(CNN) During Democratic Sen. Amy Klobuchar's 2020 announcement speech in the midst of a snowstorm in Minneapolis Sunday, President Donald Trump tweeted out a jab toward the senator's statements on global warming.

"Well, it happened again," Trump tweeted , "Amy Klobuchar announced that she is running for President, talking proudly of fighting global warming while standing in a virtual blizzard of snow, ice and freezing temperatures. Bad timing. By the end of her speech she looked like a Snowman(woman)!"

The President has used this sort of rhetoric many, many times during his time in office, suggesting that cold weather somehow disproves the scientific evidence that the planet is warming. But it doesn't quite work that way.

Weather does not equal climate

First of all, Trump is conflating two things: weather and global climate. To put it simply, weather is the day-to-day changes in atmospheric conditions, while climate is the weather over the long run in a particular region. Global climate refers to the planet's entire climate averaged out over time. It's that second piece that has scientists alarmed. The past five years have been the hottest on record, according to NOAA's 2018 global climate report.

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