Boa Vista Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Boa Vista, Roraima, Brazil. This average is based on long-term data collected between 1990 and 2020. Now, let's explore all the details to give you a full picture.

Boa Vista has a relatively rainy climate with high precipitation levels, averaging 1847 mm (73 in) of rainfall annually. Despite the high annual total, it does experience a distinct dry and rainy season during certain months. Examine our detailed charts below to understand these seasonal patterns.

Monthly Precipitation Levels

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

Boa Vista can be quite wet during May, receiving approximately 366 mm (14 in) of precipitation over 23 rainy days.

In contrast January, experiences much drier conditions, with 38 mm (1.5 in) of rainfall, spread across 10 rainy days.

May, the wettest month, has a maximum daytime temperature of 31°C (88°F). The city receives 139 hours of sunshine in this period. During the driest month January you can expect a temperature of 34°C (93°F). For more detailed insights into the city's temperatures, visit our Boa Vista Temperature page.

Boa Vista's average annual precipitation is 1847 mm (73 in). Let's compare this to some popular worldwide tourist destinations:

In Barcelona, Spain, the average annual precipitation is 644 mm (25 in), evenly distributed across the year with no extreme wet or dry seasons.

Meanwhile, Buenos Aires, Argentina, enjoys a humid subtropical climate with 1000 mm (39 in) of annual rainfall, mostly in the summer.

Adelaide, Australia, enjoys 511 mm (20 in) of annual precipitation, with dry summers and wet winters.

Singapore, situated near the equator, gets 2581 mm (102 in) of rainfall annually, with no distinct dry season and consistent monthly precipitation.

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.

Precipitation has a very strong role in determining the local climate and ecosystem:

• Changing Rainfall Patterns: Global warming causes drastic changes in the patterns of rainfall. Some areas have been experiencing increased frequency and intensity of rainfall, while other areas experience longer dry spells or even droughts.
• Local Impacts: Many regions are experiencing heavier rainfall in the winter months and drier, hotter summers. This affects agriculture, water resources, and ecosystems.

• Mawsynram in India is noted as being the wettest place on earth, with over 11 meters (36 feet) of rain falling every year.
• In contrast, Antofagasta in Chile is among the driest places on the planet, getting less than 0.1mm (0.004 inches) per year, with some years recording virtually no rainfall.
• Nearly 1,650 thunderstorm cells are estimated over the planet at any given time.

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