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Wednesday, May 27, 2026

May 27, 2026

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, MAY 27, 2026 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA WEDNESDAY, MAY 27, 2026 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0413E SUNSET:  1910E CONTINUED WARM TEMPERATURES WITH INCREASING HIGH CLOUDS…. The weak area of high pressure that moved over the region yesterday has pushed well to the east today. A cold front is currently pushing through the region this afternoon with little activity associated with it, more or less just a wind shift. Today featured a mix of sun and clouds through the morning, but the clouds have thickened early this afternoon. As such the sun is now quite filtered and not shining enough to burn our sun card. Temperatures have again warmed into the low to mid 80s this afternoon, which is again more than 10 degrees above the normal. Dew point values have been creeping up today ahead of the cold front, with values rising from the mid 50s to the low 60s. So it does feel a bit humid out there this afternoon. Winds have been fairly steady through the day, generally out of the west-southwest. The average speed for the day so far is around 11mph. The peak gust for the day so far is 25mph, which occurred just before 1pm this afternoon. Visibility has been limited today due to increasing haziness. We started with a view of around 60 miles early this morning, but it lowered to around 40 miles by early this afternoon. The maximum temperature so far today is 84F degrees, which is 14 degrees above the normal high of 70F. The minimum temperature since midnight is 62F degrees, which is 11 degrees above the normal low of 51F. ————————————————————– Today’s Observations: 7 A.M. Weather: Thin broken cirrus, few cirrocumulus all quadrants Temperature: 68F; Dew Point: 57F; Relative Humidity: 68% Wind: W @ 9 kts Sea-level pressure: 1012.3 mb; 29.89 in. Hg: rising, then falling Visibility: 50 miles, hazy 6-hr Max temp: 68F 6-hr Min temp: 62F 24-hr Precip: 0.00 inches BHO SA 1155 E250 -OVC 50 123/68/57/2609/989/ FEW CC ALQDS HAZY/ 8/009 58002 10068 20062 10 A.M. Weather: Broken altocumulus/altostratus, broken cirrus Temperature: 81F; Dew Point: 60F; Relative Humidity: 49% Wind: W @ 7 kts Sea-level pressure: 1010.9 mb; 29.85 in. Hg: falling, then more rapidly Visibility: 50 miles, hazy 3-hr Precip: 0.00 inches BHO SA 1455 E160 BKN 250 BKN 50 109/81/60/2607/985/ HAZY/ 8/071 58014 1 P.M. Weather: Broken cirrus, few cumulus distant WSW-NNE Temperature: 81F; Dew Point: 61F; Relative Humidity: 50% Wind: WSW @ 9G17 kts Sea-level pressure: 1008.6 mb; 29.78 in. Hg: falling, then more slowly Visibility: 40 miles, hazy 6-hr Max temp: 84F 6-hr Min temp: 68F 6-hr Precip: 0.00 inches BHO SA 1755 E250 BKN 40 086/81/61/2509G17/978/ FEW CU DSNT WSW-NNE HAZY/ 8/204 56023 10084 20068 ————————————————————– SUMMARY FOR TUESDAY, MAY 26, 2026 TEMPERATURE (DEGREES F) MAX…….82   NORMAL…..69 MIN…….56   NORMAL…..51 MEAN……69   NORMAL…..60 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………….+9 TOTAL DEPARTURE FOR THE MONTH………………………+59 [+2.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2025 THRU JUN 2026) TOTAL HEATING UNITS FOR YESTERDAY……………..0  DEPARTURE……..-6 TOTAL HEATING UNITS FOR THE MONTH (MAY)………197  DEPARTURE…….-33 TOTAL HEATING UNITS FOR THE SEASON………….6033  DEPARTURE…….-84 TOTAL HEATING UNITS LAST SEASON TO DATE……..5595  DEPARTURE……+431 COOLING DEGREE DAYS (SEASON: JAN 2026 THRU DEC 2026) TOTAL COOLING UNITS FOR YESTERDAY……………..4  DEPARTURE……..+3 TOTAL COOLING UNITS FOR THE MONTH (MAY)……….45  DEPARTURE…….+28 TOTAL COOLING UNITS FOR THE SEASON……………51  DEPARTURE…….+31 TOTAL COOLING UNITS LAST SEASON TO DATE……….14  DEPARTURE…….