Climate
Climate

THE MAIN WEATHER AND CLIMATE FEATURES OF THE NORTHERN HEMISPHERE IN MAY 2017


Air Temperature.


The last May of the European territory of Russia (ETR) will come to mind for the population for a long time as a cold and rainy. The often intrusions of the Arctic cold caused the record colds and even frosts during all month. The average monthly air temperature was below the norm in all federal districts. In Central Russia – approximately by 2°, in the Russian North – up to 4°. Almost daily somewhere the new minimum temperature records were registered. The negative temperature anomalies in May, similar to the present ones, were observed here the last time in 2008, and in general every decade in the Russian Plain was marked with at least one such cold May. Sometimes it has happened even more frequently. For instance, during the 90th of the last century it has happened triple times over the decade (in 1990, 1994 and 1999).
In Siberia and most part of Far East the warmth and cold swapped each other. Instead of the heat of 25-30° (Republic Tuva, Transbaikalia, Irkutsk district) frosts
of -10° and colder came (south of West Siberia, Republic Tuva, Altai, south of Krasnoyarsk district). As a result, the average monthly air temperature in the most part of these areas was close to the norm, with small negative anomalies in Yakutia and with positive ones in the other territory. And only in Kemerovo region, in Altai and Tuva Republics and Chukchi Autonomous District and Jewish Autonomous Region the temperature norms were noticeably exceeded (by 2° and more).
The hot weather dominated in the east of Asia. In Beijing the air temperature reached +37°. In the north of the country, in Japan and Korean peninsula the average monthly air temperatures exceeded the norm by 2-3°, in Mongolia – by 3-5°. In China the last May is the third warmest one on the record after 2007 and 2012.

 

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The main weather and climate features of the northern hemisphere in April 2017

Air Temperature

In the European territory of Russia (ETR) the temperature conditions were substantially different. In the first ten-day period the March abnormally warm weather was kept. In the north-west and centre of ETU the air temperature anomalies over the first decade reached +3…6 and more. Here were the numerous warm records: Kaliningrad, Pskov, Smolensk, Bryansk, etc. But in the second ten days cold penetrated here, and ten-days period temperature anomalies have set -2…-3°. In the third decade the cold reached the south Russian border. Average decade temperature anomalies exceeded -3…-4°. In the west and central ETR regions, in Volga area and in the south (Crimea, Krasnodar, Stavropol districts) the new daily temperature minimums were achieved. In Smolensk district the frosts reached -15°, Tambov - -9°, the light frosts were even in the south – Rostov district, Stavropol district and in Republic of North Ossetia-Alania. The warmth came to the Central Russia only in the last day of the month.

Striking contrast of ETR became the temperature on the east of Urals. If in Urals, particularly its northern part, in the first and second decade the temperature conditions corresponded to the norm, and abnormal warmth came here only in the third decade, but in Siberia and in Far East it dominated all month long. The average decade temperature anomalies reached here +7…8°. In the north of Far East the April 2017 is the warmest on the country record. In Siberia, seven out of ten warmest Aprils occured in XXI century.

 

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The key weather and climate features in the northern hemisphere in March 2017

Air Temperature.

Average March air temperature of 2017 in the Russian Federation is the highest on the record, i.e. on the last 127 years. It exceeded the former record of March 1990 by 1.5°. The first three months of the recent year are also the warmest ones on the record.

In March 2017 the highest average monthly air temperatures were reached in Ural, Siberia Federal Districts and in the north of Far East Federal Districts. In Central Federal District and in the south of Far East Federal District they have got the second rank amongst the highest values, in the North-West Federal District – the third one.

During the month in many regions of the country the new temperature maximums were reached, including the monthly absolute maximums. The air temperature norms were exceeded countrywide, in the centre – by 4-5°, in Urals, Siberia and in the north of Far East – by 7-12°. Sometimes, in Kamchatka region daily maximums were recorded during five-eight days in succession. Never before in Russia there were so large average monthly air temperature anomalies at vast territory.

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The key weather and climate features in the northern hemisphere in February 2017

Air temperature.

At the beginning of February in the central and southern areas of the ETR it was chilly, in some places cold weather, which came here in the end of January. Air temperature anomalies in the first decade reached -3.5°. Only in Russian North it was abnormally warm. In the middle of the month this warm sector extended and captured the most part of the Central region and Volga area, casted away the abnormal cold far to the south, to Crimea and North Caucasus, where the temperature anomalies took place (to -3°) in the second decade of the month. In the third decade the early spring warmth came almost to the all territory of ETR. Temperature anomalies reached +6…+8°. In Central Russia, Volga area, in the west of the country and in the North Caucasus the new temperature maximums were recorded. Only in the north the temperature at that moment corresponded to the norm or was relatively higher. If in the beginning and middle of the month in the Russian North temperatures reached the maximum values, in 20th the frosts came here up to -40°.

 

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The key weather and climate features in the northern hemisphere in January 2017

Air temperature

One can say about Russia’s first month of the year, that “it goes hot and cold”. Actually, except Arctic islands and south areas of Far East, it is no one large region when average decade temperature anomalies would keep a sign. In Russian North, Urals and Upper Volga the frosts in the first month decade reached -40…-50° and more, anomalies of this period were -6…-13°. But in the second decade the warmth came here and although the anomalies were the same by value, but they had the opposite sign. In the south of Russia the abnormal warmth of the first decade, with the new temperature maximums in Crimea and Krasnodar region, changed by the frosts to -20…-25° in Krasnodar region and -10° in Sochi area. The new temperature minimums were registered at that time and seldom for these places phenomena  - brash ice and fast shore ice in Kerch strait and at the Crimea and Caucasus shore.

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The key weather and climate features in the northern hemisphere in December 2016

Air temperature

The November colds in Russia became more severe in the last month of the year. The frosts attacked the European territory of Russia (ETR), the Urals, central and northern parts of Siberia and Yakutia all first part of December. In the ETR north, in Volga area, Urals, West Siberia the new daily lows repeatedly took place. In Yakutia the temperature dropped down to -56°, in the Ural north – below -40°, in Volga area - -35°. Even in the south, in Kislovodsk the temperature -17°, in Crimea - -15° and in Sochi area - -10° was registered. The decade average temperature anomalies reached -8°…-13°. Frosts decreasing became in the third decade of the month. And, although decade average temperatures, as before, were negative on the most part of the abovementioned territories, the substantial warming came to the Russian North, Central region and Upper Volga area. At the average, in the third decade it was warmer than usual by 4-11°.

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