By Markus Fischer
Vienna’s shifting weather patterns
Vienna has traditionally experienced four distinct seasons: cold, sometimes snowy winters; mild springs; warm summers with occasional heavy rain; and colorful, crisp autumns. However, local climate data shows clear shifts. Since the 1970s, Vienna’s annual mean air temperature has increased by nearly 3 °C. Winters are becoming milder with less frequent snow cover, and summers hotter and longer.
Climate normals and seasonal extremes
Based on 1991–2020 climate normals, July is usually Vienna’s warmest month with average highs around 26 °C, while January tends to be coldest, often close to or slightly below freezing at night. Rainfall is not tied to a single rainy season; summer months — June and July especially — tend to bring the highest precipitation.
Recent trends: heat days and emission reductions
Recent years have seen a rise in the number and duration of heat waves. For example, Vienna recorded several heat waves between June and September, including days with temperatures exceeding 35 °C. Parallel to warming, the city has made progress in reducing greenhouse gas emissions. Emissions from non-EU-ETS sectors (like transport, buildings, waste) relevant to climate goals have fallen 24 % between 2005 and 2023.
Environment & air quality
Vienna continues to enjoy relatively clean air compared to many European capitals. In 2025, levels of particulate matter (PM10, PM2.5), nitrogen dioxide (NO₂), and ozone (O₃) were among the lowest in two decades. Still, hotspots occur in areas with heavy traffic or during days of stagnant air.
What this means for everyday life
- Health risks: More heat days stress vulnerable groups; shading, hydration, and cooling strategies become more critical.
- Changing lifestyle: Seasonal activities may shift; spring and autumn see more unpredictable weather; snow in winter less reliable.
- Planning and infrastructure: The city is investing in green infrastructure — façade and roof greenery, unsealed surfaces, tree planting — to cool urban heat islands and improve air quality.
What you can do
Residents can adapt locally: support clean transit, plant trees or greenery where possible, reduce energy use in buildings, and stay informed about air quality alerts. Small actions collectively help Vienna stay livable as the climate continues to change.