When to go on vacation
You are wondering when is the best time to go on vacation this year? If you have full freedom of choice, you really are very lucky. As a rule, people in many workplaces, supposedly they can choose when they want to go on holiday, but with a rather unofficial selection, on which dates it will be unwelcome. Hence, they do not have too many available dates to choose from.
But suppose, that you are free to choose. It will be obvious, that you will pay the most attention to the weather first, more specifically the long-term weather forecast. It may turn out to be, that not every month is suitable for lounging by the sea, of course given, that you want to spend your vacation in Poland. The best months for the seaside are July and August, and in the mountains practically all year round, maybe except March, April, and October. Because in these months, there is not much attraction like snow, or the routes not endangered by avalanches.
Again considering going abroad, in fact, the holiday should be tailored to a specific country. Of course, in tropical regions, you have to take into account the rainy and dry season. In Asia with monsoons and much safer. Therefore, it is best to establish a specific destination first, and the date will be much more convenient to arrange.