The ones that are not too far from the equator, especially the ones a bit south of the equator. Plus, within the country, only places relatively near to sea level will be hot. Up high in the mountains (think Kilamanjaro) it's quite cool, even in mid-summer.
Then there are a few places, such as the Sahara desert, which will be hot in the day but cold at night (in January).
In terms of places on the beaten tourist trail, try:
Australia,
New Zealand (North Island)
Papua New Guinea
Indoneasia
Bali
Malaysia
Maldives
Sri Lanka
Thailand
Cambodia
Vietnam
Lowland India
Ethiopia (away from the mountains, and allowing for cold nights in the deserts)
Kenya
Nigeria
South Africa
Venezuela
Brazil
If you just want somewhere that will have decent weather in January and not too far to travel from Britain, most people are satisfied with the Mediterranean Islands, such as Majorca, Corfu and Malta. Or a bit further afield, Canary Islands and Turkey.
Then there are a few places, such as the Sahara desert, which will be hot in the day but cold at night (in January).
In terms of places on the beaten tourist trail, try:
Australia,
New Zealand (North Island)
Papua New Guinea
Indoneasia
Bali
Malaysia
Maldives
Sri Lanka
Thailand
Cambodia
Vietnam
Lowland India
Ethiopia (away from the mountains, and allowing for cold nights in the deserts)
Kenya
Nigeria
South Africa
Venezuela
Brazil
If you just want somewhere that will have decent weather in January and not too far to travel from Britain, most people are satisfied with the Mediterranean Islands, such as Majorca, Corfu and Malta. Or a bit further afield, Canary Islands and Turkey.