The weather may be hit or miss these days, but there’s no doubt that spring has finally arrived in Boston. Here are five unmistakable signs of the season.

The Swan Boats have returned to the Public Garden pond, as have the swans Romeo and Juliet. Also back home are the ducks, made famous in Robert McCloskey’s classic children’s book, “Make Way for Ducklings.’’ For “Duckling Day’’ on May 14, some 1,000 people dress up as characters from the book and parade from the Boston Common to the Public Garden, led by the Harvard Marching Band.

Hubway bikes are back and ready to take you on your way. Take advantage of the weather by checking out some scenic areas that are off the typical tourist route, such as the Emerald Necklace bike paths. Hubway now has 1,800 bikes at 185 docking stations all around the area, including Cambridge, Brookline, and Somerville.

Nothing says spring like outdoor markets. SoWa Open Market, which bills itself as Boston’s largest celebration of local artists, farmers, chefs, brewers, and musicians, started up for the season April 29. On the first Friday of every month, SoWa’s galleries and restaurants open their doors for “an evening of art, culture, and inspiration.’’

On a less inspiring note, street cleaning has resumed. The rumbling sweepers are a blessing and a curse. On the bright site, parking gets a good bit easier after the mass exodus of college students this month.

The weekend throngs have returned to the Charles River Esplanade. Watch your step as bicyclists, rollerbladers, baby strollers, joggers, and sunbathers compete for space. Not to mention the Hacky Sack players and Frisbee tossers. A piece of advice — head down to one of the docks on the river to watch the sunset. Get there early to grab one of the outrageously comfortable Adirondack chairs and watch the sun dip below the Cambridge skyline.

Maddie Kilgannon can be reached at maddie.kilgannon@globe.com.