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April 2010
North Country Monthly Climate Summary

TEMPERATURE SUMMARY...

THE MILD CONDITIONS OF MARCH CONTINUED INTO THE FIRST PART OF APRIL ACROSS THE NORTH COUNTRY. IN FACT, NUMEROUS DAILY RECORD HIGH TEMPERATURES WERE SET ACROSS THE REGION ON APRIL 2ND, 3RD, 6TH, AND 7TH. THE WARMEST READINGS CAME ON THE 3RD, WHEN THE TEMPERATURE TOPPED OUT AT 82 DEGREES IN BURLINGTON, 84 DEGREES IN MONTPELIER, 83 DEGREES AT SAINT JOHNSBURY, 69 ON MOUNT MANSFIELD, AND 85 IN MASSENA. ALL OF THESE WERE NEW RECORD MAXIMUM TEMPERATURES FOR THE DATE. DAILY AVERAGE TEMPERATURES RAN SOME 10 TO 30 DEGREES ABOVE NORMAL THROUGH THE FIRST WEEK OF THE MONTH. THEREAFTER, CONDITIONS COOLED A BIT, RUNNING NEAR OR JUST ABOVE SEASONAL NORMALS. THE COLDEST PART OF THE PERIOD WAS AT THE END OF THE MONTH, ESPECIALLY ON THE 28TH, WHEN MANY LOCATIONS STRUGGLED TO GET OUT OF THE 40S.

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

  Burlington Montpelier Massena Saint Johnsbury
Avg. Temp 49.2 48.2 49.0 46.8
Departure +5.8 +6.6 +5.8 +3.3
Highest 82 ON 3RD 84 ON 3RD 85 ON 3RD 83 ON 3RD
Lowest 28 ON 14TH 26 ON 14TH 28 ON 13TH, 23RD 26 ON 14TH

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

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PRECIPITATION SUMMARY...

THE TOTAL PRECIPITATION FOR THE MONTH OF APRIL WAS A STORY OF LOCATION, LOCATION, LOCATION. THOSE PLACES EAST OF LAKE CHAMPLAIN AND ALONG AND WEST OF THE GREEN MOUNTAINS SAW PLENTY OF LIQUID PRECIPITATION, GENERALLY 3 TO 5 INCHES WITH ISOLATED HIGHER AMOUNTS. MEANWHILE, EAST OF THE GREENS IN SOUTHEAST VERMONT, AND WEST OF LAKE CHAMPLAIN IN NEW YORK, TOTALS WERE LOWER AND MAINLY IN THE 1 TO 3 INCH RANGE. THE SAINT LAWRENCE RIVER VALLEY WAS PARTICULARLY DRY, WITH MASSENA ONCE AGAIN REPORTING A MONTHLY TOTAL MORE THAN AN INCH BELOW NORMAL. THE PRECIPITATION FELL IN THREE SEPARATE EVENTS, OF WHICH THE SECOND AND THIRD WERE MOST NOTABLE, AS THEY PRODUCED THE HEAVIEST RAINFALL. IN BOTH OF THESE EVENTS, THE NORTHERN PORTIONS OF VERMONT SAW MORE PRECIPITATION THAN OTHER AREAS, ESPECIALLY THE SAINT LAWRENCE RIVER VALLEY. THIS IS ESPECIALLY TRUE DURING THE THIRD EVENT, WHICH OCCURRED ON THE 26TH THROUGH 28TH OF THE MONTH. DURING THIS PERIOD, THE WESTERN SLOPES OF THE NORTHERN GREEN MOUNTAINS AND THE NORTHERN ADIRONDACKS SAW OVER 1.5 FEET OF HEAVY WET SNOW, WITH SOME AREAS RECEIVING NEARLY 2 FEET. THIS MELTED DOWN TO 1.5 TO 2.5 INCHES OF LIQUID. DAILY SNOWFALL RECORDS WERE BROKEN AT BURLINGTON ON THE 27TH AND 28TH, WITH 2.8 INCHES AND 2.7 INCHES, RESPECTIVELY. OTHER THAN THIS LATE-MONTH EVENT...SNOWFALL ACROSS THE NORTH COUNTRY DURING THE MONTH OF APRIL WAS SCARCE. SOME LOCATIONS IN THE HIGHER ELEVATIONS REPORTED 0.5 TO 1.5 INCHES ON THE 9TH THROUGH 10TH, BUT NOTHING MORE THAN THAT.

