Wednesday, July 10, 2019

| July 10, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 10, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

SEASONABLE WITH DECREASING VISIBILITY AND
A LIGHT WESTERLY WIND….

We observed an increasing haze that brought visibility
from 50 miles this morning to 40 miles this afternoon.
Cloud cover became more significant as the day went on,
becoming overcast with cirrostratus and cumulus following
the 1 P.M. observation. Wind has remained light and
westerly, with an average speed of 8 mph. The high so
far today is 86F, which is 5 degrees above the average
daily maximum of 81F. The low since midnight is 69F, 6
degrees above the daily normal minimum of 63F.

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 ins. 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: Broken cirrus
Temperature: 73F; Dew Point: 59F; Wind: WNW at 6 kts,
Wind: Light
Sea-level pressure: 30.06 ins. Hg, rising steadily
Visibility: 50 miles
6-hr Max temp: 72F
6-hr Min temp: 69F
24-hr Precip: 0.00 ins.
BHO SA 1155 E250 BKN 50 178/73/59/3006/006/ WND LGT/
8/002 53010 10072 20069

10 A.M.
Weather: Broken cirrus
Temperature: 83F; Dew Point: 64F; Wind: W at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.04 ins. Hg, falling steadily
Visibility: 40 miles, distant haze
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 BKN 40 173/83/64/2604/004/ DSNT HZ
ALQDS WND L/V/ 8/002 58005

1 P.M.
Weather: Scattered cumulus, broken cirrus
Temperature: 86F; Dew Point: 60F; Wind: WNW at 9 kts
Sea-level pressure: 30.01 ins. Hg, falling steadily
Visibility: 40 miles, distant haze
6-hr Max temp: 86F
6-hr Min temp: 72F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT E250 BKN 40 164/86/60/2909/001/
DSNT HZ ALQDS/ 8/102 58009 10086 20072

SUMMARY FOR TUESDAY, JULY 9, 2019

TEMPERATURE (DEGREES F)
MAX…..85   NORMAL…..80
MIN…..61   NORMAL…..62
MEAN….73   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….+1
TOTAL DEPARTURE FOR THE MONTH…………………+34 [+3.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8   DEPARTURE………+1
TOTAL COOLING UNITS FOR THE MONTH…………..88   DEPARTURE……..+31
TOTAL COOLING UNITS FOR THE SEASON…………177   DEPARTURE………-9
TOTAL COOLING UNITS LAST SEASON TO DATE…….261   DEPARTURE……..-84

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..18 NW  AT 10:41 A.M.
AERO…………………….16 NW  AT 10:41 A.M.
ASOS…………………….18 NW  AT 10:56 A.M.
DAVIS……………………18 NW  AT 10:27 A.M.  RMY 18
FASTEST MILE FOR YESTERDAY………………….12 NW  AT 11:00 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….14 NW  AT 10:57 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………14 WNW AT 10:57 A.M.
AVERAGE WIND SPEED AND DIRECTION……………7.2 W
ASOS……………………8.6
DAVIS…………………..8.7 WNW [287 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……….0.83  DEPARTURE……-0.17
ASOS…………..0.83
TOTAL PRECIPITATION FOR THE YEAR……….30.70  DEPARTURE……+2.73
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 85/61/73/+1/0.00/…/..               18 NW  AERO 16 NW  RMY 18

07/10 Low temp since midnight is 69F; normal low is 63F

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

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

RECORDS FOR JULY 11
HIGH 98F IN 1911
LOW 49F IN 1890
PRECIP 1.87 INS IN 1959
WIND 53 MPH NW IN 1988

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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