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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, MAY 25, 2015 MEMORIAL DAY
ALL TIMES ARE IN EASTERN STANDARD TIME
MOSTLY CLOUDY BUT DRY AGAIN TODAY WITH WARM TEMPERATURES
Our dry month has continued at the summit on this Memorial Day, with only
0.63 inches of rain so far this month. The day began partly cloudy, but
clouds began to dominate by mid-morning and into the afternoon, with a warm
front pushing through the region. Despite the cloud cover, temperatures
have been on the warm side of normal, with a morning low of 56F and a high
so far of 80F. May is running about 4 degrees above average so far, and
with a warm end to the month expected this May should rank among the warmest
on record here at Blue Hill. Winds have been steady at about 10mph, mainly
from the SW. Hazy conditions have limited the visibility to about 40 miles,
and smoke from a brush fire to our northeast has been visible much of the day.
Today’s Observations:
7 A.M.
Weather: Broken cirrus, few small cumulus WNW, few altocumulus mostly NW-E
and overhead
Temperature: 63F; Dew Point: 51F; Wind: SSW at 9 kts
Sea-level pressure: 30.26 ins. Hg, rising then rising more slowly
Visibility: 40 miles, distant haze
6-hr Max temp: 63F
6-hr Min temp: 56F
24-hr precip: 0.00 ins.
BHO SA 1155 E250 BKN 40 246/63/51/2009/026/ FEW SML CU WNW
FEW AC MSTLY NW-E AND OVHD DSNT HZ/ 8/151 51006 10063 20056
10 A.M.
Weather: Broken altostratus/altocumulus, broken altocumulus, small forest
fire 2 miles NE, thin smoke drifting NE-E
Temperature: 76F; Dew Point: 53F; Wind: WSW at 10 kts
Sea-level pressure: 30.26 ins. Hg, rising slightly
Visibility: 40 miles, haze aloft
BHO SA 1455 E95 BKN 170 BKN 40 248/76/53/2510/026/ HZ ALF
SML FOREST FIRE 2 MI NE THN K DRFTNG NE-E/ 8/070 53002
1 P.M.
Weather: Broken altostratus/altocumulus, overcast altocumulus, small forest
fire 2 miles NE, thin smoke drifting NE-E
Temperature: 78F; Dew Point: 56F; Wind: SSW at 12 kts
Sea-level pressure: 30.23 ins. Hg, rising then falling
Visibility: 35 miles, haze aloft
6-Hr Max temp: 80F
6-Hr Min temp: 63F
BHO SA 1755 E100 BKN 160 OVC 35 237/78/56/2012/023/ FEW BINOVC HZ ALF
SML FOREST FIRE 2 MI NE THN K DRFTNG NE/ 8/070 58011 10080 20063
SUMMARY FOR SUNDAY, MAY 24, 2015
TEMPERATURE (DEGREES F)
MAX…..81 NORMAL…..69
MIN…..50 NORMAL…..50
MEAN….66 NORMAL…..59
DEPARTURE FROM 30-YEAR NORMAL……………………+7
TOTAL DEPARTURE FOR THE MONTH…………………..+98 [+3.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0 DEPARTURE………..-7
TOTAL HEATING UNITS FOR THE MONTH………….130 DEPARTURE……….-98
TOTAL HEATING UNITS FOR THE SEASON………..6401 DEPARTURE………+138
TOTAL HEATING UNITS LAST SEASON TO DATE……6331 DIFFERENCE………+70
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..1 DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….17 DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE SEASON…………17 DEPARTURE……….+2
TOTAL COOLING UNITS LAST SEASON TO DATE…….13 DIFFERENCE………+4
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………28 SSW AT 6:50 P.M. *
ASOS…………………..30 SSW AT 5:58 P.M.
DAVIS………………….29 WSW AT 3:20 P.M. RMY 32
FASTEST MILE FOR YESTERDAY………………..23 SSW AT 5:53 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..23 SSW AT 5:56 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….23 SSW AT 5:56 P.M.
AVERAGE WIND SPEED AND DIRECTION………….15.2 SW
ASOS………………….15.0
DAVIS…………………13.5 SW [233 deg.]
* Last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00 DEPARTURE…..-0.15
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..0.63 DEPARTURE…..-2.42
ASOS……………0.63
TOTAL PRECIPITATION FOR THE YEAR………..18.55 DEPARTURE…..-2.92
ASOS…………….N/A ***
*** ASOS annual totals not available due to erroneous readings
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………..0.0 DEPARTURE……0.0
TOTAL SNOWFALL FOR THE MONTH……………..0.0 DEPARTURE……0.0
TOTAL SNOWFALL FOR THE SEASON…………..150.8 DEPARTURE….+88.1
PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY: R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
5/1 52/37/45/-8/0.00/0.0/354/42 21 NE RMY 20
5/2 63/35/49/-4/0.00/0.0/668/79 20 S RMY 20
5/3 74/44/59/+6/0.00/0.0/509/60 22 S RMY 22
5/4 83/47/65/+11/0.00/0.0/783/92 39 SSW RMY 45
5/5 77/56/67/+13/0.03/0.0/222/26 29 SW RMY N/A
5/6 74/54/64/+10/0.00/0.0/574/67 24 SSW RMY 25
5/7 84/52/68/+13/0.00/0.0/824/96 29 S RMY 32
5/8 74/44/59/+4/0.00/0.0/809/94 27 NNE RMY 26
5/9 77/44/61/+6/0.00/0.0/509/59 30 S RMY 32
5/10 88/60/74/+19/0.00/0.0/692/80 28 SSW RMY 30
5/11 84/48/66/+10/0.00/0.0/529/61 30 NE RMY 31
5/12 84/47/66/+10/0.24/0.0/287/33 33 WNW RMY 37
5/13 67/47/57/+1/0.00/0.0/820/94 31 WNW RMY N/A
5/14 70/44/57/+0/0.00/0.0/848/97 22 NW RMY 22
5/15 73/51/62/+5/0.00/0.0/491/56 20 WSW RMY 21
5/16 68/53/61/+4/T/0.0/053/06 23 S RMY 24
5/17 79/50/65/+8/T/0.0/783/89 21 NE RMY N/A
5/18 62/48/55/-3/…./0.0/538/61 25 NE RMY N/A
5/19 63/50/57/-1/0.36/0.0/000/00 24 S RMY 26
5/20 66/46/56/-2/0.00/0.0/…/.. 32 WNW RMY 37
5/21 66/43/55/-4/…./0.0/…/.. 24 S RMY 24
5/22 73/49/61/+2/T/0.0/…/.. 32 NW RMY 36
5/23 64/40/52/-7/0.00/0.0/…/.. 28 WNW RMY 32
5/24 81/50/66/+7/0.00/0.0/…/.. 28 SSW RMY 31
5/25 low since midnight is 56F; normal low is now 51F
DAILY RECORDS FOR MAY 2015
NONE SO FAR.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR MAY 25
HIGH 91F IN 2007
LOW 37F IN 1967
PRECIP 3.73 INS IN 1967
PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY)
RECORDS FOR MAY 26
HIGH 94F IN 2010 (RECORD FOR MAY)
LOW 37F IN 1972,2013
PRECIP 1.73 INS IN 2003
SNOWFALL TRACE IN 1967 (Fell as ice pellets in nor’easter)
PEAK GUST 62 MPH NE IN 1967
TODAY’S REPORT PREPARED BY: Jonathan O’Brien
