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Saturday, May 24, 2025

May 24, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, MAY 24, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, MAY 24, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0415E SUNSET:  1908E SPOTTY SHOWERS AS LOW PRESSURE SYSTEM MOVES OUT OF THE AREA…. As if 3.74″ of rain wasn’t enough, we accumulated an additional 0.11″ inches yesterday evening. We are now holding the #9 spot for the wettest May on record. Below are the years with the highest May precipitation, as compiled by our chief scientist, Mike Iacono. BHO Highest May Precipitation, inches (1885-2025): 1) 10.10 in 2006 2) 9.16 in 1954 3) 9.14 in 1984 4) 8.65 in 2005 5) 8.18 in 1998 6) 7.91 in 1967 7) 7.81 in 1990 8) 7.55 in 1920 9) 7.22 in 2025 (through 1 PM 5/24) 10) 6.80 in 2002 We have remained mostly cloudy today, with a few breaks in the overcast conditions. Showers have been scattered and light. As of 1pm today we have received 0.02 inches of rain. Temperatures were holding steady in the low to mid 50’s for much of the day. Dew points were also higher, mostly due to the pop-up brief rain showers that were occurring in the area. We are still trending with below average temperatures but are seeing (and feeling) a gradual increase. The wind has predominantly been out of the West today and much less intense than yesterday. The average speed for the day so far is around 11mph. The peak gust so far for the day is 23mph, which occurred during the overnight hours around 3:34am. Visibility has struggled today, with the occasional rain showers and higher dew point values. We were around 40 miles this morning and had about 20 miles through the early afternoon hours. The maximum temperature for today is 60F degrees, which is 9 degrees below the normal high of 69F. The minimum temperature since midnight is 46F degrees, which is 5 degrees below the normal low of 51F. ————————————————————– Today’s Observations: 7 A.M. Weather: Thinly broken cirrus, few stratocumulus N-ENE and ESE-S-WSW, few altocumulus distant E-S-W-NW Temperature: 50F; Dew Point: 48F; Relative Humidity: 92% Wind: W @ 9 kts Sea-level pressure: 1010.9 mb; 29.85 in. Hg: rising, then more slowly Visibility: 40 miles 6-hr Max temp: 50F 6-hr Min temp: 46F 24-hr Precip:  0.11 inches 24-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1155 E250 -BKN 40 109/50/48/2709/985 FEW SC N-ENE AND ESE-S-WSW FEW AC DSNT E-S-W-NW/ 8/551 70011 10050 20046 10 A.M. Weather: Light rain, overcast stratocumulus, few breaks in overcast NW and NE, virga ENE-ESE, precipitation very light Temperature: 53F; Dew Point: 49F; Relative Humidity: 94% Wind: W @ 8 kts Sea-level pressure: 1010.5 mb; 29.84 in. Hg: rising, then falling Visibility: 20 miles, thin fog all quadrants 3-hr Precip:  0.01 inches 3-hr Snowfall: 0.0 inches BHO SA 1455 E30 OVC 20RW- 105/53/49/2608/984/ FEW BINOVC NW AND NE VIRGA ENE-ESE THN F ALQDS PCPN VRY LGT/ 8/5// 6001/ 58004 1 P.M. Weather: Overcast stratocumulus, few breaks in overcast all quadrants, few lower stratus fractus NE-ENE, virga NE and W-WNW, sun dimly visible Temperature: 58F Dew Point: 50F; Relative Humidity: 74% Wind: WSW @ 8 kts Sea-level pressure: 1010.2 mb; 29.83 in. Hg: falling, then steady Visibility: 30 miles 6-hr Max temp: 55F 6-hr Min temp: 42F 6-hr Precip:  0.00 inches 6-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1755 E30 OVC 30 102/58/50/2508/983/ FEW BINOVC ALQDS FEW LWR STFRA NE-ENE VIRGA NE AND W-WNW SUN DMLY VSBL/ 8/5// 56003 6002/ 10060 20050 ————————————————————– SUMMARY FOR FRIDAY, MAY 23, 2025 TEMPERATURE (DEGREES F) MAX…….56   NORMAL…..69 MIN…….41   NORMAL…..50 MEAN……49   NORMAL…..59 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………-10 TOTAL DEPARTURE FOR THE MONTH………………………+34 [+1.3 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025) TOTAL HEATING UNITS FOR YESTERDAY…………….16  DEPARTURE……..+9 TOTAL HEATING UNITS FOR THE MONTH……………173  DEPARTURE…….-38 TOTAL HEATING UNITS FOR THE SEASON………….5571  DEPARTURE……-527 TOTAL HEATING UNITS LAST SEASON TO DATE……..5365  DEPARTURE……+206 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-1 TOTAL COOLING UNITS FOR THE MONTH…………….11  DEPARTURE……..-3 TOTAL COOLING UNITS FOR THE SEASON……………14  DEPARTURE……..