BLUES

Thundering Clouds

#66778D

RGB 102, 119, 141 · HSL 214°, 16%, 48% · CMYK 28, 16, 0, 45

Thundering Clouds is #66778D in HEX — rgb(102, 119, 141), hsl(214°, 16%, 48%), cmyk(28%, 16%, 0%, 45%).

Thundering Clouds pulls into the mid-tone end of the blues spectrum — HSL 214°, 16%, 48%. The neutral saturation makes it near-neutral and forgiving, and the hue reads cool. In interior projects it shines on bedrooms, bathrooms, home offices — for calm, focused environments. Reads best alongside warm white trim, oak or walnut, brass or matte black hardware.

Color Codes

HEX#66778D

RGB102, 119, 141

HSL214°, 16%, 48%

HSV214°, 28%, 55%

CMYK28, 16, 0, 45

Decimal6715277

CSS RGBrgb(102, 119, 141)

CSS HSLhsl(214, 16%, 48%)

Paint Matches — this color across 16 brands

Valspar

Thundering Clouds 4005-4B

Exact match

Dulux

Niche S40C5

ΔE 1.2 · #65768E

PPG

Blue Cloud 1164-6

ΔE 2.4 · #627188

Hallman-Lindsay

Blue Depths 626

ΔE 3.5 · #5A7187

Behr

Blue Aura PPU16-17

ΔE 3.7 · #6C7387

Vista Paint

Blue Depths C-625

ΔE 3.9 · #596F85

Sherwin-Williams

Searching Blue SW6536

ΔE 4.2 · #6C7F9A

Benjamin Moore

In 1434 · CC-934

ΔE 4.4 · #757E93

Kilz

North Beach Blue RC140-01

ΔE 4.7 · #70839A

Dunn-Edwards

Lakeville DE5872

ΔE 5.2 · #6C849B

IKEA

IKEA154 154

ΔE 6 · #667480

RAL

Pigeon Blue 5014

ΔE 6 · #606E8C

Farrow & Ball

Pitch Blue 220

ΔE 7.8 · #636E8F

Dutch Boy

Ocean Blue D-6743

ΔE 10.9 · #4C6A74

Kobra

Grey 42

ΔE 13 · #889099

Colorhouse

Wool .06 Wool-06

ΔE 14.9 · #485761

Light Reflectance & Undertone

Light Reflectance Value (LRV)

18/100

Dark

0 · DarkLight · 100

Soaks up light and feels moody and intimate. Great for studies, dining rooms and accent walls; pair with ample lighting.

Undertone

TemperatureCool MasstoneBlue UndertoneViolet

Reads as a cool blue with a violet undertone showing through, especially in daylight. Pair trim and adjacent colours to either calm or amplify that undertone.

Color Theory

Complementary

#66778D

#8E7D67

Analogous

#678B8E

#66778D

#69678E

Triadic

#66778D

#8E6778

#788E67

Split-Complementary

#66778D

#8E6967

#8B8E67

Tetradic

#66778D

#8E678B

#8E7D67

#678E69

Monochromatic

#272D35

#475262

#66778D

#929FB0

#BEC6D0

Rectangle

#66778D

#7D678E

#8E7D67

#788E67

Compound

#66778D

#69678E

#8E7D67

#8B8E67

Variations

Lighter

#8493A6

#A5AEBA

#CBD0D6

Darker

#516072

#37424F

#20262E

Saturation

#757A80

#67788E

#3371C1

Interior Use

Best Rooms

bedrooms, bathrooms, home offices

Best Uses

main walls, ceilings, trim, cabinetry

Pairs With

warm white trim, oak or walnut, brass or matte black hardware

Accessibility (WCAG)

vs White

4.58:1

vs Black

4.59:1

Deuteranopia

#66778D

#6C748E

Original → Simulated

Protanopia

#66778D

#74748A

Original → Simulated

Tritanopia

#66778D

#647B78

Original → Simulated

Color Psychology

Focused · Cooling

Thundering Clouds lowers the temperature of a room — useful in south-facing rooms that overheat visually, and in home offices where you want a clear head. Pair with warm wood and brass to keep it from reading clinical.

