Winter Weather
Winter Weather Products | Experimental Products | Wind Chill Information
El Niño and La Niña Effects on Philadelphia Winters | Terminology & Statement Criteria
Previous Winters | Winter Weather Awareness
Winter Weather Products

Climate Prediction Center (CPC)

Current Winter Storm Watches, Warnings and Advisories

Local Products

Other Products

Experimental Products
Wind Chill Information

New Wind Chill Chart

On November 1, 2001, the National Weather Service (NWS) implemented a replacement Wind Chill Temperature (WCT) index for the 2001/2002 winter season. The new WCT index:

El Niño and La Niña Effects on Philadelphia Winters
SNOWFALL BY ENSO STATE
1949-50 THROUGH 2009-2010 WINTER
AVG 21.9
STRONG NINA - 6 WINTERS 15.9
MODERATE NINA - 7 WINTERS 13.8
WEAK NINA - 7 WINTERS 23.1
ENSO NEUTRAL - 22 WINTERS 22
WEAK NINO - 5 WINTERS 28.1
MODERATE NINO - 8 WINTERS 24.3
STRONG NINO - 6 WINTERS 27
NUMBER OF SIGNIFICANT SNOWFALL EVENTS
AT PHL BY ENSO STATE
>/= 6" >/= 10"
STRONG NINA - 6 WINTERS 3 0
MODERATE NINA - 7 WINTERS 1 0
WEAK NINA - 7 WINTERS 4 1
ENSO NEUTRAL - 22 WINTERS 21 8
WEAK NINO - 5 WINTERS 5 3
MODERATE NINO - 8 WINTERS 8 1
STRONG NINO - 6 WINTERS 8 6
Typical La Nina conditions
Terminology & Watch/Warning/Advisory Criteria
Criteria Maps for Watches and Warnings
12 Hour Snow
Mt. Holly County Warning Area Eastern Region
24 Hour Snow
Mt. Holly County Warning Area Eastern Region
Freezing Rain
Mt. Holly County Warning Area Eastern Region
Wind Chill
Mt. Holly County Warning Area Eastern Region
Criteria Maps for Advisories
12 Hour Snow
Mt. Holly County Warning Area Eastern Region
Freezing Rain
Mt. Holly County Warning Area Eastern Region
Wind Chill
Mt. Holly County Warning Area Eastern Region
Gradient high wind outlooks, watches, warnings, and wind advisories shall be issued using the following wind speed values
Product Type Sustained Wind ( 1 Hr) Any duration gust
High Wind Outlook >= 40 MPH (35 KTS) >= 58 MPH (50 KTS)
High Wind Watch >= 40 MPH (35 KTS) >= 58 MPH (50 KTS)
High Wind Warning >= 40 MPH (35 KTS) >= 58 MPH (50 KTS)
Wind Advisory (land) 31-39 MPH (27-34 KTS) 46-57 MPH (40-49 KTS)
Wind Advisory for area lakes 25-30 MPH (22-26 KTS) 40-45 MPH (35-39 KTS)
Previous Winters

Seasonal Snowfall Totals (through last winter) for:

Top Snowstorms for Philadelphia (unofficial):

  1. 30.7" on January 7-8, 1996
  2. 21.3" on February 11-2, 1983
  3. 21.0" on December 25-26, 1909
  4. 19.4" on April 3-4, 1915
  5. 18.9" on February 12-14, 1899
  6. 16.7" on January 22-24, 1935
  7. 15.1" on February 28-March 1, 1941

Storm Archives

Winter Weather Awareness and Safety