Is weed legal in pennsylvania?

Recreational
Illegal; Decriminalized In Philadelphia and Pittsburgh up to 30 g (1.1 oz)
Medical
Legal to possess up to a 90-day supply
Notes
April 17, 2016: medical use law signed by Governor Wolf. Possession of 30 g (1.1 oz) or less up to 30 days in jail and fine up to $500. More than 30g a misdemeanor up to a year in jail and $5000 fine.

Glossary

Possession
In the context of cannabis laws, "possession" refers to having physical control over cannabis products. Laws often specify the amount one can possess, commonly in terms of weight (e.g., ounces, grams). Penalties for possession can range from fines to imprisonment, depending on jurisdiction and the amount possessed.
Decriminalized
Decriminalization means that possession of a small amount of cannabis for personal use is not a criminal offense, but may still be subject to a fine or other administrative penalties. It's a middle ground between full legalization and criminalization. Decriminalization aims to reduce the social and economic costs of enforcing cannabis prohibition, such as arrests and imprisonment.