Saturday, August 10, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, AUGUST 10, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A FAIR WEATHER DAY WITH EXCELLENT
VISIBILITY AND INCREASING AFTERNOON
CLOUDS….

We observed excellent visibly throughout
the day, with 80 miles on average being
seen. Wind has remained westerly, blowing
at an average speed of 15 mph. The peak
gust so far today is 28 mph. Today started
clear, but the weather became mostly cloudy
as the day went on. Conditions were dry,
with temperatures being cool for late summer.
The high so far today is 77F, 3 degrees below
the daily normal maximum of 80F. The low since
midnight is 60F, 3 degrees below the average
daily minimum of 63F.

PRELIMINARY STATS FOR JULY 2019

TEMPERATURE, Deg. F
Avg. Max. 84.6 [+3.8] Avg. Min. 65.6 [+2.7] Mean      75.1 [+3.2] 24-hour corrected mean: 74.5
Max. for month: 93F on the 20th, 30th
Min. for month: 58F on the 1st, 23rd

COOLING DEGREE DAYS
Total cooling units:   322 [+100] Total for the season:  411 [+60] Total for last season: 455

PRECIPITATION, Inches
Total: 5.45 [+1.43] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 8.8
Avg. corrected wind speed:   9.6
Prevailing wind direction: W at 14%
Peak gust and direction: 44 W on 17th

SUNSHINE:
Campbell-Stokes card minutes: 18300 minutes of possible 26682 or 69%
Astronomical total minutes: 19049 minutes of possible 27759 or 69%

Today’s Observations:

7 A.M.
Weather: Few cumulus
Temperature: 64F; Dew Point: 56F; Wind: W at 12 kts
Sea-level pressure: 29.77 ins. Hg, rising, then steady
Visibility: 85 miles
6-hr Max temp: 64F
6-hr Min temp: 60F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 85 081/64/56/2712/977/ FEW CU ALQDS/ 8/100
53006 10064 20060

10 A.M.
Weather: Scattered cumulus and cirrostratus
Temperature: 73F; Dew Point: 55F; Wind: W at 10G18 kts
Sea-level pressure: 29.76 ins. Hg, steady, then falling
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT 250 SCT 85 079/73/55/2810G18/976/ 8/105
58002

1 P.M.
Weather: Broken cumulus
Temperature: 76F; Dew Point: 53F; Wind: W at 15G20 kts
Sea-level pressure: 29.74 ins. Hg, falling, then steady
Visibility: 75 miles
6-hr Max temp: 77F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins.
BHO SA 1755 E50 BKN 75 072/76/53/2815G20/974/ 8/100
58007 10077 20064

SUMMARY FOR FRIDAY, AUGUST 9, 2019

TEMPERATURE (DEGREES F)
MAX…..82   NORMAL…..80
MIN…..63   NORMAL…..63
MEAN….73   NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL………………….+1
TOTAL DEPARTURE FOR THE MONTH…………………+13 [+1.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8   DEPARTURE………+1
TOTAL COOLING UNITS FOR THE MONTH…………..76   DEPARTURE……..+12
TOTAL COOLING UNITS FOR THE SEASON…………487   DEPARTURE……..+72
TOTAL COOLING UNITS LAST SEASON TO DATE…….585   DEPARTURE……..-98

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..28 NW  AT  11:48 A.M.
AERO…………………….25 NW  AT  11:56 A.M.
ASOS…………………….27 WNW AT  11:48 A.M.
DAVIS……………………27 W   AT  11:41 A.M. RMY 26
FASTEST MILE FOR YESTERDAY………………….19 NW  AT  11:52 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 W   AT   1:35 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 WNW AT  11:51 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.9 WNW
ASOS…………………..10.5
DAVIS………………….11.6 W [266 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.78  DEPARTURE……-0.55
ASOS…………..0.81
TOTAL PRECIPITATION FOR THE YEAR……….36.10  DEPARTURE……+3.78
ASOS………….36.09

