Tuesday, September 5, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 5, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

HUMID CONDITIONS RETURN

Warm and humid conditions have returned to the Boston
region.  Temperatures reached a minimum of only 62F
over night.  The max. by 1:00PM was 84F, which makes
today the warmest day at BHO in almost two weeks.  Dew
points were also at their highest levels in the past
couple weeks measuring in the mid to upper 60s.

Haze has accompanied the humidity today and has limited
visibility to 15-25 miles at each observation.  Winds
continue to be out of the south-southwest and south and
have remained quite gusty.  The morning hours saw a peak
wind of 30 MPH SSW at 3:06AM, and winds have continued
to gust up to 25 MPH through the early afternoon.

 

PRELIMINARY STATS FOR AUGUST 2017

TEMPERATURE, Deg. F
Avg. Max. 80.1 [+0.9] Avg. Min. 61.4 [-0.4] Mean      70.8 [+0.3] 24-hour corrected mean: 69.7
Max. for month: 89F on 19th
Min. for month: 55F on 26th, 27th, and 31st

COOLING DEGREE DAYS
Total cooling units: 186 [0] Total for the season: 607 [+70] Total for last season: 792

HEATING DEGREE DAYS
Total heating units: 2 [-14] Total for the season: 26 [+2] Total for last season: 10

PRECIPITATION, Inches
Total: 1.60 [-2.43] Greatest in 24 hrs: 1.09 on the 2nd

WIND, mph
Avg. uncorrected wind speed: 9.3
Avg. corrected wind speed: 10.0
Prevailing wind direction: S at 18%
Peak gust and direction: 33 S on 18th

SUNSHINE:
Campbell-Stokes card minutes: 16,080 minutes of possible 24,780 or 65%
Astronomical total minutes: 16,694 minutes of possible 25,731 or 65%

 

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 67F; Dew Point: 64F; Wind: SSW at 17G24 kts,
Peak Wind: 26 kts (30 MPH) SSW at 6:15AM EST
Sea-level pressure: 29.82 ins. Hg, rising unsteadily
Visibility: 15 miles, except 25 miles E-SE, hazy
6-hr Max temp: 67F
6-hr Min temp: 62F
24-hr Precip: 0.00 inches
BHO SA 1155 E10 OVC 15 097/67/64/2017G24/982/ VSBY E-SE 25 HAZY
PK WND 2126/15/ 8/6// 52002 10067 20062

10 A.M.
Weather: Few cumulus in all directions, haze aloft in all directions
Temperature: 78F; Dew Point: 66F; Wind: S at 16G20 kts
Sea-level pressure: 29.81 ins. Hg, falling unsteadily
Visibility: 20 miles
BHO SA 1455 CLR 20 095/78/66/1916G20/981/ FEW CU ALQDS HZ ALF ALQDS/
8/100 58002

1 P.M.
Weather: Scattered cumulus
Temperature: 83F; Dew Point: 67F; Wind: S at 15G22 kts
Sea-level pressure: 29.78 ins. Hg, falling, then more quickly
Visibility: 15 miles, hazy
6-hr Max temp: 84F
6-hr Min temp: 67F
BHO SA 1755 39 SCT 15 086/83/67/1815G22/978/ HAZY/ 8/100 58009
10084 20067

 

SUMMARY FOR MONDAY, SEPTEMBER 4, 2017

TEMPERATURE (DEGREES F)
MAX…..79   NORMAL…..76
MIN…..55   NORMAL…..59
MEAN….67   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL……………………..0
TOTAL DEPARTURE FOR THE MONTH……………………-28 [-7.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE MONTH……………2   DEPARTURE………-13
TOTAL COOLING UNITS FOR THE SEASON…………609   DEPARTURE………+57
TOTAL COOLING UNITS LAST SEASON TO DATE…….797   DEPARTURE……..-188

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH…………..20   DEPARTURE………+15
TOTAL HEATING UNITS FOR THE SEASON………….46   DEPARTURE………+16
TOTAL HEATING UNITS LAST SEASON TO DATE……..11   DEPARTURE………+35

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….29 SSW AT  4:49 P.M.
AERO……………………28 SSW AT  4:49 P.M.
ASOS……………………30 SSW AT  4:49 P.M.
DAVIS…………………..31 SSW AT  4:49 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………23 SSW AT 11:32 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 SSW AT 11:33 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..23 SSW AT  4:44 P.M.
AVERAGE WIND SPEED AND DIRECTION………….15.3 WSW
ASOS………………….15.0
DAVIS…………………13.9 SW [233 DEG.] *last of multiple occurrences
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……….0.24  DEPARTURE……-0.22
ASOS…………..0.27
TOTAL PRECIPITATION FOR THE YEAR……….36.60  DEPARTURE……+1.12
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

