San Alfonso Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in San Alfonso, Santiago Metropolitan Region, Chile. These averages rely on historical data collected over 30 years, from 1990 to 2020. Now, let's explore all the details to give you a full picture.

San Alfonso experiences significant rain/snowfall throughout the year, averaging 1096 mm (43 in) of precipitation annually. However, this abundant rainfall is not evenly distributed, with a distinct dry season during certain months. You can clearly see this in our monthly precipitation graphs below.

Monthly Precipitation Levels

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

Significant seasonal changes in precipitation occur throughout the year. During the wettest month, June receives substantial snow/rainfall, averaging 211 mm (8.3 in) of precipitation, recorded across 4 snowy/rainy days.

In contrast, the driest month, March brings less rainfall, with 25 mm (1 in) over 7 rainy days.

June, the wettest month, has a maximum daytime temperature of 3°C (37°F). The city receives 120 hours of sunshine in this period. During the driest month March you can expect a temperature of 19°C (66°F). For more detailed insights into the city's temperatures, visit our San Alfonso Temperature page.

San Alfonso's average annual precipitation is 1096 mm (43 in). Let's compare this to some popular worldwide tourist destinations:

The climate in San Francisco, USA, is influenced by coastal weather, with 469 mm (18 in) of rainfall mostly during the winter months.

Osaka, Japan, experiences 1507 mm (59 in) of rainfall annually, spread across the year with wetter summers.

In Brisbane, Australia, the annual precipitation is 979 mm (39 in), making it wetter than Sydney.

Ho Chi Minh City, Vietnam, receives 1955 mm (77 in) of annual rainfall, with a pronounced wet season from May to November, typical of its tropical monsoon climate.

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.

Climate change is affecting precipitation patterns worldwide, including San Alfonso:

• 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.

• "Ginger" was the longest-lasting Atlantic tropical storm, which spun around the open ocean for 28 days in 1971.
• The world's largest snowflake was recorded in the Guinness Book of Records, at 38 cm (15 inches) wide and 20 cm (7.9 inches) thick. The snowflake fell at Fort Keogh, Montana, USA, on 28 January 1887.
• The greatest snowfall recorded was on Mt. Rainier, Washington State, USA, over 31.5 meters (103 feet) fell during the winter of 1972.

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