Natural gas prices are on the rise, as the United States Natural Gas ETF (UNG) - Get Report is up 2% Friday. That may not encourage investors much, as the ETF is still down 4% on the week.

But it's got a lot of investors wondering when stocks like Chesapeake Energy (CHK) - Get Report , Range Resources (RRC) - Get Report and Cabot (CBT) - Get Report will start rallying again. Of the three, Cabot's got the lowest finding costs for natural gas, TheStreet's Jim Cramer, manager of the Action Alerts PLUS portfolio, said on CNBC's "Stop Trading" segment.

These stocks are catching a boost Friday, though, as the weather is playing an effect. You don't really want to base an investment on weather, but in this case, it's helping the group, Cramer said.

Cramer explained that hot weather will cause companies to draw on inventories, which should boost natural gas prices. If it stays hot this summer, investors will wish they had bought these stocks, particularly Chesapeake, because it's the most levered to natural gas prices, he said.

Investors who are looking for a stock with a low valuation and low costs, they should consider Cabot, he concluded. 

Cabot has taken quite the spill, with shares down 14% this month.

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This article is commentary by an independent contributor.