BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, APRIL 5, 2018 ALL TIMES ARE IN EASTERN STANDARD TIME BLUSTERY DAY WITH CLEAR SKIES AND EXCELLENT VISIBILITY... Skies were clear today after yesterday's rain storm. For most of the day yesterday we observed drizzle but the rain became heavy for a short period around 3:00 P.M. yesterday and we measured a storm total 0.75 ins. of rainfall today. We had strong wind from the WNW today with frequent gust over 35 kts (40 MPH). So far today we have a peak gust of 46 kts (53 MPH) which happened at 1:30 A.M. After a 3 degree above seasonable high of 54F we are back to below seasonable temperatures with a high of 40F so far today. This is 11 degrees below the daily normal of 51F. Since midnight we have observed a low of 27F which is 7 degrees below the daily normal of 34F. Humidity was very low today which made for excellent visibility at 80 miles all day. PRELIMINARY STATS FOR MARCH 2018 TEMPERATURE, Deg. F Avg. Max. 41.2 [-3.1] Avg. Min. 27.9 [+1.3] Mean 34.6 [-0.9] 24-hour corrected mean: 33.9 Max. for month: 62F on 30th Min. for month: 10F on 18th HEATING DEGREE DAYS Total heating units: 941 [+25] Total for the season: 4063 [-421] Total for last season: 4902 PRECIPITATION, Inches Total: 8.68 [+3.29] Greatest in 24 hrs: 3.47 on the 2nd SNOWFALL, Inches Total: 45.5 [+32.8] Greatest in 24 hrs: 23.0 in. on 13th WIND, mph Avg. uncorrected wind speed: 13.9 Avg. corrected wind speed: 14.3 Prevailing wind direction: NW at 14% Peak gust and direction: 73 NNE on 2nd SUNSHINE: Campbell-Stokes card minutes: 8742 minutes of possible 21516 or 41% Astronomical total minutes: 9023 minutes of possible 22243 or 41% Blue Hill Observatory Greatest March Snowfall Totals, Inches (1885-2018) 1) 52.0 in 1956 2) 45.5 in 2018 3) 42.2 in 1916 4) 41.4 in 2001 5) 41.0 in 1967 6) 37.8 in 2013 7) 35.5 in 1993 BHO Greatest March Monthly Precipitation, inches (1885-2018): 1) 18.81 in 2010 2) 13.07 in 2001 3) 10.96 in 1968 4) 10.02 in 1983 5) 9.53 in 1953 6) 9.00 in 1984 7) 8.72 in 1993 8) 8.69 in 2018 9) 8.09 in 1956 10) 7.98 in 1994 Today's Observations: 7 A.M. Weather: Clear, few cumulus distant SSW-SW and NNW Temperature: 29F; Dew Point: 10F; Wind: WNW at 23G31 kts, Peak wind: 36 kts (41 MPH) at 6:12 A.M. Sea-level pressure: 29.88 ins. Hg, rising, then more slowly Visibility: 80 miles 6-hr Max temp: 34F 6-hr Min temp: 27F 24-hr precip: 0.21 ins. 24-hr snowfall: 0.0 ins. Snow depth: 0 ins. BHO SA 1155 CLR 80 117/29/10/2923G31/988/ FEW CU DSNT SSW-SW AND NNW PK WND 2936/12/ 8/100 51031 MANUAL 70021 ASOS 70028 10034 20027 10 A.M. Weather: Clear, few cumulus distant SE-W Temperature: 35F; Dew Point: 9F; Wind: WNW at 25G37 kts Peak wind: 37 kts (43 MPH) at 9:07 A.M. Sea-level pressure: 29.91 ins. Hg, rising, then more rapidly Visibility: 80 miles 3-hr precip: 0.00 ins. 3-hr snowfall: 0.0 ins. BHO SA 1455 CLR 80 129/35/09/2925G37/991/ FEW CU DSNT SE-W PK WND 2937/07/ 8/100 53012 1 P.M. Weather: Scattered cumulus Temperature: 40F; Dew Point: 7F; Wind: W at 19G37 kts, Peak Wind: 37 kts (43 mph) S at 12:49 P.M. Sea-level pressure: 29.92 ins. Hg, falling steadily Visibility: 80 miles 6-hr Max temp: 40F 6-hr Min temp: 28F 6-hr precip: 0.00 ins. 6-hr snowfall: 0.0 ins. Snow depth: 0 ins. BHO SA 1755 E54 SCT 80 131/40/07/2619G37/992/ PK WND 2637/49/ 8/100 53002 10040 20028 SUMMARY FOR WEDNESDAY, APRIL 4, 2018 TEMPERATURE (DEGREES F) MAX.....54 NORMAL.....51 MIN.....36 NORMAL.....33 MEAN....45 NORMAL.....42 DEPARTURE FROM 30-YEAR NORMAL...........................+3 TOTAL DEPARTURE FOR THE MONTH...........................-2 [-0.7 DEGREES/DAY] HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY.............20 DEPARTURE..........-3 TOTAL HEATING UNITS FOR THE MONTH.............96 DEPARTURE..........+2 TOTAL HEATING UNITS FOR THE SEASON..........5159 DEPARTURE........-419 TOTAL HEATING UNITS LAST SEASON TO DATE.....5000 DIFFERENCE.......