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Wednesday, May 19, 2021

May 19, 2021

BLUE HILL METEOROLOGICAL OBSERVATORYMILTON, MASSACHUSETTSELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, MAY 19, 2021ALL TIMES ARE IN EASTERN STANDARD…

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

WEDNESDAY, MAY 19, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0419E
SUNSET:  1903E

WARM AND HAZY WITH A COOL NORTHEASTERLY BREEZE….

Today started and ended hazy with an average visibility
of 30 miles with a maximum of 70 miles being seen at the
10 A.M. observation. Weather has been mostly clear and
warmer than normal, but a light breeze off the ocean
at around 10 mph has been observed.  

BHO Mean Date of the First 80 deg F: May 7th
BHO Earliest Date of the First 80 deg F: March 15th, 1990
BHO Latest Date of the First 80 deg F: June 19th, 1917
This data was prepared by our Chief Scientist Mike Iacono.

-Temperature information written by Matt Douglas

The high so far today is 73F, which is 6 degrees
above the normal high of 67F. The low since midnight
is 60F, which is 11 degrees above the daily normal low
of 49F.


Today’s Observations:

7 A.M.
Weather: Scattered cirrus, few altocumulus
Temperature: 64F; Dew Point: 40F; Relative Humidity: 40%
Wind: NE at 9G19 kts
Sea-level pressure: 30.28 in. Hg; rising steadily
Visibility: 25 miles, hazy
6-hr Max temp: 64F
6-hr Min temp: 60F
24-hr Precip: Trace
24-hr Snow: 0.0 ins.
Snow Depth: 0.0 ins.
BHO SA 1155 250 SCT 25 254/64/40/0509G19/028/ FEW AC ALQDS
HAZY/ 8/088 70000 53026 10064 20060

10 A.M.
Weather: Clear, few cirrus
Temperature: 70F; Dew Point: 32F; Relative Humidity: 24%
Wind: ENE @ 7 kts
Sea-level pressure: 30.32 in Hg; rising steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 CLR 70 267/70/32/0707/032/ FEW CI ALQDS/
8/001 51013

1 P.M.
Weather: Clear, few cirrus
Temperature: 73F, Dew point: 36F; Relative Humidity: 26%
Wind: E @ 8 kts
Sea-level pressure: 30.31 in Hg; falling, then steady
Visibility: 40 miles
6-hr Max temp: 73F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 CLR 40 262/73/36/0908/031/ FEW CI ALQDS/ 8/001
58005 10073 20064  


SUMMARY FOR TUESDAY, MAY 18, 2021

TEMPERATURE (DEGREES F)
MAX…….81     NORMAL…..67
MIN…….54     NORMAL…..48
MEAN……68     NORMAL…..58

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+10
TOTAL DEPARTURE FOR THE MONTH……………….+20 [+0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………… 0  DEPARTURE…….-8
TOTAL HEATING UNITS FOR THE MONTH…………..159  DEPARTURE……-26
TOTAL HEATING UNITS FOR THE SEASON…………5500  DEPARTURE…..-720
TOTAL HEATING UNITS LAST SEASON TO DATE…….5739  DEPARTURE…..-239

COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 3  DEPARTURE…….+2
TOTAL COOLING UNITS FOR THE MONTH…………… 4  DEPARTURE…….-3
TOTAL COOLING UNITS FOR THE SEASON………….. 4  DEPARTURE…….-5
TOTAL COOLING UNITS LAST SEASON TO DATE……… 2  DEPARTURE…….+2

PEAK WIND GUST (MPH):
                     420C/Official…………..32 W    @  1:39 P.M.
                     AEROVANE (south tower)…..30 W    @  1:39 P.M.
                     ASOS…………………..23 W    @  1:39 P.M.
                     DAVIS #1……………….33 W    @  1:40 P.M.
                     DAVIS #2 (south tower)…..32 W    @  1:41 P.M.
                     RMY……………………32      @  1:36 P.M.
                     VECTOR…………………37      @  1:38 P.M.
                     MERLIN…………………32

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 W   @  1:41 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 W   @  1:40 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 W   @  1:40 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 W   @  1:42 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..21 WNW @  1:38 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..23     @  1:37 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……11.5 WNW [276 total miles]                     ASOS…………………11.0
                     DAVIS #1……………..12.0 WNW
                     DAVIS #2……………..12.2 WNW
                     RMY………………….10.8 WNW
                     VECTOR……………….11.5


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……TRACE  DEPARTURE….-0.13
                            ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….1.80  DEPARTURE….-0.41
                             ASOS………….1.74
TOTAL PRECIPITATION FOR THE YEAR………….16.86  DEPARTURE….-3.90
                              ASOS………..17.02


PRELIMINARY CLIMATE SUMMARY FOR APRIL 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

