BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA   DAILY DISCUSSION AND CLIMATE SUMMARY MONDAY, MARCH 24, 2014 ALL TIMES ARE IN EASTERN STANDARD TIME   FULL FORCE OF ARCTIC AIR MASS ARRIVES IN EARLY HOURS NNW WINDS GUST TO 37 MPH AT 1:41 A.M. EDT THIS MORNING TEMPERATURES FALL THROUGH TEENS TO 13F BY 6-7 A.M. EDT DEW POINTS FALL THROUGH SINGLE NUMBER BELOW ZERO   A strong push of Arctic air arrived during the early morning hours of today with a gusty NNW wind to 37 MPH, temperatures falling through the teens and dew points going from single numbers above zero last evening to single numbers below zero this morning.   The low of 13F this morning was well above the record low of 6 above zero set this date in 1906.  The record low maximum for this date of 22F was established way back in 1888.   Strong sunshine today has boosted our temperature to the upper 20's by early afternoon with a relative humidity at a low at 27%.   Today's Observations:   7 A.M. Weather: Clear, cumulus/stratocumulus distant NE-SE offshore Temperature: 15F; Dew Point: -3F; Wind: NW at 15 kts, Wind: Direction variability WNW-N Sea-level pressure: 30.15 ins. Hg, rising then more slowly Visibility: 60 miles, 70 miles NW, light distant haze 6-hr max temp: 17F 6-hr min temp: 13F Snow depth: Trace  BHO SA 1155 CLR 60 209/15/-3/3215/015/ CU/SC DSNT NE-SE OFFSHR VSBY NW 70 LGT DSNT HZ GST 22 LTS PST HR WND 30V01/ 8/800 51013 10017 20013   10 A.M.  Weather: Clear, cumulus/stratocumulus distant offshore NE-SE  Temperature: 23F; Dew Point: -4F; Wind: NW at 9 kts, Wind: Direction variability W to N Sea-level pressure: 30.14 ins. Hg, falling slightly Visibility: 60 miles, BW 70, light distant haze   BHO SA 1455 CLR 60 205/23/-4/3209/014/ CU/SC DSNT OFFSHR NE-SE VSBY NW 70 LGT DSNT HZ WND 28V01/ 8/800 58004   1 P.M. Weather: Clear, few cumulus, stratocumulus offshore distant ENE-ESE Wind: Direction variable WSW-NNW Sea-level pressure: 30.08 ins. Hg, falling then more rapidly Visibility: 60 miles, except 70 miles NW, light distant haze 6-hr max temp: 30F  6-hr min temp: 15F BHO SA 1755 CLR 60 185/29/-1/2812/008/ FEW CU/SC DSNT ENE-ESE OFFSHR VSBY NW 70 LGT DSNT HZ WND GST 25 KTS PST HR WND 25V33/ 8/800 58020 10030 20015   WEATHER SUMMARY FOR SUNDAY, MARCH 23, 2014   TEMPERATURE (DEGREES F) MAX.....43    NORMAL.....46 MIN.....20    NORMAL.....29 MEAN....32    NORMAL.....38   DEPARTURE FROM 30-YEAR NORMAL.........................-6 TOTAL DEPARTURE FOR THE MONTH........................-77 [-3.5 DEGREES/DAY]   HEATING DEGREE DAYS (SEASON JUL TO JUN) TOTAL HEATING UNITS FOR YESTERDAY..............33  DEPARTURE..........+6 TOTAL HEATING UNITS FOR THE MONTH.............786  DEPARTURE.........+76      TOTAL HEATING UNITS FOR THE SEASON...........5377  DEPARTURE........+100  TOTAL HEATING UNITS LAST SEASON TO DATE......4835  DIFFERENCE.......+542   PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..................32 NNW  AT 11:14 P.M.                                    AERO.......................32 NNW  AT 11:14 P.M.                                              ASOS.......................32 NNW  AT 11:14 P.M.                                          DAVIS......................N/A RMY N/A    FASTEST MILE FOR YESTERDAY....................21 N    AT 11:14 P.M.             