Climate of the Valley-of-Marne

The climate of the the Valley-of-Marne is a oceanic Climat degraded with semi-continental nuances.

Temperatures

The average temperatures are almost always higher than 3°C the winter and lower than 20°C the summer. This softness of the temperatures is a oceanic character.

Pluviometry

The Valley-of-Marne receives less than 650 mm of water per annum on average.

The rains fall in autumn and the maximum ones are located in summer in the form of storms.

Snow is rare: less than 11 days per annum on average.

Influences of the urbanization

The intense urbanization modifies the climate locally and atmospheric pollution is cause of a loss from 15 to 20% of the total solar radiation. The variation of heat between the countryside close to Paris and the center is of 2,5°C on average annual. It can in the case of reach approximately 8°C with the survey of the sun a weak wind and one night without cloud. The variation is felt more the night that the day, this phenomenon is related to concreted surfaces which accumulate the heat of the day and especially the wind which blows less during the night. The heat of the dwellings, the motor vehicle traffic inter alia are consequences of the small island of heat.

From 30 to 40 km of the center the number of days of per annum cold is higher than 40 whereas it is of 15 with the Turn-St-Jacques (center of Paris). Remotely center of the capital one equalizes observes there less days of fog in the east than in the west, because the dominant winds are of west. If the capital counts on average 6 days of fog per annum over the period 1992 - 2001, the twenty day old line of fog cuts the department of the Valley-of-Marne into two, leaving Creteil with the top of this list and Orly (23) in lower part.

Even reflection for the number of the days of frozen with a twenty day old line of cold per annum girdling Paris and a thirty day old line following the same layout as that of the days of fog.

Wind

weather episodes

Among the last weather episodes which touched the department let us quote:

the Storm of 1999 with points of 173 km/h in Orly around 6 hours of the morning the December 26th 1999,
the Heat wave of 2003 with a surmortality of 171% in August 2003, is the most rate in France.

Equipment

The principal weather station of the department is that of Saint-Maur-of-Ditches, which refers for the Valley-of-Marne. It is there that was measured the temperature record for all the Île-de-France since more than one century: 42°6 the August 6th 2003. Other data: 40°3 at Houses-Alfort; 39°5 in Paris Montsouris. With Saint-Maur-of-Pits the estival maxima of the island of France are often established downtown this; the topography of the places being particuliére; low plate of Champigny in the east plate of Gravel in the west, final basin of the plain of Creteil cutting the winds can explain the variations with Paris but also the remainder of the plain of Creteil. There is thus business with a micro climate of shelter (very frequent situation in Ile-de-France).

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