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/+1/0.00/896/98               21 NNW AERO 21 NNW RMY N/A
07/02 82/65/74/+4/0.00/329/36               23 W   AERO 23 W   RMY 23
07/03 89/67/78/+7/0.00/866/95               18 S   AERO 18 S   RMY 18
07/04 88/68/78/+7/0.00/748/82               17 SSW AERO M  M   RMY 17
07/05 87/69/78/+7/0.00/829/91               21 SW  AERO M  M   RMY 21
07/06 90/71/81/+10/0.83/646/71              26 WNW AERO M  M   RMY N/A TSTM
07/07 78/64/71/0/0.00/827/91                30 NE  AERO M  M   RMY N/A
07/08 79/59/69/-3/0.00/763/84               16 N   AERO 18 SSW RMY N/A
07/09 85/61/73/+1/0.00/871/96               18 NW  AERO 16 NW  RMY 18
07/10 88/69/79/+7/0.00/607/67               20 ESE AERO 16 ESE RMY 17
07/11 81/67/74/+2/0.62/000/00               35 S   AERO 33 S   RMY 36
07/12 84/68/76/+4/0.00/316/35               31 WNW AERO 30 WNW RMY 32
07/13 85/65/75/+3/0.00/812/90               21 W   AERO 20 WSW RMY 20
07/14 87/68/78/+6/0.00/702/78               25 W   AERO 21 W   RMY 23
07/15 82/63/73/+1/0.00/791/88               24 WNW AERO 23 WNW RMY 22
07/16 86/65/76/+4/0.00/682/76               23 W   AERO 21 W   RMY 21
07/17 90/70/80/+8/1.32/260/29               44 W   AERO M  M   RMY 47 TSTM
07/18 72/61/67/-5/0.04/000/00               33 NE  AERO 36 NE  RMY 33
07/19 89/61/75/+3/0.00/580/65               24 WSW AERO 26 SW  RMY 25
07/20 93/75/84/+12/0.00/802/90              21 WSW AERO 22 WSW RMY N/A
07/21 92/76/84/+12/0.00/729/82              31 W   AERO 35 W   RMY 31
07/22 81/64/73/+1/1.22/284/32               35 ENE AERO 37 ENE RMY 34
07/23 66/58/62/-10/0.86/009/01              30 NNE AERO 33 NNE RMY 30
07/24 77/60/69/-3/0.01/575/65               14 NE  AERO 15 NE  RMY N/A
07/25 80/61/71/-1/0.00/732/83            17 SSE AERO 23 N   RMY 17
07/26 84/62/73/+1/0.00/730/83               22 SSE AERO 23 SSE RMY 20
07/27 83/64/74/+2/0.00/834/95               21 S   AERO 23 S   RMY 21
07/28 89/64/77/+5/0.00/710/81               25 WSW AERO 36 WSW RMY 26
07/29 89/71/80/+8/0.01/804/92               23 W   AERO 25 W   RMY 21
07/30 93/71/82/+10/0.00/767/88              24 S   AERO 24 S   RMY 23
07/31 90/68/79/+7/0.55/548/63               37 SW  AERO 35 SW  RMY 38 TSTM

DAILY RECORDS FOR JULY 2019

7/20/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F,
BREAKS PREVIOUS RECORD OF 73F SET IN 1977, 2015

7/21/19: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 76F,
BREAKS PREVIOUS RECORD OF 75F SET IN 1991

PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/01   84/66/75/3/0.00/…/..                18 NNW AERO 20 NW  RMY 17
8/02   83/61/72/0/0.00/…/..                18 WSW AERO 18 WSW RMY 18
8/03   84/66/75/+3/0.00/…/..               25 SW  AERO 26 SW  RMY 25
8/04   83/66/75/+3/0.00/…/..               21 NE  AERO 23 SW  RMY 25
8/05   81/58/70/-2/0.00/…/..               20 S   AERO 18 S   RMY 19
8/06   79/63/71/-1/0.00/…/..               15 S   AERO 14 S   RMY 17
8/07   82/66/74/+2/…./…/..               32 SSW AERO 35 SSW RMY 35
8/08   84/67/76/+4/…./…/..               30 SW  AERO 24 WNW RMY 29
8/09   82/63/73/+1/…./…/..               28 NW  AERO 25 NW  RMY 26

8/10 Low temp since midnight is 63F; normal low is 63F

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

RECORDS FOR AUGUST 10
HIGH 101F IN 1949 [STATION RECORD MAXIMUM – Tied with 8/2/1975] LOW 49F IN 1964
PRE 2.27 INS IN 1952
PEAK GUST 88e MPH S IN 1976

RECORDS FOR AUGUST 11
HIGH 97F IN 1944
LOW 49F IN 1972
PRECIP 3.13 INCHES IN 1990
PEAK GUST 44 MPH SW IN 1971

TODAY’S REPORT PREPARED BY: Benjamin Turner