Monday, July 12, 2021

| July 12, 2021 | Reply

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

MONDAY, JULY 12, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0419E
SUNSET:  1921E

ANOTHER WET DAY AS MORE RAIN FALLS ON GREAT BLUE HILL….

Just when you thought we’d get through yesterday without any
rain, guess again. While the light showers yesterday evening
wasn’t measurable, it still continued the theme of every day
so far this July as having seen some rain. As a matter of fact,
the trace yesterday is the only day this month so far without
measurable rainfall!

The quest to the wettest July on record continues as we got
considerably closer to that mark this morning. Rain moved into
to the area between 2am-3am and continued until between 9-10am.
The heaviest of the rain fell between 7am-8am when 0.41″ was
measured for that 1 hour period alone! The total through 7am
was 0.41″ with another 0.60″ falling for the 6 hours following.
The total for the day through 1pm is 1.01″. This brings the
monthly total to 9.89″, which is less than 2 inches from the
record wettest for July.

Here are the rankings for wettest Julys as compiled by our
Chief Scientist, Mike Iacono…

BHO Wettest Julys, inches (1885-2021)

1) 11.67 in 1938
2) 10.68 in 1988
3) 10.43 in 1921
4) 9.52 in 1915
5) 8.47 in 1889
6) 7.62 in 2009
7) 7.55 in 1916

The other story today was the brisk ENE wind which gusted to
31mph this morning. This flow off the ocean along with clouds
and fog have helped to keep the temperature on the cool side,
with the high only getting to the upper 60s!

The high so far today is 67F, 15 degrees below the daily average
of 82F. The low so far today is 62F, 2 degrees below the daily
average of 64F.

On a side note, the renovations have begun in earnest today.
We are no longer operating out of the tower and have moved to
another part of the building. All wind instruments on the main
tower have been taken offline and will remain so until further
notice. Please be patient with us as we navigate through our
new routine. Data at times may be delayed.

———————————————–
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: Sky obscured, vertical visibility 200ft, light rain
Temperature: 65F; Dew Point: 65F; Relative Humidity: 100%
Wind: E @ 6 kts
Sea-level pressure: 30.10 in. Hg; falling, then rising
Visibility: 1/2 mile, fog
6-hr Max temp: 66F
6-hr Min temp: 63F
24-hr Precip: 0.41 ins.
BHO SA 1155 X W2 1/2R-F 193/65/65/0906/010/ 8//// 55006 6041/
70041 10066 20063

10 A.M.
Weather: Sky obscured, vertical visibility 100ft
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: ENE @ 12G23 kts, peak wind 31 mph at 9:31 A.M.
Sea-level pressure: 30.16 in Hg; rising, then more slowly
Visibility: 1/8 mile, fog
3-hr Precip: 0.59 ins.
BHO SA 1455 X W1 1/8F 215/63/63/0612G23/016/ R-E42
PK WND 0627/31/ 8//// 51022 6059/


1 P.M.
Weather: Sky obscured, vertical visibility 200ft, light rain
Temperature: 65F, Dew point: 65F; Relative Humidity: 100%
Wind: ENE @ 5 kts, wind light
Sea-level pressure: 30.23 in Hg; falling, then rising
Visibility: 3/4 mile, fog
6-hr Max temp: 67F
6-hr Min temp: 62F
6-hr Precip: 0.60 ins.
BHO SA 1755 X W2 3/4R-F 237/65/65/0605/023/ R-B30 WND LGT/
8//// 53022 6060/ 10067 20062


SUMMARY FOR SUNDAY, JULY 11, 2021

TEMPERATURE (DEGREES F)
MAX…….81     NORMAL…..82
MIN…….61     NORMAL…..64
MEAN……71     NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-2
TOTAL DEPARTURE FOR THE MONTH…………………-58 [-5.5 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……………23  DEPARTURE…….+20
TOTAL HEATING UNITS FOR THE SEASON…………..23  DEPARTURE…….+20
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE…….+23

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….6  DEPARTURE…….-2
TOTAL COOLING UNITS FOR THE MONTH……………43  DEPARTURE……-38
TOTAL COOLING UNITS FOR THE SEASON………….269  DEPARTURE……+49
TOTAL COOLING UNITS LAST SEASON TO DATE……..268  DEPARTURE…….+1

PEAK WIND GUST (MPH):
                     420C/Official…………..21 SW  @ 1:58 P.M.
                     AEROVANE (south tower)…..19 S   @ 3:10 P.M.
                     VECTOR #2 (south tower)….20     @ 1:58 P.M.
                     DAVIS #2 (south tower)…..20 S   @ 3:10 P.M.
                     ASOS………..OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
                     RMY…………OUT OF SERVICE D/T RENOVATIONS  
                     MERLIN………OUT OF SERVICE D/T RENOVATIONS


FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 SW  @ 1:59 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..14     @ 1:59 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 S   @ 3:06 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE……..OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…….6.5 SSW [157 total miles]
                     VECTOR #2……………..7.5
                     DAVIS #2………………7.2 SW
                     RMY……………..OUT OF SERVICE D/T RENOVATIONS
                     ASOS…………….OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS   

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.41  DEPARTURE….+0.30
TOTAL PRECIPITATION FOR THE MONTH………….9.29  DEPARTURE….+8.08
TOTAL PRECIPITATION FOR THE YEAR………….32.67  DEPARTURE….+4.49
     

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 TSTM
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/+5/0.26/…/..           37 W   AERO 48 W    RMY 38 TSTM
07/07   88/88/77/+5/0.77/…/..           63 NW  AERO 75 NW   RMY 70 TSTM
07/08   67/59/63/-9/0.38/…/..           46 W   AERO 46 W    RMY 51  
07/09   73/62/68/-5/3.02/…/..           40 WNW AERO 44 WNW  RMY 43
07/10   71/63/67/-6/0.07/…/..           23 NE  AERO 21 NNE  RMY 22
07/11   81/61/71/-2/T/…/..              21 SW  AERO 19 S    RMY N/A

07/12   The low since midnight is 62F, the daily normal low is 64F

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

JULY 7: Record peak gust of 63 MPH,
        Surpasses previous record of 55 MPH set in 1989


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

RECORDS FOR JULY 12
HIGH 96F IN 1908
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944

RECORDS FOR JULY 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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