The climate in USA varies across different parts of the country. Generally, the western and southern parts of US have warmer weather as compared to the eastern and northern parts. The eastern/northern parts of US experience harsh winters with heavy snowfall but the summers are pleasant. The western/southern part has extremely hot summers and comparatively tolerable winters. Find out where you are likely to stay in the US and plan accordingly.
USA can be divided into six climate regions, excluding Alaska, Hawaii and outlying territories. The climate varies considerably between different regions.

  • Northwest Pacific
  • Mid/South Pacific
  • Midwest
  • Northeast
  • Southeast
  • Southwest

Northwest Pacific:

(Includes states like Oregon and Washington to the crest of the Cascade Mountains)

This is the perhaps the wettest part of the country. There are scattered rain showers all year round. Temperatures are mild averaging around 40 degree F. (32.2 degree C). The summer months are pleasantly warmer but never too hot. You can see fogs along the coast during the warmer weather but the fog is less dense during mid-day.
Warm clothes: You will need extra warm clothes for winters like leather jackets, thermal jackets, warm inners, leather gloves etc.

Mid/South Pacific Rockies:

(Includes states like California, Idaho, Montana, Wyoming, Colorado, Utah and Nevada)

These states have generally dry and delightful summers.
California has excellent weather all the year round, with the northern part of the state somewhat cooler (quiet chilly in the winter but seldom freezing). There are very few places in California that experience snow, and the state is known for its nice weather. Mostly all the cities have tolerable winters.
The winter months in the other states like Montana, Idaho and Wyoming can be very cold, with temperatures dropping well below 0 degree F. Colorado, Utah and Nevada are known for their excellent skiing.
Warm clothes: For California you will need warm clothes for winters. For the rest of the Mid-South Pacific region you will need warmer apparel.

Midwest

(Includes states like Dakotas, Kansas, Illinois, Iowa, Minnesota, Wisconsin, Michigan, and Indiana)

This region is moderately dry. Precipitation occurs mainly in late spring and early summer. Summers are pleasant but winter time can be harsh, with lots of snow and heavy chilly winds. Extremes within the Midwest can drop down to -50 degree F.
Warm clothes: You will need extra warm clothes for winters like leather jackets, thermal jackets, warm inners, leather gloves etc.

Northeast

(Includes states like Ohio, Pennsylvania, Washington DC, Maryland).

This entire area is moderately rainy. In winter, the region experiences heavy snow and freezing rain. Summers are usually pleasant, sunny and warm. The fall is especially beautiful in wooded areas.
Warm clothes: You will need extra warm clothes for leather jackets, thermal jackets, warm inners, leather gloves etc.

Southeast

(Includes states like portions of Arkansas and Louisiana, Kentucky, West Virginia, Virginia)

Like the Northeast, this entire area experiences moderate rains fairly evenly throughout the year. The Spring, Summer and Fall seasons are all very pleasant. Some snow and freezing rain falls in winter but for the most part, the winters are quite mild and short lived.
Southern Florida, like California, usually has excellent weather all the year round.
Warm clothes: You will need moderate warm clothes for winters, but may need the extra warm ones for the cold weather that lasts for a very short duration of time.

Southwest

(Includes states like Arizona, New Mexico, Texas, Oklahoma and western portions of Arkansas and Louisiana)

This is the hottest and high rainfall region of the US. You must be prepared to face heavy rains accompanied with thunder storms, dangerous lightening and occasional tornadoes. The winters are generally short but some freezing rains do occur. The spring and fall seasons are quite long and temperatures are generally excellent. The summers are very hot with temperatures approaching and exceeding 100 degree F on many days.
Warm clothes: You will need moderate warm clothes for winters. Raincoats are a must.