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Climate of Bilbao

Bilbao
Climate chart ()
J F M A M J J A S O N D
 
 
126
 
 
13
5
 
 
97
 
 
15
5
 
 
94
 
 
16
6
 
 
124
 
 
17
7
 
 
90
 
 
20
10
 
 
64
 
 
23
13
 
 
62
 
 
25
15
 
 
82
 
 
26
15
 
 
74
 
 
24
13
 
 
121
 
 
21
11
 
 
141
 
 
16
8
 
 
116
 
 
14
6
Average max. and min. temperatures in °C
Precipitation totals in mm
Source: WMO
J F M A M J J A S O N D
 
 
126
 
 
13
5
 
 
97
 
 
15
5
 
 
94
 
 
16
6
 
 
124
 
 
17
7
 
 
90
 
 
20
10
 
 
64
 
 
23
13
 
 
62
 
 
25
15
 
 
82
 
 
26
15
 
 
74
 
 
24
13
 
 
121
 
 
21
11
 
 
141
 
 
16
8
 
 
116
 
 
14
6
Average max. and min. temperatures in °C
Precipitation totals in mm
Source: WMO
Yearly max temp Yearly mean temp Yearly min temp
19.1 °C 14.3 °C 9.4 °C

Bilbao and its metropolitan area has an oceanic climate according to the Köppen climate classification ( Cfb) with mild winters and warm summers. According to the Troll-Paffen climate classification, Bilbao has a temperate climate and according to the Siegmund/Frankenberg climate classification, Bilbao has a subtropical climate. According to the European Environment Agency, Bilbao lies within the Atlantic biogeographical region. The climate of Bilbao and the rest of the north-western part of Spain (the so-called Green Spain) is different from the rest of the country, characterized by a higher amount of rainfall and precipitation days, fewer sunshine hours and mild temperatures, in summer comparable to northern half of Europe with temperate climate.

Said proximity to the ocean also makes that the two most defined seasons (summer and winter) remain mild, with low intensity thermal oscillations. Its average annual temperature is 19.1 °C during the day and 9.4 °C at night. In the coldest month – January, typically the temperature is around 13-14 °C during the day and 5 °C at night. In the warmest month – August, the typically temperature is around 25-26 °C during the day and about 15 °C at night.

Bilbao has on average 128 precipitation days a year, therein average few to dozen rainy days per month (≥ 1 mm), ranging from 7 in July to 13 in January. The average annual precipitation is 1195 mm, ranging from 62 mm in July to 141 mm in November. This is one of the highest results in Spain, like the rest of Green Spain and Bay of Biscay area. Precipitation in the region is abundant, and given the latitude and atmospheric dynamics, rainy days represent 45% and cloudy days 40% of the annual total.

Average relative humidity is 72%, ranging from 70% in February and March to 74% in August and November.

Snow is not frequent in the city, while it is possible to see snow on the top of the surrounding mountains. City recorded to few snow days per year. In February 1956 reported record: 7 of snow days in the month.Sleet is more frequent, about 10 days per year, mainly in the winter months.


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