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About

The meteorological station is maintained by the Itia Research Team. Other people who have helped us are K. Konstandinides, Nassos Papakostas, Panagiotis Christias, Rania Tsoumani, K. Kouridakis, D. Kouvas (ScientAct SA), Anna Patrikiou, Gianna Stamataki, Andreas Sakellariou, Alexandros Manetas, and the Network Management Centre of NTUA.

You can contact us at meteo@itia.ntua.gr.

More information, pictures, and historical data for the station are available at openmeteo.org.

© 1992–2016 National Technical University of Athens

FAQ

What is the weather usually like in Athens?

According to measurements by the National Observatory of Athens at Thission, near the centre of the city, the table below shows statistics for the period 1961–1990. The temperatures given are the average minimum and the average maximum. This tells you the variation of the temperature through a usual day.

M Usual temperature range (°C) Average relative humidity (%) Total rainfall (mm) Rainy days Average daily sunshine duration (hours)
Jan 6.5–12.9 72 44.6 13 4.5
Feb 6.9–13.6 71 48.3 13 5.1
Mar 8.4–16.0 68 42.6 11 6.0
Apr 11.6–20.3 62 28.2 10 8.0
May 15.4–25.3 58 17.2 7 9.8
Jun 20.1–29.8 52 9.7 5 11.4
Jul 22.5–32.6 48 4.2 2 12.1
Aug 22.3–32.3 49 4.6 2 11.5
Sep 19.2–28.9 56 11.9 3 9.4
Oct 14.9–23.1 66 47.7 9 7.0
Nov 11.4–18.6 73 50.6 11 5.5
Dec 8.3–14.7 73 66.6 13 4.4

Do you have data for other locations in Greece?

No. You may be able to find some data at the Hydroscope web site. Otherwise you'll need to contact the Public Power Corporation or the National Meteorological Service.

Is there a second meteorological station in NTUA?

In these pages you can find information for our station only. The other meteorological station is maintained independently by another team, and has its own web pages. The following map shows the locations of both stations; ours is the southwest one.

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I see that the temperature is 3°C. I read about the clothing of the ancient Athenians, and it doesn't seem to be suitable for such cold. Has the climate changed significantly over those 2500 years?

The temperature in Athens usually stays above 10°C. It is only for a few days in winter, about 10 altogether, that it goes below, and it may go as low as about 0°C. The ancient Athenians' clothes consisted of the chiton, tunic, usually made of linen and worn next to the skin, and the himation, an outer garment resembling a cloak, usually made of wool and worn only outdoors. We do not know the details, but maybe during winter they used a heavy type of himation which was sufficient protection from the cold.

We haven't seen any evidence of significant climate change in these 2500 years.

What is a micromol? How do I convert it to energy units?

Solar radiation is often measured in micromol/s/m², which is also called a microeinstein/s/m². A micromol means a micromol of photons, that is, 6.022*10¹⁷ photons. Micromol measurements are used by agronomists, because the amount of photosynthesis a plant performs depends on the number of photons, not on their energy. Engineers usually need the energy.

The energy of a photon depends on its frequency; a blue photon has different frequency and energy than a red photon. In order to convert micromoles to energy units the composition of light must be known, and this differs according to season, time of day, and weather conditions. Thus, you can't really convert micromoles to energy units. If you need the energy, you should use the data from our sensor that measures solar radiation in energy units.

If you need to know diffuse radiation in energy units, you can make the assumption that the ratio of diffuse micromols to total micromols is the same as the rate of diffuse energy to total energy (this is what we do in the solar radiation chart), and thus calculate diffuse radiation in energy units since our sensors give you all the rest. The assumption is not accurate; diffuse radiation has more blue, whereas direct radiation is more white. However, this assumption is probably the best approximation you can do if you don't have other data.