Wednesday, July 7, 2021

| July 7, 2021 | Reply

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

WEDNESDAY, JULY 7, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0415E
SUNSET:  1923E

AFTERNOON THUNDERSTORMS ARE THE MOST NOTABLE AS
THE DAY WAS VERY SIMILAR TO THE ONE BEFORE….

We measured only 0.24 inches of rainfall from last night’s
thunderstorms. That is a surprise considering a lightning
bolt knocked out the main electricity line to the observatory
yesterday evening. Today was very much like the one before 
regarding temperature and humidity.

Visibility has been poor today thanks to haziness. We’ve
only been able to see 15-20 miles.

The wind has been generally out of the southwest, gusting
at times to only 15-20 mph.

Storms have begun to move in from the west, with lightning bolts
being seen through the haze at around 5:39 P.M. EST.  

The high so far today is 87F, 6 degrees above the daily average
of 81F. The low so far today is 66F, 3 degrees above the daily
average of 63F.
 

PRELIMINARY STATS FOR JUNE 2021

TEMPERATURE, Deg. F
Avg. Max. 80.9 [+5.9]
Avg. Min. 60.4 [+3.3]
Mean      70.7 [+4.6]
24-hour corrected mean: 70.0
Max. for month: 95F on the 29th
Min. for month: 50F on the 1st

HEATING DEGREE DAYS
Total heating units:     19 [-54]
Total for the season:  5597 [-725]
Total for last season: 5852

COOLING DEGREE DAYS
Total cooling units:     197 [+92]
Total for the season:    226 [+97]
Total for last season:   184

PRECIPITATION, Inches
Total: 2.72 [-1.59]
Greatest in 24 hrs: 0.68 inches on the 22nd

WIND, mph
Avg. uncorrected wind speed: 10.4 mph
Avg. corrected wind speed:   10.9 mph
Prevailing wind direction:   SSW [22%]
Peak gust and direction:     51 NW on the 30th

SUNSHINE:
Campbell-Stokes card minutes: 16230 minutes of a possible 26376 or 62%
Astronomical total minutes: 16866 minutes of a possible 27415 or 62%

 

Today’s Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 71F; Dew Point: 67F; Relative Humidity: 87%
Wind: W @ 11G15 kts
Sea-level pressure: 29.93 in. Hg; rising steadily
Visibility: 20 miles, hazy
6-hr Max temp: 71F
6-hr Min temp: 66F
24-hr Precip: 0.24 ins.
BHO SA 1155 250 SCT 20 137/71/67/2711G15/993/ HAZY/ 8/001
70024 53009 10071 20066

10 A.M.
Weather: Scattered cirrus, few cumulus
Temperature: 81F; Dew Point: 70F; Relative Humidity: 69%
Wind: SSW @ 8G10 kts
Sea-level pressure: 29.94 in Hg; falling then rising
Visibility: 20 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 20 141/81/70/2008G10/994/ FEW CU ALQDS
HAZY/ 8/101 51004


1 P.M.
Weather: Scattered building cumulus, broken cirrus
Temperature: 85F, Dew point: 71F; Relative Humidity: 63%
Wind: WNW @ 7G12 kts
Sea-level pressure: 29.92 in Hg; falling steadily
Visibility: 20 miles, hazy
6-hr Max temp: 87F
6-hr Min temp: 71F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 250 BKN 20 135/85/71/2907G12/992/ HAZY/ 8/201
58006 10087 20071


SUMMARY FOR TUESDAY, JULY 6, 2021

TEMPERATURE (DEGREES F)
MAX…….87     NORMAL…..81
MIN…….66     NORMAL…..63
MEAN……77     NORMAL…..72

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……… +5
TOTAL DEPARTURE FOR THE MONTH…………………-41 [-7.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……. 0
TOTAL HEATING UNITS FOR THE MONTH……………21  DEPARTURE…….+19
TOTAL HEATING UNITS FOR THE SEASON…………..21  DEPARTURE…….+19
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE…….+21

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY……………12  DEPARTURE…….+5
TOTAL COOLING UNITS FOR THE MONTH……………20  DEPARTURE……-22
TOTAL COOLING UNITS FOR THE SEASON………….246  DEPARTURE……+65
TOTAL COOLING UNITS LAST SEASON TO DATE……..215  DEPARTURE……+31

PEAK WIND GUST (MPH):
                     420C/Official…………..37 W   @  5:25 P.M.
                     AEROVANE (south tower)…..48 W   @  5:23 P.M.
                     ASOS…………OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1………………37     @  5:25 P.M.
                     VECTOR #2 (south tower)….50     @  5:24 P.M.
                     DAVIS #1……………….37 WSW @  5:25 P.M.
                     DAVIS #2 (south tower)…..41 W   @  5:24 P.M.
                     RMY……………………38     @  5:24 P.M.
                     MERLIN…………………37

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 W   @  5:24 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..27     @  5:30 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 W   @  5:30 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………27 W   @  5:25 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..27 W   @  5:30 P.M.

