How much time do you think the wind took off of my 1600m run?

[Runner16x]

I am a female freshman and i had a highschool track meet today. The winds reached probably 15-20 mph during my race. I haven't ran a mile since last year. Last year, I ran a 6:03 but today i ran 6:02. I got first by quite a bit but i was really hoping to break 5 for the first time