| DATA THROUGH 2010 | State | ID | YRS | DEC | JAN | FEB | MAR | D-J-F-M | %Ann | APR | MAY | JUN | JUL | AUG | SEP | OCT | NOV | ANN | ANN' | |
| ALBANY | NY | ALB | 64 | 14.9 | 16.7 | 13.6 | 11.3 | 56.5 | 89% | 2.8 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 3.9 | 63.7 | 63.5 | 0.2 |
| ALLENTOWN | PA | ABE | 64 | 6.4 | 8.8 | 10.0 | 5.9 | 31.1 | 94% | 0.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.3 | 32.8 | 33.2 | -0.4 |
| ASHEVILLE | NC | AVL | 46 | 2.5 | 4.7 | 4.0 | 3.1 | 14.3 | 91% | 0.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.7 | 15.1 | 15.7 | -0.6 |
| ATLANTIC CITY AP | NJ | ACY | 61 | 2.9 | 5.1 | 6.1 | 2.6 | 16.7 | 96% | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 | 16.5 | 17.4 | -0.9 |
| AVOCA | PA | AVP | 44 | 9.0 | 12.1 | 11.1 | 9.1 | 41.3 | 86% | 2.9 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 3.5 | 48.2 | 48.0 | 0.2 |
| BALTIMORE | MD | BWI | 60 | 3.6 | 6.0 | 7.7 | 3.6 | 20.9 | 95% | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.0 | 21.3 | 22.0 | -0.7 |
| BANGOR | ME | BGR | 30 | 14.1 | 18.7 | 15.5 | 11.2 | 59.5 | 88% | 4.5 | 0.05 | 0.0 | 0.0 | 0.0 | 0.05 | 0.1 | 3.3 | 67.5 | 67.5 | 0.0 |
| BINGHAMTON | NY | BGM | 59 | 18.3 | 21.0 | 17.7 | 15.0 | 72.0 | 85% | 4.6 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.8 | 7.3 | 84.9 | 85.0 | -0.1 |
| BLOCK IS. | RI | BID | 27 | 2.9 | 5.1 | 6.3 | 5.7 | 20.0 | 98% | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 20.5 | 20.5 | 0.0 |
| BLUE HILL | MA | MQE | 125 | 11.6 | 15.7 | 15.8 | 11.8 | 54.9 | 90% | 3.3 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 2.8 | 61.2 | 61.3 | -0.1 |
| BOSTON | MA | BOS | 73 | 8.5 | 12.9 | 11.8 | 8.0 | 41.2 | 95% | 0.9 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.3 | 43.4 | 43.4 | 0.0 |
| BRIDGEPORT | CT | BDR | 55 | 5.2 | 7.5 | 8.1 | 4.8 | 25.6 | 95% | 0.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 26.7 | 26.9 | -0.2 |
| BUFFALO | NY | BUF | 67 | 24.5 | 24.5 | 17.8 | 12.5 | 79.3 | 84% | 3.2 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.7 | 10.8 | 94.1 | 94.2 | -0.1 |
| BURLINGTON | VT | BTV | 67 | 19.1 | 19.8 | 17.0 | 13.6 | 69.5 | 86% | 4.0 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 6.5 | 80.1 | 80.4 | -0.3 |
| CAPE HATTERAS | NC | HSE | 38 | 0.6 | 0.4 | 0.5 | 0.4 | 1.9 | 100% | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.9 | 1.9 | 0.0 |
| CARIBOU | ME | CAR | 70 | 23.6 | 24.1 | 22.0 | 19.8 | 89.5 | 80% | 8.3 | 0.8 | 0.0 | 0.0 | 0.0 | 0.0 | 2.0 | 11.6 | 113.1 | 112.2 | 0.9 |
| CHARLOTTE | NC | CLT | 71 | 0.5 | 2.2 | 1.8 | 1.2 | 5.7 | 98% | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 5.8 | 5.8 | 0.0 |
| CONCORD | NH | CON | 69 | 14.4 | 18.2 | 14.4 | 11.6 | 58.6 | 90% | 2.8 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 3.8 | 65.4 | 65.4 | 0.0 |
| ERIE | PA. | ERI | 55 | 24.4 | 25.9 | 16.5 | 12.1 | 78.9 | 85% | 3.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 10.2 | 92.6 | 92.5 | 0.1 |
| GREENSBORO-WINSTON-SALEM | NC | GSO | 82 | 1.4 | 3.6 | 2.5 | 1.7 | 9.2 | 99% | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 9.2 | 9.3 | -0.1 |
| HARRISBURG | PA | CXY | 52 | 6.8 | 9.7 | 9.2 | 6.1 | 31.8 | 93% | 0.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 2.0 | 34.3 | 34.3 | 0.0 |
| HARTFORD | CT | BDL | 53 | 11.0 | 13.1 | 12.3 | 10.0 | 46.4 | 93% | 1.5 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 2.1 | 50.1 | 50.1 | 0.0 |
| ISLIP | NY | ISP | 23 | 5.7 | 7.4 | 7.2 | 5.3 | 25.6 | 93% | 0.9 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.9 | 26.5 | 27.4 | -0.9 |
| LYNCHBURG | VA | LYH | 59 | 3.2 | 5.6 | 5.4 | 3.4 | 17.6 | 95% | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.7 | 18.2 | 18.5 | -0.3 |
