Boca, California climate: Climate normals at a NOAA weather station
Boca's normal year runs from 13°F January nights to 86°F July afternoons, with 22.5 inches of precipitation and 98 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 6.8°C, January lows of −10°C, July highs of 30°C, 573 mm of precipitation a year.
- NOAA stationBoca
- Station IDUSC00040931
- Location39.39°N 120.09°W
- Elevation5,575 ft (1,699 m)
On October 23, the normal high in Boca is 64°F and the normal low 23°F, and the chance of measurable rain or snow is 14%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Boca.
- Jan 44° 13°
- Feb 46° 15°
- Mar 52° 21°
- Apr 58° 25°
- May 67° 31°
- Jun 77° 35°
- Jul 86° 39°
- Aug 85° 37°
- Sep 79° 31°
- Oct 67° 25°
- Nov 54° 20°
- Dec 43° 15°
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 Boca each month?
July is the warmest month, with normal highs of 86°F; January the coldest, with normal lows of 13°F. The most precipitation falls in December (4.12 in), the least in August (0.36 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 44°F | 13°F | 28.5°F | 3.91 | 21.3 | 9 | <1 | 31 | 9 h 40 min |
| February | 46°F | 15°F | 30.8°F | 3.61 | 20.1 | 8 | <1 | 27 | 10 h 40 min |
| March | 52°F | 21°F | 36.2°F | 2.93 | 18.1 | 9 | <1 | 30 | 11 h 50 min |
| April | 58°F | 25°F | 41.4°F | 1.47 | 6.3 | 6 | <1 | 27 | 13 h 10 min |
| May | 67°F | 31°F | 48.9°F | 1.35 | 1.2 | 7 | <1 | 20 | 14 h 20 min |
| June | 77°F | 35°F | 55.8°F | 0.57 | 0.1 | 3 | 2 | 12 | 15 h |
| July | 86°F | 39°F | 62.6°F | 0.48 | 0.0 | 2 | 9 | 5 | 14 h 40 min |
| August | 85°F | 37°F | 61.0°F | 0.36 | 0.0 | 3 | 7 | 9 | 13 h 50 min |
| September | 79°F | 31°F | 55.0°F | 0.48 | 0.1 | 2 | 1 | 21 | 12 h 30 min |
| October | 67°F | 25°F | 46.0°F | 1.26 | 0.7 | 4 | <1 | 28 | 11 h 10 min |
| November | 54°F | 20°F | 36.7°F | 2.00 | 8.0 | 6 | <1 | 29 | 10 h |
| December | 43°F | 15°F | 29.0°F | 4.12 | 22.5 | 10 | <1 | 30 | 9 h 20 min |
| Year (annual) | 63°F | 26°F | 44.3°F | 22.54 | 98.4 | 70 | 19 | 267 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 6°C | −10°C | −1.9°C | 99 mm | 54 cm |
| February | 8°C | −9°C | −0.7°C | 92 mm | 51 cm |
| March | 11°C | −6°C | 2.3°C | 74 mm | 46 cm |
| April | 14°C | −4°C | 5.2°C | 37 mm | 16 cm |
| May | 19°C | 0°C | 9.4°C | 34 mm | 3 cm |
| June | 25°C | 2°C | 13.2°C | 14 mm | 0 cm |
| July | 30°C | 4°C | 17.0°C | 12 mm | 0 cm |
| August | 30°C | 3°C | 16.1°C | 9 mm | 0 cm |
| September | 26°C | 0°C | 12.8°C | 12 mm | 0 cm |
| October | 20°C | −4°C | 7.8°C | 32 mm | 2 cm |
| November | 12°C | −7°C | 2.6°C | 51 mm | 20 cm |
| December | 6°C | −9°C | −1.7°C | 105 mm | 57 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00040931; 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 Boca?
Normal highs sit between 65°F and 85°F in May, June, September and October. Of those, September has the fewest days with rain (2).
