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Saturday, April 26, 2025

April 26, 2025

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, APRIL 26, 2025 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, APRIL 26, 2025 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0446E SUNSET:  1839E WINDY WITH PERIODS OF RAIN…. Rain began here mid morning, with the intensity being rather light. The storm total precipitation so far is 0.37″, which will certainly aid in reducing our rainfall deficit for the month. A lull in the rainfall began around 10:30am, lasting until 12:30pm. Temperatures have been stable, holding in the mid to upper 50s all day. Though it may feel chilly compared to our recent warm stretch, this is only slightly below climatology in terms of high temperature. Winds picked up last night, and have remained elevated over the past several hours. The average speed so far is 19mph, mostly out of the south-southwest. Gusts have frequented the 30-40mph range, with a peak gust of 41mph occurring 3 separate times. Visibility remains poor due to fog and low clouds. Views have ranged from 1/16 to 10 miles. The maximum temperature for today is 59F degrees, which is 2 degrees below the normal high of 61F. The minimum temperature since midnight is 56F degrees, which is 14 degrees above the normal low of 42F. ————————————————————– Today’s Observations: 7 A.M. Weather: Sky obscured, vertical visibility 200ft, light rain and fog Temperature: 57F; Dew Point: 57F; Relative Humidity: 100% Wind: S @ 16G30 kts, peak wind SSW 35mph @ 6:52am Sea-level pressure: 1013.6 mb; 29.93 in. Hg: falling, then more rapidly Visibility: 1/8 mile, fog 6-hr Max temp: 57F 6-hr Min temp: 56F 24-hr Precip:  0.05 inches 24-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1155 X W2 1/8R-F 136/57/57/1916G30/993/ PK WND 2030/52/ 8//// 58020 6005/ 70005 10057 20056 10 A.M. Weather: Sky obscured, vertical visibility 300ft, light rain and fog Temperature: 58F; Dew Point: 58F; Relative Humidity: 100% Wind: S @ 22G36 kts, peak wind SSW 41mph @ 9:47am Sea-level pressure: 1010.6 mb; 29.84 in. Hg: falling unsteadily Visibility: 2 miles, fog 3-hr Precip:  0.27 inches 3-hr Snowfall: 0.0 inches BHO SA 1455 X W3 2R-F 106/58/58/1922G36/984/ PK WND 2036/47/ 8//// 57030 6027/ 1 P.M. Weather: Sky obscured, vertical visibility 200ft, very light rain and fog Temperature: 58F Dew Point: 58F; Relative Humidity: 100% Wind: SSW @ 17G28 kts, peak wind SSW 39mph @ 11:56am Sea-level pressure: 1008.6 mb; 29.78 in. Hg: falling, then more slowly Visibility: 1/16 miles, fog 6-hr Max temp: 59F 6-hr Min temp: 57F 6-hr Precip:  0.32 inches 6-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1755 X W2 1/16R-F 086/58/58/2017G28/978/ PCPN VRY LGT PK WND 2034/56/ 8//// 56020 6032/ 10059 20057 ————————————————————– SUMMARY FOR FRIDAY, APRIL 25, 2025 TEMPERATURE (DEGREES F) MAX…….78   NORMAL…..61 MIN…….52   NORMAL…..42 MEAN……65   NORMAL…..51 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……………+14 TOTAL DEPARTURE FOR THE MONTH………………………+41 [+1.4 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025) TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE…….-14 TOTAL HEATING UNITS FOR THE MONTH……………433  DEPARTURE…….-42 TOTAL HEATING UNITS FOR THE SEASON………….5362  DEPARTURE……-460 TOTAL HEATING UNITS LAST SEASON TO DATE……..5096  DEPARTURE……+266 COOLING DEGREE DAYS (SEASON JAN 2025 THRU DEC 2025) TOTAL COOLING UNITS FOR YESTERDAY……………..0  DEPARTURE………0 TOTAL COOLING UNITS FOR THE MONTH……………..2  DEPARTURE………0 TOTAL COOLING UNITS FOR THE SEASON…………….2  DEPARTURE………0 TOTAL COOLING UNITS LAST SEASON TO DATE………..0  DEPARTURE……..+2 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)………..30 SSW  @   08:59 P.M. VECTOR #1 (1-Sec)……….30 SSW  @   09:17 P.M. VECTOR #2 (1-Sec)……….31 SSW  @   09:17 P.M. DAVIS #1……………….30 S    @   08:32 P.M. DAVIS #2 ………………31 S    @   08:37 P.M. RMY #1 (Instantaneous)…..30 SSW  @   09:17 P.M. RMY #2 (Instantaneous)…..32 SSW  @   09:17 P.M. MERLIN………………….M RICHARDS (C5C) (Inst)…..OTS FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………21 SSW  @   09:00 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21      @   08:59 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22      @   08:59 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 S    @   08:46 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 S    @   08:37 P.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 SSW  @   08:59 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 SSW  @   08:59 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL……..10.3 SSW [248 total miles] VECTOR #1………………10.6 VECTOR #2………………10.9 DAVIS #1……………….10.6 SSW DAVIS #2……………….11.0 SSW RMY #1…………………10.4 SSW RMY #2…………………11.0 SSW RICHARDS (C5C)…………..OTS PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.05 DEPARTURE…..-0.09 TOTAL PRECIPITATION FOR THE MONTH…………..2.93 DEPARTURE…..-1.11 TOTAL PRECIPITATION FOR THE YEAR (2025)…….13.64 DEPARTURE…..-4.42 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0 TOTAL SNOWFALL FOR THE MONTH………………..1.7 DEPARTURE……-1.0 TOTAL SNOWFALL FOR THE SEASON (2024-2025)……35.8 DEPARTURE…..-33.8 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR APRIL 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 4/1    55/32/44/+3/0.17/0.0/512/67       38 NW  VEC1 38 NW  RMY 40 4/2    42/27/35/-6/0.11/T/584/76         29 NNW VEC1 28 NNW RMY 29 4/3    62/32/47/+5/0.31/0.0/000/00       38 SW  VEC1 38 SW  RMY 39 4/4    69/47/58/+16/0.00/0.0/456/59      31 NW  VEC1 31 NW  RMY 30 4/5    47/36/42/-1/0.49/0.0/000/00       25 ESE VEC1 29 SE  RMY 25 4/6    51/37/44/+1/0.20/0.0/016/02       22 NNW VEC1 21 NNW RMY 21 4/7    45/34/40/-4/0.18/T/000/00         24 E   VEC1 23 NNE RMY 23 4/8    40/26/33/-11/0.10/0.1/196/25      51 W   VEC1 48 W   RMY 51 4/9    46/24/35/-9/0.00/0.0/755/96       36 WNW VEC1 33 NW  RMY 36 4/10   49/29/39/-6/0.01/0.0/569/72       23 SSW VEC1 23 SSW RMY 25 4/11   45/31/38/-7/0.39/1.2/024/03       25 ENE VEC1 27 ENE RMY 26 4/12   36/33/35/-11/0.46/0.4/000/00      39 ENE VEC1 40 E   RMY 42 4/13   42/35/39/-7/0.16/0.0/000/00       38 NE  VEC1 38 NE  RMY 40 4/14   67/35/51/+4/0.00/0.0/745/93       29 WNW VEC1 29 NNW RMY 28 4/15   66/44/55/+8/0.04/0.0/209/26       53 NW  VEC1 51 NW  RMY 54 TSTM 4/16   51/37/44/-3/T/0.0/484/60          44 WNW VEC1 43 WNW RMY 47 4/17   59/35/47/-1/0.00/0.0/800/99       35 WNW VEC1 34 WNW RMY 34 4/18   66/38/54/+4/0.00/0.0/617/76       41 SSW VEC1 42 SSW RMY 43 4/19   82/52/67/+18/T/0.0/383/47         40 WNW VEC1 40 W   RMY 40 4/20   67/45/56/+7/0.00/0.0/768/94       53 NW  VEC1 54 NW  RMY 56 4/21   63/37/50/0/0.00/0.0/566/69        30 SSW VEC1 28 SSW RMY 31 4/22   75/44/60/+10/0.26/0.0/452/55      30 SSW VEC1 30 SSW RMY 30 4/23   72/43/58/+8/0.00/0.0/792/96       24 NW  VEC1 23 NW  RMY 26 4/24   74/45/60/+9/0.00/0.0/…/..       31 S   VEC1 31 S   RMY 30 4/25   78/52/65/+14/T/0.0/…/..         30 SSW VEC1 30 SSW RMY 30 4/26 The low since midnight is 56F, the daily normal low is 42F. ————————————————————– APRIL DAILY RECORDS TO DATE NONE. ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR APRIL 26 HIGH 88 IN 2009 LOW 23 IN 1919 PRECIP 1.64 IN. IN 1931 SNOWFALL 1.0 IN. IN 2000 PEAK GUST 53 MPH SSW IN 1996 RECORDS FOR APRIL 27 HIGH 93 IN 1990 LOW 28 IN 1919 PRECIP 1.89 IN 1979 SNOWFALL 2.7 IN. IN 1993 PEAK GUST 65e MPH N IN 1941 TODAY’S REPORT PREPARED BY: Joshua Polen
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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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