 

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  87/65/76/+4/0.00/762/88               16 ESE*AERO 16 NNW RMY 16
8/2  86/65/76/+4/1.09/372/43               32 W   AERO 36 W   RMY 34 TSTM
8/3  83/65/74/+2/0.00/552/64               22 S   AERO 23 S   RMY 24
8/4  84/66/75/+3/0.00/697/81               26 S   AERO 30 S   RMY 29
8/5  75/63/69/-3/0.10/060/07               23 NW  AERO 28 NW  RMY 29
8/6  76/57/67/-5/0.00/795/93               30 NW  AERO 32 NW  RMY 31
8/7  76/60/68/-4/0.01/597/70               28 SSW AERO 28 SSW RMY 29
8/8  74/60/67/-5/0.02/000/00               17 S   AERO 16 SSE RMY 16
8/9  83/58/71/-1/0.00/831/98               18 S   AERO 18 S   RMY 19
8/10 86/63/75/+4/T/643/76                  20 S   AERO 18 S   RMY 20
8/11 82/63/73/+2/0.00/666/79               17 S   AERO 16 S   RMY 17
8/12 75/57/66/-5/0.17/294/35               22 SSW*AERO 22 SSW RMY 23
8/13 84/67/76/+5/0.00/796/95               26 WNW AERO 24 WNW RMY 26
8/14 82/67/75/+4/0.00/359/43               14 SSW*AERO 14 S   RMY 15
8/15 79/64/72/+1/T/058/07                  21 S   AERO 21 S   RMY 23
8/16 83/64/74/+3/0.00/731/88               23 NW* AERO 23 NW  RMY 25
8/17 81/58/70/-1/0.00/745/90               15 SSW AERO 14 SSW RMY N/A
8/18 79/63/71/0/0.01/025/03                33 S   AERO 35 S   RMY 35
8/19 89/65/77/+7/0.00/502/61               23 WSW AERO 23 WSW RMY 25
8/20 84/66/75/+5/0.00/804/98               23 NW  AERO 25 NW  RMY 27
8/21 85/63/74/+5/0.00/687/84               18 SW  AERO 20 SW  RMY 20
8/22 88/68/78/+8/0.00/481/59               31 S   AERO 35 S   RMY 34
8/23 83/64/74/+4/0.04/642/79               24 WNW*AERO 25 WNW RMY 27
8/24 80/59/70/0/0.00/778/96                18 WNW*AERO 17 WNW RMY 21
8/25 75/57/66/-3/T/597/74                  21 NW  AERO 21 NW  RMY 23
8/26 75/55/65/-4/0.00/733/91               16 WNW AERO 16 SSE RMY 17
8/27 75/55/65/-4/0.00/770/96               17 ENE*AERO 16 ENE*RMY 18
8/28 74/56/65/-4/0.00/727/91               17 ENE AERO 16 ENE*RMY 18
8/29 68/57/63/-6/0.01/016/02               18 ENE AERO 16 ENE RMY N/A
8/30 72/57/65/-3/0.15/468/59               22 NNE AERO 21 NNE RMY 23
8/31 79/55/67/-1/0.00/506/64               23 NW  AERO 24 NW  RMY 27

DAILY RECORDS FOR AUGUST

None.

 

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  68/47/58/-10/0.00/…/..              26 WNW AERO 28 WNW RMY 31
9/2  72/46/59/-9/0.00/…/..               18 NNW AERO 18 NNW RMY 21
9/3  63/52/58/-9/0.24/…/..               33 W   AERO 33 W   RMY 37
9/4  79/55/67/0/0.00/…/..                29 SSW AERO 28 SSW RMY N/A

9/5  Low temp since midnight is 62F; normal low is now 58F

DAILY RECORDS FOR SEPTEMBER

9/1/17: DAILY RECORD LOW MINIMUM TEMPERATURE OF 47F,
TIES PREVIOUS RECORD SET IN 1975

 

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

RECORDS FOR SEPTEMBER 5
HIGH 90F IN 1971
LOW 45F IN 1906
PRECIP 1.37 INCHES IN 1907
PEAK GUST 46 MPH NW IN 1994

RECORDS FOR SEPTEMBER 6
HIGH 92F IN 1900
LOW 39F IN 1888
PRECIP 3.19 INCHES IN 1890
PEAK GUST 78e MPH SE IN 1979 (TROPICAL STORM DAVID)

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle