See the annual Perseid meteor shower 12th Aug

Freedom meteors are entering the earths atmosphere at a rate of about 100million a day the average size is about 0.0005"dia and most cannot be seen,the earth passes through about 10 well known meteor showers in its annual cycle around the sun just having passed through a significant shower the Perseids,as Woo points out there are some more significant ones on the way but on any dark moonless clear night away from street lights if you lay on your back and scanned the sky you would see about 10 per hour on average.The names of the showers are usually the area of sky they radiate from so a good sky map will show you the constellations and were to look.