Glennallen (AK) Monthly Rainfall & Precipitation

This page shows both the average monthly rainfall and the number of rainy days in Glennallen, Alaska, United States of America. The numbers reflect climate data gathered over a 30-year period, from 1990 to 2020. Let's now guide you through the details for a complete overview.

Glennallen tends toward drier weather patterns, receiving approximately 495 mm (19 in) of rain/snow per year. The city experiences a distinct dry season during certain months, contributing to seasonal contrasts shown in the charts below.

Monthly Precipitation Levels

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

Glennallen can be quite wet during September, receiving approximately 69 mm (2.7 in) of precipitation over 11 rainy days.

In contrast April, experiences much drier conditions, with 15 mm (0.6 in) of snow/rainfall, spread across 4 snowy/rainy days.

September, the wettest month, has a maximum daytime temperature of 12°C (54°F). During the driest month April you can expect a temperature of 6°C (43°F). For more detailed insights into the city's temperatures, visit our Glennallen Temperature page.

Glennallen's average annual precipitation is 495 mm (19 in). Let's compare this to some popular worldwide tourist destinations:

Chicago, USA, sees an annual precipitation of 1062 mm (42 in), with rain and snow contributing to its humid climate.

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

Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.

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.

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