+37 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 *=Last of multiple occurrences F420C (Official)………..28 SSW  @   06:17 P.M. VECTOR #1 (1-Sec)……….27 SW   @   06:52 P.M. VECTOR #2 (1-Sec)……….29 SW   @   06:54 P.M. DAVIS #1……………….27 S    @   04:21 P.M. DAVIS #2 ………………30 S    @   04:22 P.M. RMY #1 (Instantaneous)…..29 SW   @   06:52 P.M. RMY #2 (Instantaneous)…..29 SW   @   06:54 P.M. MERLIN…………………26 SSW RICHARDS (C5C) (Inst)……27 SW   @   06:54 P.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………20 SW   @   06:57 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 SW   @   06:56 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 SW   @   06:56 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 SW   @   06:56 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 S    @   04:23 P.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 SW   @   06:55 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 SW   @   06:56 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18 S    @   04:23 P.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL………9.5 WSW [228 total miles] VECTOR #1……………….9.9 VECTOR #2………………10.4 DAVIS #1………………..9.8 W DAVIS #2……………….10.3 W RMY #1………………….9.8 W RMY #2…………………10.3 W RICHARDS (C5C)…………..9.9 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14 TOTAL PRECIPITATION FOR THE MONTH (MAY)……..1.95 DEPARTURE…..-1.20 TOTAL PRECIPITATION FOR THE YEAR (2026)…….15.62 DEPARTURE…..-6.31 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……0.0 TOTAL SNOWFALL FOR THE MONTH (MAY)…………..0.0 DEPARTURE……0.0 TOTAL SNOWFALL FOR THE SEASON (2025-2026)……81.6 DEPARTURE….+11.9 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/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  63/43/53/0/0.00/769/91              26 WNW VEC1 27 NNW RMY 27 5/2  58/45/52/-2/0.04/127/15             29 SSW VEC1 29 SSW RMY 28 5/3  53/41/47/-7/T/119/14                37 NW  VEC1 36 NW  RMY 39 5/4  71/41/56/+2/0.00/775/91             46 SW  VEC1 46 SW  RMY 48 5/5  78/49/64/+9/0.00/718/84             43 SSW VEC1 43 SSW RMY 45 5/6  68/54/61/+6/0.08/146/17             43 SSW VEC1 42 SSW RMY 44 5/7  65/46/56/+1/0.22/697/81             28 WNW VEC1 27 WNW RMY 28 5/8  62/40/51/-4/0.00/741/86             33 W   VEC1 33 W   RMY 33 5/9  58/43/51/-5/0.35/000/00             30 SSW VEC1 31 SSW RMY 30 5/10 72/49/61/+5/T/346/40                28 SSW VEC1 28 SSW RMY 27 5/11 62/45/54/-2/T/191/22                26 NNW VEC1 26 NNW RMY 26 5/12 63/42/53/-4/T/835/96                29 WNW VEC1 29 WNW RMY 29 5/13 65/46/56/-1/T/122/14                41 S   VEC1 40 S   RMY 44 5/14 61/48/55/-2/0.26/000/00             37 SSE VEC1 38 SE  RMY 36 5/15 56/47/52/-5/0.04/026/03             18 NE  VEC1 19 NE  RMY 20 5/16 78/47/63/+5/0.00/853/97             33 SW  VEC1 34 SSW RMY 35 5/17 86/56/71/+13/0.05/827/94            39 W   VEC1 38 W   RMY 40 5/18 84/62/73/+15/0.00/829/94            33 SSW VEC1 32 SSW RMY 33 5/19 95/65/80/+22/0.25/716/81            47 NW  VEC1 47 NW  RMY 50 TSTM 5/20 89/65/77/+18/0.00/789/89            39 WNW VEC1 39 WNW RMY 41 5/21 68/52/60/+1/0.01/…/..             22 N   VEC1 22 N   RMY 22 5/22 61/47/54/-5/0.00/…/..             24 ENE VEC1 25 ENE RMY 24 5/23 62/49/56/-3/0.01/…/..             16 NE  VEC1 16 NE  RMY 16 5/24 52/48/50/-10/0.52/…/..            26 ESE VEC1 28 ESE RMY 27 5/25 74/52/63/+3/0.12/…/..             22 WNW VEC1 22 WNW RMY 22 5/26 82/56/69/+9/0.00/…/..             28 SSW VEC1 27 SW  RMY 29 5/27 The low since midnight is 62F, the daily normal low is 51F. ————————————————————– MAY DAILY RECORDS TO DATE 5/19 RECORD HIGH MAXIMUM TEMPERATURE OF 95F, BEATING THE PREVIOUS RECORD OF 91F SET IN 1962 ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR MAY 27 HIGH 92F IN 1914 LOW 36F IN 1915 PRECIP 1.40 INS IN 1898 PEAK GUST 55 S IN 1956 RECORDS FOR MAY 28 HIGH 92F IN 2016 LOW 39F IN 1917 PRECIP 2.48 INS 1906 PEAK GUST 51e MPH NE IN 1946 TODAY’S REPORT PREPARED BY: Matt Douglas
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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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