Skyline Ridge Preserve, California climate: Climate normals at a NOAA weather station
Skyline Ridge Preserve's normal year runs from 40°F December nights to 81°F August afternoons, with 42.2 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 13.9°C, December lows of 5°C, August highs of 27°C, 1,072 mm of precipitation a year.
- NOAA stationSkyline Ridge Preserve
- Station IDUSC00048273
- Location37.31°N 122.19°W
- Elevation2,270 ft (692 m)
On October 23, the normal high in Skyline Ridge Preserve is 69°F and the normal low 50°F, and the chance of measurable rain or snow is 22%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Skyline Ridge Preserve.
- Jan 55° 41°
- Feb 55° 40°
- Mar 58° 41°
- Apr 62° 43°
- May 67° 47°
- Jun 75° 52°
- Jul 81° 58°
- Aug 81° 59°
- Sep 79° 57°
- Oct 71° 52°
- Nov 60° 44°
- Dec 54° 40°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Skyline Ridge Preserve each month?
August is the warmest month, with normal highs of 81°F; December the coldest, with normal lows of 40°F. The most precipitation falls in December (8.41 in), the least in July (0.04 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 55°F | 41°F | 47.8°F | 7.77 | 14 | <1 | 3 | 9 h 50 min |
| February | 55°F | 40°F | 47.7°F | 7.97 | 14 | <1 | 2 | 10 h 50 min |
| March | 58°F | 41°F | 49.8°F | 6.32 | 13 | <1 | 2 | 11 h 50 min |
| April | 62°F | 43°F | 52.1°F | 3.37 | 10 | <1 | 1 | 13 h 10 min |
| May | 67°F | 47°F | 57.0°F | 1.29 | 7 | <1 | <1 | 14 h 10 min |
| June | 75°F | 52°F | 63.6°F | 0.42 | 3 | 2 | <1 | 14 h 40 min |
| July | 81°F | 58°F | 69.2°F | 0.04 | 1 | 4 | <1 | 14 h 30 min |
| August | 81°F | 59°F | 69.7°F | 0.11 | 2 | 4 | <1 | 13 h 40 min |
| September | 79°F | 57°F | 68.0°F | 0.18 | 2 | 3 | <1 | 12 h 30 min |
| October | 71°F | 52°F | 61.4°F | 1.73 | 5 | 1 | <1 | 11 h 20 min |
| November | 60°F | 44°F | 52.4°F | 4.60 | 11 | <1 | 1 | 10 h 10 min |
| December | 54°F | 40°F | 47.0°F | 8.41 | 15 | <1 | 3 | 9 h 40 min |
| Year (annual) | 67°F | 48°F | 57.1°F | 42.21 | 98 | 13 | 11 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 13°C | 5°C | 8.8°C | 197 mm |
| February | 13°C | 5°C | 8.7°C | 202 mm |
| March | 15°C | 5°C | 9.9°C | 161 mm |
| April | 16°C | 6°C | 11.2°C | 86 mm |
| May | 19°C | 8°C | 13.9°C | 33 mm |
| June | 24°C | 11°C | 17.6°C | 11 mm |
| July | 27°C | 14°C | 20.7°C | 1 mm |
| August | 27°C | 15°C | 20.9°C | 3 mm |
| September | 26°C | 14°C | 20.0°C | 5 mm |
| October | 22°C | 11°C | 16.3°C | 44 mm |
| November | 16°C | 7°C | 11.3°C | 117 mm |
| December | 12°C | 5°C | 8.3°C | 214 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00048273; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
Which months are mildest at Skyline Ridge Preserve?
Normal highs sit between 65°F and 85°F in May, June, July, August, September and October. Of those, July has the fewest days with rain (1).
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00048273.
When is the last frost at Skyline Ridge Preserve?
