days each month with precipitation (> 0.2 mm (0.01 in))

The climate in Rio das Ostras shows significant variation throughout the year. Expect 205 mm (8.1 in) of precipitation during the wettest month December, distributed over 21 rainy days.

In contrast, July offers drier and sunnier days, with around 36 mm (1.4 in) of rainfall over 11 rainy days.

December, the wettest month, has a maximum daytime temperature of 30°C (86°F). During the driest month July you can expect a temperature of 26°C (79°F). For more detailed insights into the city's temperatures, visit our Rio das Ostras Temperature page.

Rio das Ostras's average annual precipitation is 1341 mm (53 in). Let's compare this to some popular worldwide tourist destinations:

Chicago, USA, sees an annual precipitation of 1062 mm (42 in), with rain and snow contributing to its humid climate.

In Shanghai, China, the annual average precipitation is 1347 mm (53 in), with a humid subtropical climate.

In Tokyo, Japan, the average annual precipitation is 1528 mm (60 in), with significant summer rains due to typhoon season.

Bangkok, Thailand, experiences a tropical monsoon climate with 1668 mm (66 in) of annual rainfall, with the heaviest precipitation occurring during September and October.

Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.

Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.

The proximity of a location to a large body of water can significantly affect its rainfall patterns:

• Ocean Influence: Coastal regions typically receive more rainfall due to the presence of moisture-laden winds from the ocean. These regions tend to have more humid climates and experience more frequent precipitation, especially in winter.
• Continental Climates: Areas further from the sea, such as inland or continental regions, experience less frequent rainfall and more extreme seasonal variations in precipitation.

• The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
• Approximately 70% of lightning bolts strike land rather than oceans.
• A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.

For more detailed information about Rio das Ostras's weather, including sunshine hours, humidity levels, and temperature data, visit our Rio das Ostras Climate page.