It could be considered a Mediterranean climate, warm in the east, which varies losing humidity and gaining temperature as you advance towards the west. As regards to the Pluviometry, it varies from the 800mm. in the east to 500-600mm. in the west. As a limiting factor to take into consideration there exists the risk of spring frosts. The safe periods of frosts are from 6 to 8 months. The average duration of the dry period is from 2-3 months in the eastern area, to 4 months in the western region. The average minimum temperature of the coldest month is from –10,3ºC in the month of January, which is when the plant is in its heart of winter rest. VARIABLE Covarrubias Santo Domingo de Silos Lerma Cilleruelo de Abajo Santamaría del Campo Antigüedad Average annual temperature ºC 8-12 8-12 8-12 10-12 10-12 10-12 Average temp. of coldest month ºC 1-3 0-13 1-4 2-4 2-4 2-4 Average temp. of hottest month ºC 15-23 17-22 16-21 19-23 19-21 19-23 Average duration of no frost periods Months 6-8 6-8 6-8 6-8 8 6-8 Average annual ETP 600-800 600-800 600-800 700-800 700-800 700-800 Average annual rainfall 600-1.000 600-1.000 400-800 400-800 400-550 400-600 Average annual deficit 100-300 150-350 100-350 200-350 250-400 200-350 Average duration of dry period Months 2-3 2-4 2-4 3-4 3-4 3-4 According to J. Papadakis’s classification the climate in the region differs from being winter type classification av/Tv or summer M and a humidity regime ME in the east winter type av, summer M and regime of humidity Me in the west. (av:fresh oat, Tv: wheat-oat. M:corn) winter and summer type (ME: Mediterranean humid, Me: Mediterranean dry) Humidity Regime.