Tuesday, July 9, 2019

| July 9, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 9, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A SLIGHTLY WARMER DAY WITH LIGHT AND
VARIABLE WINDS ATOP GREAT BLUE HILL….

We observed around 70 miles of visibility throughout
the day, with conditions gradually drying. By
1 P.M., humidity was down to around 30%. Today
we had abundant sunshine with wind speeds well
below 10 mph. A slight wind shift from north to
west has been observed. The high so far today is 85F,
which is 5 degrees above the average daily maximum of
80F. The low since midnight is 61F, a degree below the
daily normal minimum of 62F.

PRELIMINARY STATS FOR JUNE 2019

TEMPERATURE, Deg. F
Avg. Max. 75.1 [+0.1]
Avg. Min. 57.3 [+0.2]
Mean      66.2 [+0.1]
24-hour corrected mean: 66.0
Max. for month: 88F on the 28th
Min. for month: 45F on the 4th

COOLING DEGREE DAYS
Total cooling units:    81 [-24]
Total for the season:   89 [-40]
Total for last season: 159

HEATING DEGREE DAYS
Total cooling units:     36  [-37]
Total for the season:  6254 [-122]
Total for last season: 5916

PRECIPITATION, Inches
Total: 4.08 [-0.23]
Greatest in 24 hrs: 1.30 on the 10th-11th

WIND, mph
Avg. uncorrected wind speed: 9.9
Avg. corrected wind speed: 10.5
Prevailing wind direction: S at 17%
Peak gust and direction: 41 W on 3rd

SUNSHINE:
Campbell-Stokes card minutes: 14118 minutes of possible 26376 or 54%
Astronomical total minutes:   14674 minutes of possible 27416 or 54%

Today’s Observations:

7 A.M.
Weather: Scattered cirrus
Temperature: 68F; Dew Point: 57F; Wind: NNW at 8 kts
Sea-level pressure: 30.02 ins. Hg, rising steadily
Visibility: 75 miles
6-hr Max temp: 68F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 75 166/68/57/3408/002/ 8/002
51012 10068 20061

10 A.M.
Weather: Broken cirrus
Temperature: 79F; Dew Point: 53F; Wind: NW at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.03 ins. Hg, falling then rising
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 BKN 75 169/79/53/3203/003/ WND L/V/
8/002 51003

1 P.M.
Weather: Scattered cirrus, few altostratus
Temperature: 83F; Dew Point: 50F; Wind: W at 2 kts,
Wind: Light and variable
Sea-level pressure: 30.01 ins. Hg, falling steadily
Visibility: 65 miles
6-hr Max temp: 85F
6-hr Min temp: 68F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 65 162/83/50/2802/001/ FEW AS ALQDS
WND L/V/ 8/011 58007 10085 20068

SUMMARY FOR MONDAY, JULY 8, 2019

TEMPERATURE (DEGREES F)
MAX…..79   NORMAL…..80
MIN…..59   NORMAL…..63
MEAN….69   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….-3
TOTAL DEPARTURE FOR THE MONTH…………………+33 [+3.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4   DEPARTURE………-3
TOTAL COOLING UNITS FOR THE MONTH…………..80   DEPARTURE……..+29
TOTAL COOLING UNITS FOR THE SEASON…………169   DEPARTURE……..-11
TOTAL COOLING UNITS LAST SEASON TO DATE…….252   DEPARTURE……..-83

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..16 N   AT  4:53 A.M.
AERO…………………….18 SSW AT 10:40 P.M.
ASOS…………………….16 N   AT  5:01 A.M.
DAVIS……………………17 NNE AT  3:37 A.M.  RMY N/A
FASTEST MILE FOR YESTERDAY………………….14 N   AT  4:57 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 NNE AT  4:57 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………13 N   AT  3:39 A.M.
AVERAGE WIND SPEED AND DIRECTION……………6.4 NE
ASOS……………………7.4
DAVIS…………………..6.9 NE [48 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.83  DEPARTURE……-0.06
ASOS…………..0.83
TOTAL PRECIPITATION FOR THE YEAR……….30.70  DEPARTURE……+2.84
ASOS………….30.60

