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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 5, 2015 
ALL TIMES ARE IN EASTERN STANDARD TIME

PATTERN CONTINUES WITH EASTERLY WINDS AND COOLER
THAN NORMAL TEMPS

Yesterday, temperatures struggled and failed to climb out
of the 50s, with a maximum reading of 55F coming around
10:30 AM EST. Overnight temperatures dipped to a slightly
cooler than normal 46F. Temperatures are still running more
than 5 degrees below normal so far this month after the
warmest September on record.

Skies have been mostly cloudy today with peeks of sun 
this morning. By the 1:00 PM EST observation clouds had thickened
to overcast stratus. A trace of drizzle had fallen during a 
brief shower from 12:35 to 12:48 PM. A maximum of just 59F
had been reached by that time.
 

BHO Warmest Septembers (NWS mean), deg F (1885-2015):

1) 68.2 in 2015
2) 66.9 in 1961
3) 66.5 in 1930
4) 66.4 in 1999
5) 66.2 in 2002
   66.2 in 2005

BHO Warmest September Average Maximum Temperature, deg F (1885-2015):

1) 77.8 in 2015
2) 76.6 in 1930
3) 75.7 in 2007
4) 75.6 in 1959
5) 75.5 in 1961

BHO Warmest September Average Minimum Temperature, deg F (1885-2015):

1) 58.8 in 1988
2) 58.5 in 2015
3) 58.2 in 1961
   58.2 in 1999
5) 57.8 in 2005

BHO Warmest Aug-Sep (24-hour adjusted mean), deg F (1885-2015):

1) 69.8 in 2015
2) 68.9 in 2005
3) 68.6 in 2002
4) 68.2 in 2010
5) 67.8 in 1959 

BHO Slowest September Mean Wind Speed, mph (1885-2015):

1) 10.3 in 2015
2) 10.5 in 2014
3) 10.6 in 2013
4) 10.7 in 2011
5) 10.9 in 1917
   10.9 in 2003

BHO Sunniest Septembers, hours (1885-2015):

1) 267.7 in 1983  [74%]
2) 266.9 in 1941  [74%]
3) 265.9 in 2007  [74%]
4) 255.3 in 1948  [71%]
5) 251.9 in 2015  [70%]
6) 251.0 in 1967  [70%]
7) 246.8 in 1952  [69%]
   246.8 in 1978  [69%]

BHO Sunniest Aug-Sep, hours (1885-2015):

1) 555.1 in 2015  [72%]
2) 553.0 in 1941  [72%]
3) 536.0 in 2007  [69%]
4) 527.3 in 2014  [68%]
5) 520.2 in 1932  [67%]
6) 515.3 in 1921  [67%]
7) 514.3 in 1968  [67%]


PRELIMINARY STATS FOR SEPTEMBER 2015

TEMPERATURE, Deg. F
Avg. Max. 77.8 [+6.2]
Avg. Min. 58.5 [+3.9]
Mean      68.2 [+5.1]
Corrected mean: 67.3
Max. for month: 97 on 8th
Min. for month: 46 on 27th

COOLING DEGREE DAYS
Total cooling units: 144 [+84]  
Total for the season: 810 [+213]
Total for last season: 587

HEATING DEGREE DAYS
Total heating units: 42 [-75]  
Total for the season: 43 [-99]
Total for last season: 101

PRECIPITATION, Inches
Total: 3.88 [-0.18]
Greatest in 24 hrs: 2.53 inches from 9/29-30
 
WIND, mph
Avg. uncorrected wind speed: 10.1
Avg. corrected wind speed: 10.3
Prevailing wind direction: SSW @ 13%
Peak gust and direction: 47 S on the 30th

SUNSHINE:
Campbell-Stokes card minutes: 15114 mins. of possible 21582 or 70%
Astronomical total minutes:   15766 mins. of possible 22472 or 70%

Today's Observations:

7 A.M.
Weather: Scattered altocumulus, thin broken cirrus,
thin fog ENE-SSW
Temperature: 48F; Dew Point: 43F; Wind: NNE at 10 kts,
Sea-level pressure: 30.25 ins. Hg, falling, then rising and higher
Visibility: 80 miles, except 40 miles ENE-E, 30 miles ESE-SSW   
6-hr Max temp: 50F  
6-hr Min temp: 46F
24-hr precip: 0.00 inches
BHO SA 1155 42 SCT E200 -BKN 80 243/48/43/0310/025/ VSBY ESE-SSW 20 MI 
ENE-E 40 MI THN FG ENE-SSW/ 8/032 55001 10050 20046

10 A.M.
Weather: Broken stratocumulus 
Temperature: 56F; Dew Point 48F; Wind: NE at 8 kts,
Sea-level pressure: 30.24 ins. Hg, rising, then falling and lower
Visibility: 30 miles, except 70 miles WSW-NNE, thin fog NE-SW
BHO SA 1455 E39 BKN 30 239/56/48/0408/024/ VSBY WSW-NNE 70 MI THN FG 
NE-SW/ 8/500 58004   
 
1 P.M.
Weather: Light drizzle begins at 12:35 PM EST, ends 12:48 PM EST,
showers distant SE and SW, overcast stratocumulus
Temperature: 56F; Dew Point: 51F; Wind: NE at 7 kts
Sea-level pressure: 30.19 ins. Hg, decreasing then more rapidly 
Visibility: 30 miles, except 15 miles SW, 70 miles W-NNE  
6-hr Max: 59F
6-hr Min: 48F
6-hr precip: Trace
BHO SA 1755 E41 OVC 30 224/56/51/0507/019/ L-B35E48 VSBY SW 15 MI 
W-NNE 70 MI SHWRS DSNT SW AND SE/ 58015 MANUAL 6000/ 10059 10048 


SUMMARY FOR SUNDAY, OCTOBER 4, 2015 
  
TEMPERATURE (DEGREES F)
MAX.....55   NORMAL.....65 
MIN.....49   NORMAL.....47 
MEAN....52   NORMAL.....56 
 
DEPARTURE FROM 30-YEAR NORMAL........................-4
TOTAL DEPARTURE FOR THE MONTH.......................-24  [-5.8 DEGREES/DAY]
 
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY...............0   DEPARTURE...........0
TOTAL COOLING UNITS FOR THE MONTH...............0   DEPARTURE..........-1
TOTAL COOLING UNITS FOR THE SEASON............810   DEPARTURE........+212
TOTAL COOLING UNITS LAST SEASON TO DATE.......587   DIFFERENCE.......+223

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............13   DEPARTURE..........+4
TOTAL HEATING UNITS FOR THE MONTH..............58   DEPARTURE.........+22
TOTAL HEATING UNITS FOR THE SEASON............101   DEPARTURE.........-77
TOTAL HEATING UNITS LAST SEASON TO DATE.......146   DIFFERENCE........-45
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................35  E   AT 12:55 A.M. 
                   ASOS........................40  E   AT 12:55 A.M.  
                   DAVIS.......................34  E   AT  8:52 A.M. RMY 40
FASTEST MILE FOR YESTERDAY.................... 26  ENE AT  8:53 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE..................24  ENE AT  8:53 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE.................22  E   AT  N/A 
AVERAGE WIND SPEED AND DIRECTION.............16.0 ENE
                   ASOS......................15.3   
                   DAVIS.....................14.2 ENE [068 DEG] 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00  DEPARTURE.....-0.15
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........0.52  DEPARTURE.....-0.08
                         ASOS...............0.50
TOTAL PRECIPITATION FOR THE YEAR...........34.19  DEPARTURE.....-5.02
                         ASOS................N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER & OCTOBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

