Wednesday, January 31, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JANUARY 31, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

COLD, CLEAR, AND DRY DAY…

Yesterday we had snow start early in the
morning and a total of 5.9 inches accumulated.
Today started off very clear with only a
few clouds in the sky. The cloud cover
increased throughout the day and we had
scattered cirrus by 1:00 P.M. Humidity
was low and decreased throughout the day.
This allowed for excellent visibility today
with 80 miles by 10:00 A.M. Wind from the
WNW began moderate but was light by the
afternoon.

Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant offshore ENE-E
Temperature: 12F; Dew Point: 7F; Wind: WNW at 9 kts
Sea-level pressure: 30.15 ins. Hg, rising unsteadily
Visibility: 70 miles
6-hr Max temp: 18F
6-hr Min temp: 12F
24-hr precip: 0.15 ins.
24-hr snowfall: 2.3 ins.
Snow depth: 6 ins.
BHO SA 1155 CLR 70 211/12/07/2909/015/ NEW SNW PST 24 HRS
2.3 INS FEW SC DSNT OFFSHR ENE-E/ 8/500 4/006 52021 MANUAL
70015 ASOS 70019 10018 20012

10 A.M.
Weather: Clear Few cumulus along the horizon E, few
cirrostratus SSW
Temperature: 20F; Dew Point: 4F; Wind: W at 9 kts
Sea-level pressure: 30.22 ins. Hg, rising, then more slowly
Visibility: 80 miles
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 CLR 80 232/20/04/2809/022/ FEW CU DSNT ALG HRZN
E FEW CS SSW/ 8/105 51021

1 P.M.
Weather: Scattered cirrostratus
Temperature: 25F; Dew Point: 6F; Wind: WSW at 6 kts,
Wind: Light
Sea-level pressure: 30.15 ins. Hg, falling, then more rapidly
Visibility: 80 miles
6-hr Max temp: 27F
6-hr Min temp: 12F
6-hr precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 4 ins.
BHO SA 1755 E250 SCT 80 209/25/06/2506/015/ WND LGT/ 8/006
4/004 56023 10027 20012

SUMMARY FOR TUESDAY, JANUARY 30, 2018

TEMPERATURE (DEGREES F)
MAX…..27   NORMAL…..34
MIN…..17   NORMAL…..17
MEAN….22   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL……………………….-4
TOTAL DEPARTURE FOR THE MONTH……………………….+6 [+0.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….43   DEPARTURE……….+3
TOTAL HEATING UNITS FOR THE MONTH………..1155   DEPARTURE………-32
TOTAL HEATING UNITS FOR THE SEASON……….3277   DEPARTURE……..-215
TOTAL HEATING UNITS LAST SEASON TO DATE…..2984   DIFFERENCE…….+293

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..35 NW AT 10:39 P.M.
AERO…………………….35 NW AT 10:38 P.M.
ASOS…………………….36 NW AT 10:39 P.M.
DAVIS……………………34 M  AT 10:38 P.M.** RMY 38
FASTEST MILE FOR YESTERDAY………………….23 NW AT 10:39 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 NW AT 11:52 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………23 M  AT 11:51 P.M.**
AVERAGE WIND SPEED AND DIRECTION…………..14.0 NW
ASOS…………………..14.4
DAVIS………………….12.5 **
* Estimated
** Davis direction malfunctioning
*** Last of multiple occurences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.15  DEPARTURE……+0.01
ASOS…………..0.19
TOTAL PRECIPITATION FOR THE MONTH……….6.00  DEPARTURE……+1.78
ASOS…………..6.58
TOTAL PRECIPITATION FOR THE YEAR………..6.00  DEPARTURE……+1.78
ASOS…………..6.58

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….2.3  DEPARTURE……..+1.8
TOTAL SNOWFALL FOR THE MONTH……………25.2  DEPARTURE……..+8.5
TOTAL SNOWFALL FOR THE SEASON…………..34.5  DEPARTURE……..+1.8