-3 TOTAL COOLING UNITS LAST SEASON TO DATE……….14  DEPARTURE………0 PEAK WIND GUST (MPH): Note: Instruments designated #1 = Main Tower, #2 = South Tower, F420C, Contacting, Merlin, and Richards are all on Main Tower. E=Estimated F420C (Official)………..41 N    @   01:09 A.M. VECTOR #1 (1-Sec)……….41 N    @   01:09 A.M. VECTOR #2 (1-Sec)……….42 N    @   01:09 A.M. DAVIS #1……………….36 NNE  @   01:09 A.M. DAVIS #2 ………………38 NE   @   01:09 A.M. RMY #1 (Instantaneous)…..42 N    @   01:31 A.M. RMY #2 (Instantaneous)…..43 N    @   01:47 A.M. MERLIN…………………M RICHARDS (C5C) (Inst)…..OTS FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………25 N    @   01:09 A.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25      @   01:09 A.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..26      @   01:10 A.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 N    @   01:10 A.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 NNE  @   01:10 A.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 N    @   01:09 A.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 N    @   01:10 A.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL……..11.0 WSW [263 total miles] VECTOR #1………………11.0 VECTOR #2………………11.3 DAVIS #1……………….11.0 WNW DAVIS #2……………….11.0 NW RMY #1…………………10.7 WNW RMY #2…………………11.0 WNW RICHARDS (C5C)…………..OTS PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.11 DEPARTURE…..-0.02 TOTAL PRECIPITATION FOR THE MONTH…………..7.20 DEPARTURE…..+4.45 TOTAL PRECIPITATION FOR THE YEAR (2025)…….21.32 DEPARTURE…..-0.21 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0 TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE…….0.0 TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.9 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST PEAK GUST: F420C (Official) VEC1: Vector #1 1-second gust RMY:  R.M. Young #1 wind gust recording system (Instantaneous) TSTM: Thunderstorm day (thunder heard some time during day) ….: Data not yet available, records not finalized M:    Missing data 5/1   69/43/56/+3/0.00/0.0/744/88        28 S   VEC1 28 SSW RMY 28 5/2   79/47/63/+9/0.19/0.0/339/40        28 SE  VEC1 29 SE  RMY 25 TSTM 5/3   84/54/69/+15/0.15/0.0/561/66       43 SSW VEC1 42 SSW RMY 44 TSTM 5/4   77/50/64/+10/0.06/0.0/256/30       33 SW  VEC1 34 SW  RMY 32 5/5   50/46/48/-7/0.26/0.0/000/00        35 ENE VEC1 35 ENE RMY 36 5/6   61/48/55/0/0.57/0.0/000/00         26 S   VEC1 27 ENE RMY 27 5/7   72/54/63/+8/0.01/0.0/310/36        33 SSW VEC1 33 SW  RMY 35 5/8   74/51/63/+8/0.04/0.0/474/55        18 ESE VEC1 18 ESE RMY 18 5/9   51/46/49/-7/1.15/0.0/000/00        33 E   VEC1 34 ENE RMY 35 5/10  62/45/54/-2/0.29/0.0/121/14        36 NW  VEC1 37 NW  RMY 41 TSTM 5/11  70/49/60/+4/0.00/0.0/851/98        33 NW  VEC1 32 NW  RMY 34 5/12  73/46/60/+3/0.00/0.0/853/98        36 SW  VEC1 34 SW  RMY 36 5/13  70/51/61/+4/0.00/0.0/759/87        26 ESE VEC1 27 ESE RMY 26 5/14  73/48/61/+4/0.00/0.0/586/67        18 SSE VEC1 19 SSE RMY 17 5/15  72/58/65/+8/0.62/0.0/079/09        20 SSE VEC1 20 SSE RMY 19 TSTM 5/16  78/61/70/+12/0.00/0.0/404/46       23 SW  VEC1 23 SSW RMY 23 5/17  76/58/67/+9/T/0.0/264/30           30 S   VEC1 29 S   RMY 30 5/18  68/54/61/+3/T/0.0/512/58           39 W   VEC1 39 W   RMY 38 5/19  63/46/55/-3/0.00/0.0/371/42        41 NW  VEC1 42 NW  RMY 44 5/20  55/45/50/-9/T/0.0/000/00           29 NNW VEC1 29 NNW RMY 30 5/21  48/43/46/-13/0.01/0.0/009/01       28 E   VEC1 28 E   RMY 27 5/22  45/42/44/-15/3.24/0.0/000/00       46 NE  VEC1 46 NE  RMY 48 TSTM 5/23  56/41/49/-10/0.61/0.0/…/..       41 N   VEC1 41 N   RMY 42 5/24 The low since midnight is 46F, the daily normal low is 51F. ————————————————————– MAY DAILY RECORDS TO DATE 5/16 RECORD HIGH MINIMUM TEMPERATURE OF 61F; PREVIOUS RECORD WAS 60F SET IN 2014 ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR MAY 24 HIGH 92F IN 1964 LOW 35F IN 1956 PRECIP 2.13 INS IN 1951 PEAK GUST 54 MPH NNE IN 2005 RECORDS FOR MAY 25 HIGH 91F IN 2007 LOW 37F IN 1967 PRECIP 3.73 INS IN 1967 PEAK GUST 83 MPH NE IN 1967 (RECORD FOR MAY) TODAY’S REPORT PREPARED BY: Amanda Joly
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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

Ownership and Proprietary Rights

All observational records, compiled datasets, metadata, database structures, and related materials provided by the Blue Hill Observatory & Science Center are the exclusive property of the Blue Hill Observatory & Science Center. The Observatory has maintained continuous weather observations at the summit of Great Blue Hill since 1885, and the entirety of that record — its compilation, structure, curation, and organization — constitutes a proprietary database protected under applicable United States law, including copyright law and common law database protections.

