Himachal Pradesh has a varied topography and its rugged terrain ranges from an altitude of 450 meters above sea level to an altitude of 6500 meters above sea level. Thus, climate in Himachal is also varied. The diverse topography results in extremes of temperature, sometimes even in the diurnal range of temperature. However, its location near the mountainous ranges lends it a favorable weather and climate. The days are quite pleasant while the nights are usually chilly. The best time to visit Himachal is during spring season that extends from mid-Feb to mid-April. At this time, the climate is pleasant, comfortable and mild.
The lower regions in the southern Himachal that range between altitudes
of 450 to 900 meters above sea level have sub-humid tropical climate.
The regions that lie within 900 to 1800 meters above sea level have warm
temperate climate while regions that lie between 1900 to 2400 meters
above sea level have cool temperate climate. High mountain regions on
the north and east of Himachal have an altitude of 2400 to 4800 meters
above sea level and have cold alpine and glacial climate.
Himachal Pradesh has summers that extend from March to June. Most
regions of Himachal Pradesh experience high temperature ranges, with the
exception of the regions located in high altitudes. There may be
occasional showers but otherwise, the temperature usually remains high.
There may be rains at the end of June and the whole scenery comes alive
with the downpour. Springs and streams swell with water once again. But
the heavy rains in July and August are dangerous too as they are known
to cause floods, landslides and erosions. Dharamsala receives the
highest rainfall in Himachal (about 3400 mm) and Spiti receives the
least in the entire state (below 50 mm).
Winters are cold and there is heavy snowfall from December to March in
areas that are situated at an altitude of 3000 m and above. The regions
that are at an altitude above 4500 m have snow all the year round. The
temperatures can drop bone-numbingly low and if you are planning to
visit Himachal Pradesh at this time, it is advisable to bring sufficient
amount of woolens.