Climate for Station: Ouarzazate, Draa-Tafilalet, Morocco

Ouarzazate, a city nestled in the heart of Morocco, is experiencing a notable warming trend, with both high and low temperatures rising over the past decade. This increase in temperature is accompanied by a significant concentration of precipitation events, indicating a shift towards more intense weather patterns.

Desert Climate Dynamics

Ouarzazate, located at 30.93°N, -6.9°W, is classified under the Köppen climate classification as a hot desert climate (BWh). This classification is characterised by extremely low annual precipitation and high temperature variability. The city's geographical setting, sheltered by the Atlas Mountains, contributes to its arid conditions. The mountains act as a barrier, limiting moisture-laden winds and enhancing the desert climate's intensity.

Temperature Trends: A Warming Narrative

Over the past decade, Ouarzazate has experienced a warming trend, with average high temperatures increasing by 1.07°C (1.93°F) and lows by 1.11°C (2.00°F). This recent trend is more pronounced than the all-time trends, which show a rise of 0.45°C (0.81°F) for highs and 0.34°C (0.61°F) for lows. The divergence between the 10-year and all-time trends suggests an acceleration in warming, a critical insight for regional climate strategies.

Precipitation Patterns: Intensifying Events

The Precipitation Concentration Index (PCI) for Ouarzazate has risen from a baseline of 18.2 to a current value of 21.0, indicating a significant increase in the concentration of precipitation events. This shift means that rainfall is occurring less frequently but in more intense bursts, a pattern that can lead to flash floods and erosion, challenging local infrastructure and agriculture.

Record Extremes: The Limits of Heat and Cold

Ouarzazate's climate is marked by extreme temperatures, with historical records showing a maximum of 43.6°C (110.5°F) and a minimum of -7.0°C (19.4°F). These extremes highlight the city's vulnerability to both scorching heat and unexpected cold snaps, necessitating adaptive measures for both residents and the local economy.

Regional Implications and Climate Goals

As Morocco strives to meet its climate goals, including reducing greenhouse gas emissions and enhancing resilience to climate impacts, the data from Ouarzazate serves as a crucial indicator of broader regional trends. The warming and intensified precipitation patterns underscore the need for adaptive strategies in water management and urban planning to mitigate the impacts of climate change on this desert city.