Antartide. Temperature Mensili Dicembre 2012

Monthly Climate Summary for December 2012

South Pole Station, Antarctica

 Temperature:

Average temp............ -25.3°C / -13.5°F

 Departure from normal...  +2.5°C /  +4.5°F

 Maximum temp............ -21.1°C /  -6.0°F on day 25

Minimum temp............ -29.8°C / -21.6°F on days 01 and 17

Wind:

Average wind speed.......... 8.9 mph or 7.7 knots

 Prevailing wind direction... Grid Northeast or 030 degrees

Maximum wind speed.......... 28 mph or 24 knots on days 03 and 21

Maximum wind direction...... Grid Northeast

Average vectored wind....... 043 degrees at 5.3 knots

Station Pressure:

Average pressure........ 690.0 mb or 20.376 in. Hg

Departure from normal...  +1.9 mb or +0.056 in. Hg

Highest pressure........ 701.5 mb or 20.715 in. Hg on day 26

Lowest pressure......... 684.5 mb or 20.213 in. Hg on days 01, 02, and 17

Physio-altitude:

Average Physio-alt = 10253 ft / 3125 m

Highest Physio-alt = 10459 ft / 3188 m on days 01, 02, and 17

 Lowest Physio-alt  =  9827 ft / 2995 m on day 26

Sky Cover:

Average cloud cover (8ths)... 04

Days clear................... 07

Days partly cloudy........... 18

Days cloudy.................. 06

Sunshine:

Sunset on 23 March 2013

Average hours per day... 18.6

Percent of possible..... 78

Visibility... 1 day with a visibility of 1/4 mile or less.

Snowfall..... Trace; average net change at snow stakes +0.385 inches.

Balloon flight data:

Number of soundings for the month... 62

Average height of sounding.......... 26.8 mb or 25265 meters above msl

Highest sounding.................... 10.2 mb or 31848 meters above msl

                                     on the day 28 /00Z sounding

 Remarks:

00 soundings were missed.

61 soundings were terminated above 50 mb.

01 soundings were terminated between 50 and 100 mb.

00 soundings were terminated below 100 mb.

**RECORDS**

December 7th: The average daily wind speed of 2.8 kts/3.3 mph broke the previous lowest average daily wind speed record of 3.6 kts/4.1 mph set in 1997.

Prepared by: Timothy Markle/ Phillip Marzette/ Jeremiah Jolliff

Meteorology Department

Amundsen-Scott South Pole Station, Antarctica

720-568-1810 (satellite dependent)

720-568-1809 (satellite dependent)

X61810, X61809 (on-station)

Pol-Met@usap.gov

 (a cura di Alberto Marenga)