Climate and monthly weather forecastChartres, France
Climate and monthly weather forecast
The climate of Chartres
Located in the north-central part of France, Chartres enjoys a marine west coast climate with warm summers, as described by the Köppen climate classification system. Classified as Cfb, this climate type is characterized by mild, more or less evenly distributed rainfall throughout the year, and moderate temperature variations between seasons.The city experiences a fairly constant relative humidity, hovering around the 80% mark, with minor fluctuations throughout the year. Its temperatures range from an average low of 1.3°C (34.3°F) in January and February to a high of 24.1°C (75.4°F) in August. Rainfall measures between 16mm (0.63") in September and 49mm (1.93") in June, whereas the number of rainy days fluctuates from approximately 10 to 17 per month. Although it is not a typical feature of Cfb climates, Chartres does see snowfall in the colder months, with the most significant amounts falling in January and December.
Chartres also offers a moderate amount of sunshine all year round, with monthly averages varying from 3.8 hours a day in January to 8.9 hours in July and August. The corresponding ultraviolet (UV) index fluctuates from 2 in the darker months to 5 at the height of summer. Despite its westerly position, the city does not suffer from high wind speeds, as evidenced by an average monthly wind speed ranging from 11.1km/h (6.9mph) in August to 16.9km/h (10.5mph) in December.
The best time to visit Chartres
Considering the weather patterns in Chartres, France, the optimal time for a visit would likely be between May and September. This period promises more mild temperatures, with average highs ranging from 17.3°C (63.1°F) to 24.1°C (75.4°F). The amount of sunshine during this time also increases significantly, with average daily sunshine hours ranging from 7.7 to 8.9. In addition, the UV index reaches its peak of 5 between June and August, adding to the allure of outdoor activities. Despite these warmer temperatures, rainfall remains moderate, so visitors will not often be deterred by heavy showers.The worst time to visit Chartres
Chartres becomes less inviting to visitors from November through February. During this time, temperatures can drop to an average low of just 1.3°C (34.3°F), particularly in January and February. Days get shorter as well, with daylight hours ranging from 8.4 to 9.2 per day and average daily sunshine hours dropping to as low as 3.8 in January. Additionally, despite lower temperatures, the risk of rainfall remains high, with November recording 36mm (1.42") and February recording 24mm (0.94"). It's worth noting that the risk of snowfall also increases, especially in December and January.Spring weather in Chartres
Chartres experiences a gradual warming trend in the spring, with average high temperatures increasing from 11.4°C (52.5°F) in March to 15.1°C (59.2°F) in April and 17.3°C (63.1°F) in May. Similarly, average lows rise from 3.4°C (38.1°F) in March to 5.5°C (41.9°F) in April and 7.7°C (45.9°F) in May. Rainfall shows a slightly increasing trend throughout the spring, ranging from 28mm (1.1") in March to 45mm (1.77") in May. The length of daylight also experiences a substantial increase, with the city seeing between 11.9 and 15.3 hours of daylight per day.Summer weather in Chartres
Chartres enjoys warm, mild summers, with average high temperatures reaching 20.8°C (69.4°F) in June, 23.6°C (74.5°F) in July, and 24.1°C (75.4°F) in August. Minimum temperatures also rise comfortably, with lows of 11.3°C (52.3°F) in June escalating to 13.4°C (56.1°F) in July and 14.3°C (57.7°F) in August. While rainfall is at its height in June at 49mm (1.93"), it diminishes in the following months to 37mm (1.46") in July and 34mm (1.34") in August. Daylight hours peak in June and July at 16 and 15.6 hours per day respectively, providing long, sunny days.Autumn weather in Chartres
The climate in Chartres begins to cool down during the autumn months. The city witnesses average high temperatures declining from 20.7°C (69.3°F) in September to 16°C (60.8°F) in October, and further to 10.2°C (50.4°F) in November. The rainfall, however, increases slightly from 16mm (0.63") in September to 28mm (1.1") in October and 36mm (1.42") in November. Daylight hours also drastically reduce during these months, dwindling from 12.6 hours per day in September to around 9.2 hours by November.Winter weather in Chartres
Winter in Chartres is typically cold, with average high temperatures decreasing from 7.2°C (45°F) in December to just 6°C (42.8°F) in January and then making a slight recovery to 7.3°C (45.1°F) in February. The average lows follow a similar trend, with temperatures falling to 2.7°C (36.9°F) in December and to the year's low of 1.3°C (34.3°F) in January before rebounding slightly to 1.3°C (34.3°F) in February. Chartres sees a moderate amount of snowfall, mostly in January and February. The hours of daylight are at their lowest during these months, averaging between 8.4 to 8.8 hours per day.Weather in January
January in Chartres, France, sees some of the chillest temperatures of the year, reaching a high of only 6°C (42.8°F) and dropping to a chilly 1.3°C (34.3°F) at night. The city's weather pattern in this period stands out with 22 snowfall days and a significant drop in temperature from December. Weather in January »Weather in February
