Saturday, September 1, 2018

| September 2, 2018 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 1, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY FAIR WEATHER ON TOP OF GREAT BLUE HILL…
A VERY WARM AUGUST FINISHES AS SECOND WARMEST ON RECORD…

Temperatures remained below normal again today,
with a high so far of 75F, 2 degrees lower than
our normal high of 77F, and our lowest temperature
since midnight being 58F, 1 degree lower than our
normal low of 59F. Humidity decreased throughout
the day from 76% at our 7:00 A.M. observation to
58% at our 1:00 P.M. observation. Visibility
remained consistent at 40 miles with a lingering
distant haze.

With a 24-hour adjusted mean temperature of 73.4 degrees F,
August was the second warmest on record. The average maximum
tied for the eighth warmest, and the average maximum temperature
of 66.3 deg F was the warmest on record by more than a degree F.

BHO Warmest August 24-hour Adjusted Mean Temperature, deg F (1885-2018):

1) 74.1 in 2016
2) 73.4 in 2018
3) 72.6 in 2012
4) 72.5 in 1988
5) 72.4 in 2015

BHO Warmest August Average Maximum Temperature, deg F (1885-2018):

1) 85.1 in 2016
2) 83.2 in 2005
3) 83.1 in 1949
4) 82.6 in 2015
5) 82,5 in 1988
82.5 in 2002
82.5 in 2012
8) 82.4 in 1944
82.4 in 2018

BHO Warmest August Average Minimum Temperature, deg F (1885-2018):

1) 66.3 in 2018
2) 65.0 in 2016
3) 64.9 in 2001
4) 64.6 in 2012
5) 64.4 in 2005
64.4 in 2015

PRELIMINARY STATS FOR AUGUST 2018

TEMPERATURE, Deg. F
Avg. Max. 82.4 [+3.2]
Avg. Min. 66.3 [+4.5]
Mean      74.4 [+3.9]
24-hour corrected mean: 73.4
Max. for month: 94F on 29th
Min. for month: 58F on 31st

COOLING DEGREE DAYS
Total heating units: 297 [+111]
Total for the season: 752 [+215]
Total for last season: 607

PRECIPITATION, Inches
Total: 3.94 [-0.09]
Greatest in 24 hrs: 1.16 on the 4th

WIND, mph
Avg. uncorrected wind speed: 9.6
Avg. corrected wind speed: 10.2
Prevailing wind direction: SW at 13%
Peak gust and direction: 35 NW on 3rd
35 WNW on 22nd

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

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrostratus
Temperature: 65F; Dew Point: 57F; Wind: NE @04 kts,
Wind: Light
Sea-level pressure: 30.37 ins. Hg, rising, then more rapidly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 65F
6-hr Min temp: 58F
24-hr Precip: 0.00 ins.
BHO SA 1155 90 SCT 250 SCT 40 283/65/57/0404/037/ DSNT HZ
ALQDS WND LGT/ 8/038 53007 10065 20058

10 A.M.
Weather: Scattered cumulus, broken altocumulus,
broken cirrostratus
Temperature: 70F; Dew Point: 60F; Wind: NE at 04 kts
Wind: Light
Sea-level pressure: 30.37 ins. Hg, rising then falling
Visibility: 40 miles, distant haze in all directions
3-hr Precip: 0.00 ins.
BHO SA 1455 80 SCT E140 BKN 250 BKN 40 284/70/60/0504/037/
DSNT HZ ALQDS WND LGT/ 8/138 50001

1 P.M.
Weather: Scattered stratocumulus, scattered cirrus
Temperature: 74F; Dew Point: 58F; Wind: NE at 06G13 kts
Wind: Light
Sea-level pressure: 30.34 ins. Hg, falling then rising
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 75F
6-hr Min temp: 65F
6-hr Precip: 0.00 ins.
BHO SA 1755 35 SCT 250 SCT 40 277/74/58/0506G13/034/ DSNT HZ
ALQDS WND LGT/ 8/401 55007 10075 20065

SUMMARY FOR FRIDAY, AUGUST 31, 2018

TEMPERATURE (DEGREES F)
MAX…..72   NORMAL…..77
MIN…..58   NORMAL…..60
MEAN….65   NORMAL…..68

DEPARTURE FROM 30-YEAR NORMAL…………………….-3
TOTAL DEPARTURE FOR THE MONTH…………………..+124 [+3.8
DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE……….-3
TOTAL COOLING UNITS FOR THE MONTH………….297  DEPARTURE……..+111
TOTAL COOLING UNITS FOR THE SEASON…………752  DEPARTURE……..+215
TOTAL COOLING UNITS LAST SEASON TO DATE…….607  DEPARTURE……..+145