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 USC00040931.
How hot and how cold does it get at Boca?
In a normal year in Boca, 19 days a year reach 90°F, 267 nights fall to 32°F or colder and 70 days bring measurable precipitation.
- Days at 90°F or more
- 19a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 267a normal year
- Days that stay below freezing
- 9high of 32°F or less
- Days with 0.01 inch of precipitation
- 70a normal year
- Days with 1 inch of snow or more
- 21a normal year
The highest temperature in this station's record (since 1936) is 103°F, on July 12, 2002; the lowest is −45°F, on January 20, 1937.
The wettest calendar year on that record is 2017, with 46.72 in; the snowiest season is 1951–52, with 306.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00040931; records: ACIS (NOAA Regional Climate Centers), station USC00040931. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Boca?
Over a year 85% of the sunlight that would reach the ground under clear skies gets through the clouds at Boca, 5.1 kWh per square metre a day. July is the sunniest month (95%) and December the cloudiest (69%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 73% | 2.4 |
| February | 72% | 3.2 |
| March | 73% | 4.4 |
| April | 77% | 5.8 |
| May | 82% | 7.1 |
| June | 92% | 8.3 |
| July | 95% | 8.3 |
| August | 95% | 7.4 |
| September | 93% | 5.9 |
| October | 87% | 4.2 |
| November | 77% | 2.7 |
| December | 69% | 2.0 |
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 Boca record?
A normal year at Boca brings 7,581 heating degree days, 41% more than the median U.S. place (5,373), and 59 cooling degree days, 93% fewer than the median (908). Nine months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 1,206 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,133 | 0 |
| February | 958 | 0 |
| March | 893 | 0 |
| April | 707 | 0 |
| May | 499 | 0 |
| June | 283 | 6 |
| July | 109 | 34 |
| August | 143 | 17 |
| September | 303 | 2 |
| October | 589 | 0 |
| November | 848 | 0 |
| December | 1,118 | 0 |
| Year (annual) | 7,581 | 59 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00040931. 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 Boca been warmer than normal?
2025 averaged 47.6°F, 3.4°F above the 1991-2020 normal of 44.3°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 46.6°F | +2.3°F | 28.30 | 146.6 |
| 2022 | 44.6°F | +0.3°F | 16.84 | 82.8 |
| 2023 | 43.3°F | −1.0°F | 31.30 | 153.0 |
| 2024 | 46.7°F | +2.4°F | 22.34 | 131.0 |
| 2025 | 47.6°F | +3.4°F | 29.21 | 63.1 |
Over 72 complete years from 1937 to 2025, the station's annual mean temperature rose at a fitted 3.2°F per century (+0.18°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00040931; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Boca's climate compare?
Boca is warmer than 4 of the 219 places with their own NOAA record in California, and wetter than 148. Across the 7,247 U.S. stations with normals, its annual mean of 44.3°F is warmer than 17%.
In the Köppen classification computed from these normals, Boca is Dsb: continental, 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.
Questions about Boca's climate
What is the coldest month at Boca?
January, with a normal high of 44°F and a normal low of 13°F. The warmest is July (86°F by day, 39°F at night).
Does it snow at Boca?
Yes: 98 inches in a normal year, falling on 28 days with 0.1 inch or more, the most in December (22.5 inches).
What is the rainiest month at Boca?
December, with 4.12 in of precipitation in a normal year; the driest is August with 0.36 in.
What plant hardiness zone is Boca in?
The USDA's 2023 map puts Boca in zone 6b in ZIP code 96111, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches −11°F (21 years, 1991-2020): zone 5b.
Nearby and next
- California climateThe statewide normals and every place in the state
- Truckee, CA6 miles from this station, 44.0°F a year
- Sagehen Creek, CA9 miles from this station, 41.3°F a year
- Donner Mem State Park, CA9 miles from this station, 44.0°F a year
- Verdi, CA10 miles from this station, 49.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made