Alpharetta (GA) Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Alpharetta, Georgia, United States of America. The figures are based on a 30-year period (1990–2020) to provide a reliable average. Let's now guide you through the details for a complete overview.

Alpharetta has a notably wet climate with abundant precipitation, recording 1245 mm (49 in) of rain/snowfall per year.

Monthly Precipitation Levels

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

Alpharetta experiences moderate seasonal variation in rainfall, with monthly averages ranging from 144 mm (5.7 in) in December, the wettest month, and 78 mm (3.1 in) in June, the driest month.

December, the wettest month, has a maximum daytime temperature of 13°C (55°F). The city receives 164 hours of sunshine in this period. During the driest month June you can expect a temperature of 31°C (88°F). For more detailed insights into the city's temperatures, visit our Alpharetta Temperature page.

Alpharetta's average annual precipitation is 1245 mm (49 in). Let's compare this to some popular worldwide tourist destinations:

In Lisbon, Portugal, the average annual precipitation is 774 mm (30 in), characterized by wet winters and dry summers typical of the Mediterranean climate.

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

Perth, Australia, receives 565 mm (22 in) of rainfall annually, mostly during the winter months.

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 Alpharetta (GA):

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