In Skyline Ridge Preserve, the last spring frost (32°F) comes after March 21 in half of years and after April 28 in one year in ten; the first autumn frost comes before December 15 in half of years and before November 21 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- March 211 year in 10 after April 28; 9 in 10 after January 19
- First autumn frost, half of years before
- December 151 year in 10 before November 21; 9 in 10 before January 30
NOAA puts the median frost-free season at 275 days, and the season without a hard freeze (28°F) at 361 days.
A hard freeze (28°F) comes after January 29 in half of springs and before January 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Skyline Ridge Preserve in zone 9b in ZIP code 94020, the nearest ZIP area.
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00048273; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get at Skyline Ridge Preserve?
In a normal year in Skyline Ridge Preserve, 13 days a year reach 90°F, 11 nights fall to 32°F or colder and 98 days bring measurable precipitation.
- Days at 90°F or more
- 13a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 11a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 98a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00048273.
How sunny is it at Skyline Ridge Preserve?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds at Skyline Ridge Preserve, 4.7 kWh per square metre a day. June is the sunniest month (84%) and December the cloudiest (74%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 76% | 2.5 |
| February | 77% | 3.4 |
| March | 79% | 4.6 |
| April | 82% | 6.0 |
| May | 81% | 6.7 |
| June | 84% | 7.3 |
| July | 78% | 6.5 |
| August | 77% | 5.8 |
| September | 82% | 5.1 |
| October | 83% | 4.0 |
| November | 81% | 2.8 |
| December | 74% | 2.1 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How many heating and cooling degree days does Skyline Ridge Preserve record?
A normal year at Skyline Ridge Preserve brings 3,574 heating degree days, 33% fewer than the median U.S. place (5,373), and 725 cooling degree days, 20% fewer than the median (908). Six months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,234 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 534 | 0 |
| February | 484 | 0 |
| March | 470 | 1 |
| April | 395 | 8 |
| May | 286 | 40 |
| June | 135 | 93 |
| July | 50 | 179 |
| August | 40 | 185 |
| September | 65 | 155 |
| October | 171 | 58 |
| November | 385 | 7 |
| December | 559 | 0 |
| Year (annual) | 3,574 | 725 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00048273. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
Have recent years at Skyline Ridge Preserve been warmer than normal?
2023 averaged 55.1°F, 2.0°F below the 1991-2020 normal of 57.1°F. 1 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 57.7°F | +0.6°F | – |
| 2023 | 55.1°F | −2.0°F | 45.85 |
Source: observed years: ACIS, station USC00048273. A year counts only with all twelve months complete.
How does Skyline Ridge Preserve's climate compare?
Skyline Ridge Preserve is warmer than 50 of the 219 places with their own NOAA record in California, and wetter than 191. Across the 7,247 U.S. stations with normals, its annual mean of 57.1°F is warmer than 67%.
In the Köppen classification computed from these normals, Skyline Ridge Preserve is Csb: temperate, dry-summer, warm summer. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Which places near Skyline Ridge Preserve share this climate record?
3 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Los Altos Hills, CA8,435 people · 4 mi NE
- Portola Valley, CA4,282 people · 4 mi NW
- La Honda, CA1,094 people · 4 mi W
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Skyline Ridge Preserve's climate
What is the coldest month at Skyline Ridge Preserve?
December, with a normal high of 54°F and a normal low of 40°F. The warmest is August (81°F by day, 59°F at night).
What is the rainiest month at Skyline Ridge Preserve?
December, with 8.41 in of precipitation in a normal year; the driest is July with 0.04 in.
What plant hardiness zone is Skyline Ridge Preserve in?
The USDA's 2023 map puts Skyline Ridge Preserve in zone 9b in ZIP code 94020, the nearest ZIP area.
How late can frost come at Skyline Ridge Preserve?
In half of years the last 32°F night comes after March 21; in one year in ten it comes after April 28. Waiting until April 28 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Woodside, CA9 miles from this station, 60.1°F a year
- Palo Alto, CA9 miles from this station, 58.5°F a year
- San Gregorio (2 mi SE), CA10 miles from this station, 54.8°F a year
- Sunnyvale, CA10 miles from this station, 59.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made