Sunday, October 1, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, OCTOBER 1, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEAR SKIES AND GREAT VISIBILITY AFTER CHILLY MORNING

High pressure over the region has brought clear skies which helped
temps. drop to a chilly low of 42F this morning.  Temps. had rebounded
to 63F by 1:00PM but should rise a degree or two more since skies have
remained clear through the early afternoon.  The dry weather allowed
visibility to reach over 70 miles today with dew points in the mid-30s
at 1:00PM.

 

PRELIMINARY STATS FOR SEPTEMBER 2017

TEMPERATURE, Deg. F
Avg. Max. 74.5 [+2.9] Avg. Min. 57.3 [+2.7] Mean      65.9 [+2.8] 24-hour corrected mean: 65.1
Max. for month: 86F on 25th and 27th
Min. for month: 44F on 30th

HEATING DEGREE DAYS
Total heating units: 67 [-50] Total for the season: 93 [-49] Total for last season: 75

COOLING DEGREE DAYS
Total cooling units: 100 [+40] Total for the season: 707 [+110] Total for last season: 894

PRECIPITATION, Inches
Total: 5.50 [+1.44] Greatest in 24 hrs: 2.33 on the 30th

WIND, mph
Avg. uncorrected wind speed: 10.2
Avg. corrected wind speed: 10.8
Prevailing wind direction: NNE at 13%
Peak gust and direction: 47 NNE on 21st

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

Today’s Observations:

7 A.M.
Weather: Few distant cumulus ENE-SE, patches of radiation fog below
summit SSW-NNW
Temperature: 43F; Dew Point: 41F; Wind: NNW at 10 kts
Sea-level pressure: 30.37 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 44F
6-hr Min temp: 42F
24-hr precip: 2.32 in.
BHO SA 1155 CLR 70 283/43/41/3310/037/ FEW CU DSNT ENE-SE PTCHS GF
BLO SMT SSW-NNW/ 8/100 53007 MANUAL 70232 ASOS 70243 10044 20042

10 A.M.
Weather: Few distant cumulus E-SSE
Temperature: 55F; Dew Point: 40F; Wind: NNW at 5 kts,
Wind speed: Light
Sea-level pressure: 30.37 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 CLR 70 286/55/40/3305/037/ FEW CU DSNT E-SSE WND LGT/
8/100 50003

1 P.M.
Weather: Few distant cumulus E-SSE
Temperature: 61F; Dew Point: 35F; Wind: W at 6 kts,
Wind speed: Light
Sea-level pressure: 30.31 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max temp: 63F
6-hr Min temp: 43F
BHO SA 1755 CLR 70 265/61/35/2806/031/ FEW CU DSNT E-SSE WND LGT/
8/100 58021 10063 20043

 

SUMMARY FOR SATURDAY, SEPTEMBER 30, 2017

TEMPERATURE (DEGREES F)
MAX…..56   NORMAL…..66
MIN…..44   NORMAL…..49
MEAN….50   NORMAL…..58

DEPARTURE FROM 30-YEAR NORMAL…………………….-8
TOTAL DEPARTURE FOR THE MONTH……………………+88 [+2.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….100   DEPARTURE………+40
TOTAL COOLING UNITS FOR THE SEASON…………707   DEPARTURE……..+110
TOTAL COOLING UNITS LAST SEASON TO DATE…….894   DEPARTURE……..-187

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..15   DEPARTURE……….+7
TOTAL HEATING UNITS FOR THE MONTH…………..67   DEPARTURE………-50
TOTAL HEATING UNITS FOR THE SEASON………….93   DEPARTURE………-49
TOTAL HEATING UNITS LAST SEASON TO DATE……..75   DEPARTURE………+18

