Climate Chart of Lille, France

Climate overview

Temperature

The coolest monthly mean is January at 4.3 °C, while the warmest is July at 18.9 °C. These are monthly averages, not daytime highs, so individual days may fall outside the picture they provide; use them as a broad guide to the changing background temperatures when choosing clothing. Across the calendar-month means, the unweighted mean temperature is 11.3 °C. It summarizes the monthly averages without accounting for the differing number of days in each month, and does not describe the temperature on any particular date.

Rain

Mean daily rainfall is lowest in April at 1.26 mm/day, making it a conditional option for visitors who prioritize lower average rainfall. The highest monthly mean is in November at 2.48 mm/day; visitors then may wish to prepare for wet weather. These are daily mean amounts, not monthly totals, and they do not show how often rain falls or guarantee dry or wet days. The unweighted mean of the calendar-month daily rainfall means is 2.00 mm/day. This offers a broad summary, but cannot indicate the timing, duration or frequency of rainfall on a particular visit.

Sunshine

Mean daily sunshine reaches its highest level in June at 11.02 hours/day and its lowest in December at 3.17 hours/day. The contrast can help with planning outdoor sightseeing, but sunshine duration is not the same as day length and does not guarantee clear skies throughout a day. The unweighted mean across the calendar-month sunshine averages is 7.43 hours/day per day. Treat it as a summary of monthly daily means, not a prediction of the sunshine available on specific dates.

Snow

The highest monthly mean daily snowfall is in January at 1.74 mm/day, and the unweighted mean across calendar months is 0.33 mm/day. These snowfall averages describe amounts, not the number of snowy days, snow depth or snow cover, so they cannot establish whether snow will be present during a visit.