Rising from the January chill, Chartres in February starts to experience a slight increase in temperature, with average high and low temperatures of 7.3°C (45.1°F) and 1.3°C (34.3°F) respectively. The amount of snowfall diminishes noticeably from January to February, indicating the gradual end of winter. Weather in February »Weather in March
March in Chartres appreciates a significant warming trend, marking the beginning of spring in the city. The average high temperature jumps to 11.4°C (52.5°F), while nightfalls cool down to an average low of 3.4°C (38.1°F). This month sees a dramatic decline in snowfall, dropping from 18mm (0.71") in February to just 1mm (0.04"). Weather in March »Weather in April
April marks the midpoint of spring and temperatures in Chartres continue to climb, with average highs of 15.1°C (59.2°F) and lows of 5.5°C (41.9°F). A relative decrease in snowfall is noted, as the months change from March to April, signifying a clear transition into the warmer months. Weather in April »Weather in May
Chartres' weather in May brings the onset of summer with temperatures peaking at 17.3°C (63.1°F) and only descending as low as 7.7°C (45.9°F). The substantial increase in rainfall from 26mm (1.02") in April to 45mm (1.77") outlines May as the wettest month of the year. Weather in May »Weather in June
Continuing on with the warm trend, June in Chartres registers an average high temperature of 20.8°C (69.4°F) and an average low of 11.3°C (52.3°F). A slight rise in rainfall from 45mm (1.77") in May to 49mm (1.93") underlines the presence of June showers. Weather in June »Weather in July
July in Chartres is the pinnacle of summer with the highest temperatures of the year, reaching up to 23.6°C (74.5°F) and not falling below 13.4°C (56.1°F) even at night. The rainfall receives a bit of a pullback from 49mm (1.93") in June to 37mm (1.46"), making July drier than the previous month. Weather in July »Weather in August
Chartres in August face a slight drop in average temperatures, ranging between highs of 24.1°C (75.4°F) and lows of 14.3°C (57.7°F). Although the rainfall record of 37mm (1.46") in July only increases slightly to 34mm (1.34"), the humidity percentage falls noticeably from 75% to 70% marking one of the driest months of the year. Weather in August »Weather in September
September marks the beginning of autumn, with temperatures in Chartres falling from the summer peak to an average high of 20.7°C (69.3°F) and an average low of 11.4°C (52.5°F). A stark reduction in rainfall from 34mm (1.34") in August to 16mm (0.63") ranks September as one of the driest months of the year. Weather in September »Weather in October
Weather in Chartres during October records a noticeable drop in temperature from September, with averages ranging from highs of 16°C (60.8°F) to lows of 8.9°C (48°F). Rainfall patterns rise back up significantly, jumping from 16mm (0.63") in September to 28mm (1.1"). Weather in October »Weather in November
November witnesses further cooling trends in Chartres, France, as temperatures slide to an average high of 10.2°C (50.4°F) and an average low of 5.5°C (41.9°F). A continuous increase in rainfall from 28mm (1.1") in October to 36mm (1.42") in November underlines the onset of the rainy winter season. Weather in November »Weather in December
Chartres' weather during December hits the year's low, with temperatures chilling to a high of 7.2°C (45°F) and a low of 2.7°C (36.9°F). The reintroduction of snowfall, from 1mm (0.04") in November to 14mm (0.55") in December, signals the peak of winter. Weather in December »Updated: Feb 8, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January, noted for its average high-temperature of 6°C (42.8°F) and an average low-temperature of 1.3°C (34.3°F), is considered the coldest month.
The months with the highest humidity in Chartres are January and December, with an average relative humidity of 88%.
Throughout the year, in Chartres, France, there are 158.6 rainfall days, and 374mm (14.72") of precipitation is accumulated.
January through March, November and December are months with snowfall.
The month with the most snowfall in Chartres is January, when snow falls for 2 days and typically aggregates up to 22mm (0.87") of snow.
Throughout the year, in Chartres, France, there are 5.5 snowfall days, and 56mm (2.2") of snow is accumulated.
With an average of 3.8h of sunshine, January has the least sunshine of the year.
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Chartres.
In Chartres, France, snow does not fall in April through October.
June is the month with the most rainfall in Chartres. Rain falls for 17.4 days and accumulates 49mm (1.93") of precipitation.
June has the longest days of the year, with an average of 16h and 0min of daylight.
The months with the highest UV index are June through August, with an average maximum UV index of 5.
July and August, with an average of 8.9h of sunshine, are months with the most sunshine in Chartres.
August is the month when Chartres, France, experiences its warmest temperatures, averaging a high of 24.1°C (75.4°F) and a low of 14.3°C (57.7°F).
With an average relative humidity of 70%, August is the least humid month in Chartres.
The month with the least rainfall is September, when the rain falls for 10.1 days and typically collects 16mm (0.63") of precipitation.
