Their annual migration largely depends on the governments of Mexico, Canada, and the United States
Mexico's CONANP has launched a free app for Mexicans to monitor monarch butterflies in all 32 states
The March tempests caused the loss of 133 acres (54 hectares) of pine and fir trees in the forests west of Mexico City, more than four times the amount lost to illegal logging.
Grupo México wants to use a legal loophole to revive mining in the Monarch Butterfly Biosphere Reserve, according to The New York Times.
Mexico's environmental protection agency released photos of patches of frost, snow and ice in parts of the butterfly reserve.
The area covered by the orange-and-black insects in the mountains west of Mexico City this season was more than three and a half times greater than last winter.
Favorable weather conditions at breeding grounds for monarch butterflies in Mexico are expected to help raise their numbers to possibly more than 100 million this year.
Mexican Environment Secretary Rafael Pacchiano said initial reports suggest the butterfly population is rebounding.
Monarch butterflies diverted from their usual route and found refuge in ravines in Nuevo León state in northern Mexico.
The orange-and-black butterflies had been spotted by park rangers entering Coahuila state, on the border with Texas.