Methodology
About ClimateAverages.com
ClimateAverages.com shows historical climate averages, live weather, and long term temperature trends for cities across 199 countries. Every figure on this site is built from real measured and reconstructed climate data, not estimates or guesswork.
Our data
The historical climate figures on this site come from collected temperature data covering thousands of weather stations worldwide, going back as far as 1750 in some locations. This data has been processed into a consistent, high resolution reconstruction for each city, allowing us to report monthly averages, warming trends, and historical extremes even for locations without a weather station directly on site.
Live weather conditions (today's temperature, humidity, wind, and similar figures) are supplied separately by WeatherAPI.com and refreshed multiple times a day for our most visited cities.
The 1951 to 1980 baseline
Most climate figures on this site, including average temperatures and warming totals, are measured against the period from 1951 to 1980. This is the standard reference period used across climate science, chosen because it predates most of the warming recorded since.
When you see a figure like "warmed by 2.0°C since 1900," it means the city's average temperature today is 2.0°C higher than it was in 1900, relative to this baseline.
What "average" means here
Average temperatures on this site reflect long term climate averages, not a single year's weather. A city's "average daytime high in July" is the typical July daytime high across many decades, not necessarily what the temperature will be this coming July. For that, check the live weather section on each city page.
Monthly data, not daily records
Our historical extremes (hottest and coldest months on record) are based on monthly average temperatures, not individual daily readings. This means a "record hot month" reflects an unusually warm month overall, not necessarily the single hottest day ever recorded in that city. We are upfront about this limit because we would rather be accurate than dramatic.
Data confidence and station coverage
Not every city has the same depth of historical data. Locations with more weather stations nearby and longer historical records naturally carry higher confidence than remote areas with sparse coverage. Each city page shows the number of stations within 200 km and the years covered, so you can judge the depth of data behind the figures yourself.
How often things update
Historical climate averages are static and do not change month to month, since they are long term baselines. Live weather conditions for our most visited cities are refreshed several times daily. If you notice something that looks out of date or incorrect, please get in touch.
Limitations
This site is designed to give a clear, accurate picture of climate averages and change over time. It is not a substitute for official meteorological forecasts, and should not be used for safety critical decisions such as severe weather planning. Always check your local official weather service for warnings and short term forecasts.