| MIDDLETOWN | PA | MDT | 71 | 6.7 | 9.8 | 9.6 | 6.0 | 32.1 | 93% | 0.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 2.0 | 34.4 | 34.7 | -0.3 |
| MT. WASHINGTON | NH | MWN | 78 | 43.0 | 39.9 | 40.5 | 42.8 | 166.2 | 64% | 30.8 | 11.5 | 1.3 | 1.3 | 0.1 | 2.0 | 14.2 | 32.9 | 260.6 | 260.3 | 0.3 |
| NEW YORK (JFK AP) | NY | JFK | 52 | 4.5 | 6.5 | 8.5 | 3.9 | 23.4 | 96% | 0.6 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.3 | 23.8 | 24.3 | -0.5 |
| NEW YORK (LAGUARDIA AP) | NY | LGA | 66 | 5.5 | 6.9 | 9.2 | 4.7 | 26.3 | 96% | 0.7 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 27.2 | 27.5 | -0.3 |
| NEW YORK C.PARK | NY | NYC | 142 | 5.7 | 7.7 | 8.9 | 5.1 | 27.4 | 94% | 0.9 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.9 | 28.9 | 29.2 | -0.3 |
| NEWARK | NJ | EWR | 69 | 6.2 | 7.5 | 9.1 | 4.9 | 27.7 | 95% | 0.8 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 28.5 | 29.1 | -0.6 |
| NORFOLK | VA | ORF | 60 | 1.3 | 3.1 | 2.9 | 1.0 | 8.3 | 100% | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 7.9 | 8.3 | -0.4 |
| PHILADELPHIA | PA | PHL | 68 | 3.8 | 6.0 | 7.7 | 3.5 | 21.0 | 95% | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.7 | 21.2 | 22.0 | -0.8 |
| PITTSBURGH | PA | PIT | 58 | 8.4 | 12.1 | 10.2 | 8.0 | 38.7 | 87% | 1.8 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 | 3.4 | 43.6 | 44.4 | -0.8 |
| PORTLAND | ME | PWM | 70 | 15.1 | 19.1 | 16.4 | 13.1 | 63.7 | 90% | 3.1 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 3.3 | 70.9 | 70.5 | 0.4 |
| PROVIDENCE | RI | PVD | 57 | 7.6 | 9.6 | 9.6 | 7.3 | 34.1 | 94% | 0.7 | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 1.3 | 36.7 | 36.4 | 0.3 |
| RALEIGH | NC | RDU | 66 | 0.9 | 2.8 | 2.6 | 1.3 | 7.6 | 99% | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 7.6 | 7.7 | -0.1 |
| RICHMOND | VA | RIC | 71 | 2.2 | 5.0 | 3.9 | 2.5 | 13.6 | 96% | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.4 | 13.8 | 14.1 | -0.3 |
| ROANOKE | VA | ROA | 56 | 4.2 | 6.7 | 6.8 | 3.5 | 21.2 | 92% | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.5 | 22.9 | 23.1 | -0.2 |
| ROCHESTER | NY | ROC | 70 | 20.8 | 24.8 | 22.2 | 15.4 | 83.2 | 88% | 3.4 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 7.2 | 93.8 | 94.3 | -0.5 |
| SALISBURY | MD | SBY | 30 | 2.1 | 3.7 | 2.7 | 2.1 | 10.7 | 96% | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.0 | 11.1 | 11.1 | 0.0 |
| SYRACUSE | NY | SYR | 61 | 29.2 | 31.6 | 26.7 | 17.9 | 105.4 | 88% | 3.7 | 0.1 | 0.0 | 0.0 | 0.0 | 0.0 | 0.6 | 9.6 | 118.4 | 119.4 | -1.0 |
| WALLOPS ISLAND | VA | WAL | 31 | 2.2 | 2.8 | 3.6 | 0.7 | 9.3 | 96% | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.2 | 8.6 | 9.7 | -1.1 |
| WASHINGTON DULLES AP | VA | IAD | 48 | 3.9 | 7.1 | 8.0 | 3.4 | 22.4 | 93% | 0.4 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 1.2 | 23.3 | 24.0 | -0.7 |
| WASHINGTON NAT'L AP | VA | DCA | 67 | 3.2 | 5.2 | 5.8 | 2.3 | 16.5 | 84% | 2.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.8 | 19.2 | 19.6 | -0.4 |
| WILLIAMSPORT | PA | IPT | 66 | 8.3 | 10.7 | 10.1 | 8.1 | 37.2 | 90% | 1.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 2.8 | 41.5 | 41.3 | 0.2 |
| WILMINGTON | DE | ILG | 60 | 3.7 | 6.6 | 7.2 | 3.3 | 20.8 | 95% | 0.2 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.1 | 0.9 | 21.3 | 22.0 | -0.7 |
| WILMINGTON | NC | ILM | 59 | 0.6 | 0.5 | 0.6 | 0.4 | 2.1 | 100% | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 2.0 | 2.1 | -0.1 |
| WORCESTER | MA | ORH | 48 | 14.0 | 17.1 | 16.8 | 13.8 | 61.7 | 89% | 3.5 | 0.3 | 0.0 | 0.0 | 0.0 | 0.0 | 0.5 | 3.5 | 69.7 | 69.5 | 0.2 |