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Tuesday, July 7, 2020

July 7, 2020

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, JULY 7, 2020 ALL TIMES ARE…

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

TUESDAY, JULY 7, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

PLENTY OF SUNSHINE AND A BIT WARMER TODAY…

After a brief period of clouds and fog early this
morning, clouds broke leading to an abundance of
sunshine. However as we’ve moved into the afternoon,
more high cloudiness is moving in helping to dim the
sun a bit at times.

Winds have become a bit gusty this afternoon out of
the south with gusts between 20-25 mph.

Also of note today is the dropping dew point which
started the day in the low 60s, but has fallen into
the low 50s this afternoon. This is making for a
comfortable feel out there today following several
humid days.

The high so far today is 78 degrees, this is 2 degrees
below the daily normal high of 80F. The low since
midnight is 60F, which is 2 degrees below the daily
normal low of 62F.

PRELIMINARY STATS FOR JUNE 2020

TEMPERATURE, Deg. F
Avg. Max. 78.0 [+3.0] Avg. Min. 59.1 [+2.0] Mean      68.6 [+2.5] 24-hour corrected mean: 67.5
Max. for month: 90F on the 20th
Min. for month: 42F on the 1st

HEATING DEGREE DAYS
Total heating units:     40 [-33] Total for the season:  5852 [-402] Total for last season: 6254

COOLING DEGREE DAYS
Total cooling units:    152  [+47] Total for the season:   184  [+55] Total for last season:  89

PRECIPITATION, Inches
Total: 7.56 [+3.25] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 9.1 mph
Avg. corrected wind speed:   9.8 mph
Prevailing wind direction:   S [15%] Peak gust and direction:     55 SW on the 6th

SUNSHINE:
Campbell-Stokes card minutes: 15996 minutes of a possible 26376 or 61%
Astronomical total minutes: 16650 minutes of a possible 27422 or 61%

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, broken altocumulus/altocumulus
castellanus
Temperature: 64F; Dew Point: 61F; Relative Humidity: 90%
Wind: S at 4 kts, wind light
Sea-level pressure: 30.20 ins. Hg: rising, then falling
Visibility: 20 miles, hazy
6-hr Max temp: 64F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.
BHO SA 1155 5 SCT E70 BKN 20 226/64/61/1704/020/ HAZY WND LGT/
8/580 50006 10064 20061

10 A.M.
Weather: Thin broken cirrus, few stratocumulus/cumulus distant
all quadrants, few altocumulus/altocumulus castellanus distant
N-E
Temperature: 73F; Dew Point: 59F; Relative Humidity: 61%
Wind: SSE at 6 kts
Sea-level pressure: 30.17 ins. Hg: falling, then more rapidly
Visibility: 50 miles, hazy
3-hr Precip:  0.00 ins.
BHO SA 1455 E250 –BKN 50 218/73/59/1606/017/ FEW SC/CU DSNT ALQDS
FEW AC/ACC N-E HAZY/ 8/581 58008

1 P.M.
Weather: Broken dense cirrus, thin broken cirrus,
few stratocumulus/cumulus distant SE and N, few altocumulus/
altocumulus castellanus distant S-W-NW
Temperature: 78F; Dew Point: 52F; Relative Humidity: 41%
Wind: S at 12G19 kts
Sea-level pressure: 30.16 ins. Hg: falling, then steady
Visibility: 60 miles
6-hr Max temp: 78F
6-hr Min temp: 64F
6-hr Precip:  0.00 ins.
BHO SA 1755 E250 BKN 300 –BKN 60 212/78/52/1812G19/016/ FEW SC/CU
DSNT SE AND N FEW AC/ACC DSNT S-W-NW/ 8/584 56006 10078 20064

SUMMARY FOR MONDAY, JULY 6, 2020

TEMPERATURE (DEGREES F)
MAX…..73   NORMAL…..80
MIN…..60   NORMAL…..62
MEAN….67   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL…………….. -4
TOTAL DEPARTURE FOR THE MONTH…………….. -3 [-0.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………………2  DEPARTURE……. -5
TOTAL COOLING UNITS FOR THE MONTH……………..31  DEPARTURE……..-6
TOTAL COOLING UNITS FOR THE SEASON………….. 215  DEPARTURE…….+49
TOTAL COOLING UNITS LAST SEASON TO DATE……….159  DEPARTURE…….+56

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..20 ENE AT 12:09 P.M.
AERO…………………….16 NNE AT  7:31 A.M.
ASOS…………………….19 ENE AT  2:51 P.M.
DAVIS……………………19 E   AT 12:09 P.M RMY 18
FASTEST MILE FOR YESTERDAY………………….13 ENE AT  3:35 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 ENE AT  2:58 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14 E   AT  2:58 P.M.
AVERAGE WIND SPEED AND DIRECTION……………7.3 ENE
ASOS……………………7.6
DAVIS…………………..7.9 E [088 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.55  DEPARTURE……-0.10
ASOS…………..0.55
TOTAL PRECIPITATION FOR THE YEAR……….27.90  DEPARTURE……+0.28
ASOS………….28.56

PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

06/01  64/42/53/-9/T/0.0/724/80            28 WNW  AERO 29 WNW RMY 28
06/02  72/45/59/-3/…./0.0/689/76         28 W    AERO 27 W   RMY 28
06/03  79/55/67/+5/T/0.0/400/44            29 W    AERO 28 W   RMY 26
06/04  87/62/75/+12/…./0.0/673/74        26 W    AERO 25 S   RMY N/A
06/05  80/65/73/+10/…./0.0/300/33        28 SSW  AERO 28 SSW RMY N/A TSTM
06/06  86/57/72/+9/…./0.0/301/33         55 SW   AERO 59 SW  RMY 59  TSTM
06/07  68/54/61/-3/0.00/0.0/255/28         24 NW   AERO 24 NW  RMY N/A
06/08  77/51/64/0/0.00/0.0/866/95          25 W    AERO 24 W   RMY 25
06/09  77/60/69/+5/T/0.0/110/12            23 E    AERO 21 E   RMY N/A
06/10  70/58/64/-1/T/0.0/658/72            25 E    AERO 24 E   RMY N/A
06/11  71/64/68/+3/0.62/0.0/165/18         40 S    AERO 40 S   RMY 42
06/12  82/63/73/+8/0.00/0.0/705/77         26 W    AERO 25 W   RMY 27
06/13  71/53/62/-3/0.00/0.0/669/73         21 WNW  AERO 20 WNW RMY N/A
06/14  67/49/58/-8/0.00/0.0/852/93         21 E    AERO 21 ENE RMY 21
06/15  67/53/60/-6/5/0/0.0/696/76          21 NE   AERO 16 ENE RMY 20
06/16  73/54/64/-2/0.00/0.0/889/97         18 E    AERO 18 E   RMY 18
06/17  78/57/68/+1/0.00/0.0/889/97         20 S    AERO 20 S   RMY 20
06/18  86/59/73/+6/0.00/0.0/715/78         22 S    AERO 22 SSW RMY 22
06/19  86/66/76/+9/0.00/0.0/789/86         22 S    AERO 22 S   RMY 21
06/20  90/65/78/+10/0.00/0.0/834/91        22 S    AERO 21 S   RMY 21
06/21  90/66/78/+10/0.83/0.0/514/56        33 ESE  AERO 35 ESE RMY 33  TSTM
06/22  77/65/71/+3/0.00/0.0/761/83         15 E    AERO 17 S   RMY 14
06/23  85/65/75/+7/0.00/0.0/431/47         27 S    AERO 24 S   RMY 26
06/24  84/66/75/+6/0.00/0.0/348/38         25 S    AERO 24 S   RMY 25
06/25  84/63/74/+5/0.00/0.0/806/88         29 W    AERO 29 W   RMY 29
06/26  83/65/74/+5/0.02/0.0/769/84         25 S    AERO 25 S   RMY 27
06/27  82/65/74/+5/0.05/0.0/330/36         21 S    AERO 20 S   RMY 20
06/28  84/62/73/+3/3.27/0.0/421/46         35 W    AERO 33 N   RMY 37  TSTM
06/29  71/61/66/-4/…./0.0/064/07         18 NE   AERO 18 NE  RMY 18  TSTM
06/30  68/62/65/-5/…./…/027/03         14 ENE  AERO 14 ENE RMY 13

Record rainfall on the 28th of 3.27″. Old record 2.09″ in 1938

PRELIMINARY CLIMATE SUMMARY FOR JULY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

07/01  76/63/70/0/0.00/…/…/..          16 E    AERO 14 E   RMY 14  TSTM
07/02  86/61/74/4/0.00/…/…/..          30 WSW  AERO 25 WSW RMY 33
07/03  73/60/67/-4/0.00/…/…/..         30 NE   AERO 28 NE  RMY 30
07/04  79/60/70/-1/0.00/…/..             16 S    AERO 16 S   RMY 16
07/05  83/63/73/+2/0.54/…/..             24 NW   AERO 30 NW  RMY 26  TSTM
07/06  73/60/67/-4/0.00/…/..             20 ENE  AERO 16 NNE RMY 18

07/07 The low since midnight is 60F, the daily normal low is 62F

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

RECORDS FOR JULY 7
HIGH 97F IN 1908,1993
LOW 48F IN 1902
PRECIP 2.11 INS IN 1966
PEAK GUST 55 MPH NW IN 1989

RECORDS FOR JULY 8
HIGH 95F IN 1981
LOW 50F IN 1919
PRECIP 1.74 INS IN 1916
PEAK GUST 46e SSW IN 1941

TODAY’S REPORT PREPARED BY: Matt Douglas

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