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

1/01 11/-5/3/-24/0.00/0.0/538/98     30 NW  AERO 30 NW  RMY 31
1/02 15/-2/7/-20/0.00/0.0/402/73     26 W   AERO 25 W   RMY 26
1/03 28/11/20/-6/0.00/0.0/430/78     23 WSW AERO 20 WSW RMY N/A
1/04 28/18/23/-3/1.66/16.5/000/00    54 NNW AERO 60 NNW RMY 64
1/05 18/2/10/-16/0.00/0.0/431/78     53 W   AERO 53 W   RMY 57
1/06 10/-2/4/-22/0.00/0.0/554/100    43 WSW AERO 47 WSW RMY 47
1/07 14/-8/3/-23/0.00/0.0/549/99     37 WNW AERO 35 WNW RMY N/A
1/08 33/14/24/-2/0.02/T/006/01       40 S   AERO 40 S   RMY 42
1/09 40/25/33/+7/T/T/356/64          37 W   AERO 35 W   RMY 33
1/10 36/20/28/+3/0.00/0.0/553/99     30 W   AERO 30 W   RMY N/A
1/11 50/32/41/+16/0.00/0.0/056/10    33 S   AERO 32 S   RMY 34
1/12 60/45/53/+28/…./0.0/011/02    56 S   AERO 56 S   RMY 55
1/13 60/17/39/+14/…./0.0/265/47    58 SSW AERO 60 SSW RMY 62
1/14 21/11/16/-9/0.00/0.0/350/62     30 NW  AERO 30 NW  RMY N/A
1/15 18/11/15/-10/0.02/0.5/000/00    23 NNW AERO 21 N   RMY 23
1/16 31/18/25/0/0.00/0.0/153/27      17 SSE AERO 15 SSE RMY N/A
1/17 32/29/31/+6/0.23/2.3/000/00     20 SE  AERO 17 SE  RMY N/A
1/18 29/16/23/-2/0.00/0.0/497/87     24 NW  AERO 23 NW  RMY 26
1/19 34/17/26/+1/0.00/0.0/229/40     22 SSW AERO 20 SSW RMY N/A
1/20 45/27/36/+11/0.00/0.0/161/28    38 WSW AERO 37 WSW RMY 39
1/21 47/34/41/+16/0.00/0.0/467/81    22 W   AERO 21 W   RMY N/A
1/22 37/34/36/+11/…./0.0/000/00    21 E   AERO 16 E   RMY N/A
1/23 55/33/44/+19/…./0.0/000/00    53 S   AERO 58 S   RMY 57
1/24 37/22/30/+5/0.00/0.0/…/..     36 WNW AERO 35 WNW RMY 36
1/25 29/17/23/-2/0.00/0.0/…/..     35 WNW AERO 36 WNW RMY 41
1/26 32/15/24-1/0.00/0.0/…/..      28 WNW AERO 28 WNW RMY N/A
1/27 52/24/38/+13/…/0.0/…/..     43 SSW AERO 44 SSW RMY N/A
1/28 50/39/45/+20/…./0.0/…/..    35 SSW AERO 37 SSW RMY N/A
1/29 39/25/32/+7/…./…/000/00     37 NNE AERO 32 NNE RMY 35
1/30 27/17/22/-4/…./5.9/000/00     35 NW  AERO 35 NW  RMY 38

1/31 Low temp since midnight is 12F; normal low is now 17F

DAILY RECORDS FOR JANUARY 2018

01/04/18: NEW DAILY RECORD MAXIMUM SNOWFALL OF 16.5 INS.
PREVIOUS RECORD WAS 8.6 INS. SET IN 1923 AND
TIED IN 1942

01/07/18: NEW DAILY RECORD LOW MINIMUM TEMPERATURE OF
-8F, PREVIOUS RECORD OF -7F WAS SET IN 1896

01/12/18: NEW DAILY RECORD HIGH MINIMUM TEMPERATURE OF
45F, PREVIOUS RECORD OF 42F WAS SET IN 2017

NEW DAILY RECORD HIGH MAXIMUM TEMPERATURE OF
60F, PREVIOUS RECORD OF 59F WAS SET IN 2017

01/13/18: NEW DAILY RECORD HIGH MAXIMUM TEMPERATURE OF
60F, PREVIOUS RECORD OF 57F WAS SET IN 1890
AND TIED IN 1932

01/28/18: TIED DAILY RECORD HIGH MINIMUM TEMPERATURE OF
39F, PREVIOUS RECORD OF 39F WAS SET IN 1974

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

RECORDS FOR JANUARY 31
HIGH 58F IN 1913, 1947, 2013
LOW -12F IN 1920
PRECIP 1.03 INS. IN 1914
SNOWFALL 9.0 INS. IN 1898
PEAK GUST 75 MPH NW IN 1974

RECORDS FOR FEBRUARY 1
HIGH 65F IN 1989
LOW -9F IN 1920
PRECIP 1.30 INS. IN 1898
SNOWFALL 11.0 INS. IN 1898
PEAK GUST 66e MPH SSW IN 1951

TODAY’S REPORT PREPARED BY: Kaitlin Geagan