The telephone area code is 916. As for the climate, Palenque's high humidity is downright oppressive in the summer, especially after rain showers. During the winter, the damp air can occasionally be chilly in the evening. Rain gear is handy at any time of year. Internet service and ATMs are easily available.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.