Weather in Gagra
Precipitation in radius 15 and 45 km from center, mm
The color indicates how much precipitation falls in three hours by the specified time. For example, at 12:00 it is shown how much precipitation will fall from 9:00 to 12:00
Hover the cursor to see the exact amount of precipitation in the square 15 × 15 km.
Wind , m/s , mph , km/h
Weather on roads
Pressure , mmHg , inHg , hPa
Relative humidity, %
Sun and Moon
Ultraviolet index, points
Geomagnetic activity, Kp-index
Weather on the map of Europe
The sun is the source of life on the planet. Its rays provide us with much needed light and heat. However, ultraviolet radiation from the sun is harmful to all living things. To find a balance between beneficial and harmful effects of the sun, meteorologists estimate the ultraviolet index that reflects the degree of its danger.
Types of ultraviolet radiation from the sun
Ultraviolet radiation from the sun has a range of wavelengths and is divided into three types, two of which reach the Earth’s surface.
UVA. Long-wave radiation covering the range from 315 to 400 nm
The rays almost freely pass through all atmospheric ‘barriers’ and reach the Earth’s surface.
UVB. Medium-wave radiation covering the range from 280 to 315 nm
90% of the rays are absorbed by the ozone layer, carbon dioxide and water vapor.
UVC. Short-wave radiation covering the range from 100 to 280 nm
The most dangerous type. It is completely absorbed by stratospheric ozone before reaching the Earth’s surface.
The more ozone, clouds and aerosols the atmosphere has, the less harmful the sun’s effects are. However, those saving factors have a high natural variability. Stratospheric ozone exhibits seasonality with maximum in spring and minimum in autumn. Cloudiness is one of the most unstable weather characteristics. Carbon dioxide levels also change over time.
What UV index is dangerous?
The UV index shows the amount of UV radiation expected to reach the Earth’s surface. The UV index ranges on a scale of 0 (Low) to 11+ (Extreme).
- 0 – 2 Low
- 3 – 5 Moderate
- 6 – 7 High
- 8 – 10 Very high
- 11+ Extreme
In mid-latitudes, the UV index reaches unsafe values (6-7) only when the sun is at its maximum elevation (late June — early July). At the equator, the UV index ranges from 9 to 11+ throughout the year.
Positive effects of ultraviolet radiation
Small amounts of UV radiation are beneficial to people, play an essential role in the production of melanin, serotonin and vitamin D, and help prevent rickets.
Melanin creates a barrier to protect the skin cells from the harmful effects of the sun. It makes our skin darker and more elastic.
‘Happiness hormone’ serotonin improves our health: it boosts mood and increases overall vitality.
Vitamin D strengthens the immune system, stabilizes blood pressure and prevents rickets.
What are the dangers of the sun?
When tanning, you should remember there is a fine line between beneficial and harmful UV radiation. Excessive tanning is similar to a burn. Ultraviolet radiation damages DNA in skin cells.
The protective system of the body cannot cope with such an aggressive impact. It lowers immunity, damages the retina, accelerates skin ageing and can cause cancer.
How does the sun affect people?
Susceptibility to UV radiation depends on skin type. People of European descent are the most sensitive to the sun and need protection when the index reaches 3, while the index of 6 is considered dangerous.
At the same time, the limits for Indonesians and African-Americans stand at 6 and 8, respectively.