Lyon’s Coldest Month: January’s Chill and What to Expect

Published by Sandrine Météocity, December 13, 2025 at 3:13 PM

Every winter, Lyon experiences its share of shivers. But which month truly earns the title of the coldest? This isn’t just a trivial observation; it impacts daily life, energy management, and future climate challenges. Let’s delve into Lyon’s climate, supported by key figures, and look ahead to 2050.

January: The Most Glacial Month in the Rhône Region

In the Lyon metropolitan area, January stands out as the coldest month of the year. Climate normals, calculated by Météo-France (reference period 1991-2020), indicate an average minimum temperature of 1°C, while the maximum rarely exceeds 6°C. Freezing temperatures are common, especially on clear nights, and snowy episodes, though sometimes fleeting in the city, are not rare.

From mid-December, the mercury drops significantly, but it’s in January that the cold reaches its peak intensity, before a slow rise in February and then March. Historical cold records in Lyon attest to past severity, such as the -20°C measured during the winter of 1956 or the -15°C of January 1985.

Average Monthly Temperatures in Lyon: Comparative Table

The contrast is clear between the harsh winter and the summer peaks in July-August, around 28°C.

Lyon: A Climate Under Continental Influence

Lyon enjoys a semi-continental climate, characterized by pronounced seasonal variations. Winter regularly brings cold fronts from the north. Despite its distance from the coast, Lyon’s winters are moderated by the presence of the Rhône River, which sometimes limits extreme cold thanks to the relatively mild air masses coming from the Mediterranean.

The history of temperatures in Lyon reveals periods of intense cooling, alternating with milder winters in recent decades. Annual rainfall averages 830 mm, with a peak in spring and autumn. The average number of rainy days in Lyon is around 90 per year.

In September, the average temperature is around 14°C in the morning and 23°C in the afternoon, offering a gentle transition to autumn.

Lyon’s Changing Climate: Perspectives for 2050

Projections from numerical models (Copernicus, IPCC) forecast a global increase in annual temperatures for Lyon by 2050, ranging from +1.5°C to +2.5°C depending on the scenarios. Winters could become less severe, with an expected decline in exceptional cold snaps, but also an increased risk of extreme weather events, such as intense rainfall or late frosts.

The climate of Lyon today will not be exactly the same tomorrow. Regular monitoring of weather data and its collective understanding are becoming major challenges for the adaptation of the city and its inhabitants.

Practical Advice / Key Takeaways

• During January in Lyon, plan to wear very warm clothing, especially for morning activities.
• Stay attentive to weather forecasts, especially during cold or snow alerts, to adjust travel plans.
• Remember to check that your heating is working properly and to limit heat loss in your home.
• Vulnerable individuals (young children, elderly) should avoid prolonged outdoor exposure during freezing conditions.
• Anticipate potential transport disruptions due to snowy episodes, which are still possible even if rare.

FAQ – Cold, Rain, Climate in Lyon: 5 Key Questions

Which is the coldest month in Lyon?

January remains the coldest month of the year, with an average minimum temperature of 1°C and frequent frosts.

How many rainy days does Lyon have each year?

There are approximately 90 rainy days per year in Lyon, mainly distributed in autumn and spring.

What is the average temperature in Lyon in September?

In September, Lyon averages 14°C in the morning and 23°C in the afternoon, offering mild conditions at the beginning of autumn.

Is Lyon’s climate really changing?

Yes, according to forecasts, Lyon is expected to experience significant warming by 2050, with milder winters but more extreme weather risks.

What actions should be taken during severe winter cold snaps?

Wear warm layers of clothing, limit exposure to low temperatures, improve home insulation, and regularly follow weather information and alerts.

Source: https://actus.meteocity.com/actualites-meteo/quel-est-le-mois-le-plus-froid-de-lannee-a-lyon-decryptage-meteo-et-chiffres-cles-3107