All rights not expressly granted in this Policy are reserved by the Observatory. No access to or use of Observatory data shall be construed as a waiver of any rights or as a license to use data beyond the scope expressly stated herein.

§ 02

Governing Law and Jurisdiction

This Policy shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts, without regard to its conflict of law provisions. For interactions with international users, this Policy shall apply to the maximum extent permitted by applicable local law.

Any dispute arising from or related to this Policy shall be subject to the exclusive jurisdiction of the state and federal courts located in Norfolk County, Massachusetts. By accessing Observatory data, all users consent to personal jurisdiction in Massachusetts and waive any objection to the venue or inconvenience of such forum.

§ 03

Permitted Uses

Observatory data are made available for the following limited, non-commercial purposes only:

  • Personal study and analysis
  • Educational classroom use
  • Student projects
  • Non-commercial academic research
  • Publication of analyses, figures, models, or conclusions derived from the data, subject to the attribution requirements of Section 4

All other uses require prior written authorization from the Observatory.

§ 04

Attribution Requirement

Any use of Observatory data in any published, presented, or publicly distributed work must include the following verbatim acknowledgment:

“Data provided by the Blue Hill Observatory & Science Center, Milton, Massachusetts. Continuous weather observations since 1885.”

Failure to include proper attribution is a material violation of this Policy.

§ 05

Prohibited Uses

Unless explicitly authorized in writing, Users may not:

  • Resell, license, sublicense, or commercially exploit Observatory data in any form
  • Redistribute the dataset in whole or in part to any third party
  • Publish the dataset for download by third parties
  • Host, mirror, or archive the dataset on any external website, repository, or storage service
  • Upload the dataset to any public or institutional data repository
  • Provide the data through APIs, automated services, or subscription platforms
  • Incorporate the data into any commercial product, software, application, or service
  • Use the data for AI or machine learning systems intended for commercial use or external distribution
  • Use the data to create derivative datasets that enable reconstruction of the underlying observations
§ 06

Commercial Licensing

Organizations seeking to use Observatory data for commercial purposes must obtain a license prior to any such use. Licensing inquiries: data@bluehill.org.

§ 07

Automated Access

Automated scraping, bulk harvesting, or systematic downloading of Observatory data is strictly prohibited without prior written authorization.

§ 08

Enforcement and Remedies

Violation of this Policy may result in immediate revocation of data access, pursuit of legal remedies available under United States law, and referral to applicable authorities. The Observatory reserves all rights to seek injunctive relief, damages, and attorneys’ fees in connection with any unauthorized use of its data.

Part II — Privacy Policy
§ 09–10

Scope & Information Collected

This section governs the collection, use, storage, and disclosure of personal information from visitors to the Blue Hill Observatory website and users of its data services. The Observatory may collect contact information (name, email, organization) when voluntarily submitted, usage data including IP addresses and pages visited, and data download records.

§ 11–12

How We Use Information & Retention

Information is used solely for: responding to inquiries and licensing requests; monitoring and enforcing compliance with this Policy; improving website performance; and communicating Observatory news to opted-in users. The Observatory does not sell, rent, or share personal information with third parties for marketing purposes. Data access records may be retained indefinitely for compliance and enforcement purposes.

§ 13

International Users and Data Transfers

The Observatory is located in the United States. International users acknowledge their information will be processed in the United States under U.S. law. Users requiring specific data processing agreements under non-US law must contact data@bluehill.org before accessing data.

§ 14–16

Cookies, Security & Children’s Privacy

The Observatory website may use cookies for analytics and functionality. By continuing to use the site, users consent to cookie use. The Observatory implements reasonable measures to protect personal information but cannot guarantee absolute security. Observatory data services are not directed at children under 13.

Part III — General Provisions
§ 17–20

Modifications, Severability, Entire Agreement & Contact

The Observatory reserves the right to modify this Policy at any time. Updated versions will be posted at bluehill.org. Continued use of Observatory data following any modification constitutes acceptance of the revised Policy. This Policy constitutes the entire agreement between the User and the Observatory. Questions and licensing inquiries: Blue Hill Observatory & Science Center, Milton, Massachusetts — data@bluehill.org

By accessing, downloading, or using any Blue Hill Observatory data or services, you acknowledge that you have read, understood, and agree to be bound by this Policy.
Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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