The remote server returned an error: (400) Bad Request.The remote server returned an error: (400) Bad Request. 2025 Compare Climate & Weather: Portola Valley, CA vs Rocky River, OH

2025 Compare Climate & Weather:
Portola Valley, CA vs Rocky River, OH

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Highlights

On average, there are 161 sunny days per year in Rocky River. Portola Valley averages 262 sunny days per year. The US average is 205 sunny days.

Rocky River, Ohio gets 38.3 inches of rain, on average, per year. Portola Valley, California gets 30.7 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Rocky River averages 53.3 inches of snow per year. Portola Valley averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.

Weather Highlights

Rocky River, Ohio
Summer High: the July high is around 83.2 degrees
Winter Low: the January low is 22
Rain: averages 38.3 inches of rain a year
Snow: averages 53.3 inches of snow a year

Portola Valley, California
Summer High: the July high is around 77.2 degrees
Winter Low: the January low is 40.8
Rain: averages 30.7 inches of rain a year
Snow: averages 0 inches of snow a year

BestPlaces Comfort Index
Rocky River

The annual BestPlaces Comfort Index for Rocky River is 6.9 (10=best), which means it is less comfortable than most places in Ohio.

6.9 / 10
June, September and August are the most pleasant months in Rocky River, while January and February are the least comfortable months.

Portola Valley

The annual BestPlaces Comfort Index for Portola Valley is 8.4 (10=best), which means it is more comfortable than most places in California.

8.4 / 10
September, August and July are the most pleasant months in Portola Valley, while January and December are the least comfortable months.

Average Monthly High / Low (°F)
MonthPortola Valley, CARocky River, OH
January59° / 41°35° / 22°
February61° / 42°38° / 24°
March64° / 43°47° / 30°
April67° / 44°60° / 41°
May70° / 47°70° / 51°
June74° / 50°79° / 61°
July77° / 52°83° / 65°
August78° / 52°81° / 64°
September77° / 51°75° / 57°
October73° / 48°63° / 46°
November64° / 44°51° / 38°
December59° / 41°39° / 27°
Hot, Freezing, Rainy, Snowy Days: Portola Valley / Rocky River
MonthHot DaysFreezing DaysRainy DaysSnowy Days
January0 / 05 / 2511 / 140 / 10
February0 / 02 / 2211 / 120 / 8
March0 / 01 / 1910 / 120 / 6
April1 / 00 / 57 / 130 / 2
May1 / 00 / 04 / 120 / 0
June3 / 30 / 02 / 110 / 0
July5 / 40 / 01 / 100 / 0
August5 / 30 / 01 / 90 / 0
September4 / 10 / 02 / 90 / 0
October2 / 00 / 14 / 110 / 0
November0 / 02 / 88 / 130 / 2
December0 / 05 / 2211 / 140 / 8
August is the hottest month for Portola Valley with an average high temperature of 77.6°, which ranks it as cooler than most places in California. In Portola Valley, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Portola Valley are August, September and July.

July is the hottest month for Rocky River with an average high temperature of 83.2°, which ranks it as cooler than most places in Ohio. In Rocky River, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Rocky River are June, August and September.
December has the coldest nighttime temperatures for Portola Valley with an average of 40.7°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Rocky River with an average of 22.0°. This is one of the warmest places in Ohio.

In Portola Valley, there are 19.7 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Rocky River, there are 10.4 days annually when the high temperature is over 90°, which is about average compared to other places in Ohio.

In Portola Valley, there are 14.8 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in California.

In Rocky River, there are 100.9 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Ohio.

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

In Rocky River, there are 2.0 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Ohio.

February is the wettest month in Portola Valley with 6.0 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 58% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 30.7 inches in Portola Valley means that it is wetter than most places in California.


August is the wettest month in Rocky River with 3.8 inches of rain, and the driest month is February with 2.1 inches. The wettest season is Autumn with 29% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 38.3 inches in Rocky River means that it is drier than most places in Ohio.

February is the rainiest month in Portola Valley with 11.2 days of rain, and July is the driest month with only 1.0 rainy days. There are 72.9 rainy days annually in Portola Valley, which is rainier than most places in California. The rainiest season is Spring when it rains 45% of the time and the driest is Autumn with only a 6% chance of a rainy day.

December is the rainiest month in Rocky River with 14.0 days of rain, and August is the driest month with only 9.3 rainy days. There are 140.0 rainy days annually in Rocky River, which is rainier than most places in Ohio. The rainiest season is Spring when it rains 28% of the time and the driest is Autumn with only a 21% chance of a rainy day.

There is rarely any recorded snowfall in Portola Valley, ranking it as one of the least snowy places in California.

An annual snowfall of 53.3 inches in Rocky River means that it is one of the snowiest places in Ohio.
Any measurable snowfall is a rare occurance in Portola Valley.

January is the snowiest month in Rocky River with 15.0 inches of snow, and 6 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 Portola Valley    2 Reviews
Jill · Sherman Oaks, CA
re:
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
NC For Me · Apex, NC
re:
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 Portola Valley

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Reviews for Rocky River    2 Reviews
Jill · Sherman Oaks, CA
re:
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
NC For Me · Apex, NC
re:
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 Rocky River

See all reviews
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Zips In Portola Valley, California
94028
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