CNBC's Jim Cramer said Tuesday that he believes that Wall Street's recent optimism over an apparent slowdown in coronavirus cases is not shared by many Americans on Main Street.

"There is a happy days are here again Wall Street impression versus what I hear ... people saying, 'Can I get a mask? How do I get a mask? Do I want an N95?'" Cramer said on "Squawk on the Street."

Cramer's comments came ahead of Tuesday's opening bell, as U.S. stock futures were indicating a strong jump, one day after the Dow Jones Industrial Average gained more than 1,600 points or 7.7%.

The Dow was up more than 900 points at one point Tuesday morning before giving back a bulk of those gains. As of Monday's close, blue chips were still in a bear market as defined by declines of at least 20% from recent 52-week highs. The Dow closed at a record high in February.

Investors are responding to an apparent slowdown in new U.S. cases of COVID-19 and optimistic comments from politicians such as President Donald Trump. On Monday evening Trump said there was "tremendous light at the end of the tunnel," and spoke positively about the development of therapeutics.

Citing recent COVID-19 case data, JPMorgan's Marko Kolanovic recently told clients that a "limited reopening" of the U.S. economy could happen soon.