On Sunday, 27. October 2024, at 03:00, Daylight Saving Time ends, and the time zone changes from CEST to CET. The next Daylight Saving Time starts on Sunday, 30. March 2025, at 02:00, and the time zone reverts from CET to CEST.
December has the shortest days of the year, with an average of 8h and 24min of daylight.
Average temperature
Chartres, France
The warmest month (with the highest average high temperature) is August (24.1°C).
The month with the lowest average high temperature is January (6°C).
The month with the highest average low temperature is August (14.3°C).
The coldest months (with the lowest average low temperature) are January and February (1.3°C).
Average pressure
Chartres, France
- Average pressure in January:
1017.8mbar - Average pressure in February:
1016.4mbar - Average pressure in March:
1016.6mbar - Average pressure in April:
1015.8mbar - Average pressure in May:
1016.9mbar - Average pressure in June:
1016.7mbar
- Average pressure in July:
1016.7mbar - Average pressure in August:
1016.7mbar - Average pressure in September:
1018.1mbar - Average pressure in October:
1017mbar - Average pressure in November:
1013.4mbar - Average pressure in December:
1018.5mbar
The month with the highest atmospheric pressure is December (1018.5mbar).
The month with the lowest atmospheric pressure is November (1013.4mbar).
Average wind speed
Chartres, France
- Average wind speed in January:
16.2km/h - Average wind speed in February:
17.2km/h - Average wind speed in March:
15.6km/h - Average wind speed in April:
12.7km/h - Average wind speed in May:
12.4km/h - Average wind speed in June:
11.9km/h
- Average wind speed in July:
11.6km/h - Average wind speed in August:
11.1km/h - Average wind speed in September:
11.6km/h - Average wind speed in October:
13.3km/h - Average wind speed in November:
15.5km/h - Average wind speed in December:
16.9km/h
The windiest month (with the highest average wind speed) is February (17.2km/h).
The calmest month (with the lowest average wind speed) is August (11.1km/h).
Average humidity
Chartres, France
The months with the highest relative humidity are January and December (88%).
The month with the lowest relative humidity is August (70%).
Average rainfall
Chartres, France
The wettest month (with the highest rainfall) is June (49mm).
The driest month (with the least rainfall) is September (16mm).
Average rainfall days
Chartres, France
- Average rainfall days in January:
12.6 days - Average rainfall days in February:
10.3 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
15.5 days - Average rainfall days in May:
17.7 days - Average rainfall days in June:
17.4 days
- Average rainfall days in July:
16.1 days - Average rainfall days in August:
12.5 days - Average rainfall days in September:
10.1 days - Average rainfall days in October:
10.7 days - Average rainfall days in November:
11.2 days - Average rainfall days in December:
11.7 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is September (10.1 days).
Average snowfall
Chartres, France
The month with the highest snowfall is January (22mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days
Chartres, France
- Average snowfall days in January:
2 days - Average snowfall days in February:
2 days - Average snowfall days in March:
0.2 days - Average snowfall days in April:
0 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.2 days - Average snowfall days in December:
1.1 days
The months with the highest number of snowfall days are January and February (2 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Chartres, France
- Average daylight in January:
8h and 48min - Average daylight in February:
10h and 12min - Average daylight in March:
11h and 54min - Average daylight in April:
13h and 42min - Average daylight in May:
15h and 12min - Average daylight in June:
16h and 0min
- Average daylight in July:
15h and 36min - Average daylight in August:
14h and 18min - Average daylight in September:
12h and 36min - Average daylight in October:
10h and 48min - Average daylight in November:
9h and 12min - Average daylight in December:
8h and 24min
The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in January:
3h and 48min - Average sunshine in February:
5h and 0min - Average sunshine in March:
5h and 48min - Average sunshine in April:
7h and 18min - Average sunshine in May:
7h and 42min - Average sunshine in June:
8h and 0min
- Average sunshine in July:
8h and 54min - Average sunshine in August:
8h and 54min - Average sunshine in September:
7h and 24min - Average sunshine in October:
5h and 48min - Average sunshine in November:
4h and 0min - Average sunshine in December:
4h and 6min
The months with the most sunshine are July and August (Average sunshine: 8h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days
Chartres, France
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
13.9 days - Average sunshine days in March:
15.3 days - Average sunshine days in April:
11.8 days - Average sunshine days in May:
9.8 days - Average sunshine days in June:
9.4 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
14.8 days - Average sunshine days in September:
17.7 days - Average sunshine days in October:
17.7 days - Average sunshine days in November:
16.5 days - Average sunshine days in December:
15.6 days
The months with the most sunshine days are September and October (17.7 days).
The month with the least sunshine days is June (9.4 days).
Average UV index
Chartres, France
The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Chartres, France
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 39).
Average visibility
Chartres, France
The months with the highest visibility are February, March, April, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, May and June (8km).
