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Thursday, May 13, 2021

May 13, 2021

BLUE HILL METEOROLOGICAL OBSERVATORYMILTON, MASSACHUSETTSELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY MAY 13, 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

THURSDAY MAY 13, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0425E
SUNSET:  1857E

WARMER WITH A LIGHT NORTHWESTERLY WIND
ATOP GREAT BLUE HILL….

Today we observed almost clear skies this morning
turning into partly cloudy skies as the day went on.
Visibility was great at 75 miles, and conditions
were dry considering the dew point was near freezing
despite temperatures in the mid 60’s. The humidity was
30% at the 1 P.M. observation. Some possible rainfall
was visible to the southwest at the 10 A.M. observation,
but there is some doubt as to whether or not it hit the
ground (due to how dry it was at the surface layer).  
 
The average wind speed is around 10 mph from the northwest
with a gust of only 21 mph since 7 A.M.

The high so far today is 67F, this is a degree
above the normal high of 66F. The low since midnight
is 45F, which is 2 degrees below the daily normal low
of 47F.


PRELIMINARY STATS FOR APRIL 2021

TEMPERATURE, Deg. F
Avg. Max. 57.2 [+1.5]Avg. Min. 37.8 [+0.1]Mean      47.5 [+0.8]24-hour corrected mean: 47.0
Max. for month: 75F on the 10th
Min. for month: 23F on the 3rd

HEATING DEGREE DAYS
Total heating units:    519 [-32]Total for the season:  5341 [-694]Total for last season: 5521

PRECIPITATION, Inches
Total: 4.89 [+0.45]Greatest in 24 hrs: 2.45 ins. on the 15th-16th

SNOWFALL, Inches
Total: 3.6 [+0.6]Greatest in 24 hrs: 3.6 ins. on the 16th

WIND, mph
Avg. uncorrected wind speed: 12.1 mph
Avg. corrected wind speed:   12.5 mph
Prevailing wind direction:   WNW [16%]Peak gust and direction:     58 WNW on the 30th

SUNSHINE:
Campbell-Stokes card minutes: 12444 minutes of a possible 23250 or 54%
Astronomical total minutes: 12904 minutes of a possible 24128 or 53%


Today’s Observations:

7 A.M.
Weather: Few cumulus and altocumulus
Temperature: 53F; Dew Point: 37F; Relative Humidity: 53%
Wind: NW at 7 kts
Sea-level pressure: 30.19 in/Hg, steady, then rising
Visibility: 75 miles
6-hr Max temp: 53F
6-hr Min temp: 45F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0.0 ins.
BHO SA 1155 CLR 75 222/53/37/3207/019/ FEW CU/AC ALQDS/
8/180 52008 10053 20045

10 A.M.
Weather: Broken cumulus and altocumulus, virga seen
SW-W
Temperature: 62F; Dew Point: 33F; Relative Humidity: 32%
Wind: NW @ 5 kts, light
Sea-level pressure: 30.18 in Hg; rising steadily
Visibility: 75 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 60 BKN 140 BKN 75 220/62/33/3205/018/ VIRGA
SW-W WND LGT/ 8/260 58002

1 P.M.
Weather: Scattered cumulus, broken altocumulus
Temperature: 64F, Dew point: 30F; Relative Humidity: 28%
Wind: WNW @ 7 kts
Sea-level pressure: 30.16 in Hg; falling unsteadily
Visibility: 75 miles
6-hr Max temp: 67F
6-hr Min temp: 53F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 50 SCT 110 BKN 75 212/64/30/3007/016/ 8/860
56008 10067 20053


SUMMARY FOR WEDNESDAY, MAY 12, 2021

TEMPERATURE (DEGREES F)
MAX…….65     NORMAL…..65
MIN…….41     NORMAL…..47
MEAN……53     NORMAL…..56

DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. -3
TOTAL DEPARTURE FOR THE MONTH……………….-22 [-2.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL THRU JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………12  DEPARTURE…….+3
TOTAL HEATING UNITS FOR THE MONTH…………..149  DEPARTURE……+16
TOTAL HEATING UNITS FOR THE SEASON…………5490  DEPARTURE…..-677
TOTAL HEATING UNITS LAST SEASON TO DATE…….5683  DEPARTURE…..-193

COOLING DEGREE DAYS (SEASON JAN THRU DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 0  DEPARTURE……. 0
TOTAL COOLING UNITS FOR THE MONTH…………… 0  DEPARTURE…….-3
TOTAL COOLING UNITS FOR THE SEASON………….. 0  DEPARTURE…….-5
TOTAL COOLING UNITS LAST SEASON TO DATE……… 2  DEPARTURE…….-2

PEAK WIND GUST (MPH):
                     420C/Official…………..28 NW  @ 4:05 P.M.
                     AEROVANE (south tower)…..MISSING
                     ASOS…………………..28 WNW @ 6:12 A.M.
                     DAVIS #1……………….29 WNW @ 6:38 A.M.
                     DAVIS #2 (south tower)…..34 NW  @ 4:03 P.M.
                     RMY……………………31     @ 6:37 A.M.
                     VECTOR…………………35     @ 4:05 P.M.
                     MERLIN…………………29

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NW  @  4:06 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 NW  @  4:12 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 NNW @  4:05 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 NW  @  4:04 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..20 NNW @  4:03 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..20     @  4:03 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…… 9.9 NW [238 total miles]                     ASOS………………… 9.6
                     DAVIS #1……………..10.3 NW
                     DAVIS #2……………..10.3 NW
                     RMY…………………. 9.5 NW
                     VECTOR……………….10.0


PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.13
                             ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….1.78  DEPARTURE….+0.31
                             ASOS………….1.73
TOTAL PRECIPITATION FOR THE YEAR………….16.84  DEPARTURE….-3.18
                              ASOS………..17.01


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/…/..       31 WNW  AERO 35 WNW  RMY 40
05/02   76/48/62/+9/0.01/0.0/…/..       41 SW   AERO 41 SW   RMY 46
05/03   67/48/58/+5/0.07/0.0/…/..       21 E    AERO 20 E    RMY 20
05/04   50/44/47/-7/0.78/0.0/…/..       36 NNE  AERO 32 NNE  RMY 37
05/05   48/44/46/-8/0.45/0.0/…/..       18 ESE  AERO 14 ESE  RMY 17
05/06   64/45/55/+1/0.00/0.0/…/..       33 NW   AERO 38 NNW  RMY 39
05/07   61/43/52/-3/0.00/0.0/…/..       28 ESE  AERO 22 ESE  RMY 26
05/08   54/40/47/-8/0.00/0.0/…/..       24 SSW  AERO 23 SSW  RMY 25
05/09   66/42/54/-1/T/0.0/…/..          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 The low since midnight is 45F, the daily normal low is 47F
 

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

RECORDS FOR MAY 13
HIGH 85F IN 1947
LOW 32F IN 2020
PRECIP 2.39 INCHES IN 2006
PEAK GUST 49 MPH NNW IN 1965

RECORDS FOR MAY 14
HIGH 85F IN 1961
LOW 33F IN 1895
PRECIP 1.93 INCHES IN 2006
PEAK GUST 53 MPH S IN 2009

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
§ 01

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Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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