, with cold winters and hot summers.
The city is located in eastern Bulgaria, 90 km (55 mi) from the sea, at the northern limit of the Thracian plain, at an altitude between 200 and 300 meters (650 and 1,000 feet), and a short distance from the mountains, the eastern part of the Balkan mountains (in particular, the Sinite Kamani massif).
is cold. In periods when the atmosphere is stable, there can be cold, foggy days. There are some mild periods, with highs of 15 °C (59 °F) and more, but also cold waves, during which the temperature can drop to -10/-12 °C (10/14 °F) or even below. The cold record is -15.4 °C (4.3 °F), set in January 1963 and in January 2006.
is hot and sunny, although thunderstorms can sometimes break out in the afternoon.
Due to the altitude, Sliven is a little less hot than other cities in the region, however, there can be very hot periods here as well, with highs of 35 °C (95 °F) or more. The highest record is 42 °C (107.5 °F), recorded in July 2000 and in July 2007.
to visit Sliven are spring and autumn, namely from mid-May to mid-June, a period when some afternoon thunderstorms must be put into account, and from mid-September to mid-October, a period a bit cooler but also drier. In summer, the heat is sometimes bearable, while at other times, especially in July and August, it can be intense.
. Here are the average temperatures.
January, the coldest month of the year, is generally a cold month. The average temperature is of
2.5 °C, with a minimum of
-1.1 °C and a maximum of
6 °C.
On the coldest nights of the month, the temperature usually drops to around
-9.5 °C. However, it dropped to
-15.4 °C in January 2006.
On the warmest days of the month, the temperature usually reaches around
14.5 °C. However, it reached
21.2 °C in January 2002.
Precipitation amounts to
45 mm, distributed over 6 days.
The day lasts on average 9 hours and 30 minutes.
There are on average 3.5 hours of sunshine per day. So, the sun shines 35% of the time.
The average humidity is 82%. Hence, the air is normally humid.
February is generally a quite cold month. The average temperature is of
4.2 °C, with a minimum of
0.1 °C and a maximum of
8.3 °C.
On the coldest nights of the month, the temperature usually drops to around
-7.5 °C. However, it dropped to
-13.5 °C in February 1991.
On the warmest days of the month, the temperature usually reaches around
17 °C. However, it reached
22.8 °C in February 2002.
Precipitation amounts to
45 mm, distributed over 5 days.
The day lasts on average 10 hours and 35 minutes.
There are on average 4.5 hours of sunshine per day. So, the sun shines 42% of the time.
The average humidity is 81%. Hence, the air is normally humid.
March is generally a quite mild month. The average temperature is of
7.7 °C, with a minimum of
3.1 °C and a maximum of
12.4 °C.
On the coldest nights of the month, the temperature usually drops to around
-3.5 °C. However, it dropped to
-11.4 °C in March 2018.
On the warmest days of the month, the temperature usually reaches around
21.5 °C. However, it reached
27.4 °C in March 2001.
Precipitation amounts to
40 mm, distributed over 7 days.
The day lasts on average 12 hours and 0 minutes.
There are on average 5 hours of sunshine per day. So, the sun shines 43% of the time.
The average humidity is 76%. Hence, the air is normally humid.
April is generally a mild month. The average temperature is of
12.6 °C, with a minimum of
7.4 °C and a maximum of
17.9 °C.
On the coldest nights of the month, the temperature usually drops to around
1.5 °C. However, it dropped to
-2.5 °C in April 1997.
On the warmest days of the month, the temperature usually reaches around
25 °C. However, it reached
29.6 °C in April 2013.
Precipitation amounts to
40 mm, distributed over 7 days.
The day lasts on average 13 hours and 25 minutes.
There are on average 7 hours of sunshine per day. So, the sun shines 51% of the time.
The average humidity is 71%. Hence, the air is normally humid.
May is generally a very mild month. The average temperature is of
17.6 °C, with a minimum of
12.2 °C and a maximum of
23.1 °C.
On the coldest nights of the month, the temperature usually drops to around
6 °C. However, it dropped to
1.9 °C in May 1999.
On the warmest days of the month, the temperature usually reaches around
29.5 °C. However, it reached
34.5 °C in May 2003.
Precipitation amounts to
65 mm, distributed over 9 days.
The day lasts on average 14 hours and 40 minutes. So the days are long.
There are on average 8 hours of sunshine per day. So, the sun shines 56% of the time.
The average humidity is 70%.
