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Climate Change in Saxony
Basic Information
Source of observational data used: German
Weather Service, Czech Hydro-Meteorological
Service
Averaging time periods: Normal climate period
1961-1990 (Reference), 1981-2010; Decades
1961-1970, …, 2001 -2010
Classification
Climate change is occurring globally and has
different effects regionally.
Anthropogenic influence (greenhouse gas
emissions in particular), with a probability
greater than 95%, is the main cause of warming
since the mid-20t
h
century (IPCC, 2013).
Saxony follows this development. The decade
2001-2010 was the warmest on record (Fig. 1).
Fig. 1: Anomalies in (K) the annual average air
temperature vs. the 1961-1990 reference period
Air Temperature
Continued warming with
rising heat stress in the
summer months.
Increase in the average annual temperature of
approximately 1 °C, Fig. 2
Number of summer days (Tmax > 25 °C) per
year increased significantly, particularly outside
the low-mountain range: from 28 days(1961-
1990) to 35 days (1981-2010, + 25 %), Fig. 2
Number of frost days (Tmin < 0 °C) per year
decreased from 95 days (1961-1990) to 92
days (1981-2010, - 3 %).
Severity of winters: increasing trend of
fluctuations by decade and from year-to-year.
Fig. 2: Average annual air temperature in (°C) and
number of summer days per year
Relative Sunshine Duration
Relative sunshine duration, (percentage
measured by maximal possible sunshine
duration,) increased from 32 % (1961-1990) to
34 % (1981-2010), Fig. 3.
A reason for this is improved air quality,
(reduced content from aerosols in the air).
Fig. 3: Annual average of relative sunshine duration
in (%)
Precipitation
The fluctuations in annual
precipitation
accumulation
are more pronounced than their
trend.
In the summer (Apr- Sept): reduction in the
growing season I
(April to June)
– heightened
risk of drought
– Increase in the growing season
II (July to September), Fig. 4.
Data and Facts – Data and Facts – Data and Facts – Data and Facts – Data and Facts – Data and Facts – Data and Facts
Anomalies in Air Temperature
(Reference period 1961-1990)
Air Temperature and Summer Days
Relative Sunshine Duration
(Percentage measured by potential sunshine duration)
Air Temperature
Summer Days
Air Temperature
Summer Days
Germany
Saxony
Relative Sunshine Duration
Anomaly

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Fig. 4: Average precipitation accumulations in (mm)
for the meteorological summer (Apr-Sept)
Extensive increase especially in the
frequency
(particularly in the growing season II, in the
average area of
18 %
, Fig. 6) and
intensity
of
heavy rain
events R90p and R95p (including
the greatest 10 % resp. 5 % of existing
measured values in a course of time) per year,
Fig. 5.
Fig. 5: Core areas of changes for heavy rain events
(R90p, R95p) 1981-2010 vs. 1961-1990, above:
frequency (ratio in-/ decrease: 12:1)
, below:
intensity
(ratio in-/ decrease: 6:1)
Increase in the ratio of heavy rain to precipitation
accumulation in the
growing season II,
i.e. dry
periods will be broken by heavy rain events, thus
increasing risk of erosion
Fig. 6: Changes in the probability in (%) of
occurrence heavy rain events R95p, 1981-2010 vs.
1961-1990, growing season II
Climatic Hydrological Balance
Difference from corrected precipitation
(corrected for measurement errors caused by
wind) and potential evaporation exhibited by
pronounced seasonal cycles. (Fig. 7)
Fig. 7: Average seasonal cycle of climatic water
balance (mm), Dresden-Klotzsche (1981-2010)
In summer (Apr-Sept): Worsening in the growing
season I, improvement in the growing season II
Sources and Links:
HadCRUT4 (Fig. 1):
www.cru.uea.ac.uk
IPCC (2013): Climate Change 2013 - The
Physical Science Basis,
www.climatechange2013.org
LfULG (2014): Analysis of the Climate
Development in Saxony , series (in progress)
Regional Climate Information System of Saxony,
Saxony-Anhalt and Thuringia:
www.rekis.org
Department: 5
Telephone: 0351/2612 5116
E-Mail: johannes.franke@smul.sachsen.de
www.smul.sachsen.de/lfulg
Current as of: 15.12.2015
Precipitation
(corrected for measurement errors caused by wind)
Climatic Water Balance
(precipitation RK minus potential evaporation ET)
Heavy Rain R95p
Probability of exceedance (%)
Growing season II
Changes 1981-2010 vs 1961-1990
Heavy Rain R90p, R95p
Average intensity per event day
Core areas of changes
1981-2010 vs. 1961-1990
Year
Heavy Rain R90p, R95p
Frequency
Core areas of changes
1981-2010 vs. 1961-1990
Year
Increase
Decrease
Precipitation
Climatic Water Balance
positive
negative