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We report the rate of cosmic ray air showers with multiplicities exceeding 15muon tracks recorded in the NOvA Far Detector between May 2016 and May 2018.The detector is located on the surface under an overburden of 3.6 meters waterequivalent. We observe a seasonal dependence in the rate of multiple-muonshowers, which varies in magnitude with multiplicity and zenith angle. Duringthis period, the effective atmospheric temperature and surface pressure rangedbetween 210 K to 230 K and 940mbar to 990mbar, respectively; the shower ratesare anti-correlated with the variation in the effective temperature. Thevariations are about 30% larger for the highest multiplicities than the lowestmultiplicities and 20% larger for showers near the horizon than verticalshowers.

Seasonal Variation of Multiple-Muon Cosmic Ray Air Showers Observed in the NOvA Detector on the Surface