With snow falling throughout, Daniel Lopez swept the Shots ahead from close range in the second minute but Chris Hackett levelled from the spot before Clarke Carlisle headed the Cobblers in front. It was enough to secure Northampton only their third away win this season, and Boothroyd knows his side need to keep taking points away from Sixfields.
"This was a step in the right direction but we have to keep improving our away form," said Boothroyd.
"I just think we've let ourselves down away from home. Five of our next six games our away so we'll need to step it up. This was a great victory for us in difficult conditions. But nothing gets won in the winter. It's all about the last day, that's when the prizes are given out.
"We've got a long way to go and we're nowhere near as good as we can be, but I thought we deserved it. We took our chances but we maybe should have got another goal
"I've played games on icy pitches before and in foreign countries when the heat is stifling, but never with so much snow on the pitch. But the players got on with it."
Shots boss Dean Holdsworth admits his side need to cut out the silly mistakes.
"You can't give away goals cheaply like that - it was a reminder we have to do the basics well," said Holdsworth. "Their goals came from a handball and a set-piece. I thought we were unlucky to go in trailing at half-time but we have to eradicate those errors.
"The conditions were tough for the players but they weren't good for either side. It's very difficult to judge performances in a game like that. We got beaten but I'm trying not to be too critical. You couldn't see the best of the players or the potential we have.
"Adam set Dani Lopez up nicely for his goal. He knows where the net is. If that's his last performance we'll thank him and look to replace him. I've made my offer to Stevenage with regards to keeping him on loan, but they're entitled to take him back."