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

  Burlington Montpelier Massena Saint Johnsbury
Monthly Total " 3.08 3.04 1.27 4.00
Departure +0.20 +0.49 -1.67 +1.26
Greatest 24hr 0.83 ON 27TH-28TH 0.83 ON 27TH-28TH 0.64 ON 27TH-28TH 1.17 ON 27TH-28TH
SNOW/SLEET
Monthly Total " 5.5 12.2
Greatest 24hr 2.8 ON 27TH 10.2 ON 28TH

BURLINGTON FORECAST AREA ACCUMULATED MONTHLY RAIN GAUGE PRECIPITATION (IN INCHES) FOR THE MONTH OF APRIL.

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BURLINGTON FORECAST AREA ACCUMULATED MONTHLY SNOWFALL (IN INCHES) FOR THE MONTH OF APRIL.

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MONTHLY WEATHER PATTERNS AND GLOBAL CLIMATE DRIVERS...

THE MAIN 500 MB WEATHER PATTERN DURING THE MONTH OF APRIL WAS AN ANOMALOUSLY STRONG RIDGE OF HIGH PRESSURE ACROSS THE EASTERN CONTINENTAL UNITED STATES WITH AN EVEN STRONGER TROUGH OF LOW PRESSURE IN THE WEST. HOWEVER, THIS MONTH-AVERAGED PATTERN BELIES THE DRASTIC CHANGES THAT TOOK PLACE DURING THE PERIOD. APRIL STARTED OUT WITH A VERY STRONG HIGH PRESSURE OVER THE EASTERN THIRD OF THE COUNTRY, BALANCED BY LOW PRESSURE ACROSS THE PACIFIC NORTHWEST AND THE NORTHERN ROCKY MOUNTAINS. THIS PATTERN SLOWLY CHANGED THROUGHOUT THE MONTH, WITH THE RIDGE AND TROUGH BOTH WEAKENING. BY THE MIDDLE OF THE MONTH, MOST OF THE COUNTRY SAW FAIRLY NORMAL 500 MB HEIGHTS, WITH A SLIGHT RIDGE SEEN OVER THE NORTH CENTRAL PORTION OF THE CONUS. HOWEVER, BY THE END OF APRIL, LOW PRESSURE DOMINATED, WITH TWO VERY DEEP LOW PRESSURE SYSTEMS, ONE OVER THE PACIFIC NORTHWEST AND THE OTHER ACROSS THE NORTHEAST. IT WAS THIS ANOMALOUSLY STRONG TROUGH THAT BROUGHT THE RECORD-BREAKING SNOW TO THE NORTH COUNTRY AT THE END OF THE MONTH.

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THE CLIMATE PREDICTION CENTER IS FORECASTING BOTH TEMPERATURES AND PRECIPITATION TO BE CLOSE TO NORMAL DURING THE MONTH OF MAY.

EL NINO IS EXPECTED TO COME TO AN END BY JUNE 2010. SEA SURFACE TEMPERATURES ACROSS THE EQUATORIAL PACIFIC OCEAN COOLED A BIT DURING APRIL, CAUSING EL NINO TO CONTINUE TO WEAKEN. HOWEVER...SEA SURFACE TEMPERATURES WERE STILL RUNNING SOME 0.5 DEGREES CELSIUS ABOVE NORMAL. WHILE NEAR NORMAL SEA SURFACE TEMPERATURES ARE MOST LIKELY THROUGH THE END OF THE YEAR...IT IS POSSIBLE SOME COOLER THAN NORMAL CONDITIONS WILL DEVELOP LATER THIS YEAR...LEADING TO LA NINA.

CLIMATE PREDICTION CENTER MAY 2010 PRECIPITATION OUTLOOK...

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CLIMATE PREDICITION CENTER MAY 2010 TEMPERATURE OUTLOOK...

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Page last modified: APRIL 21, 2007
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Figure 1: Burlington Monthly Temperature Trend
Figure 2: Montpelier Monthly Temperature Trend
Figure 3: Massena Monthly Temperature Trend
Figure 4: Saint Johnsbury Temperature Trend
Figure 5: Monthly Precipitation Map
Figure 6: Monthly Snowfall Map
Figure 7: 500MB Geopotential Height Anomalies
Figure 8: Climate Prediction Center Precipitation Outlook
Figure 9: Climate Prediction Center Temperature Outlook