04/01   56/30/43/+2/0.89/T/000/00        44 NW   AERO 51 NW   RMY 49
04/02   37/24/31/-10/0.00/0.0/614/80     28 NW   AERO 32 NNW  RMY 30
04/03   48/23/36/-6/0.00/0.0/755/98      24 NW   AERO 25 NW   RMY 26
04/04   58/33/46/+4/0.00/0.0/734/95      38 NNW  AERO 41 NNW  RMY 41
04/05   57/41/49/+6/T/T/031/04           41 NNW  AERO 48 NNW  RMY 50
04/06   61/40/51/+8/0.00/0.0/412/53      26 NNW  AERO 25 NNW  RMY 31
04/07   57/41/49/+6/0.00/0.0/391/50      23 ENE  AERO 21 ENE  RMY 22
04/08   59/43/51/+7/0.00/0.0/745/95      22 ENE  AERO 22 ENE  RMY 24
04/09   69/42/56/+12/0.00/0.0/707/90     24 S    AERO  M   M  RMY 26
04/10   75/43/59/+14/0.00/0.0/576/73     26 SSW  AERO 28 SSW  RMY 30
04/11   53/40/47/+2/T/0.0/000/00         33 ENE  AERO 33 ENE  RMY 34
04/12   46/37/42/-3/0.05/0.0/000/00      36 ENE  AERO 37 ENE  RMY 41
04/13   56/37/47/+1/T/0.0/415/52         31 NE   AERO 30 NE   RMY 33
04/14   56/42/49/+3/0.00/0.0/729/91      22 ESE  AERO 23 ESE  RMY 22
04/15   51/37/44/-3/0.30/0.0/016/02      26 ESE  AERO 25 ESE  RMY 28
04/16   39/31/35/-12/2.22/3.6/000/00     48 NNW  AERO 58 NNW  RMY 58
04/17   45/34/40/-7/0.07/T/040/05        27 NNW  AERO 30 NNW  RMY 29
04/18   60/38/49/+1/0.00/0.0/666/82      28 NW   AERO 28 NW   RMY 31
04/19   66/44/55/+7/T/0.0/619/76         22 SSW  AERO 25 SSW  RMY 28
04/20   72/45/59/+10/0.00/0.0/564/69     38 SW   AERO 37 WSW  RMY 40
04/21   68/32/50/+1/0.48/*T/435/53       45 S    AERO 51 S    RMY 51 TSTM
04/22   44/28/36/-13/T/T/658/80          54 W    AERO 55 W    RMY 59
04/23   58/32/45/-5/0.00/0.0/817/99      47 W    AERO 48 W    RMY 52
04/24   70/44/57/+7/0.00/0.0/753/91      33 WNW  AERO 37 WNW  RMY 55
04/25   54/44/49/-1/0.20/0.0/017/02      23 NNE  AERO 20 SSW  RMY 24
04/26   55/40/48/-3/0.00/0.0/825/99      39 NW   AERO 40 NW   RMY 43
04/27   67/38/53/+2/T/0.0/359/43         26 W    AERO 28 WNW  RMY 28
04/28   63/46/55/+3/0.18/0.0/352/42      18 ENE  AERO 21 WNW  RMY 20
04/29   54/44/48/-4/0.42/0.0/008/01      18 ENE  AERO 20 NNE  RMY 19
04/30   62/41/52/0/0.08/0.0/666/79       58 WNW  AERO 60 WNW  RMY 65


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/…/..       21 W    AERO 20 W    RMY 20
05/11   63/45/54/-2/0.00/0.0/…/..       38 WNW  AERO 41 WNW  RMY 41
05/12   65/41/53/-3/0.00/0.0/…/..       28 NW   AERO M  M    RMY 31
05/13   69/45/57/+1/0.00/0.0/…/..       22 WNW  AERO 21 WNW  RMY 21
05/14   76/49/63/+8/0.00/0.0/…/..       23 WNW  AERO 23 WNW  RMY 25
05/15   75/55/65/+8/0.01/0.0/…/..       24 SSE  AERO 26 SSE  RMY 26
05/16   78/54/66/+9/0.01/0.0/…/..       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 The low since midnight is 60F, the daily normal low is 49F
 

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

RECORDS FOR MAY 19
HIGH 91F IN 1962
LOW 34F IN 2002
PRECIP 1.54 INCHES IN 1900
PEAK GUST 58 MPH NW IN 1964

RECORDS FOR MAY 20
HIGH 91F IN 1975,1996
LOW 37F IN 1948, 2002
PRECIP 1.65 INCHES IN 1969
PEAK GUST 57 MPH S IN 1963, WNW IN 1982

TODAY’S REPORT PREPARED BY: Benjamin Turner

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
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