BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, JANUARY 15, 2018 ALL TIMES ARE IN EASTERN STANDARD TIME BANDS OF SNOW SHOWERS AND THE RETURN OF BELOW SEASONABLE TEMPERATURES AFTER RECORD BREAKING WARMTH.... Our maximum temperatures dropped 39 degrees this weekend between Saturday and Sunday. On Saturday we reached a daily record breaking maximum of 60F. This 26F degrees above the normal for 1/13. Then after a wind shift temperatures began to drop and we recorded a high of 21F yesterday. This is 12 degrees below the daily normal of 33F. Today temperatures have been even colder with a high of 14F so far, which is 19F degrees below the daily normal. Continuous although very light at times bands of snow showers began after 5:00 AM this morning on top of Great Blue Hill. So far we have measured 0.5 ins. by 1:00 PM. Skies have remained overcast for most of the day with a short break in the clouds midday to the west allowing for 75 miles of visibility. Most of the day visibility was obscured by a distant fog. Today's Observations: 7 A.M. Weather: Light snow and fog, overcast nimbostratus Temperature: 11F; Dew Point: 5F; Wind: NNW at 10G16 kts Sea-level pressure: 30.71 ins. Hg, rising then falling Visibility: 5 miles, except E-WSW 15 miles 6-hr Max temp: 14F 6-hr Min temp: 11F 24-hr precip: 0.01 ins. 24-hr snowfall: 0.2 ins. Snow depth: 0 ins. BHO SA 1155 E26 OVC 5S-F 400/11/05/3410G16/071/ NEW SNW PST 24 HRS 0.2 INS VSBY E-WSW 15 DSNT FG E-WSW/ 8/6// 50005 MANUAL 70001 10014 20011 10 A.M. Weather: Light snow, overcast nimbostratus Temperature: 12F; Dew Point: 4F; Wind: NNW at 13G17 kts Sea-level pressure: 30.71 ins. Hg, rising then falling Visibility: 75 miles, except NNE-SSW 35 3-hr precip: 0.01 ins. 3-hr snowfall: 0.3 ins. BHO SA 1455 E22 BKN 75S- 401/12/04/3413G17/071/ NEW SNW PST 3 HRS 0.3 INS VSBY NNE-SSW 35 DSNT FG ALQDS/ 8/600 50001 MANUAL 6001/ ASOS 60001 1 P.M. Weather: Very light snow, overcast nimbostratus Temperature: 13F; Dew Point: 6F; Wind: NNW at 11G16 kts Sea-level pressure: 30.61 ins. Hg, falling, then more slowly Visibility: 10 miles 6-hr Max temp: 14F 6-hr Min temp: 11F 6-hr precip: 0.01 ins. 6-hr snowfall: 0.3 ins. Snow depth: 1 in. BHO SA 1755 E15 OVC 10S- 366/13/06/3411G16/061/ NEW SNW PST 6 HRS 0.3 INS DSNT FG ALQDS PCPN VRY LGT/ 8/6// 4/001 58035 MANUAL 6001/ ASOS 60001 10014 20011 SUMMARY FOR SUNDAY, JANUARY 14, 2018 TEMPERATURE (DEGREES F) MAX.....21 NORMAL.....33 MIN.....11 NORMAL.....17 MEAN....16 NORMAL.....25 DEPARTURE FROM 30-YEAR NORMAL...........................-9 TOTAL DEPARTURE FOR THE MONTH..........................-57 [-4.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY.............49 DEPARTURE..........+9 TOTAL HEATING UNITS FOR THE MONTH............606 DEPARTURE.........+58 TOTAL HEATING UNITS FOR THE SEASON..........2728 DEPARTURE........-124 TOTAL HEATING UNITS LAST SEASON TO DATE.....2515 DIFFERENCE.......+213 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................30 NW AT 1:05 A.M.* AERO........................30 NW AT 1:05 A.M.* ASOS........................30 NW AT 1:06 A.M. DAVIS.......................30 N/A AT 1:05 A.M.** RMY N/A FASTEST MILE FOR YESTERDAY.....................23 NW AT 2:51 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................22 NW AT 12:59 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................21 N/A AT 12:59 A.M.** AVERAGE WIND SPEED AND DIRECTION.............11.1 NW ASOS......................11.6 DAVIS.....................10.1 N/A * LAST OF SEVERAL OCCURANCES ** DAVIS DIRECTION MALFUCNTIONING PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01 DEPARTURE......-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........3.97 DEPARTURE......+1.98 ASOS..............4.39 TOTAL PRECIPITATION FOR THE YEAR...........3.97 DEPARTURE......+1.98 ASOS..............4.39 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.2 DEPARTURE........-0.4 TOTAL SNOWFALL FOR THE MONTH...............16.7 DEPARTURE........+8.8 TOTAL SNOWFALL FOR THE SEASON..............26.0 DEPARTURE........+2.1 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/.../.. 30 NW AERO 30 NW RMY 31 1/02 15/-2/7/-20/0.00/0.0/.../.. 26 W AERO 25 W RMY 26 1/03 28/11/20/-6/0.00/0.0/.../.. 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/.../.. 53 W AERO 53 W RMY 57 1/06 10/-2/4/-22/0.00/0.0/.../.. 43 WSW AERO 47 WSW RMY 47 1/07 14/-8/3/-23/0.00/0.0/.../.. 37 WNW AERO 35 WNW RMY N/A 1/08 33/14/24/-2/T/T/.../.. 40 S AERO 40 S RMY 42 1/09 40/25/33/+7/T/T/.../.. 37 W AERO 35 W RMY 33 1/10 36/20/28/+3/0.00/0.0/.../.. 30 W AERO 30 W RMY N/A 1/11 50/32/41/+16/0.00/0.0/.../.. 33 S AERO 32 S RMY 34 1/12 60/45/53/+28/..../0.0/.../.. 56 S AERO 56 S RMY 55 1/13 60/17/39/+14/T/0.0/.../.. 58 SSW AERO 60 SSW RMY 62 1/14 21/11/16/-9/0.00/0.0/.../.. 30 NW AERO 30 NW RMY N/A 1/15 Low temp since midnight is 11F; 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 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: Kaitlin Geagan