During summer (June, July and August) the minimum temperature along the highest point of the trek is around 0°c and it is one of the most favorable seasons to trek to EBC but as the monsoon coincides with summer in Nepal you must carry appropriate gears for a pleasant experience.
During winter (December, January and February) the EBC region receives minimum amount of rainfall and heavy snowfall. This season offers most scenic views of the snowcapped mountains. The temperature decreases to -20°c and most of the trekking routes are closed because of heavy snowfall this is why winter trekking to EBC is not very popular.
Autumn (September, October and November) is one of the most favorable seasons to trek to EBC. During this season there is relatively very less chances of rainfall and the temperature is mild and moderate. This temperature offers you warm day and cold night with pleasant trekking temperatures.
During spring (March, April and May) the Everest region looks extremely beautiful with different colors. The Sagarmatha National parks blooms with lush vegetation and the views of rhododendron and pine forest is remarkable. This season is best for nature lovers and photographers. You will have a colorful trekking during spring as everything, mountains, glaciers, villages, forests etc brings out the best color.