2025 Compare Climate & Weather:
Black Diamond, WA vs Charleston, SC

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Highlights

On average, there are 209 sunny days per year in Charleston. Black Diamond averages 156 sunny days per year. The US average is 205 sunny days.

Charleston, South Carolina gets 48.3 inches of rain, on average, per year. Black Diamond, Washington gets 50 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Charleston averages 0.4 inches of snow per year. Black Diamond averages 4.7 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Charleston, South Carolina
Summer High:
the July high is around 89.9 degrees
Winter Low: the January low is 39.3
Rain: averages 48.3 inches of rain a year
Snow: averages 0.4 inches of snow a year

Black Diamond, Washington
Summer High:
the July high is around 75.7 degrees
Winter Low: the January low is 34.7
Rain: averages 50 inches of rain a year
Snow: averages 4.7 inches of snow a year

BestPlaces Comfort Index
Charleston

The annual BestPlaces Comfort Index for Charleston is 7.2 (10=best), which means it is less comfortable than most places in South Carolina.

7.2 / 10
October, April and May are the most pleasant months in Charleston, while July and August are the least comfortable months.

Black Diamond

The annual BestPlaces Comfort Index for Black Diamond is 7.0 (10=best), which means it is less comfortable than most places in Washington.

7 / 10
August, July and September are the most pleasant months in Black Diamond, while December and January are the least comfortable months.

Today's Weather - Black Diamond, WA

10 PM PST

Chance Rain Showers

45°F

DAYDESCRIPTIONHIGH / LOWWIND
TonightChance Rain Showers39° / 54°SSW 5 to 9 mph
Monday NightMostly Cloudy37° / 59°SSW 3 mph
Tuesday NightMostly Clear37° / 63°ENE 2 to 6 mph
Wednesday NightClear41° / 72°NE 2 to 6 mph
Thursday NightChance Rain Showers46° / 57°SE 2 to 6 mph
Friday NightRain Showers Likely42° / 56°SW 2 to 6 mph
Saturday NightChance Rain Showers42° / 56°SSW 5 mph
Today's Weather - Charleston, SC

10 PM PST

Mostly Cloudy

67°F

DAYDESCRIPTIONHIGH / LOWWIND
OvernightMostly Cloudy64° / 81°S 0 to 5 mph
Monday NightMostly Cloudy65° / 84°S 3 to 9 mph
Tuesday NightMostly Cloudy66° / 83°S 2 to 9 mph
Wednesday NightSlight Chance Showers And Thunderstorms then Mostly Cloudy66° / 82°SE 2 to 6 mph
Thursday NightSlight Chance Showers And Thunderstorms then Partly Cloudy66° / 82°SE 2 to 7 mph
Friday NightMostly Clear66° / 84°S 2 to 7 mph
Saturday NightSlight Chance Showers And Thunderstorms66° / 81°S 3 to 8 mph
Average Monthly High / Low (°F)
MonthBlack Diamond, WACharleston, SC
January46° / 35°58° / 39°
February49° / 34°61° / 42°
March53° / 37°67° / 48°
April58° / 40°74° / 56°
May64° / 45°81° / 64°
June70° / 49°87° / 72°
July76° / 53°90° / 75°
August76° / 52°89° / 74°
September70° / 48°84° / 69°
October59° / 42°77° / 59°
November50° / 38°69° / 50°
December44° / 33°61° / 42°
Hot, Freezing, Rainy, Snowy Days: Black Diamond / Charleston
MonthHot DaysFreezing DaysRainy DaysSnowy Days
January0 / 010 / 720 / 101 / 0
February0 / 011 / 416 / 81 / 0
March0 / 07 / 119 / 80 / 0
April0 / 02 / 017 / 70 / 0
May0 / 20 / 015 / 70 / 0
June1 / 90 / 011 / 100 / 0
July2 / 150 / 06 / 120 / 0
August1 / 120 / 06 / 120 / 0
September0 / 40 / 09 / 90 / 0
October0 / 02 / 015 / 70 / 0
November0 / 06 / 120 / 71 / 0
December0 / 012 / 519 / 91 / 0
August is the hottest month for Black Diamond with an average high temperature of 76.4°, which ranks it as cooler than most places in Washington. In Black Diamond, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Black Diamond are August, July and September.

