Thornhill (ON) Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Thornhill, Ontario, Canada. These averages rely on historical data collected over 30 years, from 1990 to 2020. Now, let's break down all the details for a clearer picture.

Generally, Thornhill receives mid-range precipitation levels, with 911 mm (36 in) annually.

Monthly Precipitation Levels

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

Precipitation levels in Thornhill remain relatively steady throughout the year. April has the most rain, with 87 mm (3.4 in) over 11 days. In February, this drops slightly to 62 mm (2.4 in), making the city's climate fairly predictable.

April, the wettest month, has a maximum daytime temperature of 11°C (52°F). The city receives 180 hours of sunshine in this period. During the driest month February you can expect a temperature of 1°C (34°F). For more detailed insights into the city's temperatures, visit our Thornhill Temperature page.

Thornhill's average annual precipitation is 911 mm (36 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.

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

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

Mumbai, India, experiences a tropical monsoon climate with 1860 mm (73 in) of annual rainfall, with the majority of precipitation happening during the monsoon season from June to September.

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 Thornhill (ON):

• 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.

• 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 Thornhill (ON)'s weather, including sunshine hours, humidity levels, and temperature data, visit our Thornhill (ON) Climate page.