Thursday, September 7, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 7, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERNIGHT STORM LEAVES MORE THAN 1 INCH OF RAIN

An overnight storm left 1.23 inches of precipitation. This
amount is more than 1 inch above the normal daily total of
0.13 inches. The morning was foggy with low visibility at 5
miles but cleared to 75 miles by the 1:00 PM EST observation.
As the fog cleared, conditions started to dry out and humidity
dropped from 97% at 7:00 AM EST to 55% at 1:00 PM EST, and it
continues to drop. Winds shifted from the northwest to the
southwest just before 6:00 AM EST. We hit a seasonable
76F around 9:00 AM EST yesterday before a cold front moved in,
and we observed an almost 10 degree drop in temperature between
12:00 AM EST and 1:00 PM.

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: Fog, overcast stratus
Temperature: 59F; Dew Point: 58F; Wind: W at 10 kts
Sea-level pressure: 29.82 ins. Hg, falling then rising
Visibility: 5 miles
6-hr Max temp: 59F
6-hr Min temp: 58F
24-hr Precip:  1.28 inches
BHO SA 1155 E9 OVC 5F 097/59/58/2610/982/ 8/6// 53012 MANUAL
70128 ASOS 70128 10059 20058

10 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 65F; Dew Point: 59F; Wind: WSW at 09G16 kts
Sea-level pressure: 29.84 ins. Hg, steady then rising
Visibility: 45 miles, distant fog in all directions
BHO SA 1455 11 SCT E120 BKN 45 105/65/59/2409G16/984/ DSNT FG
ALQDS/ 8/087 51008

1 P.M.
Weather: Broken stratocumulus
Temperature: 71F; Dew Point: 54F; Wind: WSW at 11G19 kts,
Sea-level pressure: 29.84 ins. Hg, rising then falling
Visibility: 75 miles
6-hr Max temp: 73F
6-hr Min temp: 59F
6-hour Precip: 0.00 inches
BHO SA 1755 E42 BKN 75 104/71/54/2411G19/984/ 8/400 58001
10073 20059

 

SUMMARY FOR WEDNESDAY, SEPTEMBER 6, 2017

TEMPERATURE (DEGREES F)
MAX…..76   NORMAL…..75
MIN…..59   NORMAL…..58
MEAN….68   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH……………………-21 [-3.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………3   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..13   DEPARTURE……….-8
TOTAL COOLING UNITS FOR THE SEASON…………620   DEPARTURE………+62
TOTAL COOLING UNITS LAST SEASON TO DATE…….798   DEPARTURE……..-178

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH…………..20   DEPARTURE………+12
TOTAL HEATING UNITS FOR THE SEASON………….46   DEPARTURE………+13
TOTAL HEATING UNITS LAST SEASON TO DATE……..11   DEPARTURE………+35

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28  S  AT 10:02 A.M.
AERO……………………28 SSW AT  9:04 A.M.
ASOS……………………30  S  AT  9:04 A.M.
DAVIS…………………..29  S  AT  9:04 A.M. RMY 30
FASTEST MILE FOR YESTERDAY…………………21  S  AT 10:06 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23  S  AT 10:12 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20  S  AT  9:04 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.9  S
ASOS………………….10.2
DAVIS………………….8.2  S [192 DEG.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.28  DEPARTURE……+1.15
ASOS…………..1.28
TOTAL PRECIPITATION FOR THE MONTH……….1.52  DEPARTURE……+0.81
ASOS…………..1.55
TOTAL PRECIPITATION FOR THE YEAR……….37.88  DEPARTURE……+2.15
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  84/62/73/+6/0.00/…/..               36 S   AERO 32 S   RMY 38
9/6  76/59/68/+1/…./…/..               28 S   AERO 28 S   RMY 30

9/7  Low temp since midnight is 58F; 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 7
HIGH 92F IN 2007, 2015
LOW 40F IN 1888
PRECIP 2.95 INCHES IN 1891
PEAK GUST 58e MPH W IN 1941

RECORDS FOR SEPTEMBER 8
HIGH 97F IN 2015
LOW 42F IN 1978
PRECIP 1.51 INCHES IN 2011
PEAK GUST 45 MPH S IN 2012

TODAY’S REPORT PREPARED BY: Kaitlin Ann Geagan