Climate for Station: Acajutla, Sonsonate, El Salvador

Acajutla's climate narrative is marked by a recent warming trend in highs and a cooling trend in lows over the past decade, contrasting with a long-term cooling in highs and warming in lows. The Precipitation Concentration Index indicates a more even distribution of rainfall, reflecting a shift in precipitation patterns.

Geographical and Climatic Context

Acajutla, located at 13.567°N, -89.833°W, sits on the Pacific coast of El Salvador. This region is classified under the Köppen climate system as a tropical savanna climate (Aw), characterised by distinct wet and dry seasons. The nearby Pacific Ocean moderates temperatures, while the coastal geography influences local weather patterns, contributing to the region's unique climatic profile.

Temperature Trends: A Tale of Two Timescales

Over the past decade, Acajutla has experienced a notable warming in high temperatures, with an increase of 2.95°C (5.32°F). This short-term trend suggests a significant regional warming, possibly influenced by broader global climate dynamics. Conversely, low temperatures have cooled by 1.24°C (2.23°F) during the same period, indicating a complex interplay of factors affecting nocturnal temperatures.

In contrast, the all-time trends tell a different story. Highs have cooled slightly by 0.17°C (0.31°F), while lows have warmed by 0.49°C (0.88°F). This long-term cooling in highs suggests a historical moderation of extreme heat events, while the warming of lows could be linked to changes in atmospheric conditions or urbanisation effects.

Precipitation Patterns: A More Even Distribution

The Precipitation Concentration Index (PCI) serves as a measure of how rainfall is distributed over time. Acajutla's PCI has decreased from a baseline of 17.5 to a current value of 14.8, indicating a more even distribution of precipitation events. This shift suggests that rainfall is becoming less concentrated in intense downpours and more evenly spread throughout the year, which could have implications for water management and agricultural practices.

Temperature Extremes: Record Highs and Lows

Acajutla's climate extremes are marked by a record high of 39.5°C (103.1°F) and a record low of 15.6°C (60.1°F). These figures highlight the potential for significant thermal variability in the region, which can impact both natural ecosystems and human activities.

Regional Climate Goals and Implications

El Salvador has been proactive in addressing climate change, aiming to enhance resilience and adapt to changing weather patterns. The trends observed in Acajutla, particularly the recent warming of highs and the more even distribution of rainfall, align with regional efforts to understand and mitigate climate impacts. These insights are crucial for informing policy and guiding sustainable development initiatives in the face of evolving climatic conditions.