SymbolismTrust, depth, stability

PersonalityClear-headed, dependable, contemplative

focustrustcalmofficebedroomdepth

How it looks under different light

#8C8685

Warm Bulb 2700K

Incandescent / soft white LED — pulls colour toward yellow/amber.

#66778D

Daylight 5500K

Midday natural light or daylight-spec LED — closest to the paint chip.

#798BA9

Cool Bulb 6500K

Cool white LED / overcast daylight — pulls colour toward blue.

Pairs With

#EAEBEB

Trim

Matched off-white

Same hue at 92% lightness — trim reads coordinated, not stark.

#F7F7F7

Ceiling

Whisper tint

Near-white with a hint of the hero's undertone — ceiling feels intentional.

#826C4E

Accent

Complementary punch

Hue +180°, slightly muted for paint vs. screen — use on a door, frame, or single piece.

#574738

Floor

Walnut neutral

Warm mid-brown grounds the scheme regardless of hero hue.

Paint Info

Brand · Product Line

Benjamin Moore / Regal Select Interior

Recommended Finishes

Eggshell (walls) · Pearl (trim) · Matte (ceiling)

Eggshell hides imperfections on main walls while keeping the color rich; pearl on trim adds subtle sheen and easier cleaning; flat matte on ceilings prevents glare.

Best Surfaces

Primary walls · Cabinetry · Doors · Mouldings

Coverage & Dry Time

Typical coverage 350-400 sq ft per gallon over a primed surface.

Touch-dry in ~1 hour. Recoat after 4 hours. Full cure 7-14 days.

Primer

Standard primer is adequate.

Application Tip

Use a 9" microfiber roller on walls and a 2.5" angled sash brush for trim cuts. Two coats minimum for even depth.

Paint Calculator

Wall area (m²)

Coats

Coverage (m² / L)

You'll need

4.0 litres

1.06 US gallons · room for one touch-up coat. Buy slightly more to ensure single-batch match.

Code Snippets

CSS — color

color: #66778D;

CSS — background

background-color: #66778D;

CSS Variable

--color-thundering-clouds: #66778D;

Tailwind v3 — config

colors: { 'thundering-clouds': '#66778D' }

Tailwind — arbitrary

bg-[#66778D] text-[#66778D]

SCSS

$thundering-clouds: #66778D;

Similar Colors

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#747D92 · ΔE 4.1

Amethyst Shadow

#6E7182 · ΔE 5.8

Philipsburg Blue

#627885 · ΔE 5.8

French Violet

#696D86 · ΔE 5.9

Blue Heron

#5C6A85 · ΔE 6.0

Georgian Bay

#537284 · ΔE 6.2

Thousand Oceans

#5E7480 · ΔE 6.6

Stratford Blue

#7685A1 · ΔE 6.7

Built by DSGN.HOUSE Updated 2026

Our color tools run on our own catalogue of 26,000+ real paint colors across 16 brands — Benjamin Moore, Sherwin-Williams, Behr, Dulux, RAL and more — with the color math (HSL and CIELAB matching) computed in-house, not scraped from summaries. Every color you pick maps to a real, buyable paint with its code, so what you see here you can actually take to the store. We review and update these tools and their data regularly.

Created by Denis Kataev, founder of DSGN.HOUSE — a software engineer and digital entrepreneur building professional color-design tools for everyone.

Frequently Asked Questions

What color is #66778D?

#66778D is Thundering Clouds, a mid-tone blue with a cool undertone.

Is #66778D warm or cool?

Thundering Clouds reads cool, which influences how it interacts with surrounding tones and natural light.

What rooms work best with Thundering Clouds?

Thundering Clouds works well in bedrooms, bathrooms, home offices. Designers typically use it for main walls, ceilings, trim, cabinetry.

What colors pair well with Thundering Clouds?

Thundering Clouds pairs naturally with warm white trim, oak or walnut, brass or matte black hardware. Its complementary color is also a strong contrast option for accents.

Where can I download Thundering Clouds?

You can download Thundering Clouds on DSGN.HOUSE in 15 designer formats including CSS gradient, Figma, Procreate swatches, Tailwind config, Adobe ASE, SVG, and 4K wallpapers — all free.

What's the hex code for Thundering Clouds?

The hex code is #66778D. In RGB it's 102, 119, 141, and in HSL it's 214°, 16%, 48%.

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