MAXIMUM 2-MINUTE ASOS AVERAGE.................22 N    AT 11:15 P.M.         MAXIMUM 2-MINUTE DAVIS AVERAGE................N/A                      AVERAGE WIND SPEED AND DIRECTION............11.8 NNW                      ASOS.....................11.9                         DAVIS....................10.1 WNW [290 deg.]   PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00  DEPARTURE.............-0.20                          ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.00  DEPARTURE.............-3.11                                ASOS..............1.01 TOTAL PRECIPITATION FOR THE YEAR..........11.09  DEPARTURE.............-1.44                           ASOS.............11.55   SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE..............-0.4 TOTAL SNOWFALL FOR THE MONTH................2.5  DEPARTURE..............-7.9 TOTAL SNOWFALL FOR THE SEASON..............84.3  DEPARTURE.............+26.9   PRELIMINARY CLIMATE SUMMARY FOR MARCH 2014 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO 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   3/1  34/12/23/-8/0.00/0.0/458/68          28 SSW AERO 29 MPH SSW RMY 30 3/2  37/28/33/2/T/T/014/02                22 SW  AERO 22 MPH SW  RMY 29 3/3  28/11/20/-12/0.00/0.0/000/00         29 NNW AERO 30 MPH NNW RMY N/A 3/4  29/6/18/-14/0.00/0.0/444/65          17 SW  AERO 16 MPH SW  RMY 17 3/5  27/16/22/-10/0.02/0.3/000/00         21 NE  AERO 20 MPH N   RMY 23 3/6  26/7/17/-15/0.00/0.0/689/100         23 NNW AERO 23 MPH NNW RMY N/A  3/7  35/16/26/-7/0.00/0.0/449/65          18 SE  AERO 17 MPH SE  RMY 18  3/8  52/27/40/+7/0.00/0.0/673/97          26 NW  AERO 29 MPH NNW RMY 27 3/9  40/25/33/0/0.00/0.0/669/96           28 NW  AERO 29 MPH NW  RMY 29 3/10 42/26/34/+1/0.03/0.8/196/28          21 S   AERO 22 MPH S   RMY 27 3/11 56/34/45/+11/0.00/0.0/450/64         33 W   AERO 33 MPH W   RMY 34  3/12 53/34/44/+10/0.50/T/120/17           29 NNW AERO 30 MPH NNW RMY 30 3/13 33/12/23/-11/0.14/1.4/007/01         43 NW  AERO 45 MPH NW  RMY 45 3/14 37/10/24/-11/0.00/0.0/498/70         39 SSW AERO 41 MPH SSW RMY 42 3/15 54/35/45/+10/0.01/0.0/450/63         50 WNW AERO 58 MPH WNW RMY 54 3/16 34/21/28/-7/0.00/0.0/509/71          36 W   AERO 36 MPH WNW RMY 37 3/17 30/13/22/-14/0.00/0.0/562/78         25 N   AERO 26 MPH N   RMY 19 3/18 35/16/26/-10/0.00/0.0/701/97         18 ENE AERO 16 MPH ENE RMY 18 3/19 44/23/34/-2/T/0.0/.../..             24 E   AERO 23 MPH E   RMY 26 3/20 51/35/43/+6/0.30/0.0/.../..          36 W   AERO 37 MPH W   RMY 39 3/21 42/29/36/-1/0.00/0.0/.../..          40 W   AERO 41 MPH W   RMY 42 3/22 55/26/41/+4/T/0.0/.../..             52 WNW AERO 52 MPH WNW RMY 53 3/23 43/20/32/-6/0.00/0.0/.../..          32 NNW AERO 32 MPH NNW RMY N/A   3/24 morning low temp: 13F; the normal low is now 29F   DAILY RECORDS FOR MARCH 2014 None so far.   DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated):   RECORDS FOR MARCH 24 HIGH 70 IN 1920 LOW 6 IN 1906 PRECIP 1.51 INS. IN 1956 SNOWFALL 12.3 INS. IN 1956 PEAK GUST 71 MPH W IN 1968   RECORDS FOR MARCH 25 HIGH 76 IN 1910 LOW 8 IN 1888, 1956 PRECIP 1.84 INS. IN 1909 SNOWFALL 1.0 INS. IN 1912 PEAK GUST 69 MPH SE IN 1969 TODAY'S REPORT PREPARED BY: Robert Skilling