1.
weather deteriorates
e.g. The weather is likely to deteriorate later on today.
2.
thick/dense fog
patches of fog/mist
a blanket of fog [literary]
fog/mist comes down
[opposite: lifts]
e.g. There is thick fog on the motorway.
There are patches of fog on the east coast but these should lift by midday.
3.
strong sun
[opposite: weak]
e.g. Avoid going on the beach at midday when the sun is strongest.
4.
heavy rain (NOT strong rain)
driving rain
e.g. Road conditions are difficult because of the driving rain.
5.
heavy/fresh/crisp/thick/driving snow
e.g. The snow is lovely and crisp this morning.
注:crisp snow = snow that is fresh and hard
6.
hard frost
[opposite: light]
e.g. There will be a hard frost tonight.
7.
high/strong/light/biting winds
the wind packs up
[opposite: dies down]
the wind blows/whistles
e.g. The wind was light this morning but it's picking up now and will be very strong by the evening.
The wind was whistling through the trees.