I bike for work and I've taken a few days off for the holidays. It's been very cold and rainy and Ive tried to keep my bike covered. I hopped on my bike after about a week and a half of disuse, and I began pedaling. With each pedal rotation it seemed like I was going over a small speed bump with my front tire. I tried pedaling faster and slower but the bumping sped and slowed down respectively. Also whenever I used my handbrake I'd smell this weird almost burning smell.
Burning smell? Stop riding the bike immediately!
Inspect your bike closely and identify what is rubbing. I'd suspect the brake pads, or possibly a tyre is rubbing on a part of the frame.
Another cause that exacerbates a burning smell is animal urine on the brakes. Leaving your bike outside means it could be used as a toilet target.
Also look closely at your front tyre. Spin the wheel and see if there is a flat spot in the tyre, or if the rim is damaged. Also look for rocks/pebbles stuck in the tread. Check your tyre pressures too - if they're low that won't help.
I wonder if your bike has been out in the super cold for a bit longer than you realise. Even leaving it covered, the bike will deteriorate fast. Consider parking the bike inside a house or garage instead. Under a porch or carport roof is better than out in the open.