The temperature in Venezuela is mostly determined by the elevation and other geographical factors, and not by "season" as in the Northern Hemisphere. The only two seasons that exist are the dry (Dec.-April) and rainy seasons (May- Nov.) During the rainy season most mornings are usually sunny or at least dry, since rains don't start until the afternoon or during the night (normal).
Temperatures don't vary much during these seasons, and are usually as follows: 70 degrees F. In the Central region, low 80's near the Caribbean, and high 80's in the Southern lowlands. The coolest temperatures have been recorded in Meridas; highest mountain at low 40 degrees F.
The hottest months in all of the country are May and August, while the coolest are December and January, when there's also a large contrast between daily and nightly temperatures. The amount of rain also varies in different regions, with the Atlantic coastline being the most humid and the Southern lowlands being the driest. The average rainfall in the country is 150 inches per year.