The FAA makes all pilot know that any time it is between 30-70 degrees F carb icing is possible. It doesn't happen below that, because the moisture in the air is already frozen. Airplanes without fuel injection have a carb heat lever inside. Pulling this moves a valve in the air cleaner box. Air is no longer pulled through the filter, but from a riser surrounding the exhaust manifold. It results in about a 100-300 RPM drop in performance. Anytime you plan on reducing power to idle you should put on the carb heat and leave it on until full power has been reestablished, like when landing and then talking off again.
Glad you are doing good Jon.
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