Online-shopping statistics can move sharply from one month or quarter to another even when the underlying market has not changed dramatically. Seasonal buying patterns, holidays and the mix of spending all matter.
ONS data illustrates the point. The online share of UK consumer card spending was 46.4% in December 2024 and 54.0% in January 2025. The ONS retail internet-sales ratio was 26.3% in 2025 Q2 and 30.0% in Q4.
January and December can tell different stories
The 7.6 percentage-point difference between December 2024 and January 2025 in the card-spend series is a reminder that adjacent months can be shaped by very different purchasing patterns.
It would be unsafe to describe that change as a structural shift in online behaviour without more evidence.
Quarterly retail data also shows seasonal movement
Retail internet sales reached 30.0% of total retail sales in 2025 Q4, compared with 26.3% in Q2. Holiday-season purchasing is one plausible context, but the statistic itself only shows the measured share.
The series is non-seasonally adjusted, which makes timing especially important.
Single-month comparisons are fragile
Comparing one month with the month immediately before can exaggerate short-term movement. This is particularly risky around Christmas, January sales and other major retail events.
For a more stable view, year-on-year or rolling comparisons are often more informative than adjacent-month headlines.
Different datasets have different seasonal behaviour
Card-spending data and retail internet-sales data do not measure the same thing. Their seasonal patterns can therefore differ.
A consumer-tech article should not assume that a seasonal jump in card-online share means the same percentage change occurred in online retail sales.
Date labels are part of the statistic
The safest way to present online-shopping data is to keep the month or quarter attached to the figure and explain whether the series is seasonally adjusted.
That prevents a seasonal snapshot from being mistaken for a permanent shift in consumer behaviour.
Sources: Office for National Statistics consumer-card spending and Retail Sales Index internet-sales data. The retail internet-sales series cited here is non-seasonally adjusted.