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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, JANUARY 21, 2016 
ALL TIMES ARE IN EASTERN STANDARD TIME

SEASONAL TEMPS REMAIN AS WINDS EASE OVERNIGHT

Cold air that was ushered into the region earlier this week
has largely remained in place with three consecutive days of
slightly colder than normal temperatures from Monday through
Wednesday this week. Yesterday temperatures reached a maximum
of 30F from 2:00 to 3:00 PM EST. Winds that were gusting to a
maximum of 46 MPH yesterday have relax this morning with a
steady but light flow from the WNW-NW.

By today's 1:00 PM EST observation, temperatures had risen from
this morning's minimum reading of 16F to a maximum so far of
30F. Skies were nearly cloudy free with excellent visibility of
80 miles in all directions.


Today's Observations:

7 A.M.
Weather: Scattered cirrus, few stratocumulus distant offshore NE-SE,
few altocumulus lenticularis in all directions
Temperature: 16F; Dew Point: 8F; Wind: WNW at 9 kts
Sea-level pressure: 30.03 ins. Hg, rising, then more quickly
Visibility: 80 miles
6-hr Max temp: 22F 
6-hr Min temp: 16F
24-hr precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 3 ins.
BHO SA 1155 250 SCT 80 169/16/8/3009/003/ FEW SC DSNT OFFSHR NE-SE 
FEW ACSL ALQDS/ 8/541 4/003 53010 10022 20016

10 A.M.
Weather: Clear, few stratocumulus distant offshore NE-SE,
few cumulus distant WNW, few cirrus distant N
Temperature: 25F; Dew Point: 12F; Wind: NW at 13G22 kts,
Sea-level pressure: 30.04 ins. Hg, rising, then more quickly
Visibility: 80 miles
BHO SA 1455 CLR 80 173/25/12/3113G22/004/ FEW SC DSNT OFFSHR NE-SE 
FEW CU DSNT WNW FEW CI DSNT N/ 8/501 53004

1 P.M.
Weather: Clear, few stratocumulus distant offshore NE-SE
Temperature: 29F; Dew Point: 12F; Wind: NW at 14G22 kts,
Peak Wind: 32 knots WNW at 12:00 PM EST
Sea-level pressure: 30.01 ins. Hg, falling, then more slowly
Visibility: 80 miles
6-hr Max temp: 30F
6-hr Min temp: 15F
BHO SA 1755 CLR 80 164/29/12/3114G22/001/ FEW SC DSNT OFFSHR NE-SE 
PK WND 3032/00/ 8/500 56009 10030 20015


SUMMARY FOR WEDNESDAY, JANUARY 20, 2016 
  
TEMPERATURE (DEGREES F)
MAX.....30   NORMAL.....33
MIN.....15   NORMAL.....17 
MEAN....23   NORMAL.....25

DEPARTURE FROM 30-YEAR NORMAL........................-2
TOTAL DEPARTURE FOR THE MONTH.......................+76 [+3.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............42   DEPARTURE..........+2
TOTAL HEATING UNITS FOR THE MONTH.............713   DEPARTURE.........-75
TOTAL HEATING UNITS FOR THE SEASON...........2369   DEPARTURE........-724
TOTAL HEATING UNITS LAST SEASON TO DATE......2878   DIFFERENCE.......-509

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY...................46  WNW  AT  12:50 P.M.*                   
                   ASOS........................43  WNW  AT  12:50 P.M. 
                   DAVIS.......................43  N    AT  12:42 P.M. RMY 45
FASTEST MILE FOR YESTERDAY.....................33  WNW  AT  12:43 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE..................30  WNW  AT  12:48 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE.................30  NW   AT  12:43 P.M.  
AVERAGE WIND SPEED AND DIRECTION..............18.4 NNW
                   ASOS.......................16.9
                   DAVIS......................15.7 NNW [328 Deg.]
*LAST IN A SERIES OF PEAK GUSTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE......-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........3.03  DEPARTURE......+0.19
                         ASOS..............3.15
TOTAL PRECIPITATION FOR THE YEAR...........3.03  DEPARTURE......+0.19  
                         ASOS..............3.15

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......-0.5
TOTAL SNOWFALL FOR THE MONTH................7.2  DEPARTURE.......-4.0
TOTAL SNOWFALL FOR THE SEASON...............7.5  DEPARTURE......-18.7

PRELIMINARY CLIMATE SUMMARY FOR JANUARY CALENDAR DAY DATA
DATA REPORTED:
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

1/1   37/29/33/+6/0.00/0.0/005/01           29 W               RMY 29
1/2   37/27/32/+5/0.00/0.0/461/84           31 W               RMY N/A         
1/3   41/27/34/+8/0.00/0.0/501/91           28 W               RMY 29
1/4   30/10/20/-6/T/T/000/00                29 NNW             RMY 29
1/5   23/4/14/-12/0.00/0.0/552/100          28 NNW             RMY N/A
1/6   43/17/30/+4/0.00/0.0/553/100          24 SW              RMY 24
1/7   43/25/34/+8/0.00/0.0/521/94           21 SW              RMY N/A
1/8   40/28/34/+8/T/0.0/000/00              28 E   AERO 25 ENE RMY 25
1/9   39/36/38/+12/T/0.0/000/00             21 ENE AERO 20 ENE RMY N/A 
1/10  58/38/48/+23/1.55/0.0/000/00          53 SSE AERO 55 SSE RMY 53
1/11  48/21/35/+10/0.00/0.0/559/100         43 W   AERO 45 WSW RMY N/A
1/12  35/19/27/+2/..../.../359/64           30 SE  AERO N/A    RMY N/A
1/13  30/17/24/-1/..../.../551/98           50 W   AERO 58 W   RMY 54
1/14  28/17/23/-2/T/T/.../..                26 W   AERO N/A    RMY 25
1/15  40/23/32/+7/0.00/0.0/.../..           26 ESE AERO 25 ESE RMY 23
1/16  41/32/37/+12/1.03/T/.../..            32 NNW AERO 32 NNW RMY 28
1/17  33/26/30/+5/..../.../.../..           29 WNW AERO 28 WNW RMY N/A
1/18  26/15/21/-4/..../.../.../..           50 W   AERO 50 W   RMY 47
1/19  22/13/18/-7/0.00/0.0/.../..           55 WNW AERO 59 W   RMY 55
1/20  30/15/23/-2/0.00/0.0/.../..           46 WNW AERO 47 WNW RMY 45

1/21 low since midnight is 16F; normal low is now 17F  

DAILY RECORDS FOR JANUARY 2016

**1/10/16: NEW DAILY RECORD MAXIMUM TEMPERATURE OF 58F, BREAKS
PREVIOUS RECORD OF 54F SET BACK IN 2000**

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

RECORDS FOR JANUARY 21
HIGH 65F IN 1906
LOW -4F IN 1888,1893
PRECIP 2.49 INS. IN 1979
SNOWFALL 9.0 INS. IN 2014
PEAK GUST 78e MPH SE IN 1979

RECORDS FOR JANUARY 22
HIGH 59F IN 1916
LOW -8F IN 1888,1976
PRECIP 1.24 INS. IN 1891,1987
SNOWFALL 10.0 INS. IN 2005
PEAK GUST 67 MPH W IN 1976

TODAY'S REPORT PREPARED BY: Brian Fitzgerald