Thursday, February 1, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, FEBRUARY 1, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

WITH WINDS FROM THE SOUTH FEBRUARY
IS OFF TO A WARMER THAN AVERAGE START…

Temperatures have risen 32 degrees since yesterday
morning’s minimum of 12F. So far today we have had
a high of 44F, which is 10 degrees above the daily
normal of 34F. The wind changed direction yesterday
afternoon from the WNW-S and have continued to be
from the south today. The wind has picked up
throughout the day frequently gusting over 22 kts
(25 MPH) in the afternoon.

January had many fluctuations in temperature but the
average for the month ended just slightly above
normal. The month also was well above normal for
precipitation, especially snow.

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: Broken altocumulus, overcast cirrostratus
Temperature: 30F; Dew Point: 24F; Wind: WNW at 9 kts
Sea-level pressure: 30.14 ins. Hg, rising unsteadily
Visibility: 35 miles
6-hr Max temp: 30F
6-hr Min temp: 28F
24-hr precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 3 ins.
BHO SA 1155 E100 BKN E200 OVC 35 164/30/24/2012/014/
DSNT FG ALQDS/ 8/056 4/003 55001 10030 20028

10 A.M.
Weather: Broken altocumulus, overcast cirrostratus,
sun dimly visible
Temperature: 35F; Dew Point: 24F; Wind: S at 15 kts
Sea-level pressure: 29.99 ins. Hg, falling, then more slowly
Visibility: 40 miles, distant fog in all directions
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 E70 BKN E120 OVC 40 155/35/24/1915/999/ DSNT FG
ALQDS SUN DMLY VSBL/ 8/050 56009

1 P.M.
Weather: Overcast cirrostratus, few altocumulus S-SSW
Temperature: 44F; Dew Point: 28F; Wind: SSW at 13G22 kts
Sea-level pressure: 29.91 ins. Hg, falling, then more slowly
Visibility: 40 miles, distant fog in all directions
6-hr Max temp: 44F
6-hr Min temp: 30F
6-hr precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
Snow depth: 2 ins.
BHO SA 1755 E250 OVC 40 128/44/28/2013G22/991/ FEW AC S-SSW
DSNT FG ALQDS/ 8/057 4/002 58027 10044 20030

SUMMARY FOR WEDNESDAY, JANUARY 31, 2018

TEMPERATURE (DEGREES F)
MAX…..29   NORMAL…..34
MIN…..12   NORMAL…..17
MEAN….21   NORMAL…..26

DEPARTURE FROM 30-YEAR NORMAL……………………….-5
TOTAL DEPARTURE FOR THE MONTH……………………….+1 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….44   DEPARTURE……….+5
TOTAL HEATING UNITS FOR THE MONTH………..1199   DEPARTURE………-27
TOTAL HEATING UNITS FOR THE SEASON……….3321   DEPARTURE……..-210
TOTAL HEATING UNITS LAST SEASON TO DATE…..3027   DIFFERENCE…….+294

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..36 S   AT 11:41 P.M.
AERO…………………….32 S   AT 11:42 P.M.
ASOS…………………….37 SSW AT 11:43 P.M.
DAVIS……………………33 M   AT 11:42 P.M.** RMY 35
FASTEST MILE FOR YESTERDAY………………….25 S   AT  9:50 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….25 S   AT  9:50 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………24 M   AT  9:50 P.M.**
AVERAGE WIND SPEED AND DIRECTION…………..13.2 S
ASOS…………………..12.9
DAVIS………………….12.0 **
** Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….6.00  DEPARTURE……+1.65
ASOS…………..6.58
TOTAL PRECIPITATION FOR THE YEAR………..6.00  DEPARTURE……+1.65
ASOS…………..6.58

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH……………25.2  DEPARTURE……..+8.0
TOTAL SNOWFALL FOR THE SEASON…………..34.5  DEPARTURE……..+1.3

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/…/..        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 29/12/21/-5/0.00/0.0/…/..        36 S   AERO 32 S   RMY 35

2/1 Low temp since midnight is 27F; 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 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

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

TODAY’S REPORT PREPARED BY: Kaitlin Geagan