Sunday, January 15, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JANUARY 15, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

WARMER TEMPERATURES TODAY WITH CLEAR SKIES…

Temperatures are on a bit of a roller coaster after the record high
temperatures on Thursday, After a 36 degree temperature drop in
just over 31 hours, The temperature hit a low of 14F yesterday
morning before rebounding into the 30’s yesterday afternoon.  The
temperatures once again reached low in the lower 20s but are rising
under clear skies at the summit this morning.

Today’s Observations:

7 A.M.
Weather: Clear, few cumulus distant offshore E-SE
Temperature: 24F; Dew Point: 18F; Wind: SW at 10 kts
Sea-level pressure: 30.25 ins. Hg steady then increasing
Visibility: 50 miles
6-hr Max temp: 27F
6-hr Min temp: 23F
24-hr precip: 0.00 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 CLR 50 243/24/18/3210/025/ FEW CU DSNT OFFSHR E-ESE/
8/100 53008 10027 20023

10 A.M.
Weather: Clear, few cumulus distant W-NNW
Temperature: 29F; Dew Point: 15F; Wind: WNW at 11 kts
Sea-level pressure: 30.30 ins. Hg, rising then more quickly
Visibility: 50 miles
BHO SA 1455 CLR 50 262/29/15/3111/030/ FEW CU DSNT W-NNW/ 8/100 51019

1 P.M.
Weather: Clear, few stratocumulus distant offshore NE-SE,
Temperature: 33F; Dew Point: 14F; Wind: NW at 10 kts
Sea-level pressure: 30.29 ins. Hg, falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 33F
6-hr Min temp: 27F
BHO SA 1755 CLR 70 250/33/14/3210/029/ FEW CU DSNT OFFSHR NE-SE/
8/100 58012 10033 20027

SUMMARY FOR SATURDAY, JANUARY 14, 2017

TEMPERATURE (DEGREES F)
MAX…..30   NORMAL…..33
MIN…..14   NORMAL…..17
MEAN….22   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL…………………..-3
TOTAL DEPARTURE FOR THE MONTH…………………..+66 [+5.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..43   DEPARTURE………+3
TOTAL HEATING UNITS FOR THE MONTH………….483   DEPARTURE………-65
TOTAL HEATING UNITS FOR THE SEASON………..2515   DEPARTURE……..-337
TOTAL HEATING UNITS LAST SEASON TO DATE……2140   DIFFERENCE…….+375

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….20 SSW AT 8:08 P.M.
ASOS……………………22 SSW AT 8:49 P.M.
DAVIS…………………..21  SW AT 7:47 P.M.  RMY 22
FASTEST MILE FOR YESTERDAY…………………17 SSW AT 8:47 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 SSW AT 8:01 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16  SW AT 8:46 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.0 SSW
ASOS…………………..8.1
DAVIS………………….7.0 W [269]

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……….2.60  DEPARTURE……+0.61
ASOS…………..2.85
TOTAL PRECIPITATION FOR THE YEAR………..2.60  DEPARTURE……+0.61
ASOS…………..2.85

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.6
TOTAL SNOWFALL FOR THE MONTH……………11.2  DEPARTURE…….+3.3
TOTAL SNOWFALL FOR THE SEASON…………..19.0  DEPARTURE…….-4.9

PRELIMINARY CLIMATE SUMMARY FOR JANUARY 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

1/1   41/29/35/+8/0.09/0.0/…/..           35 W   AERO 36 W   RMY 34
1/2   38/29/34/+7/0.00/0.0/…/..           21 E   AERO 20 E   RMY N/A
1/3   42/37/40/+14/1.14/0.0/000/00          39 ENE AERO 41 ENE RMY 34
1/4   44/30/37/+11/0.11/T/…/..            41 WNW AERO 46 WNW RMY 45
1/5   30/23/27/+1/0.00/0.0/…/..           37 W   AERO 39 W   RMY 38
1/6   30/20/25/-1/0.05/1.7/…/..           20 W   AERO 20 W   RMY N/A
1/7   22/14/18/-8/0.74/9.5/…/..           32 NNW AERO 39 NNW RMY 38
1/8   20/06/13/-13/0.01/T/…/..            26 NNW AERO 29 NNW RMY N/A
1/9   17/4/11/-15/0.00/0.0/…/..           23 SSW AERO 23 SSW RMY 25
1/10  41/14/28/+3/0.18/0.0/…/..           35 SE  AERO 37 SE  RMY N/A
1/11  53/40/47/+22/0.13/0.0/…/..          51 SSW AERO 48 SSW RMY 57
1/12  59/42/51/+26/0.15/0.0/…/..          37 SSW AERO 40 S   RMY 40
1/13  55/23/39/+14/0.00/0.0/…/..          39 WNW AERO 43 WNW RMY 42
1/14  30/14/22/-3/0.00/0.0/…/..           20 SSW AERO 20 SSW RMY 22

1/15 Low temp since midnight is 23F; normal low is now 17F

DAILY RECORDS FOR JANUARY 2017

1/12/17: NEW DAILY RECORD HIGH MAXIMUM TEMP. OF 59F,
PREVIOUS RECORD WAS 57F SET 1913 AND TIED IN 1975
1/12/17: NEW DAILY RECORD HIGH MINIMUM TEMP. OF 42F,
PREVIOUS RECORD WAS 40F SET 2006

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

RECORDS FOR JANUARY 15
HIGH 64F IN 1995
LOW -16F IN 1957 [RECORD FOR MONTH] PRECIP 2.63 INS. IN 1958
SNOWFALL 8.8 INS. IN 1983
PEAK GUST 69e MPH SE IN 1940

RECORDS FOR JANUARY 16
HIGH 63F IN 1995
LOW -12F IN 2004
PRECIP 1.32 INS. IN 1936
SNOWFALL 14.0 INS. IN 1965
PEAK GUST 79 MPH WNW IN 1960

TODAY’S REPORT PREPARED BY: Robert Millette