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May 2010
North Country Monthly Climate Summary

TEMPERATURE SUMMARY...

The warmer-than-normal spring continued with May, as monthly temperatures remained above seasonal averages across the North Country. The month started out hot throughout the entire area, with many locations reaching into the mid 80s on the 2nd. This was quickly followed by a cool stretch, right on Mother's Day weekend. Record low temperatures were set at Massena and Burlington on the 11th and the 13th, respectively. Temperatures struggled to get into the 40s on the 9th, with numerous spots reporting snow. Thankfully, the cool temperatures were fairly short-lived, as the region saw near-normal highs and lows the 15th through the 22nd. The warmest readings of May arrived on the 23rd through the 26th, with temperatures reaching into the 80s and 90s. Several daily record highs were set or tied on the 25th and 26th across the region. Thereafter, things returned to normal through the remainder of the month.

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

  Burlington Montpelier Massena Saint Johnsbury
Avg. Temp 60.1 56.7 59.0 58.6
Departure +3.6 +2.3 +2.5 +2.3
Highest 92 on 26th 87 on 26th 96 on 26th 88 on 25th
Lowest 28 on 11th 26 on 11th 27 on 11th 26 ON 11th

Below are daily temperature graphs for the month of May for Burlington, Montpelier, Massena, and Saint Johnsbury.

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PRECIPITATION SUMMARY...

The month of May was fairly dry, with much of the North Country receiving less-than-normal rainfall. Monthly totals were mainly 0.5 1.5 inches in the Champlain Valley, 1.5 to 2.5 in northern New York, and 2 to 3 inches across the remainder of Vermont. This left many locations some 1 to 2 inches below normal for the month. Widespread rain fell across the area early in the month as a couple of cold fronts passed through. A very strong cold front moved across the region on the 8th, bringing light snow to many locations over Mother's Day weekend. Snowfall amounts ranged from just a trace over much of the area to 4 inches in portions of Lamoille County. Rainfall amounts with these were fairly light. For the remainder of the month, precipitation was more sporadic. Low pressure moving up the coast spread more light rain across the eastern portions of Vermont on the 19th, while the rest of the region stayed dry.

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

  Burlington Montpelier Massena Saint Johnsbury
Monthly Total " 1.52 2.25 1.63 2.24
Departure -1.80 -1.07 -1.18 -1.11
Greatest 24hr 0.38 on 4th 0.66 on 7th-8th 0.61 on 5th-6th 0.68 on 8th
SNOW/SLEET
Monthly Total " Trace 0.1
Greatest 24hr Trace on 9th 0.1 on 10th


BURLINGTON FORECAST AREA ACCUMULATED MONTHLY PRECIPITATION (IN INCHES) FOR THE MONTH OF MAY

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

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MONTHLY WEATHER PATTERNS AND GLOBAL CLIMATE DRIVERS...

The main 500 MB weather pattern during the month of May was anomalously strong low pressure of the Northern Rocky Mountains and an even deeper low off the Canadian Maritimes. High pressure was squeezed between these two features, stretching across eastern Candada southward into the mid-Atlantic states. The western trough was strongest during the first part of the month, allowing a ridge of mild air to build into New England. This trough shifted east, allowing colder temperatures and even some snow to spread over Vermont and northern New York. However, another, stronger ridge quickly followed, resulting in even warmer temperatures and dry conditions by the end of the month.

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The Climate Prediction Center is forecasting both temperatures and precipitation have equal chances of being above or below normal for the month of June.

El Nino dissipated during May 2010 as sea-surface temperatures across the equatorial Pacific Ocean continued to cool. A growing number of forecast models indicate that La Nina will develop sometime this summer. This is supported by recent observations that show cooling trends in the Pacific Ocean. Confidence is therefore increasing that conditions will transition to La Nina sometime between June and August.

CLIMATE PREDICTION CENTER JUNE 2010 PRECIPITATION OUTLOOK...

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CLIMATE PREDICTION CENTER JUNE 2010 TEMPERATURE OUTLOOK...

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Page last modified: May 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