Boissy-Saint-Léger Temperature by Month
The average annual maximum temperature in Boissy-Saint-Léger, Ile de France, France is 17°C (63°F), with daytime highs ranging from 8°C (46°F) in February to 26°C (79°F) in August. This page covers monthly averages, day-night differences, and how Boissy-Saint-Léger compares to cities worldwide.
Boissy-Saint-Léger Monthly Temperatures
The climate in Boissy-Saint-Léger is dynamic, ranging widely from chilly in winter to comfortable in summer. Nights are significantly colder, with lows dropping from 14°C (57°F) in August to 2°C (36°F) in February.
The chart below illustrates the average maximum day and minimum night temperatures in Boissy-Saint-Léger by month:
Low temperatures are most often recorded between 4 AM and 6 AM, while highs typically occur around 3 PM. August, the city's warmest month, sees 214 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Boissy-Saint-Léger vs France
The map below shows the annual temperature across France. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Boissy-Saint-Léger vs World: Temperature Compared
Boissy-Saint-Léger's average annual maximum temperature is 17°C (63°F). To put that in context, here's how it compares to a few well-known destinations:
Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
What Does the Temperature Feel Like in Boissy-Saint-Léger?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Boissy-Saint-Léger, February is the coolest month, with average highs of 9°C (48°F) and humidity around 78% — considered high. In August, the warmest month, temperatures average 26°C (79°F) with 71% humidity — conditions that feel high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Boissy-Saint-Léger's weather — including monthly rainfall, sunshine hours, and humidity — visit our Boissy-Saint-Léger climate page.
