Monday, July 2, 2018

| July 2, 2018 |

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 2, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

MILDER THAN YESTERDAY BUT STILL ANOTHER HAZY, HOT,
AND HUMID DAY ATOP GREAT BLUE HILL…

Temperatures continue to be well above normal after two
days of high temperatures 90F or above. Yesterday’s max
temperature of 94F was 4 degrees shy of the record of 98F
set in 1964. Yesterday’s minimum temperature of 72F ties
for a record high minimum originally set in 1968.
Temperatures have been lower today than the past couple of
days with a max so far of 85F, this is still 6F degrees
above the daily normal of 79F. The wind has been light,
from the ESE, and shifted at midday to coming from the NE.
This allowed for a still light but cooler breeze giving a
mild relief from the heat.
The sky was clear and cloudless in the morning and a few
cumulus clouds formed in the afternoon. A thick distant
haze lingered in the area limiting visibility to 40-30
miles at each observation. Humidity was still high today
with dew points close to 70 for most of the day.

PRELIMINARY STATS FOR JUNE 2018

TEMPERATURE, Deg. F
Avg. Max. 75.1 [+0.1]
Avg. Min. 56.2 [-0.9]
Mean      65.7 [-0.5]
24-hour corrected mean: 65.7
Max. for month: 90F on  30th
Min. for month: 45F on  3rd and 4th

HEATING DEGREE DAYS
Total heating units:   69     [-4]
Total for the season:  5916 [-460]
Total for last season: 5725

COOLING DEGREE DAYS
Total cooling units:    97  [-8]
Total for the season:  159 [+30]
Total for last season: 201

PRECIPITATION, Inches
Total: 2.85 [-1.46]
Greatest in 24 hrs: 1.29 in on 27th-28th

WIND, mph
Avg. uncorrected wind speed: 10.3
Avg. corrected wind speed: 10.8
Prevailing wind direction: SSW at 30%
Peak gust and direction: 37 SW on 12th

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today’s Observations:

7 A.M.
Weather: Sky clear
Temperature: 75F; Dew Point: 68F; Wind: SE at 3 kts,
Wind: Light
Sea-level pressure: 30.11 ins. Hg, rising then falling
Visibility: 40 miles, distant haze
6-hr Max temp: 75F
6-hr Min temp: 68F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 40 198/75/68/1303/011/ SKC DSNT HZ WND LGT/
50004 10075 20068

10 A.M.
Weather: Sky clear
Temperature: 83F; Dew Point: 71F; Wind: estimated E at 4 kts,
Wind: Light and Variable
Sea-level pressure: 30.12 ins. Hg, rising then falling
Visibility: 30 miles, distant haze
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 30 201/83/71/E0904/012/ SKC DSNT HZ WND L/V/
50005

1 P.M.
Weather: Clear, few cumulus E-W
Temperature: 82F; Dew Point: 69F; Wind: ENE at 6 kts,
Wind: Light
Sea-level pressure: 30.11 ins. Hg, falling, then more quickly
Visibility: 30 miles, distant haze
6-hr Max temp: 85F
6-hr Min temp: 75F
6-hr precip: 0.00 ins.
BHO SA 1755 CLR 30 198/82/69/0706/011/ FEW CU E-W DSNT
HZ WND LGT/ 8/100 58005 10085 20075

SUMMARY FOR SUNDAY, JULY 1, 2018

TEMPERATURE (DEGREES F)
MAX…..94   NORMAL…..79
MIN…..72   NORMAL…..61
MEAN….83   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL……………………+13
TOTAL DEPARTURE FOR THE MONTH……………………+13 [+12.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..18   DEPARTURE………+12
TOTAL COOLING UNITS FOR THE MONTH…………..18   DEPARTURE………+12
TOTAL COOLING UNITS FOR THE SEASON…………159   DEPARTURE………+42
TOTAL COOLING UNITS LAST SEASON TO DATE…….201   DEPARTURE………-35

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..21 ESE AT 5:34 P.M.
AERO…………………….18 ESE AT 5:30 P.M.*
ASOS…………………….20 ESE AT 5:31 P.M.
DAVIS……………………19 M   AT 4:26 P.M.** RMY 18
FASTEST MILE FOR YESTERDAY………………….15 ESE AT 5:17 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 ESE AT 5:31 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 M   AT 4:39 P.M.**
AVERAGE WIND SPEED AND DIRECTION……………9.0 ESE
ASOS……………………9.0
DAVIS…………………..8.7
*Last of several occurrences
**Davis direction malfunctioning