+159 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY...................56 WNW AT 9:09 P.M. AERO........................56 WNW AT 9:09 P.M. ASOS........................55 W AT 9:09 P.M. DAVIS.......................49 M AT 11:57 P.M ** RMY 54 FASTEST MILE FOR YESTERDAY.....................37 WNW AT 9:09 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE..................37 W AT 9:10 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.................34 M AT 11:58 P.M.** AVERAGE WIND SPEED AND DIRECTION.............16.1 WNW ASOS......................16.1 DAVIS.....................14.3 M ** Davis direction malfunctioning PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.21 DEPARTURE......+0.04 ASOS..............0.28 TOTAL PRECIPITATION FOR THE MONTH..........0.88 DEPARTURE......+0.20 ASOS..............0.83 TOTAL PRECIPITATION FOR THE YEAR..........19.68 DEPARTURE......+5.18 ASOS.............21.07 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE........-0.2 TOTAL SNOWFALL FOR THE MONTH................1.6 DEPARTURE........+0.8 TOTAL SNOWFALL FOR THE SEASON..............91.8 DEPARTURE.......+31.2 PRELIMINARY CLIMATE SUMMARY FOR MARCH 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 3/01 61/37/49/+18/0.00/0.0/378/56 39 ENE AERO 37 ENE RMY N/A 3/02 40/32/36/+5/3.47/0.7/000/00 73 NNE AERO 70 NNE RMY N/A 3/03 40/32/26/+4/T/T/034/05 52 NNE AERO 50 NNE RMY 49 3/04 39/34/37/+5/T/T/000/00 36 NNE AERO 32 NNE RMY 32 3/05 40/29/35/+3/0.12/1.2/261/38 40 NE AERO 39 NE RMY 40 3/06 34/29/32/0/0.00/0.0/062/09 20 N AERO 16 N RMY N/A 3/07 35/31/33/0/1.49/10.0/000/00 52 ENE AERO 53 ENE RMY 50 3/08 34/28/31/-2/0.67/5.0/000/00 44 NNE AERO 47 NNE RMY N/A 3/09 36/24/30/-3/T/T/265/38 28 W AERO 26 W RMY N/A 3/10 37/28/33/0/0.00/0.0/343/49 38 WNW AERO 38 WNW RMY 41 3/11 42/26/34/0/0.00/0.0/583/83 28 NW AERO 26 NW RMY 29 3/12 39/26/33/-1/T/T/155/22 36 ENE AERO 33 ENE RMY N/A 3/13 35/26/31/-3/2.20/23.0/000/00 60 N AERO 60 N RMY 64 3/14 36/24/30/-5/0.00/0.0/470/66 38 WSW AERO 38 WSW RMY 41 3/15 40/29/35/0/0.01/0.2/422/59 44 W AERO 44 W RMY 44 3/16 35/23/29/-6/0.00/0.0/308/43 41 NW AERO 41 NW RMY 45 3/17 40/15/28/-8/0.00/0.0/533/74 46 W AERO 45 W RMY 49 3/18 31/10/21/-15/0.00/0.0/694/96 39 NW AERO 38 NW RMY 40 3/19 35/13/24/-12/0.00/0.0/704/97 32 WNW AERO 32 WNW RMY 34 3/20 40/18/29/-8/0.00/0.0/372/51 23 NW AERO 21 NW RMY N/A 3/21 35/31/33/-4/0.04/0.2/000/00 43 NE AERO 44 NE RMY N/A 3/22 39/30/35/-2/0.41/3.4/000/00 28 NNW AERO 26 NNW RMY 30 3/23 44/28/36/-2/0.00/0.0/539/73 21 NNW AERO 18 NNW RMY 21 3/24 45/32/39/+1/T/T/185/25 23 NE AERO 21 NE RMY N/A 3/25 36/29/33/-5/0.18/1.8/134/18 35 NNE AERO 30 NNE RMY 33 3/26 38/27/33/-6/0.00/0.0/701/94 33 NE AERO 26 NE RMY 30 3/27 44/25/35/-4/0.00/0.0/592/79 24 NE AERO 17 NE RMY 20 3/28 55/33/44/+5/0.01/0.0/293/39 21 SSW AERO 14 SSW RMY 18 3/29 55/39/47/+7/T/0.0/242/32 24 SSE AERO 21 SSE RMY N/A 3/30 62/42/52/+12/0.08/0.0/000/00 32 NW AERO 30 NW RMY N/A 3/31 56/35/46/+5/T/0.0/731/96 37 NW AERO 36 NW RMY N/A DAILY RECORDS FOR MARCH 2018 3/02/18: NEW DAILY RECORD MAXIMUM PRECIPITATION OF 3.47 INS. PREVIOUS RECORD WAS 2.15 INS. SET IN 1983 3/13/18: NEW DAILY RECORD MAXIMUM SNOWFALL OF 23.0 INS. PREVIOUS RECORD WAS 10.0 INS. SET IN 1993 3/13/18: NEW MONTHLY RECORD MAXIMUM DAILY SNOWFALL OF 23.0 INS. PREVIOUS RECORD WAS 18.0 INS. SET ON 8 MARCH 2013 PRELIMINARY CLIMATE SUMMARY FOR APRIL 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 4/01 58/33/46/+5/..../0.0/.../.. 45 SSW AERO 43 SSW RMY N/A 4/02 38/30/34/-7/..../1.6/.../.. 20 SSW AERO 15 SSW RMY 17 4/03 48/30/39/-3/..../0.0/.../.. 28 SSE AERO 25 SSE RMY 25 4/04 54/36/45/+3/..../0.0/.../.. 56 WNW AERO 56 WNW RMY 54 4/05 Low temp since midnight is 27F; normal low is now 33F DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 5 HIGH 81 IN 1928 LOW 15 IN 1995 PRECIP 2.15 IN. IN 1987 SNOWFALL 4.0 IN. IN 1898 PEAK GUST 76 MPH WNW IN 1963 RECORDS FOR APRIL 6 HIGH 82 IN 1921 LOW 16 IN 1982 PRE 1.72 INS IN 1886 SNOW 12.3 INS IN 1982 WIND 71e MPH WNW IN 1940 TODAY'S REPORT PREPARED BY: K.A. Geagan