Pematangsiantar Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Pematangsiantar, Sumatra, Indonesia. This average is based on long-term data collected between 1990 and 2020. Let's explore the details to provide you with a complete overview.

Pematangsiantar has a notably wet climate with abundant precipitation, recording 3275 mm (129 in) of rainfall per year.

Monthly Precipitation Levels

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

The amount of precipitation varies moderately throughout the year. The wettest month, October, sees around 366 mm (14 in) of rainfall, perfect for those who enjoy a bit of rain now and then. The driest month, February, still receives a respectable 204 mm (8 in) of rainfall.

October, the wettest month, has a maximum daytime temperature of 30°C (86°F). During the driest month February you can expect a temperature of 30°C (86°F). For more detailed insights into the city's temperatures, visit our Pematangsiantar Temperature page.

Annual Rainfall in Indonesia: City Comparison

The map below shows the annual precipitation across Indonesia. You can also select the different months in case you are interested in a specific month.

Annual

Annual

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Legend

heavy rainfall

high

moderate

low

almost none

Heavy annual rainfall has been defined as more than 1000 mm (39 in) precipitation. High: 600 mm (24 in) to 1000 mm (39 in). Moderate: 250 mm (9.8 in) to 600 mm (24 in). Low: less than 250 mm (9.8 in).

Pematangsiantar vs World: Rainfall Compared

Pematangsiantar's average annual precipitation is 3275 mm (129 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.

Beijing, China, receives 560 mm (22 in) of annual precipitation, concentrated in the summer months.

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.

How is Precipitation Measured?

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.

Rainy Seasons: Many parts of the world have well-defined wet seasons where precipitation is distinctly higher. These are normally accompanied by lush vegetation and temperature patterns.

Dry Seasons: In areas where the climate is either desert or Mediterranean, the amount of precipitation is drastically reduced, leading to a shortage of water and arid conditions.

Interesting weather facts

"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 Pematangsiantar's weather, including sunshine hours, humidity levels, and temperature data, visit our Pematangsiantar Climate page.

Current rainfall in Pematangsiantar

10-Day Forecast