BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 27, 2012
ALL TIMES ARE IN EASTERN STANDARD TIME
 
COMFORTABLE, HAZY LATE SPRING DAY
 
Today marks the second consecutive day of an overnight low of 63. This is
the warmest overnight low so far this year, and well above average for
late May. This temperature was also 3 degrees shy of tying the warmest
overnight low temperature of 66 set back in 2007 for this day.
 
Cirrus clouds have been present for most of the day and humidity values
have dropped into the high 40s. Haze has kept visibility down to only
30-35 miles today even with the low humidity values. Winds have been out
of the northeast inhibiting any rapid spike in temperatures.
 
Memorial Day is going to be very humid with a northeasterly wind and
a passing warm front tomorrow. This warm front brings along with it a
chance of showers and thunderstorms for most regions. Temperatures will
be in the low 70s with mostly cloudy skies.
 
 
Today's observations:
 
7 A.M.
Weather: Scattered altocumulus, broken dense cirrus, broken thin cirrus,
contrails all quadrants, hazy, shallow smoke layer all quadrants except
NE-SE
Temperature: 66F, Dew Point: 54F; Wind: NE at 12 kts,
Wind: Direction variable N-ENE
Sea-level pressure: 30.17 inches Hg, rising
Visibility: 40 miles, hazy
6-hour min. temp: 63F
BHO SA 1155 160 SCT E200 BKN 250 BKN 40 217/66/54/0512/017/ CONTRAILS ALQDS
HAZY SHALW K LYR ALQDS XCPT NE-SE WND 36V07/ 8/042 52020 10067 20063
 
10 A.M.
Weather: Scattered dense cirrus, broken thin cirrus, few small cumulus
forming over city N, few altocumulus SE-S, contrails all quadrants, hazy
Temperature: 70F, Dew Point: 53F; Wind: NE at 10 kts,
Wind: Direction variable N-E
Sea-level pressure: 30.18 inches Hg, steady 
Visibility: 30 miles, hazy
BHO SA 1455 200 SCT E250 BKN 35 219/70/53/0510/018/ FEW SM CU FRMNG OVR CTY
N FEW AC SE-S CONTRAILS ALQDS HAZY WND 36V09/ 8/142 50002
 
1 P.M.
Weather: Scattered dense cirrus, scattered thin cirrus, few altocumulus
NW-N, hazy
Temperature: 73F, Dew Point: 52F; Wind: NE at 10 kts,
Wind: Direction variable N-E
Sea-level pressure: 30.15 inches Hg, falling 
Visibility: 30 miles, hazy
6-hour max. temp: 74F
BHO SA 1755 200 SCT 250 SCT 30 211/73/52/0510/015/ FEW AC NW-N HAZY WND
01V08/ 8/051 55008 10074 20066
 
 
WEATHER SUMMARY FOR SATURDAY, MAY 26
 
TEMPERATURE (DEGREES F)
MAX.....84    NORMAL.....69
MIN.....63    NORMAL.....51
MEAN....74    NORMAL.....60
 
DEPARTURE FROM 30-YEAR NORMAL.......................+14
TOTAL DEPARTURE FOR THE MONTH.......................+69 [+2.5 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY...............0   DEPARTURE..........-6
TOTAL HEATING UNITS FOR THE MONTH.............174   DEPARTURE.........-70
TOTAL HEATING UNITS FOR THE SEASON...........4888   DEPARTURE.......-1382
TOTAL HEATING UNITS LAST SEASON TO DATE......6153   DIFFERENCE......-1265
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............24 SSW AT  3:09 A.M. *
                   AERO..................24 SW  AT  7:13 A.M.
                   ASOS..................23 SSW AT  3:07 A.M.
                   DAVIS.................23 SSW AT  3:07 A.M. RMY 23
THE FASTEST MILE FOR YESTERDAY...........17 SSW AT  3:04 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............17 SSW AT  3:08 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........17 SW  AT  2:30 A.M.
AVERAGE WIND SPEED AND DIRECTION.......10.0 W
                   ASOS.................9.9
                   DAVIS................9.6 SW [236 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..........3.52   DEPARTURE..........+0.16
                         ASOS..............3.41
TOTAL PRECIPITATION FOR THE YEAR..........13.13   DEPARTURE..........-8.78
                         ASOS.............13.14
     
