Honey bees are able to remember, with accuracy, the time and location of a food source. Foragers continue to visit the location for several days after the food source is depleted, though in decreasing numbers with the passage of time, much like extinction of a conditioned response. We have observed that when rain occurs on an unrewarded test day, a greater than expected number of foragers will arrive at the unrewarded food source on the following day, suggesting that the rain event somehow prolongs the foragers’ time-memory. What factors associated with rain cause a change in the foraging time-memory behavior of the honey bee? We tested two hypotheses. First, the Memory Interference Hypothesis states that rain causes a reduction in overall hive activity as a consequence of a decline in foraging arrivals and departures, recruitment dances, nectar and pollen receiving behaviors, food storage behaviors, etc. This diminution in overall hive activity should therefore reduce inter-individual interactions with the forager bee subpopulation, thereby allowing the time-memory to persist. Second, the Nectar Regeneration Hypothesis proposes that, over evolutionary time, the presence of rain itself has become an adaptive cue to revisit previously profitable food sources. Accordingly, on the day following a significant rain event, many flowers should display an increase in nectar profitability (increases in sugar concentration and/or total nectar).