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………24 ENE AT 12:39 A.M.
AERO……………………..23 ENE AT 12:51 A.M.
ASOS……………………..25 ENE AT 11:30 A.M.
DAVIS…………………….25 ENE AT 11:30 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………..16 ENE AT 12:30 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..17 ENE AT 12:04 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….18 ENE AT 11:51 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….9.8 ENE
ASOS……………………10.2
DAVIS…………………..10.2 ENE [60 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……….3.94  DEPARTURE……-0.09
ASOS…………..3.94
TOTAL PRECIPITATION FOR THE YEAR……….37.95  DEPARTURE……+3.11
ASOS………….39.52

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

8/1  82/66/74/+2/T/199/23           31 S   AERO 30 S   RMY 31
8/2  92/74/83/+11/0.00/761/88       30 SW  AERO 28 SW  RMY 31
8/3  88/74/81/+9/0.19/492/57        35 NW  AERO 32 NW  RMY 35 TSTM
8/4  82/69/76/+4/1.16/301/35        28 SW  AERO 25 SW  RMY 30 TSTM
8/5  89/66/78/+6/0.00/815/95        20 W   AERO 18 W   RMY 19
8/6  92/71/82/+10/0.00/822/96       20 W   AERO 16 WSW RMY N/A
8/7  92/73/83/+11/0.00/682/80       25 S   AERO 23 S   RMY 26
8/8  88/71/80/+8/0.70/460/54        25 SSW AERO 25 SSW RMY N/A TSTM
8/9  86/70/78/+6/0.07/509/60        29 SW  AERO 28 SW  RMY N/A TSTM
8/10 85/66/76/+5/0.00/651/77        17 NW  AERO 16 NW  RMY N/A
8/11 70/66/68/-3/0.34/000/00        18 SE  AERO 17 SE  RMY 18
8/12 73/66/70/-1/0.39/000/00        23 NNE AERO 18 NNE RMY 21
8/13 69/64/67/-4/0.17/000/00        23 ENE AERO 21 ENE RMY 21
8/14 83/69/76/+5/0.00/502/60        25 S   AERO 23 S   RMY 24
8/15 86/68/77/+6/0.00/509/61        20 W   AERO 17 W   RMY 19
8/16 87/70/79/+8/0.00/515/62        20 W   AERO 18 W   RMY 20
8/17 83/67/75/+4/0.00/531/64        23 SSW AERO 23 SSW RMY N/A
8/18 83/63/73/+2/0.50/165/20        31 NE  AERO 30 NE  RMY 33 TSTM
8/19 68/62/65/-5/0.03/527/64        30 NE  AERO 30 NE  RMY 32
8/20 72/61/67/-3/0.00/591/72        28 ENE AERO 25 ENE RMY 27
8/21 69/61/65/-5/T/155/19           20 ESE AERO 17 ESE RMY N/A
8/22 82/62/72/+2/0.38/326/40        35 WNW AERO 35 WNW RMY 35
8/23 76/60/68/-2/0.01/187/23        25 NW  AERO 23 NW  RMY 27
8/24 82/59/71/+1/0.00/754/93        20 SSE AERO 18 SSE RMY 20
8/25 80/59/70/+1/0.00/735/91        20 S   AERO 18 S   RMY 20
8/26 81/59/70/+1/0.00/716/89        21 SSW AERO 20 SSW RMY 21
8/27 86/67/77/+8/0.00/706/88        21 WNW AERO 18 WNW RMY 18
8/28 93/72/83/+14/0.00/672/84       25 WSW AERO 25 WSW RMY 28
8/29 94/75/85/+16/0.00/…/..       25 SW  AERO 24 SW  RMY 27
8/30 88/67/78/+10/0.00/…/..       23 ENE AERO 21 ENE RMY N/A
8/31 72/58/65/-3/0.00/…/..        24 ENE AERO 23 ENE RMY N/A

DAILY RECORDS FOR AUGUST 2018

08/03/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F,
BREAKS PREVIOUS RECORD OF 71F SET IN 1928, 1969, AND 1979

08/07/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1988

08/29/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 75F,
BREAKS PREVIOUS RECORD OF 74F SET IN 1948

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

9/1 Low temp since midnight is 58F; normal low is now 59F

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

RECORDS FOR SEPTEMBER 1
HIGH 93F IN 1969, 2010
LOW 47F IN 1975, 2017
PRECIP 2.32 INCHES IN 2013
PEAK GUST 59e MPH S IN 1945, SSW IN 1965

RECORDS FOR SEPTEMBER 2
HIGH 99F IN 1953 (SEPTEMBER MAXIMUM RECORD)
LOW 44F IN 1909
PRECIP 2.73 INCHES IN 1947
PEAK GUST 55e MPH WNW IN 1944

TODAY’S REPORT PREPARED BY: Samantha Richard/Kaitlin Geagan

 

Category: Daily Discussions

Leave a Reply