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..........-0.1
TOTAL SNOWFALL FOR THE SEASON..............24.2    DEPARTURE.........-35.9
 
PRELIMINARY CLIMATE SUMMARY FOR MAY 2012 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
5/1  47/42/45/-8/0.65/0.0/000/00    33 SE  AERO 36 MPH SE  RMY 37
5/2  50/43/47/-6/0.05/0.0/000/00    16 ENE AERO 16 MPH ENE RMY 17
5/3  51/44/48/-5/0.08/0.0/000/00    14 SSE AERO 16 MPH SSE RMY N/A
5/4  56/47/52/-2/0.01/0.0/000/00    21 SSW AERO 25 MPH SSW RMY 23
5/5  57/46/52/-2/0.04/0.0/034/04    14 NE  AERO 15 MPH NE  RMY 15
5/6  58/45/52/-2/0.00/0.0/532/62    21 ENE AERO 21 MPH ENE RMY 21
5/7  67/48/58/+3/0.00/0.0/740/86    23 S   AERO 25 MPH S   RMY 25
5/8  57/48/53/-2/0.18/0.0/000/00    40 S   AERO 46 MPH S   RMY 46
5/9  61/54/58/+3/0.36/0.0/000/00    25 S   AERO 28 MPH S   RMY N/A
5/10 65/46/56/+1/0.98/0.0/234/27    33 W   AERO 36 MPH W   RMY 37
5/11 62/42/52/-4/T/0.0/539/62       30 WNW AERO 33 MPH WNW RMY 34
5/12 77/46/62/+6/0.00/0.0/862/99    30 W   AERO 30 MPH W   RMY 29
5/13 82/57/70/+14/0.00/0.0/314/36   27 S   AERO 29 MPH S   RMY 29
5/14 71/52/62/+5/0.05/0.0/096/11    23 S   AERO 24 MPH S   RMY 23
5/15 72/57/65/+8/0.43/0.0/123/14    32 S   AERO 35 MPH S   RMY 33
5/16 71/58/65/+8/0.12/0.0/141/16    23 S   AERO 24 MPH S   RMY N/A
5/17 69/50/60/+3/0.00/0.0/784/89    31 WNW AERO 32 MPH WNW RMY 26
5/18 69/49/59/+1/0.00/0.0/857/97    17 ESE AERO 17 MPH ESE RMY 17
5/19 74/51/63/+5/0.00/0.0/876/99    15 WNW AERO 15 MPH WNW RMY 16
5/20 79/56/68/+10/0.00/0.0/727/82   17 SE  AERO 17 MPH SE  RMY 17
5/21 64/52/58/-1/0.02/0.0/000/00    17 NE  AERO 16 MPH NNE RMY 18
5/22 61/56/59/0/0.54/0.0/000/00     23 NE  AERO 23 MPH NE  RMY 23 
5/23 75/57/66/+7/0.00/0.0/.../..    15 S   AERO 16 MPH S   RMY 15
5/24 75/59/67/+8/0.00/0.0/.../..    20 SSE AERO 21 MPH SE  RMY 21
5/25 73/57/65/+5/0/01/0.0/.../..    26 S   AERO 25 MPS S   RMY 25
5/26 84/63/74/+14/0.00/0.0/.../..   24 SSW AERO 24 MPH SW  RMY 23
 
5/27 morning low temp: 63F; the normal low is now 51F
 
DAILY RECORDS FOR MAY 2012
5/16 - TIED DAILY RECORD HIGH MINIMUM TEMP OF 56F;
ties the record of 56F in 1951 and 1961.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 27
HIGH 92F IN 1914
LOW 36F IN 1915
PRECIP 1.40 INS IN 1898
PEAK GUST 55 S IN 1956
 
RECORDS FOR MAY 28
HIGH 90F IN 1929
LOW 39F IN 1917
PRECIP 2.48 INS 1906
PEAK GUST 51e MPH NE IN 1946
 
TODAY'S REPORT PREPARED BY: George Tabeek