July is the hottest month for Charleston with an average high temperature of 89.9°, which ranks it as cooler than most places in South Carolina. In Charleston, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Charleston are October, May and April.
December has the coldest nighttime temperatures for Black Diamond with an average of 33.2°. This is about average compared to other places in Washington.

January has the coldest nighttime temperatures for Charleston with an average of 39.3°. This is one of the warmest places in South Carolina.

In Black Diamond, there are 3.3 days annually when the high temperature is over 90°, which is about average compared to other places in Washington.

In Charleston, there are 41.1 days annually when the high temperature is over 90°, which is cooler than most places in South Carolina.

In Black Diamond, there are 49.9 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Washington.

In Charleston, there are 17.5 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in South Carolina.

In Black Diamond, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Washington.

In Charleston, there are 0.0 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in South Carolina.

November is the wettest month in Black Diamond with 7.9 inches of rain, and the driest month is July with 1.3 inches. The wettest season is Spring with 34% of yearly precipitation and 11% occurs in Autumn, which is the driest season. The annual rainfall of 50.0 inches in Black Diamond means that it is wetter than most places in Washington.


August is the wettest month in Charleston with 6.7 inches of rain, and the driest month is May with 2.5 inches. The wettest season is Autumn with 36% of yearly precipitation and 19% occurs in Summer, which is the driest season. The annual rainfall of 48.3 inches in Charleston means that it is wetter than most places in South Carolina.

November is the rainiest month in Black Diamond with 20.3 days of rain, and August is the driest month with only 5.8 rainy days. There are 173.6 rainy days annually in Black Diamond, which is rainier than most places in Washington. The rainiest season is Spring when it rains 31% of the time and the driest is Autumn with only a 14% chance of a rainy day.

August is the rainiest month in Charleston with 11.7 days of rain, and May is the driest month with only 6.8 rainy days. There are 105.9 rainy days annually in Charleston, which is rainier than most places in South Carolina. The rainiest season is Autumn when it rains 32% of the time and the driest is Summer with only a 21% chance of a rainy day.

An annual snowfall of 4.7 inches in Black Diamond means that it is about average compared to other places in Washington.

An annual snowfall of 0.4 inches in Charleston means that it is less snowy than most places in South Carolina.
November is the snowiest month in Black Diamond with 1.4 inches of snow, and 4 months of the year have significant snowfall.

December is the snowiest month in Charleston with 0.2 inches of snow, and no months of the year have significant snowfall.

DID YOU KNOW?

Many people confuse Weather and Climate, but they are different. Weather refers to the conditions of the atmosphere over a short period of time, while Climate refers to the conditions of the atmosphere over a long period of time.

Weather, more specifically, refers to how the atmosphere behaves and its effects on life and human activities. Most people think of Weather in terms of what can be observed: temperature, humidity, precipitation, and cloudy/sunny conditions. Weather conditions constantly change on a minute-to-minute basis.

Climate is a record of the average weather conditions for a given place over a long period of time, often referred to as Climate Normals. A 30-year period of record is a common requirement to be considered a Climate Normal.

Reviews for Black Diamond    2 Reviews

Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't  More

   |    Reply

Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but  More

   |    Reply

Start Your Review of Black Diamond

Reviews for Charleston    2 Reviews

Over 16 years ago

Hi. I'd like to know if you still feel the same way about living in Broomfield. I went there this past July to check it out (along with Lafayette, Boulder (can't  More

   |    Reply

Over 16 years ago

Apex is perfect for what you are looking for. It's close enough to Raleigh, Durham, Chapel Hill to find a job and Cary the next town over, is a little more expensive but  More

   |    Reply

Start Your Review of Charleston

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Zips In Black Diamond, Washington
98010
Zips In CHARLESTON, SOUTH CAROLINA
29412, 29414, 29407, 29403, 29455, 29492, 29401, 29450, 29409, 29424, 10 total
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