BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

MONDAY MAY 24, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0415E
SUNSET:  1908E

AFTER A HOT AND HUMID WEEKEND, MUCH APPRECIATED RELIEF TODAY....

Prior to a strong cold front moving through the region
late yesterday, hot temperatures and modest humidity
made for a rather uncomfortable day for many. The high
yesterday made it to 87 degrees with dew points in the
low to mid 60s. Some of the surrounding stations recorded
temperatures of 90 degrees, including Boston's Logan
International Airport.

The cold front came through late yesterday afternoon with
little fanfare. A wind shift to NNW and a gust to 38 mph
was the main "action" with the front. A brief, but light
rain shower also occurred amounting to only a trace.

The last measurable rainfall occurred 8 days ago (0.01"),
and it shows. The monthly deficit has exceeded an inch,
and the annual total is more than four and a half inches
below normal.

Today's weather if featuring much nicer conditions with
a mix of sun and clouds, much drier air, and cooler
temperatures.

The high so far today is 68F, which is 1 degree
below the normal high of 69F. The low since midnight
is 52F, which is 2 degrees above the daily normal low
of 50F.


Today's Observations:

7 A.M.
Weather: Scattered stratocumulus/cumulus, scattered altocumulus,
thin broken cirrus
Temperature: 57F; Dew Point: 41F; Relative Humidity: 54%
Wind: E @ 5 kts
Sea-level pressure: 30.30 in. Hg; rising, then more rapidly
Visibility: 60 miles
6-hr Max temp: 57F
6-hr Min temp: 52F
24-hr Precip: Trace
BHO SA 1155 60 SCT 110 SCT E250 -BKN 60 260/57/41/0905/030/
8/831 53028 70000 10057 20052


10 A.M.
Weather: Broken stratocumulus/cumulus, thin broken cirrus
Temperature: 63F; Dew Point: 34F; Relative Humidity: 33%
Wind: SSE @ 2 kts, wind light and variable
Sea-level pressure: 30.33 in Hg; rising then falling
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E55 BKN 250 -BKN 60 270/63/34/1602/033/ WND L/V/
8/801 50010

1 P.M.
Weather: Broken stratocumulus, thin broken cirrus
Temperature: 66F, Dew point: 36F; Relative Humidity: 32%
Wind: W @ 2 kts, wind light and variable
Sea-level pressure: 30.29 in Hg; steady then falling
Visibility: 60 miles
6-hr Max temp: 68F
6-hr Min temp: 57F
6-hr Precip: 0.00 ins.
BHO SA 1755 E55 BKN 250 -BKN 60 257/66/36/2602/029/ WND L/V/
8/501 58013 10068 20057



SUMMARY FOR SUNDAY, MAY 23, 2021

TEMPERATURE (DEGREES F)
MAX.......87     NORMAL.....68
MIN.......58     NORMAL.....50
MEAN......73     NORMAL.....59

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL.......+14
TOTAL DEPARTURE FOR THE MONTH...................+65 [+2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY............... 0  DEPARTURE.......-7
TOTAL HEATING UNITS FOR THE MONTH..............161  DEPARTURE......-61
TOTAL HEATING UNITS FOR THE SEASON............5502  DEPARTURE.....-754
TOTAL HEATING UNITS LAST SEASON TO DATE.......5771  DEPARTURE.....-278

COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY............... 8  DEPARTURE.......+7
TOTAL COOLING UNITS FOR THE MONTH...............19  DEPARTURE.......+7
TOTAL COOLING UNITS FOR THE SEASON..............19  DEPARTURE.......+5
TOTAL COOLING UNITS LAST SEASON TO DATE......... 3  DEPARTURE......+16

PEAK WIND GUST (MPH):
                     420C/Official..............38 NNW  @  4:07 P.M.
                     AEROVANE (south tower).....37 NNW  @  6:00 P.M.
                     ASOS.......................38 NNW  @  4:07 P.M.
                     DAVIS #1...................37 NNW  @  4:06 P.M.
                     DAVIS #2 (south tower).....37 NNW  @  4:06 P.M.
                     RMY........................40      @  4:01 P.M.
                     VECTOR.....................42      @  3:58 P.M.
                     MERLIN.....................37

