Drink-driving is often linked with Christmas parties and New Year celebrations, but new analysis of British road-safety data suggests the bigger seasonal risk may actually come during summer.

Looking at figures from 2014 to 2024, August recorded the highest average number of drink-drive casualties and collisions of any month in Great Britain. It averaged 721 casualties from 485 collisions per year, narrowly ahead of July, with 704 casualties and 474 collisions.

The festive season, often associated with higher drink-driving risk, averaged 663 casualties from 459 collisions.

Summer Consistently Stands Out

Across the 11-year period, June to August produced around 16% more drink-drive casualties than the three winter months. The number of drink-drive collisions was also about 16% higher during summer.

The latest full-year figures suggest the pattern has continued. In 2024, June recorded around 650 casualties and 440 collisions. Across the three summer months, there were approximately 1,810 casualties and 1,220 collisions, compared with around 1,570 casualties and 1,060 collisions during winter.

The figures challenge a familiar assumption: warmer months can bring a greater road-safety risk than the period usually associated with festive celebrations.

Why Warm Weather Can Increase Risk

Longer evenings, holidays, festivals, outdoor gatherings and barbecues all create more occasions when people may drink away from home and later consider driving.

Hot weather can add another complication. Dehydration and poor sleep may already reduce concentration and reaction speed, making driving after drinking even more dangerous.

RAC road-safety specialists warn that drivers should not assume summer drinking is less risky simply because public attention often focuses on the festive season.

The safest approach is straightforward: if you have been drinking, arrange another way home rather than trying to judge whether you are safe to drive.

Drinks consumed late at night can also continue to affect the body the following morning, so an early journey after a long evening may still carry a risk.

Repeat Offending Remains a Concern

The figures have renewed calls for stronger measures against repeat drink-driving.

One proposal is wider use of ignition interlocks, sometimes called alcolocks. These devices require a driver to provide a breath sample before the vehicle can start. If the reading exceeds a set threshold, the engine remains disabled.

Supporters argue that court-ordered interlocks could be particularly useful for people repeatedly convicted of drink-driving.

The aim is not simply to punish offenders, but to physically prevent a vehicle from being started when the driver is not in a suitable condition.

This type of technology is already used in several countries and is often discussed as a possible tool for reducing repeat offences.

Planning Ahead Matters

Summer social events often involve travelling farther from home, which can make poor decisions more likely if transport has not been arranged in advance.

Before attending a festival, barbecue or evening event, decide how you will return. Public transport, taxis, designated drivers or staying overnight can all remove the temptation to drive.

It is also important not to rely on coffee, food, a cold shower or a short period of rest as a way to become fit to drive more quickly. Time is what allows the body to process what has been consumed.

If there is any doubt, waiting longer is safer than trying to estimate your condition.

Summer Deserves More Attention

The seasonal figures show that drink-driving should not be treated mainly as a winter problem.

Summer brings its own combination of social events, longer evenings and increased travel, and the statistics suggest these conditions can translate into more collisions and casualties.

The simplest rule remains the most reliable: if you are unsure whether drinking could still affect your driving, do not get behind the wheel.

Greater awareness during warmer months, combined with enforcement and stronger measures against repeat offenders, could help reduce a risk that is still too often underestimated.