Roisan Temperature by Month
Roisan in Valle d'Aosta, Italy sees significant seasonal temperature differences, with daytime highs between -5°C (23°F) in January and 17°C (63°F) in July, averaging 6°C (43°F) annually. Explore the full monthly breakdown below.
Roisan Monthly Temperatures
The weather in Roisan experiences significant differences between warm and cold seasons, with big shifts in temperature. At night, minimum temperatures range from 7°C (45°F) in July to -13°C (9°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Roisan by month:
The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. July, the city's warmest month, gets 275 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Roisan vs Italy
The map below shows the annual temperature across Italy. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Roisan vs World: Temperature Compared
Roisan's average annual maximum temperature is 6°C (43°F). To put that in context, here's how it compares to a few well-known destinations:
Athens, Greece sits at 23°C (73°F) on average, with hot dry summers and mild winters characteristic of the Mediterranean.
Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.
Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters — and seasons reversed compared to Europe.
Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.
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.
Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.
Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.
For more on Roisan's weather — including monthly rainfall, sunshine hours, and humidity — visit our Roisan climate page.