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 71/54/63/+1/0.00/551/61               21 E   AERO 20 E   RMY 18
06/02 75/51/63/+1/0.02/417/46               23 S   AERO 21 S   RMY N/A
06/03 69/50/60/-2/0.02/753/83               41 W   AERO 39 W   RMY 43
06/04 70/45/58/-5/0.00/717/79               29 W   AERO 23 W   RMY N/A
06/05 81/57/69/+6/0.03/527/58               33 SSW AERO 33 SSW RMY N/A
06/06 75/64/70/+6/0.06/428/47               28 SSW AERO 28 SSW RMY N/A
06/07 80/59/70/+6/0.00/692/76               23 S   AERO 23 S   RMY 22
06/08 78/57/68/+4/0.00/885/97               23 ENE AERO 21 SW  RMY 21
06/09 78/55/67/+3/0.00/840/93               22 S   AERO 21 S   RMY 21
06/10 79/54/67/+2/0.29/712/78               26 SSE AERO 25 SSE RMY 33
06/11 73/58/66/+1/1.03/247/27               32 NW  AERO 30 NW  RMY 35
06/12 75/52/64/-1/0.00/869/95               25 SSW AERO 25 S   RMY 28
06/13 55/49/52/-13/0.81/000/00              36 NE  AERO 35 NE  RMY 35
06/14 72/50/61/-5/0.00/540/59               38 W   AERO 39 W   RMY 38
06/15 79/54/67/+1/0.00/879/96               38 SSW AERO 41 SSW RMY 40
06/16 70/62/66/0/0.13/000/00                32 SW  AERO 35 SW  RMY N/A
06/17 74/62/68/+1/0.00/348/38               12 SSE AERO 18 NW  RMY 17
06/18 71/62/67/0/0.10/000/00                17*S   AERO 17 S   RMY 16
06/19 74/61/68/+1/0.00/101/11               16 SSE AERO 20 SSE RMY 19
06/20 69/61/65/-3/0.26/000/00               26 S   AERO 26 S   RMY 29
06/21 68/58/63/-5/0.75/018/02               32 NW  AERO 28 NW  RMY 33
06/22 77/56/67/-1/T/779/85                  33 NW  AERO 32 NW  RMY 35
06/23 82/59/71/+3/0.00/871/95               30 NW  AERO 25 WNW RMY 29
06/24 84/61/73/+4/0.00/779/85               22 NW  AERO 21 NW  RMY 22
06/25 73/61/67/-2/0.18/083/09               35 S   AERO 37 S   RMY 37
06/26 77/64/71/+2/0.00/559/61               12 ENE AERO 18 SE  RMY N/A
06/27 81/57/69/0/0.00/614/67                21 NE  AERO 18 NE  RMY N/A
06/28 88/64/76/+6/0.00/870/95               16 SW  AERO 18 SW  RMY N/A
06/29 80/66/73/+3/0.29/165/18               25 W   AERO 25 W   RMY 26
06/30 75/59/67/-3/0.13/430/47               31 N   AERO 30 N   RMY 35

*Estimated

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 83/58/71/+1/0.00/…/..               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/…/..               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/…/..               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/…/..               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/…/..               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/…/..              26 WNW AERO M  M   RMY N/A
07/07 78/64/71/0/0.00/…/..                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/…/..               16 N   AERO 18 SSW RMY N/A

07/09 Low temp since midnight is 61F; normal low is 63F

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

RECORDS FOR JULY 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992

RECORDS FOR JULY 10
HIGH 99F IN 1911
LOW 46F IN 1890
PRECIP 1.95 INS IN 2015
WIND 75 MPH W IN 1985

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

Leave a Reply