Giant Bubble Ideal Conditions
Conditions are a HUGE factor in how large the bubbles get and how long they last. Expectations must be lowered in less than ideal conditions, though it can still be fun.
Ideal Conditions:
Wind:
Ideally, the less wind the better. Even slightly windy days can really hamper giant bubbles and break them into smaller bubbles. I always get the biggest bubbles on days with either no wind or a very slight gentle breeze. Even if all other factors are great, if its extremely windy bubbles may not be great at all.
Humidity:
Humidity is a big factor in how large bubbles can get and how long they can last. The very biggest bubbles are only possible in 90% or higher humidity. Where I live we don't get that kind of humidity, but I still get amazing results in lower and even much lower humidity, but its always most humid in the mornings or evenings, so I aim for those times. Even if its dry, it can still be great fun to make bubbles, even if they're not as impressive.
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I recommend doing giant bubbles the morning after a rain storm, when humidity is likely to be very high.
Temperature/precepitation
Precipitation pops bubbles, and if it's too hot (Above 75 degrees F.) bubbles don't get as big or last as long, though it can still be super fun to make them! If its freezing point or below, bubbles will not last very long at all.