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Luxembourg is a region with a mild climate. Temperatures during the day are in the range from 4 °C (39 °F) in January to 23 °C (74 °F) in July. Temperatures during the night go from -1 °C (31 °F) in January to 13 °C (55 °F) in July. The least rainy month in Luxembourg is September with its 10 days of rain, the rainiest month is December, when it rains 14 days.
The best time to visit Luxembourg is between July and August. In this period day temperatures range from 23 °C (73 °F) to 23 °C (74 °F), night temperatures from 13 °C (55 °F) to 13 °C (55 °F) and you can expect on average 11 days of rain per month and 7 of sunshine on average per day.
Yes, it is likely to be freezing at night in Luxembourg in the months of December - March.
The highest temperatures during the night in Luxembourg could be expected between June and August. During this time the night temperatures are between 11 °C (52 °F) - 13 °C (55 °F).
The hottest month in Luxembourg is July with a temperature of 23 °C (74 °F). The period with the highest daytime temperatures is in Luxembourg during June - August. The temperatures range at this time between 21 °C (70 °F) - 23 °C (74 °F).
The period, which is the sunniest in Luxembourg, is in the months of May - August, when there is an average of 7 sun hours per day.
Luxembourg belongs to destinations with lower humidity. It ranges from 71 % to 90 %. The most humid months are December - January and the least humid are April - June.
Luxembourg is a destination with rather light or moderate winds.
The least cloudy months in Luxembourg are June - September, when the cloud cover is on average only 56 %.