Emerald Lake Hills, CA climate
Emerald Lake Hills has warm winters and pleasant summers, with very little rain. A typical July afternoon reaches 79°, a January night drops to 40°, and snow is almost unheard of.
NOAA 1991-2020 climate normals Updated once a decade10° warmer than normal today. The forecast high is 86°, and a typical Oct 1 in Emerald Lake Hills peaks around 76°.Live forecast: National Weather Service · Normal: NOAA 1991–2020
What a year in Emerald Lake Hills feels like
Winter
Spring
Summer
Fall
Emerald Lake Hills weather by month
Average highs, lows, rain and snow for every month, from NOAA’s 1991–2020 normals.
| Month | High | Low | Rain + melt | Snow | Wet days | Snow on ground | 30-yr range |
|---|---|---|---|---|---|---|---|
| January | 59° | 40° | 4.5" | 0 | 9 | 0 | 46° – 54° |
| February | 61° | 42° | 4.5" | 0 | 9 | 0 | 48° – 57° |
| March | 64° | 44° | 3.5" | 0 | 9 | 0 | 49° – 59° |
| April | 67° | 45° | 1.6" | 0 | 5 | 0 | 52° – 59° |
| May | 71° | 49° | 0.7" | 0 | 3 | 0 | 56° – 65° |
| June | 76° | 51° | 0.2" | 0 | 1 | 0 | 60° – 66° |
| July | 79° | 54° | 0.0" | 0 | 0 | 0 | 63° – 70° |
| August | 79° | 54° | 0.0" | 0 | 0 | 0 | 65° – 70° |
| September | 79° | 53° | 0.1" | 0 | 1 | 0 | 63° – 70° |
| October | 74° | 49° | 1.0" | 0 | 3 | 0 | 59° – 67° |
| November | 65° | 44° | 2.3" | 0 | 6 | 0 | 49° – 57° |
| December | 59° | 40° | 4.5" | 0 | 9 | 0 | 46° – 54° |
| Year | 69° | 47° | 22.8" | 0.0" | 55 | 0 |
“Wet days” have at least 0.01" of rain or melted snow. “Snow on ground” counts days with 1" or more. The 30-year range is the coldest and warmest that month’s average temperature got between 1991 and 2020.
Rain and snow in Emerald Lake Hills
Emerald Lake Hills gets 23 inches of rain and melted snow a year. December is the wettest month and July the driest. Rain or snow falls on about 55 days a year.
A year-round growing season
Heating and cooling a home in Emerald Lake Hills
Engineers use “degree days” to estimate how hard a furnace or air conditioner works. In Emerald Lake Hills, 84% of that work is heating and 16% is cooling, so the furnace matters far more than the air conditioner.
Degree days measure how far each day’s average temperature falls below or rises above 65°, added up over a year. Source: NOAA station normals.
Emerald Lake Hills and its neighbors
Emerald Lake Hills borders 1 town with climate data. January nights across them vary by 3.5°. Redwood City has both the coldest January nights (44°) and the hottest July afternoons (72°). Emerald Lake Hills’s January low is 40° and its July high 79°.
Temperatures and rain come from NOAA’s 5 km grid, so each town gets its own value.
How Emerald Lake Hills compares
Compared with every U.S. town and city on TownTapestry, each counted once.
Warmer than it used to be
The last 30 years in Emerald Lake Hills averaged 1.7° warmer than the 1900s. The biggest change is in January (+2.2°). The shift is larger than in 83% of U.S. towns.
Change by month1991–2020 average minus 1901–2000 average, at Emerald Lake Hills’s spot on NOAA’s grid
How much a month can swing
A normal is an average, and real years wander around it. March swings the most: between 1991 and 2020 its average temperature ranged from 49° to 59°. August is the most reliable, staying within 5°.
Common questions about Emerald Lake Hills’s climate
What is the coldest month in Emerald Lake Hills?
December, with a typical high of 59° and a low of 40°.
What is the hottest month in Emerald Lake Hills?
August, with a typical high of 79° and a low of 54°. About 18 days a year reach 90°.
How much snow does Emerald Lake Hills get?
Almost none. A normal year brings 0.0 inches.
When is the first frost in Emerald Lake Hills?
Frost is uncommon. Only 88% of years see a night at 32° or below.
What is the rainiest month in Emerald Lake Hills?
December, with 4.5 inches of rain and melted snow. The year totals 23 inches.
Temperatures and rainfall come from NOAA’s gridded climate normals for Emerald Lake Hills itself (about a 3-mile square). Snow, frost dates and day counts come from NOAA’s weather station at Redwood City, CA (2 mi) away. Normals are 30-year averages, not a forecast. Source: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000.