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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 27, 2015  
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD CLEAR CONDITIONS OVERNIGHT GIVE 
WAY TO SLOWLY BUILDING CLOUDS AND SUNSHINE

Temperatures dipped overnight under clear skies and
nearly calm winds. An inversion was in place this morning
with the summit of Great Blue Hill hitting a minimum
temperature of 36F while stations such as Norwood
Memorial Airport (KOWD) dipped below freezing to 21F.

High thin cirrus have generally overspread the sky 
throughout the day with mostly clear conditions otherwise.
By the 1:00 PM EST observation temperatures had reached
a maximum reading of 55F.

 
Today's Observations:

7 A.M.
Weather: Thin scattered cirrus, few stratocumulus distant
offshore NNE-ESE and S, few altocumulus distant WNW-N,
sun dogs visible
Temperature: 36F; Dew Point: 27F; Wind: NNW at 7 kts,
Sea-level pressure: 30.58 ins. Hg, rising, then more quickly
Visibility: 75 miles 
6-hr Max temp: 39F 
6-hr Min temp: 36F
24-hr precip: 0.00 in. 
BHO SA 1155 250 -SCT 75 356/36/27/3407/058/ FEW SC DSNT OFFSHR 
NNE-ESE AND S FEW AC DSNT WNW-N SUN DOGS/ 8/531 53008 10039 20036

10 A.M.
Weather: Thin broken cirrus, few stratocumulus distant
offshore NNE-E and S, few altocumulus distant NNW-NE
Temperature: 45F; Dew Point 29F; Wind: estimated N at 2 kts
Wind Speed: Light
Sea-level pressure: 30.62 ins. Hg, rising, then falling, but higher still  
Visibility: 70 miles, light distant haze    
BHO SA 1455 E250 -BKN 70 370/45/29/E3502/062/ FEW SC DSNT OFFSHR 
NNE-E AND S FEW AC DSNT NNW-NE LGT DSNT HZ ALQDS WND LGT/ 8/531 
50014

1 P.M. 
Weather: Thin broken cirrus, few stratocumulus distant N-SSW
Temperature: 54F; Dew Point 25F; Wind: estimated SW @ 4 kts
Wind Speed and Direction: Light and Variable 
Sea-level pressure: 30.58 ins. Hg, falling, then more quickly  
Visibility: 70 miles, light distant haze 
6-hr max temp: 55F
6-hr min temp: 35F 
BHO SA 1755 E250 -BKN 70 356/54/25/E2304/058/ FEW SC DSNT N-SSW 
LGT DSNT HZ ALQDS WND LGT AND VRB/ 8/501 58014 10055 20035


SUMMARY FOR MONDAY, OCTOBER 26, 2015 
  
TEMPERATURE (DEGREES F)
MAX.....53   NORMAL.....57
MIN.....38   NORMAL.....39 
MEAN....46   NORMAL.....48 
 
DEPARTURE FROM 30-YEAR NORMAL.......................-2
TOTAL DEPARTURE FOR THE MONTH......................-14  [-0.7 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..........-5
TOTAL COOLING UNITS FOR THE SEASON............810   DEPARTURE........+208
TOTAL COOLING UNITS LAST SEASON TO DATE.......595   DIFFERENCE.......+215

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............19   DEPARTURE..........+2
TOTAL HEATING UNITS FOR THE MONTH.............340   DEPARTURE..........+7
TOTAL HEATING UNITS FOR THE SEASON............383   DEPARTURE.........-92
TOTAL HEATING UNITS LAST SEASON TO DATE.......365   DIFFERENCE........+18
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY...................23  NNW AT 12:07 A.M.   
                   ASOS........................26  NNW AT 12:07 A.M.     
                   DAVIS.......................23  NW  AT  1:XX A.M. RMY N/A
FASTEST MILE FOR YESTERDAY.....................18  NNW AT 12:17 A.M.    
MAXIMUM 2-MINUTE ASOS AVERAGE..................18  NW  AT 12:19 A.M.       
MAXIMUM 2-MINUTE DAVIS AVERAGE.................15  NNW AT 12:XX A.M.      
AVERAGE WIND SPEED AND DIRECTION...............8.2 N 
                   ASOS........................8.0    
                   DAVIS...................... 7.3 NNW [342 Deg.] 

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00  DEPARTURE.....-0.16
                         ASOS...............0.00
TOTAL PRECIPITATION FOR THE MONTH...........1.11  DEPARTURE.....-2.80
                         ASOS...............1.09
TOTAL PRECIPITATION FOR THE YEAR...........35.25  DEPARTURE.....-7.74  
                         ASOS................N/A ***
*** ASOS annual total not available due to erroneous readings

PRELIMINARY CLIMATE SUMMARY FOR 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

10/1  55/51/53/-4/..../000/00               39 NE  RMY N/A
10/2  51/47/49/-8/..../000/00               40 NE  RMY 43 
10/3  51/45/48/-8/..../000/00               38 NE  RMY N/A 
10/4  55/49/52/-4/0.00/474/68               35 E   RMY 40
10/5  59/46/53/-3/T/125/18                  21 NE  RMY 20 
10/6  68/43/56/+1/0.00/663/96               17 NW  RMY 17
10/7  69/46/58/+3/0.00/640/93               20 W   RMY 20
10/8  63/49/56/+2/0.00/678/99               21 S   RMY N/A
10/9  68/50/59/+5/0.27/130/19               45 S   RMY 49
10/10 59/44/53/-2/0.00/673/99               33 NNW RMY N/A 
10/11 67/46/57/+4/0.00/582/86               26 SW  RMY 28
10/12 76/50/63/+10/0.00/647/96              22 SSW RMY 24
10/13 70/55/63/+10/0.27/208/31              23 S   RMY 24
10/14 66/46/56/+4/0.00/428/64               26 W   RMY 29
10/15 60/41/51/-1/0.00/659/99               20 SW  RMY 27
10/16 60/44/52/+1/T/471/71                  31 W   RMY 34
10/17 54/35/45/-6/T/482/73                  30 WNW RMY 33
10/18 45/28/37/-14/0.00/480/73              24 NNW RMY 25
10/19 47/26/37/-13/0.00/648/99              25 SSW RMY 30  
10/20 65/43/54/+4/0.00/.../..               28 SW  RMY 28
10/21 59/51/55/+5/0.01/.../..               18 SSE RMY 21  
10/22 71/51/61/+12/T/.../..                 31 W   RMY 34
10/23 55/34/45/-4/0.00/.../..               31 NNW RMY 34
10/24 46/33/40/-9/0.00/.../..               15 SSE RMY N/A   
10/25 59/44/52/+3/0.04/.../..               29 N   RMY 31
10/26 53/38/46/-2/0.00/.../..               23 NNW RMY 20

10/27 low since midnight is 35F; normal low is now 39F  

DAILY RECORDS FOR OCTOBER 2015

-NONE SO FAR.

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

RECORDS FOR OCTOBER 27
HIGH 83F IN 1963
LOW 21F IN 1936
PRE 1.79 INCHES IN 1886
SNOW 2.5 INCHES IN 2011
WIND 54 MPH WNW IN 1968

RECORDS FOR OCTOBER 28
HIGH 81F IN 1919
LOW 23F IN 1914
PRECIP 2.46 INCHES IN 2006
SNOWFALL TRACE IN 1934,1957,1979
PEAK GUST 71 MPH SSW IN 1995

TODAY'S REPORT PREPARED BY: Brian Fitzgerald