December 2025 in Cardiff revealed a crime profile shaped by seasonal dynamics and the city's urban character. Violence and sexual offences dominated with 35.6% of all reported crimes, a pattern consistent with Cardiff's status as a major urban centre with a vibrant nightlife and high population density. Public order offences followed at 10.7%, significantly above the UK average, reflecting the pressures of managing large crowds in entertainment districts during the Christmas season. Shoplifting, at 10.0% of total crimes, also exceeded UK rates, likely driven by increased retail activity and the influx of holiday shoppers. These figures contrast with lower-than-average burglary rates, which may indicate the effectiveness of targeted policing in residential areas. The seasonal context of December—marked by Christmas shopping, dark evenings, and the temporary closure of some businesses—likely contributed to the mix of crime types observed. While the overall crime rate (8.0 per 1,000 residents) remained 14.3% above the UK average, the decline in anti-social behaviour and shoplifting compared to November suggests that festive closures and reduced public spaces may temporarily mitigate certain crime trends. The balance of violent and property crimes highlights Cardiff's dual role as a commercial hub and a densely populated city, where the interplay of economic activity, social interactions, and seasonal rhythms continues to shape the local crime profile.