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June 2009
North Country Monthly Climate Summary

TEMPERATURE SUMMARY...

TEMPERATUES WERE BELOW AVERAGE ACROSS THE NORTH COUNTRY FOR THE MONTH OF JUNE WITH MOST LOCATIONS AVERAGING 1 TO 2 DEGREES BELOW HISTORICAL NORMS. NIGHTIME LOWS WERE ACTUALLY NEAR NORMAL BUT DAILY HIGH TEMPERATURES WERE RUNNING WELL BELOW AVERAGE ON THE ORDER OF 3 TO 4 DEGREES. THE MAJORITY OF THE MONTH WAS CLOUDY WITH BURLINGTON REPORTING 24 DAYS OUT OF 30 OF EITHER CLOUDY OR PARLTY CLOUDY SKIES. CLOUDY SKIES PREVENTED DAILY MAX TEMPERATURES FROM CLIMBING TO NORMAL LEVELS BUT THE CLOUDS ALSO INSULATED THE REGION ALLOWING FOR WARM NIGHTS. BURLINGTON DID NOT REACH THE 90 DEGREE MARK FOR THE MONTH OF JUNE...WITH THE ONLY LOCATION BREAKING 90 DEGREES BEING MASSENA ON THE 25TH. THE WEATHER PATTERN FOR THE MONTH WAS DOMINATED BY NUMEROUS CUT OFF UPPER LEVEL LOW PRESSURE SYSTEMS. THESE CUT OFF LOW PRESSURE SYSTEMS KEPT A PERSISTENT POOL OF COLD AIR ALOFT OVER THE AREA...ALLOWING FOR GREATER INSTABILITY...THUS GREATER CLOUD COVER. ANOTHER FACTOR THAT LEAD TO COLDER THEN AVERAGE TEMPERATURES FOR THE MONTH WAS THE EASTERLY ONSHORE FLOW OFF THE ATLANTIC OCEAN. THIS ALLOWED FOR A COOL MARINE LAYER TO ADVECT INLAND INTO EASTERN VERMONT...KEEPING THE AREA COOL AND MOIST. THE MARINE LAYER HAD A MUCH GREATER IMPACT TOWARDS COASTAL NEW ENGLAND WHERE AVERAGE TEMPERATURES FOR THE MONTH WERE CLOSE TO 5 DEGREES BELOW NORMAL.

TEMPERATURE STATISTICS ACROSS THE NORTH COUNTRY FOR THE MONTH OF JUNE...

  Burlington Montpelier Massena Saint Johnsbury
Avg. Temp 64.3 61.5 62.7 62.3
Departure -1.3 -1.1 -2.2 -2.3
Highest 87 ON 25 85 ON 25 90 ON 25 85 ON 25
Lowest 38 ON 01 35 ON 01 31 ON 01 36 ON 01

BELOW ARE DAILY TEMPERATURE GRAPHS FOR THE MONTH OF MAY FOR EACH BURLINGTON, MONTPELIER, MASSENA, AND SAINT JOHNSBURY.

PRECIPITATION SUMMARY...

PRECIPITAION FOR THE MONTH OF JUNE WAS HIGHLY VARIABLE ACROSS THE NORTH COUNTRY WITH MOST REGIONS HAVING ABOVE AVERAGE PRECIPITATION BUT SOME AREAS ALSO HAD BELOW AVERAGE PRECIPITATION. RAINFALL WAS ABOVE AVERAGE ACROSS THE NORTHERN ADIRONDACKS REGION...AND THE MAJORITY OF VERMONT...WITH LOCALIZED BELOW AVERAGE RAINFALL AROUND THE SAINT JOHNSBURY AREA...AND ACROSS THE SAINT LAWRENCE VALLEY OF NEW YORK. RAINFALL AMOUNTS RANGED FROM A LOW OF 1.67 INCHES ACROSS WESTERN SAINT LAWRENCE COUNTY TO 7.41 INCHES AT JAY PEAK. BURLINGTON WAS WELL ABOVE AVERAGE FOR THE MONTH WITH A SURPLUS OF +1.82 INCHES...WHICH PUT THE YEARLY SURPLUS SINCE JAN 1ST AT +1.99 INCHES. RAINFALL WAS OBSERVED AT BURLINGTON ON 15 OUT OF 30 DAYS...WITH THE GREATEST 24 HOUR RAINFALL OF 1.29 INCHES.