June is generally a warm month. The average temperature is of
21.9 °C, with a minimum of
16.3 °C and a maximum of
27.4 °C.
On the coldest nights of the month, the temperature usually drops to around
11 °C. However, it dropped to
4.6 °C in June 2009.
On the warmest days of the month, the temperature usually reaches around
34 °C. However, it reached
41.1 °C in June 2007.
Precipitation amounts to
70 mm, distributed over 7 days.
The day lasts on average 15 hours and 20 minutes. So the days are long. June 21, the summer solstice, is the longest day of the year in the Northern Hemisphere.
There are on average 9.5 hours of sunshine per day. So, the sun shines 63% of the time.
The average humidity is 67%.
July is generally a warm to hot month. The average temperature is of
24.4 °C, with a minimum of
18.6 °C and a maximum of
30.1 °C.
On the coldest nights of the month, the temperature usually drops to around
14.5 °C. However, it dropped to
10.1 °C in July 2011.
On the warmest days of the month, the temperature usually reaches around
36 °C. However, it reached
42.2 °C in July 2007.
Precipitation amounts to
50 mm, distributed over 6 days.
The day lasts on average 14 hours and 55 minutes. So the days are long.
There are on average 10.5 hours of sunshine per day. So, the sun shines 70% of the time.
The average humidity is 64%.
August, the warmest month of the year, is generally a warm to hot month. The average temperature is of
24.5 °C, with a minimum of
18.6 °C and a maximum of
30.4 °C.
On the coldest nights of the month, the temperature usually drops to around
13.5 °C. However, it dropped to
9.4 °C in August 1991.
On the warmest days of the month, the temperature usually reaches around
36 °C. However, it reached
39.9 °C in August 2012.
Precipitation amounts to
40 mm, distributed over 4 days.
The day lasts on average 13 hours and 50 minutes.
There are on average 10 hours of sunshine per day. So, the sun shines 74% of the time.
The average humidity is 64%.
September is generally a warm month. The average temperature is of
19.8 °C, with a minimum of
14.3 °C and a maximum of
25.2 °C.
On the coldest nights of the month, the temperature usually drops to around
9 °C. However, it dropped to
5.6 °C in September 2018.
On the warmest days of the month, the temperature usually reaches around
32 °C. However, it reached
35.8 °C in September 2009.
Precipitation amounts to
65 mm, distributed over 5 days.
The day lasts on average 12 hours and 25 minutes.
There are on average 8 hours of sunshine per day. So, the sun shines 65% of the time.
The average humidity is 67%.
October is generally a mild month. The average temperature is of
14.3 °C, with a minimum of
9.7 °C and a maximum of
18.9 °C.
On the coldest nights of the month, the temperature usually drops to around
2.5 °C. However, it dropped to
-2.5 °C in October 1991.
On the warmest days of the month, the temperature usually reaches around
27 °C. However, it reached
34 °C in October 1991.
Precipitation amounts to
50 mm, distributed over 5 days.
The day lasts on average 11 hours and 0 minutes.
There are on average 5.5 hours of sunshine per day. So, the sun shines 50% of the time.
The average humidity is 73%. Hence, the air is normally humid.
November is generally a mild month. The average temperature is of
8.7 °C, with a minimum of
4.8 °C and a maximum of
12.6 °C.
On the coldest nights of the month, the temperature usually drops to around
-2.5 °C. However, it dropped to
-6.7 °C in November 1993.
On the warmest days of the month, the temperature usually reaches around
21 °C. However, it reached
25.6 °C in November 2010.
Precipitation amounts to
50 mm, distributed over 5 days.
The day lasts on average 9 hours and 40 minutes.
There are on average 4 hours of sunshine per day. So, the sun shines 39% of the time.
The average humidity is 80%. Hence, the air is normally humid.
December is generally a cold month. The average temperature is of
3.7 °C, with a minimum of
0.2 °C and a maximum of
7.2 °C.
On the coldest nights of the month, the temperature usually drops to around
-7.5 °C. However, it dropped to
-13.5 °C in December 1997.
On the warmest days of the month, the temperature usually reaches around
15.5 °C. However, it reached
22 °C in December 2010.
Precipitation amounts to
55 mm, distributed over 6 days.
The day lasts on average 9 hours and 5 minutes. December 21, the winter solstice, is the shortest day of the year in the Northern Hemisphere.
There are on average 3 hours of sunshine per day. So, the sun shines 34% of the time.
The average humidity is 83%. Hence, the air is normally humid.