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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, FEBRUARY 2, 2018  
ALL TIMES ARE IN EASTERN STANDARD TIME

SKIES CLEAR AFTER EARLY MORNING SNOWSTORM...

An early morning snow storm accumulated to 2.5 ins
on top of Great Blue Hill. Temperatures have 
remained much cooler today than yesterday's max of
45F. So far today the warmest was 34F at 3:00 A.M.
Temperatures have continue to decrease since then.
Also around 3:00 the wind began to shift from the
south to the NW. This is what caused the drop in
temperatures today. Early this morning while the
snow was still falling the visibility was variable
from 1 to 2 miles. As the humidity dropped and the
skies cleared we had an 80 miles by 1:00 P.M.

PRELIMINARY STATS FOR JANUARY 2018
 
TEMPERATURE, Deg. F
Avg. Max. 33.8  [0.0]
Avg. Min. 18.3 [+1.2]
Mean      26.1 [+0.6]
24-hour corrected mean: 26.4
Max. for month: 60F on 12th and 13th
Min. for month: -8F on  7th
 
HEATING DEGREE DAYS
Total heating units:  1199  [-27] 
Total for the season: 3321 [-210]
Total for last season: 3027

PRECIPITATION, Inches
Total: 6.00 [+1.65]
Greatest in 24 hrs: 2.28 on the 12-13th

SNOWFALL, Inches
Total: 25.2 [+8.0]
Greatest in 24 hrs: 16.5 in. on 4th
 
WIND, mph
Avg. uncorrected wind speed: 14.7
Avg. corrected wind speed: 15.0
Prevailing wind direction: W at 16%
Peak gust and direction: 58 SSW on 13th
 
SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes: N/A

Today's Observations:

7 A.M.
Weather: Light snow and fog, overcast nimbostratus 
Temperature: 30F; Dew Point: 30F; Wind: NW at 15G27 kts,
Peak wind: 28 kts (32 MPH) at 06:44 A.M. 
Sea-level pressure: 29.74 ins. Hg, rising, then more slowly
Visibility: 1 to 2 miles variable 
6-hr Max temp: 34F
6-hr Min temp: 30F
24-hr precip: 0.30 ins.
24-hr snowfall: 2.4 ins.
Snow depth: 4 ins.
BHO SA 1155 E11 OVC 1V2S-F 070/30/30/31215G27/974/ 
NEW SNW PST 24 HRS 2.4 INS PK WND 3128/44/ 8/6// 
4/004 51007 MANUAL 70030 ASOS 70030 10034 20030

10 A.M.
Weather: Broken stratocumulus, broken altostratus, 
sun dimly visible 
Temperature: 25F; Dew Point: 16F; Wind: WNW at 19G28 kts,
Peak wind: 32 kts ( 37 MPH) at 09:41 A.M.
Sea-level pressure: 29.81 ins. Hg, rising, then more slowly 
Visibility: 50 miles
3-hr precip: 0.01 ins.
3-hr snowfall: 0.1 ins. 
BHO SA 1455 E65 BKN 80 BKN 50 095/25/16/2919G28/981/ 
NEW SNW PST 3 HRS 0.1 INS SUN DMLY VSBL PK WND 2932/41/ 
8/520 51025 MANUAL 6001/ ASOS 60002
 
1 P.M.
Weather: Scattered stratocumulus 
Temperature: 24F; Dew Point: 12F; Wind: WNW at 16G31 kts
Sea-level pressure: 29.83 ins. Hg, steady then rising 
Visibility: 70 miles
6-hr Max temp: 30F
6-hr Min temp: 21F
6-hr precip: 0.01 ins.
6-hr snowfall: 0.1 ins.
Snow depth: 3 ins. 
BHO SA 1755 E42 SCT 70 100/24/12/2916G31/983/ NEW SNW PST 6 HRS 
0.1 INS PK WND 3034/24/ 8/500 4/003 50005 MANUAL 6001/ 
ASOS 60002 10030 20021 

SUMMARY FOR THURSDAY, FEBRUARY 1, 2018

TEMPERATURE (DEGREES F)
MAX.....45   NORMAL.....34
MIN.....27   NORMAL.....17
MEAN....36   NORMAL.....26

DEPARTURE FROM 30-YEAR NORMAL...........................+10
TOTAL DEPARTURE FOR THE MONTH...........................+10 [+9.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY.............29   DEPARTURE.........-10
TOTAL HEATING UNITS FOR THE MONTH.............29   DEPARTURE.........-10
TOTAL HEATING UNITS FOR THE SEASON..........3350   DEPARTURE........-220
TOTAL HEATING UNITS LAST SEASON TO DATE.....3059   DIFFERENCE.......+291

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY....................36 SSW AT 12:09 A.M. 
                   AERO.........................32 SSW AT 12:11 A.M.
                   ASOS.........................35 SSW AT 12:11 A.M.
                   DAVIS........................34 M   AT 12:10 A.M.** RMY N/A 
FASTEST MILE FOR YESTERDAY......................26 SSW AT 12:23 A.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE...................26 SSW AT 12:25 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..................25 M   AT 12:25 A.M.**
AVERAGE WIND SPEED AND DIRECTION..............14.9 S
                   ASOS.......................15.1
                   DAVIS......................14.9 ** 
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.30  DEPARTURE......+0.17
                         ASOS..............0.30
TOTAL PRECIPITATION FOR THE MONTH..........0.30  DEPARTURE......+0.17
                         ASOS..............0.30
TOTAL PRECIPITATION FOR THE YEAR...........6.30  DEPARTURE......+1.82
                         ASOS..............6.88

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........2.4  DEPARTURE........+1.9
TOTAL SNOWFALL FOR THE MONTH................2.4  DEPARTURE........+1.9
TOTAL SNOWFALL FOR THE SEASON..............36.9  DEPARTURE........+3.2

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/+28/0.89/0.0/011/02       56 S   AERO 56 S   RMY 55
1/13 60/17/39/+14/1.39/0.0/265/47       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/+5/0.00/0.0/455/78        36 WNW AERO 35 WNW RMY 36 
1/25 29/17/23/-2/0.00/0.0/556/95        35 WNW AERO 36 WNW RMY 41 
1/26 32/15/24-1/0.00/0.0/581/99         28 WNW AERO 28 WNW RMY N/A
1/27 52/24/38/+13/..../0.0/406/69       43 SSW AERO 44 SSW RMY N/A
1/28 50/39/45/+20/..../0.0/000/00       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 29/12/21/-5/0.00/0.0/.../..        36 S   AERO 32 S   RMY 35 

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

PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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

2/1 45/27/36/+10/..../0.0/.../..      36 SSW AERO 35 SSW RMY N/A 

2/2 Low temp since midnight is 21F; normal low is now 17F

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

RECORDS FOR FEBRUARY 2
HIGH 55F IN 1951, 1973
LOW -12F IN 1961
PRECIP 1.91 INS. IN 1999
SNOWFALL 16.5 INS. IN 2015
PEAK GUST 92 MPH SW IN 1970

RECORDS FOR FEBRUARY 3
HIGH 58F IN 1991
LOW -7F IN 1955
PRECIP 2.14 INS. IN 1970
SNOWFALL 7.0 INS. IN 1913
PEAK GUST 102 MPH S IN 1970 [RECORD FOR MONTH]

TODAY'S REPORT PREPARED BY: Kaitlin Geagan