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL..................26 NNW @  6:21 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE...................24 NNW @  6:28 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE...............26 NNW @  4:07 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE...............25 NNW @  4:00 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE....................23 N   @  3:57 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE.................25     @  3:57 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL.......12.3 WNW [295 total miles]
                     ASOS......................12.3
                     DAVIS #1..................12.5 NW
                     DAVIS #2..................12.9 NW
                     RMY.......................11.4 NW
                     VECTOR....................12.3


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M......TRACE  DEPARTURE....-0.15                                              ASOS.............0.00
TOTAL PRECIPITATION FOR THE MONTH.............1.80  DEPARTURE....-1.10
                             ASOS.............1.75
TOTAL PRECIPITATION FOR THE YEAR.............16.86  DEPARTURE....-4.59
                              ASOS...........17.03


PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M:    Missing data

05/01   62/38/50/-3/0.06/0.0/659/78       31 WNW  AERO 35 WNW  RMY 40
05/02   76/48/62/+9/0.01/0.0/220/26       41 SW   AERO 41 SW   RMY 46
05/03   67/48/58/+5/0.07/0.0/400/47       21 E    AERO 20 E    RMY 20
05/04   50/44/47/-7/0.78/0.0/000/00       36 NNE  AERO 32 NNE  RMY 37
05/05   48/44/46/-8/0.47/0.0/000/00       18 ESE  AERO 14 ESE  RMY 17
05/06   64/45/55/+1/0.00/0.0/780/91       33 NW   AERO 38 NNW  RMY 39
05/07   61/43/52/-3/0.00/0.0/516/60       28 ESE  AERO 22 ESE  RMY 26
05/08   54/40/47/-8/0.00/0.0/069/08       24 SSW  AERO 23 SSW  RMY 25
05/09   66/42/54/-1/T/0.0/579/67          30 SW   AERO 29 SW   RMY 34
05/10   60/45/53/-2/0.39/0.0/078/09       21 W    AERO 20 W    RMY 20
05/11   63/45/54/-2/0.00/0.0/764/88       38 WNW  AERO 41 WNW  RMY 41
05/12   65/41/53/-3/0.00/0.0/722/83       28 NW   AERO M  M    RMY 31
05/13   69/45/57/+1/0.00/0.0/759/87       22 WNW  AERO 21 WNW  RMY 21
05/14   76/49/63/+8/0.00/0.0/725/83       23 WNW  AERO 23 WNW  RMY 25
05/15   75/55/65/+8/0.01/0.0/569/65       24 SSE  AERO 26 SSE  RMY 26
05/16   78/54/66/+9/0.01/0.0/483/55       36 W    AERO 37 W    RMY 42
05/17   77/52/65/+8/0.00/0.0/.../..       20 SSW  AERO 21 SSW  RMY 21
05/18   81/54/68/+10/T/0.0/.../..         32 W    AERO 30 W    RMY 32
05/19   75/55/65/+7/0.00/0.0/.../..       25 NE   AERO 23 NNE  RMY 27
05/20   75/52/64/+6/0.00/0.0/.../..       18 ESE  AERO 18 ESE  RMY 19
05/21   78/50/64/+5/T/0.0/.../..          23 S    AERO 22 S    RMY 26
05/22   87/56/72/+13/T/0.0/.../..         25 WNW  AERO 21 WNW  RMY 24
05/23   87/58/73/+14/T/0.0/.../..         38 NNW  AERO 37 NNW  RMY 40

05/24 The low since midnight is 52F, the daily normal low is 50F
 

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR MAY 24
HIGH 92F IN 1964
LOW 35F IN 1956
PRECIP 2.13 INS IN 1951
PEAK GUST 54 MPH NNE IN 2005

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)

TODAY'S REPORT PREPARED BY: Matt Douglas