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Here in Christchurch, despite sizeable variations in seasonal day lengths and average temperatures, it's plausible to get a mostly sunny day with a high of 18C in winter or in summer (from foehn winds and sea breezes, respectively).
However, I've noticed that in days like the former, it's still typically necessary to use heating in the evening. In the latter, however, it typically isn't. I presume the main reason why is that in the former case, the sun is down by 5:30pm, while in the latter case it's stronger throughout the day and is still radiating heat to the house until it sets at 9:00pm. A secondary reason could be that the house likely started at a higher baseline temperature in the summer, although I'm not sure how strong an effect this is.
What's it like for you? And how does it vary between places with very different climates? For instance, I assume there are a lot of houses in cold climates that are built/insulated to retain heat that can get quite warm on cool but sunny days. Those same temperatures in a warm-weather city (with probably fewer daylight hours) would likely feel cold inside typical houses of the area.