The worst time to visit Buenos Aires is from December to February. The city is hot and humid, and the crowds are thick.

Avoid visiting Bangkok between March and May due to the hot and humid weather. The city is also crowded during this time, as many tourists flock to Thailand for the summer holidays.

The worst time to visit Sri Lanka is during the monsoon season, which runs from May to September. During this time, the weather is hot and humid, with frequent rainfall.

Zanzibar is best visited between June and October, when the weather is drier and cooler. The rainy season runs from November to April, and the hottest months are January and February.

Mid-February to Mid-December due to heavy rains, thunderstorms, and thick fog, which can obscure views of the falls

Avoid visiting Toronto in the winter as it is the coldest and snowiest time of year.

The worst time to visit France is in August. It is the peak tourist season, so prices are high and crowds are large. Also, many businesses and attractions are closed for vacation.

The worst time to visit Denmark is during the winter months from December to February. The weather is cold and wet, and there is a risk of snow and ice.

Avoid visiting during rainy season (December-April), as the trails are muddy and visibility is low.

Avoid visiting California in the summer, when temperatures can reach 100 °F (37.8 °C) or higher, and wildfires are a frequent occurrence.

Hurricane season runs from June to November, so avoid Cozumel during these months.

Avoid visiting Chicago in the winter, as it is the coldest time of year with below-freezing temperatures and heavy snowfall.

Hurricane season (June to November) is considered the worst time to visit Cabo.

July to August is the hottest and most crowded time to visit Barcelona, with average temperatures of 28ºC and above.

Avoid visiting Tennessee during June to August due to the high temperatures, humidity, and thunderstorms.

July to August, when the humidity is high and the temperatures can reach 35 °C (95 °F).

Hurricane season (June to November) is the worst time to visit Puerto Vallarta due to the risk of tropical storms and hurricanes.

Late July to early September due to extreme heat, high tourist traffic, and thunderstorms.

July and August are the hottest and most humid months in Houston, making them the worst time to visit.

July and August are the worst times to visit Key Largo due to the heat, humidity, and crowds.