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28 NE  AT   9:03 A.M.
AERO……………………25 ENE AT  10:06 A.M.
ASOS……………………29 NE  AT   9:22 A.M.
DAVIS…………………..26 NE  AT   9:21 A.M. RMY 27
FASTEST MILE FOR YESTERDAY…………………22 NE  AT   9:03 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………24 NE  AT   9:04 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 NNE AT   9:04 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.7 NE
ASOS…………………..8.9
DAVIS………………….7.3 NE [047 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….2.32  DEPARTURE……+2.17
ASOS…………..2.43
TOTAL PRECIPITATION FOR THE MONTH……….5.50  DEPARTURE……+1.44
ASOS…………..5.68
TOTAL PRECIPITATION FOR THE YEAR……….41.86  DEPARTURE……+2.78
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

 

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/1  68/47/58/-10/0.00/749/95              26 WNW AERO 28 WNW RMY 31
9/2  72/46/59/-9/0.00/542/69               18 NNW AERO 18 NNW RMY 21
9/3  63/52/58/-9/0.24/000/00               33 W   AERO 33 W   RMY 37
9/4  79/55/67/0/0.00/702/90                29 SSW AERO 28 SSW RMY N/A
9/5  84/62/73/+6/0.00/583/75               36 S   AERO 32 S   RMY 38
9/6  76/59/68/+1/0.49/070/09               28 S   AERO 28 S   RMY 30 TSTM
9/7  74/58/66/0/0.79/417/54                24*WSW AERO 23 WSW RMY 24
9/8  74/53/64/-2/0.00/577/75               21 WSW AERO 18 WSW RMY 22
9/9  68/51/60/-6/T/620/81                  18 ENE AERO 16 ENE RMY 18
9/10 71/51/61/-4/0.00/694/91               18 NW  AERO 16 NW  RMY N/A
9/11 78/50/64/-1/0.00/692/91               20 NNW AERO 17 NNW RMY 20
9/12 84/58/71/+6/0.00/690/91               22 WSW AERO 18 WSW RMY 23
9/13 84/59/72/+8/T/680/90                  18 WSW AERO 15 WSW RMY 20 TSTM
9/14 82/66/74/+10/0.00/233/31              23 SW  AERO 23 WSW RMY 25 TSTM
9/15 83/66/75/+11/0.05/300/40              18 WNW AERO 15 WNW RMY 18
9/16 78/65/72/+9/T/261/35                  14 E   AERO  9 E   RMY 12
9/17 79/61/70/+7/T/334/45                  15 SSE AERO 14 SSE RMY 15
9/18 67/62/65/+3/0.02/000/00               21 NE  AERO 18 NE  RMY N/A
9/19 63/61/62/0/0.13/000/00                28 NE* AERO 25 NNE RMY N/A
9/20 68/62/65/+3/0.67/000/00               41 NNE AERO 44 NNE RMY 45
9/21 69/60/65/+4/0.01/242/33               47 NNE AERO 44 NNE RMY 50
9/22 60/54/57/-4/0.56/000/00               40 NNE AERO 38 NNE RMY N/A
9/23 74/59/67/+7/0.21/421/58               29 NNE AERO 29 NNE RMY N/A
9/24 85/63/74/+14/0.00/688/95              16 N   AERO 14 N*  RMY N/A
9/25 86/66/76/+16/0.00/671/93              15 ESE*AERO 13 ESE RMY 14
9/26 84/66/75/+16/0.00/503/70              15 SW  AERO 12 SW* RMY 14
9/27 86/64/75/+16/0.00/551/77              21 S   AERO 20 S   RMY 22
9/28 75/52/64/+6/0.00/605/85               29 NNW AERO 30 NNW RMY 33
9/29 65/46/56/-2/0.00/…/..               21 NNW AERO 20 NNW RMY N/A
9/30 56/44/50/-8/2.33/000/00               28 NE  AERO 25 ENE RMY 27 TSTM

 

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/1 Low temp since midnight is 42F; normal low is now 49F

DAILY RECORDS FOR SEPTEMBER

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

9/27/17: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 86F,
BREAKS PREVIOUS RECORD SET IN 1998 AND TIED IN 2014

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

RECORDS FOR OCTOBER 1
HIGH 85F IN 1927
LOW 30F IN 1992
PRECIP 1.63 INCHES IN 2014
PEAK GUST 68e MPH SSE IN 1977

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle