Your question isn’t as straightforward as it seems because many animals aren’t strictly “nocturnal”, different populations of them may tend to be active at different times for different reasons other than just night/day (such as local human activity, weather/temperature, availability of food during a particular time of year).

Here is a 2-year study of several different mammals in Japan based on camera traps, showing that some animals shift their activity patterns seasonally: Seasonal and Diel Activity Patterns of Eight Sympatric Mammals in Northern Japan Revealed by an Intensive Camera-Trap Survey

Interestingly, instead of being more active at night when winter nights are longer, some crepuscular (normally active at dawn and dusk) animals such as deer became more diurnal in winter— the authors hypothesize that it’s because winter nights are cold so it’s better to be active when the sun is up.

For wolves specifically, since you mentioned them, they are one of those species that is highly adaptable and not always strictly nocturnal or crepuscular. There is some good discussion of that in this article: Daily Patterns and Duration of Wolf Activity in the Białowieza Forest, Poland

> This causes dissimilarities in activity patterns of wolves from different study sites: wolves were nocturnal in Italy (Ciucci et al. 1997); nocturnal with a tendency to bimodal activity in Spain (Vilà et al. 1995); active throughout day and night in Ontario, Canada (Kolenosky and Johnston 1967); and most active from 2200 to 0600 h in summer and from 0700 to 1600 h in winter in Alaska (Fancy and Ballard 1995).

The sources are clickable in the linked article if you want to learn more!

These authors found their particular wolves remained basically crepuscular year round, and believe that weather and prey availability/behavior affect their activity patterns more than human activity nearby or other factors, but they specifically call out that in other parts of the world, different circumstances apply and you end up with different results.

Also from the same paper:

> If wolves adapted their behavior to avoid direct contact with humans, they might have become less active during the day. Indeed, wolves studied in mountainous agricultural regions of Spain and Italy with human densities of 20–30 inhabitants/km2 hardly moved during daylight (Ciucci et al. 1997; Vilà et al. 1995). In Alaska, where human density is low, wolves moved during 50% (Peterson et al. 1984) of the daylight. In forests of Minnesota, where human density in the wolf range was 1.5 inhabitants/km2 (Mladenoff et al. 1995), wolves moved during 28% of the daylight in winter (Mech 1992). In the Białowieża Forest, persecution does not seem to have caused wolves to reduce their activity and movement in daylight, perhaps because our study area is mostly covered by forest. In Italy and Spain, where <40% of the area in the wolves' home ranges was forested (Ciucci et al. 1997; Vilà et al. 1995), there may not have been enough cover for daylight movement. Human activity therefore does not seem to significantly influence temporal activity patterns of wolves in regions where they have the opportunity to avoid direct contact with humans.

So you can see there’s not just one simple answer to your question!