Monday, January 22, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JANUARY 22, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

FOG THICKENS AS RAIN CONTINUES TO FALL ON TOP
OF GREAT BLUE HILL…

Temperatures have returned to closer to seasonable
today after an above average day yesterday. Yesterday
the high was 47F, this is 13 degrees above the daily
normal of 34F. So far today we have reached a
maximum of 37F, which is 3 degrees above normal.
Visibility has decreased from 25 miles to 1/4 mile by
1:00 PM due to fog and a relative humidity of 100%. A
light rain began early this morning and has continued
throughout the day. So far today we have measured
0.07 ins. of precipitation. The wind has remained
light today with a shift from S- NNE this afternoon.

Today’s Observations:

7 A.M.
Weather: Very light drizzle, overcast nimbostratus
Temperature: 35F; Dew Point: 31F; Wind: S at 6 kts,
Wind: Light
Sea-level pressure: 30.22 ins. Hg, rising, then more quickly
Visibility: 25 miles, except WNW-NNE 15 miles
6-hr Max temp: 35F
6-hr Min temp: 34F
24-hr precip: 0.01 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E20 OVC 25L- 234/35/31/1706/022/ PCPN VRY LGT
VSBY WNW-NNE 15 DSNT FG ALQDS WND LGT/ 8/6// 53006 MANUAL
70001 ASOS 70001 10035 20034

10 A.M.
Weather: Light drizzle and fog, overcast nimbostratus
Temperature: 35F; Dew Point: 34F; Wind: (E) SSW at 2 kts,
Wind: Light
Sea-level pressure: 30.30 ins. Hg, rising, then more quickly
Visibility: variable 1/2 to 1 mile, except ENE-WSW 5 miles
3-hr precip: 0.05 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 E16 OVC 1/2V1L-F 260/35/34/E2002/030/ VSBY ENE-WSW 5
PTCHS FG DRFTG BLO SMT WND LGT/ 8/6// 53026 MANUAL 6005/
ASOS 60005

1 P.M.
Weather: Very light drizzle and fog, overcast nimbostratus
Temperature: 35F; Dew Point: 35F; Wind: NE at 6 kts,
Wind: Light
Sea-level pressure: 30.25 ins. Hg, falling, then more quickly
Visibility: 1/2 mile
6-hr precip: 0.06 ins.
6-hr snowfall: 0.0 ins.
6-hr Max temp: 37F
6-hr Min temp: 35F
Snow depth: 0 ins.
BHO SA 1755 E5 OVC 1/2L-F 245/35/35/0406/025/ PCPN VRY LGT
WND LGT/ 8/6// 56015 MANUAL 6006/ ASOS 60007 10037 20035

SUMMARY FOR SUNDAY, JANUARY 21, 2018

TEMPERATURE (DEGREES F)
MAX…..47   NORMAL…..34
MIN…..34   NORMAL…..17
MEAN….41   NORMAL…..25

DEPARTURE FROM 30-YEAR NORMAL……………………..+16
TOTAL DEPARTURE FOR THE MONTH……………………..-35 [-1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….24  DEPARTURE………-16
TOTAL HEATING UNITS FOR THE MONTH…………864  DEPARTURE………+36
TOTAL HEATING UNITS FOR THE SEASON……….2986  DEPARTURE……..-147
TOTAL HEATING UNITS LAST SEASON TO DATE…..2723  DIFFERENCE…….+263

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….22  WSW AT 12:17 A.M.
AERO……………………21  W   AT 12:01 A.M.
ASOS……………………24  W   AT 12:01 A.M.
DAVIS…………………..22  M   AT 12:01 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………16  W   AT 12:03 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17  WNW AT 12:01 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15  M   AT 12:01 A.M.
AVERAGE WIND SPEED AND DIRECTION……………6.7 W
ASOS……………………6.7
DAVIS…………………..6.2
*Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.13
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….4.20  DEPARTURE……+1.22
ASOS…………..4.64
TOTAL PRECIPITATION FOR THE YEAR………..4.20  DEPARTURE……+1.22
ASOS…………..4.64

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH……………19.3  DEPARTURE……..+7.6
TOTAL SNOWFALL FOR THE SEASON…………..28.6  DEPARTURE……..+0.9

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

1/01 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/…/00        20 SE  AERO 17 SE  RMY N/A
1/18 29/16/23/-2/0.00/0.0/…/..        24 NW  AERO 23 NW  RMY 26
1/19 34/17/26/+1/0.00/0.0/…/..        22 SSW AERO 20 SSW RMY N/A
1/20 45/27/36/+11/0.00/0.0/…/..       38 WSW AERO 37 WSW RMY 39
1/21 47/34/41/+16/0.00/0.0/…/..       22 W   AERO 21 W   RMY N/A

1/22 Low temp since midnight is 34F; 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: DAILY RECORD LOW MINIMUM TEMPERATURE OF -8F,
PREVIOUS RECORD OF -7F WAS SET IN 1896

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

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

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

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

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

RECORDS FOR JANUARY 23
HIGH 62F IN 1906
LOW -10F IN 1976
PRECIP 2.40 INS. IN 1935
SNOWFALL 14.6 INS. IN 1966
PEAK GUST 85 MPH S IN 1992

TODAY’S REPORT PREPARED BY: Kaitlin Ann Geagan