Seasons and Weather, was/were

It ... frosty yesterday.

They .... at school in December.

Ann's winter holidays ... fantastic.

It ... windy in January.

The leaves on the trees .... yellow in November.

It is usually ... in summer.

The weather ... wet in autumn.

It is usually frosty in ...

We ... happy to have winter holidays.

There ... rainy days in September.

I ... not at the farm in July.