Kaduna, a major city in northern Nigeria, typically experiences its coolest month in December, marking the peak of the dry season and the influence of the Harmattan winds. Historical averages show daytime highs around 32–33°C (90–91°F) and nighttime lows dipping to about 13–18°C (55–64°F), with low humidity, dusty conditions, and clear skies providing some relief from the intense heat of earlier months.

However, December 2025 felt noticeably different for many residents. Temperatures were warmer than the long-term norms, with reports of hotter afternoons, less pronounced cool nights, and delayed or weakened Harmattan effects. Data from weather stations, including Kaduna Airport and regional SYNOP observations, indicate average monthly temperatures around 31.5°C (highs reaching up to 33–36°C in some periods), exceeding typical December figures by several degrees in parts of the region.

Key Factors Behind the Unusual Heat

1. Global Climate Context – A Record-Breaking Warm Year 2025 ranked as the third-warmest year on record globally, according to multiple authoritative sources including NOAA, Copernicus Climate Change Service (C3S), Berkeley Earth, and the World Meteorological Organization (WMO). Global surface temperatures were about 1.44°C above the pre-industrial (1850–1900) baseline, with December 2025 itself the fifth-warmest December worldwide (1.05°C above the 20th-century average per NOAA; 0.49°C above 1991–2020 per Copernicus). This persistent global warming, driven primarily by human greenhouse gas emissions, amplifies regional extremes—even in months that are seasonally cooler. The year followed back-to-back record warmth in 2023 and 2024, pushing baseline temperatures higher and making anomalies more frequent.
2. Weakened or Delayed Harmattan The Harmattan—a dry, dusty northeast trade wind from the Sahara—usually brings cooler mornings, lower humidity, and hazy conditions to northern Nigeria in December. In 2025–2026, however, the Harmattan was significantly delayed or suppressed in many areas, including Kaduna State. Reports from climate observers and NiMet (Nigerian Meteorological Agency) highlighted unusual patterns: persistent higher humidity, reduced dust haze, and warmer-than-expected conditions across the Sahel and northern Nigeria. Extreme positive temperature anomalies of +8°C to +12°C were noted over parts of the Sahara and Sahel in late 2025, disrupting the typical cooling flow southward.
3. Regional Climate Anomalies and Local Influences Northern Nigeria, including Kaduna, saw deviations from NiMet’s December 2025 outlook, which predicted hot days (33–38°C) but with classic Harmattan dominance (cool nights 13–18°C, low visibility from dust). Instead, warmer nights and sustained daytime heat prevailed in some locations, linked to broader West African weather shifts. Climate change has been intensifying heatwaves and altering seasonal patterns in Nigeria, with studies noting rising average temperatures (up ~1.2°C in recent decades) and more frequent extremes. Urban factors in Kaduna—such as concrete infrastructure, reduced vegetation, and heat island effects—likely exacerbated local sensations of heat, even if station data showed moderate monthly averages.
4. Broader West African Weather Shifts The 2025–2026 dry season featured anomalies like occasional unseasonal rainfall in parts of Nigeria (attributed to temporary weather systems) and suppressed Harmattan across West Africa. These changes fit into long-term trends of a shortening or weakening Harmattan due to climate change, leading to hotter, more humid conditions during what should be the “cool” dry season.

Implications for Kaduna Residents

The warmer December contributed to increased heat discomfort, higher energy demands for cooling, potential health risks (e.g., heat stress, dehydration), and challenges for agriculture and water resources during the dry period. It serves as a reminder of how global warming interacts with local weather systems to produce noticeable changes in everyday life.

Experts from groups like the Climate Research Group at Kaduna State University emphasize the need for enhanced monitoring, early warnings, and adaptation strategies—such as urban greening, improved building designs, and community heat action plans—to build resilience against future extremes.

As Nigeria continues to experience evolving climate patterns, events like December 2025’s unusual warmth underscore the urgency of both global emission reductions and local preparedness.