既是可数也是不可数，具体要看实际表达的意思。climate当气候讲时，可以作可数名词，也可以作不可数名词。climate指某一地区常年的气候情况，包括气温、降雨量。还可用作比喻。
Climate的例句
Britain has a temperate climate.
英国气候温和。
The climate affected his health.
气候影响了他的健康。
The climate here is rigorous.
这里的天气很严酷。
The climate is very pleasant.
气候非常宜人。
The climate moulded his character.
气候影响了他的性格。
The economic climate remains uncertain.
经济气候依然是不确定。
Climate change is a fact.
气候变化已成为事实。
The climate there is tropical.
那里是热带气候。
Perhaps he is a climate sceptic.
或许他是一名气候变化怀疑论者。