How does weather effect how much salt there is in the Huson River?

I’m doing a science project and I need to know why there is salt in the Hudson River, in other words, what causes it? I think it has something to do with weather, and depending on how hot or cold the weather is, there is more or less salt in the Hudson River. I need to know how weather causes this. If anyone knows anything, please tell me. A website would be good too! Thanks!
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The Indians had another name for it:

Muhheakantuck – means "great waters in constant motion" or, more loosely, "river that flows two ways." It highlights the fact that this waterway is more than a river – it is a tidal estuary, an arm of the sea where salty sea water meets fresh water running off the land.

How is the weather in Toronto during March?

I’m planning to through a party in Toronto during March, so I would like to know what will the weather be like?

In Toronto during March the average weather is as follows:
5 degrees Celsius high -2 degrees Celsius low
In a month 8 days rain , 6 days snow , 3cm of snow on ground .
Average wind speed 17 km/hr.
Have a good party .

How can some people say they prefer cold weather over warm weather?

They say you can do can a lot more in cold weather than in warm/hot weather.How can this be possible? What the hell can you do in cold weather?

I think it’s what you’ve been climatized to..what weather you’re more use to. I moved from the mountains of north carolina to missori and couldnt stand the humid 100 degree summers. Now, after 6 years the cold is driving me crazy and I’m starting to miss summer lol