Altena Temperature by Month
The average annual maximum temperature in Altena, North Rhine-Westphalia, Germany is 14°C (57°F), with daytime highs ranging from 5°C (41°F) in January to 23°C (73°F) in July. This page covers monthly averages, day-night differences, and how Altena compares to cities worldwide.
Altena Monthly Temperatures
In Altena, temperatures differ significantly between summer and winter months. Nighttime lows reflect this range, dropping from 13°C (55°F) in July to -1°C (30°F) in January.
The chart below illustrates the average maximum day and minimum night temperatures in Altena by month:
Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. July, the warmest month of the year, receives 223 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Altena vs Germany
The map below shows the annual temperature across Germany. You can also select individual months if you want to compare a specific time of year.
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Altena vs World: Temperature Compared
Altena's average annual maximum temperature is 14°C (57°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.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
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.
Seasonal temperature shifts influence more than just how warm it feels — they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.
Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Altena this rarely lasts long on the ground.
For more on Altena's weather — including monthly rainfall, sunshine hours, and humidity — visit our Altena climate page.