9/1  81/65/73/+5/0.00/766/97               20 SSW RMY 20
9/2  89/64/77/+9/0.00/732/93               20 SW  RMY 21  
9/3  85/66/76/+9/T/612/78                  17 E   RMY N/A TSTM 
9/4  72/58/65/-2/0.00/297/38               31 ENE RMY N/A
9/5  77/55/66/-1/0.00/748/96               14 SW  RMY 18
9/6  87/57/72/+5/0.00/753/97               21 SSW RMY 22
9/7  92/63/78/+12/0.00/727/94              23 WSW RMY 24
9/8  97/70/84/+18/0.00/693/90              22 WSW RMY 24
9/9  92/70/81/+15/0.00/683/89              30 SSW RMY 33
9/10 73/62/68/+3/0.32/000/00               29 NE  RMY N/A
9/11 70/59/65/0/0.59/084/11                33 NE  RMY N/A
9/12 75/58/67/2/..../380/50                18 SSE RMY 25 
9/13 66/60/63/-1/..../000/00               25 E   RMY N/A
9/14 70/53/62/-2/0.00/550/73               33 W   RMY 35
9/15 82/56/69/+5/0.00/736/98               23 W   RMY N/A
9/16 84/62/73/+10/0.00/711/95              17 NW  RMY N/A
9/17 87/64/76/+13/0.00/723/97              17 SW  RMY 16
9/18 86/64/75/+13/0.00/712/96              21 SSW RMY 21
9/19 80/62/71/+9/0.00/480/65               22 S   RMY N/A
9/20 74/55/65/+3/T/552/75                  24 S   RMY N/A  
9/21 65/50/58/-3/0.00/646/88               29 ENE RMY 30
9/22 67/55/61/+0/0.00/183/25               21 E   RMY 21
9/23 72/50/61/+1/0.00/677/93               15 E   RMY N/A
9/24 72/56/64/+4/0.00/696/96               22 E   RMY 21   
9/25 66/53/60/0/0.00/556/77                21 E   RMY 20 
9/26 63/49/56/-3/0.00/633/88               25 ENE RMY 25
9/27 71/46/59/+0/0.00/688/96               17 S   RMY 18
9/28 81/57/69/+11/0.00/428/60              22 SSW RMY 24
9/29 82/65/74/+16/..../320/45              28 S   RMY N/A
9/30 75/53/64/+6/..../000/00               47 S   RMY 51  TSTM

10/1 55/51/53/-4/..../.../..               39 NE  RMY N/A
10/2 51/47/49/-8/..../.../..               40 NE  RMY 43 
10/3 51/45/48/-8/..../000/00               38 NE  RMY N/A 
10/4 55/49/52/-4/0.00/.../..               35 E   RMY 40

10/5 low since midnight is 46F; normal low is now 47F  

DAILY RECORDS FOR SEPTEMBER & OCTOBER 2015

**9/7 DAILY RECORD MAXIMUM TEMPERATURE OF 92F 
TIES PREVIOUS RECORD SET IN 2007**

**9/8 DAILY RECORD MAXIMUM TEMPERATURE OF 97F
BREAKS PREVIOUS RECORD OF 93F SET IN 2007**

**9/8 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**

**9/9 DAILY RECORD MAXIMUM TEMPERATURE OF 92F
BREAKS PREVIOUS RECORD OF 91F SET IN 2002**

**9/9 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F
BREAKS PREVIOUS RECORD OF 69F SET IN 1999**

**9/17 DAILY RECORD MAXIMUM TEMPERATURE OF 87F
BREAKS PREVIOUS RECORD OF 86F SET IN 1915, 1941, AND 1991**

**9/18 DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F
TIES PREVIOUS RECORD SET IN 1992**

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

RECORDS FOR OCTOBER 5
HIGH 86F IN 2007
LOW 29F IN 1965
PRECIP 3.17 INCHES IN 1962
PEAK GUST 64e MPH S IN 1979

RECORDS FOR OCTOBER 6
HIGH 83F IN 1990, 2007
LOW 26F IN 1965
PRECIP 3.78 INCHES IN 1962
PEAK GUST 60e MPH S IN 1942

TODAY'S REPORT PREPARED BY: Brian Fitzgerald