PRECIPITATION STATISTICS ACROSS THE NORTH COUNTRY FOR THE MONTH OF JUNE...

  Burlington Montpelier Massena Saint Johnsbury
Monthly Total " 5.25 3.86 2.79 3.42
Departure +1.82 +0.38 -0.49 -0.46
Greatest 24hr 1.29 ON 11-12 1.49 ON 29 1.00 ON 26-27 1.28 ON 28-29
SNOW/SLEET
Monthly Total " 0 0 0 0
Departure 0 0 0 0
Greatest 24hr 0 0 0 0

BURLINGTON FORECAST AREA ACCUMULATED MONTHLY RAIN GAUGE PRECIPITATION (IN INCHES) FOR THE MONTH OF JUNE (CLICK ON THE GRAPH FOR A LARGER VERSION).

MONTHLY WEATHER PATTERNS AND GLOBAL CLIMATE DRIVERS...

THE TREND OF JUNE UPPER LEVEL CUT OFF LOWS CONTINUES ACROSS THE NORTHEAST...WITH SIMILAR WEATHER PATTERNS ESTABLISHING THEMSELVES DURING BOTH 2007 AND 2008. THE MEAN TROUGH WAS PERSISTENTLY LOCATED OVER THE EASTERN CONUS...WITH RIDGING CENTERED OVER THE SOUTHERN CENTRAL PLAINS...AND OVER THE NORTH ATLANTIC. THE NORTH ATLANTIC RIDGING WAS RESPONSBILE FOR THE BLOCKING PATTERN THE DEVELOPED OVER THE NORTHEAST CONUS. THE BLOCKING PATTERN ALLOWED AREAS OF LOW PRESSURE TRACKING ACROSS THE MID-WEST TO SLOW DOWN AND EVENTUALLY CUT OFF OVER THE REGION. COOL...DAMP...AND CLOUDY CONDITIONS WAS THE RESULT OF THIS WEATHER PATTERN WITH BELOW AVERAGE TEMPERATURES AND ABOVE AVERAGE RAINFALL THROUGHOUT THE NORTHEAST U.S.

THE CLIMATE PREDICTION CENTER IS FORECASTING A 40% CHANCE FOR ABOVE NORMAL PRECIPITATION AND A 40% CHANCE FOR BELOW AVERAGE TEMPERATURES DURING THE MONTH OF JULY. IF THE LONG RANGE OUTLOOK IS CORRECT...EXPECT SIMILAR WEATHER CONDITIONS IN JULY AS WE EXPERIENCED IN JUNE.

OUT IN THE TROPICAL PACIFIC OCEAN THE EL NINO SOUTHERN OSCILLATION (ENSO) HAS BEGUN TO SHIFT TO ITS POSITIVE MODE...COMMONLY KNOWN AS EL NINO. THE ENSO CYCLE HAS BEEN DOMINATED BY EITHER ENSO NEUTRAL OR LA NINA CONDITIONS DURING THE PAST 2 YEARS WITH THE LAST EL NINO EPISODE OCCURING IN JANUARY OF 2007. IT WILL BE MONTHS BEFORE OFFICIAL EL NINO CRITERIA ARE MEANT...BUT PACIFIC WATER ANAMOLIES ARE ABOVE AVERAGE AND ARE FORECASTED TO RUN ABOVE AVERAGE INTO THE FALL.

CLIMATE PREDICTION CENTER JULY 2009 PRECIPITATION OUTLOOK...

CLIMATE PREDICITION CENTER JULY 2009 TEMPERATURE OUTLOOK...



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