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2024 Compare Climate & Weather:
Castro Valley, CA vs Flagstaff, AZ

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Highlights

On average, there are 266 sunny days per year in Flagstaff. Castro Valley averages 261 sunny days per year. The US average is 205 sunny days.

Flagstaff, Arizona gets 20.7 inches of rain, on average, per year. Castro Valley, California gets 21.3 inches of rain, on average, per year. The US average is 38.1 inches of rain per year.

Flagstaff averages 81 inches of snow per year. Castro Valley averages 0 inches of snow per year. The US average is 27.8 inches of snow per year.


Weather Highlights

Flagstaff, Arizona
Summer High:
the July high is around 81.7 degrees
Winter Low: the January low is 14.3
Rain: averages 20.7 inches of rain a year
Snow: averages 81 inches of snow a year

Castro Valley, California
Summer High:
the July high is around 75.6 degrees
Winter Low: the January low is 41.6
Rain: averages 21.3 inches of rain a year
Snow: averages 0 inches of snow a year


BESTPLACES COMFORT INDEX
Flagstaff

The annual BestPlaces Comfort Index for Flagstaff is 6.9 (10=best), which means it is one of the least comfortable places in Arizona.

6.9 / 10
June, August and July are the most pleasant months in Flagstaff, while January and February are the least comfortable months.

Castro Valley

The annual BestPlaces Comfort Index for Castro Valley is 8.6 (10=best), which means it is more comfortable than most places in California.

8.6 / 10
September, August and July are the most pleasant months in Castro Valley, while December and January are the least comfortable months.


Today's Weather - Castro Valley, CA

8 AM PST

Partly Sunny

52°F

DAYDESCRIPTIONHIGH / LOWWIND
TodayPartly Sunny64° / 52°WSW 8 to 18 mph
FridayPartly Sunny64° / 47°W 12 to 18 mph
SaturdaySunny68° / 48°W 6 to 16 mph
SundaySunny69° / 48°WSW 7 to 15 mph
MondaySunny70° / 47°WSW 8 to 14 mph
TuesdaySunny73° / 48°WSW 6 to 14 mph
WednesdaySunny70° / 48°WSW 8 to 15 mph

Today's Weather - Flagstaff, AZ

8 AM PST

Showers And Thunderstorms Likely

47°F

DAYDESCRIPTIONHIGH / LOWWIND
TodayShowers And Thunderstorms Likely54° / 33°SW 8 to 16 mph
FridayShowers And Thunderstorms Likely55° / 31°SW 10 to 24 mph
SaturdayChance Rain And Snow Showers then Chance Showers And Thunderstorms51° / 29°SW 12 to 18 mph
SundaySunny62° / 32°W 8 to 16 mph
MondaySunny68° / 36°SW 6 to 15 mph
TuesdaySunny71° / 40°SW 6 to 16 mph
WednesdaySunny73° / 40°SW 7 to 18 mph

Average Monthly High / Low (°F)
MonthCastro Valley, CAFlagstaff, AZ
January57° / 42°43° / 14°
February61° / 44°45° / 17°
March64° / 46°51° / 22°
April67° / 48°59° / 27°
May70° / 52°69° / 34°
June74° / 55°79° / 40°
July76° / 57°82° / 49°
August77° / 57°79° / 49°
September77° / 56°74° / 40°
October72° / 52°63° / 30°
November64° / 46°52° / 21°
December57° / 42°43° / 14°

Hot, Freezing, Rainy, Snowy Days: Castro Valley / Flagstaff
MonthHot DaysFreezing DaysRainy DaysSnowy Days
January0 / 02 / 3011 / 70 / 6
February0 / 00 / 2711 / 70 / 6
March0 / 00 / 299 / 70 / 5
April0 / 00 / 236 / 50 / 3
May1 / 00 / 143 / 40 / 0
June2 / 10 / 51 / 30 / 0
July3 / 20 / 00 / 120 / 0
August3 / 00 / 00 / 140 / 0
September3 / 00 / 51 / 80 / 0
October0 / 00 / 204 / 60 / 1
November0 / 00 / 287 / 50 / 3
December0 / 02 / 3012 / 60 / 6
September is the hottest month for Castro Valley with an average high temperature of 77.3°, which ranks it as cooler than most places in California. In Castro Valley, there are 6 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Castro Valley are September, August and July.

July is the hottest month for Flagstaff with an average high temperature of 81.7°, which ranks it as one of the coolest places in Arizona. In Flagstaff, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Flagstaff are June, August and July.


January has the coldest nighttime temperatures for Castro Valley with an average of 41.6°. This is warmer than most places in California.

January has the coldest nighttime temperatures for Flagstaff with an average of 14.3°. This is one of the coldest places in Arizona.



In Castro Valley, there are 12.0 days annually when the high temperature is over 90°, which is cooler than most places in California.

In Flagstaff, there are 3.4 days annually when the high temperature is over 90°, which is one of the coolest places in Arizona.



In Castro Valley, there are 3.7 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in California.

In Flagstaff, there are 210.5 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Arizona.



In Castro 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 Flagstaff, there are 7.8 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Arizona.



February is the wettest month in Castro Valley with 4.0 inches of rain, and the driest month is July with 0.0 inches. The wettest season is Spring with 55% of yearly precipitation and 1% occurs in Autumn, which is the driest season. The annual rainfall of 21.3 inches in Castro Valley means that it is wetter than most places in California.


August is the wettest month in Flagstaff with 3.3 inches of rain, and the driest month is June with 0.3 inches. The wettest season is Autumn with 29% of yearly precipitation and 17% occurs in Summer, which is the driest season. The annual rainfall of 20.7 inches in Flagstaff means that it is wetter than most places in Arizona.


December is the rainiest month in Castro Valley with 11.6 days of rain, and July is the driest month with only 0.1 rainy days. There are 66.0 rainy days annually in Castro Valley, which is rainier than most places in California. The rainiest season is Spring when it rains 51% of the time and the driest is Autumn with only a 2% chance of a rainy day.

August is the rainiest month in Flagstaff with 13.8 days of rain, and June is the driest month with only 2.8 rainy days. There are 83.4 rainy days annually in Flagstaff, which is one of the rainiest places in Arizona. The rainiest season is Autumn when it rains 34% of the time and the driest is Summer with only a 20% chance of a rainy day.



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

An annual snowfall of 81.0 inches in Flagstaff means that it is one of the snowiest places in Arizona.



Any measurable snowfall is a rare occurance in Castro Valley.

January is the snowiest month in Flagstaff with 19.1 inches of snow, and 8 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 Castro Valley    2 Reviews

Over 15 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 15 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

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Start Your Review of Castro Valley

Reviews for Flagstaff    2 Reviews

Over 15 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 15 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 Flagstaff

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ZIPS IN CASTRO VALLEY, CALIFORNIA
94546, 94552
ZIPS IN FLAGSTAFF, ARIZONA
86001, 86004, 86011

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