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……13.9 SW  [334 total miles]
                     ASOS…………………OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1…………….14.2
                     DAVIS #1……………..14.2 WSW
                     DAVIS #2……………..14.4 SW
                     RMY………………….13.6 SW

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.24  DEPARTURE….+0.13
TOTAL PRECIPITATION FOR THE MONTH………….4.64  DEPARTURE….+3.97
TOTAL PRECIPITATION FOR THE YEAR………….28.02  DEPARTURE….+0.38
     


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   74/50/62/0/0.00/425/47            20 WSW  AERO 24 WSW  RMY 22
06/02   80/55/68/+6/0.00/553/61           28 S    AERO 25 S    RMY 28
06/03   73/56/65/+3/0.01/073/08           29 SSW  AERO 29 SSW  RMY 29
06/04   77/61/69/+6/0.02/054/06           23 SW   AERO 25 WSW  RMY 25 TSTM
06/05   87/60/74/+11/0.00/801/88          32 SSW  AERO 37 SSW  RMY 35
06/06   91/69/80/+17/0.00/819/90          30 WSW  AERO 31 WSW  RMY 32
06/07   92/69/81/+17/0.00/838/92          31 SSW  AERO 35 SSW  RMY 34
06/08   92/69/81/+17/0.06/456/50          24 WSW  AERO 25 WSW  RMY 27 TSTM
06/09   88/70/79/+15/0.02/530/58          21 N    AERO 23 NNW  RMY 23
06/10   70/53/62/-3/0.00/795/87           28 NE   AERO 28 NE   RMY 28
06/11   70/51/61/-4/0.13/411/45           21 SSE  AERO 22 SSE  RMY 22
06/12   72/53/63/-2/0.43/430/47           20 WSW  AERO 18 WSW  RMY 20
06/13   82/56/69/+4/0.00/860/94           26 SSW  AERO 29 SSW  RMY 29
06/14   65/56/61/-5/0.63/027/03           28 S    AERO 30 SSE  RMY 29
06/15   77/61/69/+3/T/357/39              18 NE   AERO 20 NE   RMY 18 TSTM
06/16   73/56/65/-1/0.00/769/84           27 NNW  AERO 31 NNW  RMY 27
06/17   77/52/65/-2/0.00/880/96           21 WNW  AERO 21 NW   RMY 23
06/18   82/56/69/+2/T/789/86              26 WSW  AERO 28 WSW  RMY 30
06/19   86/63/75/+8/0.09/504/55           30 SW   AERO 32 SW   RMY 32
06/20   85/63/74/+6/0.00/816/89           24 S    AERO 25 SSW  RMY 25
06/21   83/65/74/+6/0.00/514/56           37 SSW  AERO 39 SSW  RMY 39
06/22   84/58/71/+3/0.68/229/25           30 NW   AERO 31 NW   RMY 31 TSTM
06/23   73/52/63/-5/0.00/807/88           25 NW   AERO 24 NW   RMY 26
06/24   76/58/67/-2/T/899/98              25 SE   AERO 24 SE   RMY 25
06/25   71/57/64/-5/0.11/046/05           23 S    AERO 23 S    RMY 23
06/26   81/61/71/+2/0.00/376/41           36 SSW  AERO 37 SSW  RMY 38
06/27   85/70/78/+9/0.00/476/52           38 SW   AERO 39 SW   RMY 42
06/28   93/70/82/+12/0.00/851/93          28 SW   AERO 28 SW   RMY 28
06/29   95/73/84/+14/T/750/82             26 W    AERO 30 W    RMY 27 TSTM
06/30   94/69/82/+12/0.54/731/80          51 NW   AERO 53 NW   RMY 56 TSTM

RECORDS FOR JUNE:
JUNE 7: Record high minimum temperature of 69F,
        Surpasses previous record of 66F set in 1922 and 1953

JUNE 29: Record high maximum temperature of 95F,
        Surpasses previous record of 94F set in 1933

JUNE 29: Record high minimum temperature of 73F,
        Surpasses previous record of 71F set in 1999

JUNE 30: Record high maximum temperature of 94F,
        Ties previous record of 94F set in 1964


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   80/65/73/+2/0.74/…/..           22 W   AERO 20 WSW   RMY 21
07/02   65/55/60/-11/1.49/…/..          37 NE  AERO 36 NE    RMY 39
07/03   56/54/55/-17/1.98/…/..          41 NE  AERO 44 NE    RMY 45
07/04   66/54/60/-12/0.16/…/..          26 ENE AERO 23 ENE   RMY 26
07/05   74/53/64/-8/0.01/…/..           26 SSW AERO 28 SSW   RMY 27
07/06   87/66/77/+5/0.24/…/..           37 W   AERO 48 W     RMY 38 TSTM

07/07 The low since midnight is 66F, the daily normal low is 63F

RECORDS FOR JULY:
JULY 2: Record daily precipitation of 1.49″,
        Surpasses previous record of 1.42″ set in 1986

JULY 3: Record daily precipitation of 1.98″,
        Surpasses previous record of 1.36″ set in 1985


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: Benjamin Turner

Category: Daily Discussions

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