The days are getting warmer, which can only mean one thing: it's time to stay indoors and play lots of cheap games on Steam. Valve's digital PC game store just kicked off its annual summer sale, and it includes some great deals on both new and classic titles.

You can get the fantastic reboot of Doom for 40 percent off, for instance, while the sprawling post-apocalyptic world of Fallout 4 is now half price. It's also a great time to dig into some series you may have skipped, with some big franchise sales: you can get a bundle of every Deus Ex game for 75 percent off, or between 50 and 67 percent off Call of Duty games. You can also get plenty of indie games for just a few bucks; the brutal Hotline Miami 2 is 75 percent off, while cult hit farming game Stardew Valley is 20 percent cheaper than usual.

The sales run until July 4th — and there doesn't appear to be any daily deals as in years past — so you have plenty of time to dig for the best sales.

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