Month — Rainy Season

A calendar month during which total precipitation exceeds 50% of the potential evapotranspiration, occurs within a block of ≥2 consecutive such months, and corresponds to the climatological peak of the local hydrologic year.

Rainy months often see an increase in waterborne or mosquito-borne illnesses; keep repellent handy. Pros and Cons of Traveling During Rainy Months

To operationalize these definitions, we examine two distinct regions. rainy season month

Because the Earth is tilted and rotates, the rainy season shifts depending on the hemisphere and local geography.

The rainy season is not binary. The (e.g., June in Delhi) and cessation month (September) are "transitional rainy months."

Here is a guide to the rainy season months by region, along with tips on how to navigate them. A calendar month during which total precipitation exceeds

The rainy season, often referred to as the , is a defining period of the year in many parts of the world where the majority of annual precipitation occurs. This season is characterized by a seasonal shift in wind patterns that brings moisture-laden air from the oceans over land, resulting in persistent and often intense rainfall. Timing and Duration

Flooded roads and canceled flights are common.

The rainy season is a transformative period that dictates the rhythm of life, agriculture, and travel across the globe. While many associate "rainy months" with gray skies, these periods are essential for replenishing the Earth's water supply and sustaining biodiversity. What Defines a Rainy Season? Because the Earth is tilted and rotates, the

Regions like Costa Rica, Panama, and the Amazon Basin experience a prolonged wet season. May to November.

The concept of a “rainy season month” is fundamental to agriculture, water resource management, and disaster preparedness in tropical and subtropical regions. While often discussed qualitatively, a rigorous definition requires quantitative meteorological thresholds. This paper examines the criteria used to define a rainy season month, focusing on precipitation totals, the onset and cessation phases, and spatial variability. Using case studies from the Indian Summer Monsoon and the West African Monsoon, this paper argues that a rainy season month is best defined as any calendar month where average precipitation exceeds a region-specific threshold (typically 50–100 mm) and potential evapotranspiration (PET) is exceeded by rainfall. The paper concludes by discussing the impacts of climate change on the shifting structure of the rainy season.

Recent data (1950–2025) indicates that the traditional "rainy season month" is shifting: