The daylight hours (hours between sunrise and sunset) vary a lot between the winter and summer months. People may expect to see the midnight sun during the summer, because they are in Scandinavia. But this is not true for Örebro, because you are not far enough north in the country.
In December you will only have 6 hours to enjoy the day. The sun will get up around 8:30 in the morning but is already setting again before 3 o'clock in the afternoon and that doesn't leave you that much time to do some sightseeing.
In June it is a totally different world, and I love this time of year. Around the longest day (21 June) you will experience the long looooong days! There are 18,5 hours of daylight during those days, the day seems to last forever. The only disadvantage is when you are a light sleeper, as the night only last 5,5 hours.
Average hours of daylight:
There is no special rainy season
Avg. Temp. in Spring: max.: 4 – 16°C ( 39 - 60°F ); min: -4 - 5°C ( 25 - 41°F )
Avg. Temp. in Summer: max.: 19 – 21°C ( 66 - 70°F ); min: 9 - 11°C ( 49 - 51°F )
Avg. Temp. in Autumn: max.: 4 – 16°C ( 39 - 60°F); min: 0 - 8°C ( 32 – 47°F )
Avg. Temp. in Winter: max.: 0 – 1°C ( 32 - 34°F); min: -4 - -3°C ( 25 - 27°F )