 Winter romanticism by the river
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| Climate and environment |
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Climatically, the Cologne region is part of the North-West German lowlands, and is influenced by the Atlantic Ocean, and the North Sea. Cologne has a mild climate; the daily and yearly fluctuations in temperature are subdued, and precipitation is spread relatively uniformly throughout the year. In winter, the Cologne region is one of the warmest areas in Germany; snow which stays on the ground longer than a few days is the absolute exception. This advantage (at least for car drivers), is at the expense of a relatively large number of overcast days, and thus, in comparison to other German cities, the number of hours of sunshine is below average, as well air humidity being higher. As an industrial location (»chemistry belt« and lignite power stations in the West of the city), Cologne was liable to high air pollution until well into the 1960s; the drastic increase in road traffic naturally also contributed to this. Biologically, the Rhine was largely a dead river. Following the desulphurisation of smoke from the power stations, and the introduction of the catalytic converter, the people of Cologne and visitors can once again breathe deeply. Thus, the yearly mean value of sulphur dioxide in the mid-1960s, in some cases of over 100 micrograms/m3, fell drastically at the end of the 1990s to 10 micrograms/m3. In the same period, the average carbon monoxide value also fell from 8 to 2 milligrams/ m3. Even the Rhine has once again become a relatively clean river through the joint efforts of the bordering states, and massive investment in purification plants, and has attracted back many species of fish such as, for example, the salmon.
| Month |
Average temperature
(in °Celsius) |
Average sunshine daily (in hours) |
Rainfall
(in mm) |
| January |
2,0 |
1,3 |
55 |
| February |
2,7 |
3,7 |
52 |
| March |
6,1 |
2,3 |
41 |
| April |
9,8 |
4,0 |
51 |
| May |
14,1 |
2,9 |
58 |
| June |
17,2 |
7,0 |
76 |
| July |
18,7 |
8,5 |
68 |
| August |
15,4 |
7,7 |
81 |
| September |
15,4 |
4,1 |
59 |
| October |
10,7 |
3,2 |
53 |
| November |
6,4 |
3,3 |
60 |
| December |
3,2 |
1,8 |
65 |
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