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……….0.00  DEPARTURE……-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE YEAR……….30.17  DEPARTURE……+3.27
ASOS………….31.73

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

6/01 78/62/70/+8/T/009/01            21 S   AERO 21 S   RMY N/A
6/02 79/54/67/+5/T/353/39            26 ENE AERO 25 ENE RMY 27
6/03 59/45/52/-10/0.00/816/90        28 ENE AERO 25 ENE RMY N/A
6/04 52/45/49/-14/0.82/000/00        29 ENE AERO 26 ENE RMY 29
6/05 64/47/56/-7/0.19/173/19         24 N   AERO 21 N   RMY 23  TSTM
6/06 66/50/58/-5/0.00/373/41         23 S   AERO 21 S   RMY 22
6/07 69/50/60/-4/0.00/282/31         25 S   AERO 25 S   RMY 27
6/08 79/52/66/+2/0.00/684/75         20 SW  AERO 17 SW  RMY 18
6/09 79/58/69/+5/0.00/767/84         22 W   AERO 21 W   RMY 22
6/10 72/56/64/-1/0.00/593/65         20 S   AERO 18 S   RMY 17
6/11 68/51/60/-5/0.00/594/65         21 ENE AERO 20 SSW RMY N/A
6/12 77/49/63/-2/0.00/814/89         37 SW  AERO 37 SW  RMY 39
6/13 74/56/65/0/T/284/31             35 SW  AERO 36 SW  RMY 36
6/14 77/61/69/+3/0.00/495/54         35 W   AERO 36 WNW RMY 37
6/15 68/53/61/-5/0.01/266/29         17 NNW AERO 16 WNW RMY 19
6/16 83/54/69/+3/0.00/761/83         25 NNW AERO 24 NNW RMY 25
6/17 86/63/75/+8/0.00/807/88         23 S   AERO 22 S   RMY N/A
6/18 86/64/75/+8/0.10/284/31         37 SSW AERO 37 SSW RMY 40  TSTM
6/19 81/64/73/+6/0.01/789/86         31 WSW AERO 32 WSW RMY 32
6/20 81/58/70/+2/0.00/459/50         22 W   AERO 21 W   RMY 23
6/21 81/62/72/+4/0.00/706/77         22 E   AERO 18 E   RMY 21
6/22 75/56/66/-2/0.00/688/75         24 ESE AERO 22 ESE RMY 24
6/23 65/55/60/-8/0.03/000/00         22 ENE AERO 21 NE  RMY 22
6/24 78/56/67/-2/0.26/009/01         21 SSW AERO 20 SSW RMY N/A
6/25 70/56/63/-6/0.14/449/49         30 N   AERO 29 N   RMY 31  TSTM
6/26 79/53/66/-3/0.00/824/90         24 SSW AERO 24 SSW RMY 25
6/27 78/59/69/0/0.13/…/..          26 S   AERO 28 S   RMY N/A
6/28 71/63/67/-3/1.16/000/00         28 S   AERO 26 S   RMY N/A TSTM
6/29 87/66/77/+7/0.00/…/..         18 W   AERO 16 W   RMY 18
6/30 90/69/80/+10/0.00/…/..        21 SSW AERO 20 SSW RMY 21

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

7/01 94/72/83/+13/0.00/…/..       21 ESE AERO 18 ESE RMY 19

7/02 Low temp since midnight is 68F; normal low is now 62F

DAILY RECORDS FOR JULY 2018

07/01/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 72F,
TIES PREVIOUS RECORD OF 72F SET IN 1968

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

RECORDS FOR JULY 2
HIGH 95F IN 1963
LOW 47F IN 1988
PRECIP 1.42 INS IN 1986
PEAK GUST 45 MPH SW IN 1999

RECORDS FOR JULY 3
HIGH 99F IN 1911
LOW 47F IN 1914
PRECIP 1.36 IN 1985
PEAK GUST 52 MPH NW IN 1963

TODAY’S REPORT PREPARED BY: Kaitlin Geagan

 

Category: Daily Discussions

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