Concord Wastewater Treatment Plant, California climate: Climate normals at a NOAA weather station
Concord Wastewater Treatment Plant's normal year runs from 41°F December nights to 88°F August afternoons, with 17.7 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 16.9°C, December lows of 5°C, August highs of 31°C, 451 mm of precipitation a year.
- NOAA stationConcord Wastewater Treatment Plant
- Station IDUSC00041967
- Location37.98°N 122.07°W
- Elevation40 ft (12 m)
On October 24, the normal high in Concord Wastewater Treatment Plant is 76°F and the normal low 52°F, and the chance of measurable rain or snow is 12%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Concord Wastewater Treatment Plant.
- Jan 58° 42°
- Feb 63° 44°
- Mar 68° 47°
- Apr 72° 49°
- May 78° 53°
- Jun 85° 57°
- Jul 88° 58°
- Aug 88° 59°
- Sep 86° 58°
- Oct 78° 53°
- Nov 67° 46°
- Dec 59° 41°
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 Concord Wastewater Treatment Plant each month?
August is the warmest month, with normal highs of 88°F; December the coldest, with normal lows of 41°F. The most precipitation falls in February (3.57 in), the least in July (0.00 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 58°F | 42°F | 50.1°F | 3.46 | 10 | <1 | 2 | 9 h 50 min |
| February | 63°F | 44°F | 53.7°F | 3.57 | 10 | <1 | <1 | 10 h 50 min |
| March | 68°F | 47°F | 57.2°F | 2.57 | 8 | <1 | <1 | 11 h 50 min |
| April | 72°F | 49°F | 60.7°F | 1.23 | 5 | 1 | <1 | 13 h 10 min |
| May | 78°F | 53°F | 65.5°F | 0.61 | 3 | 3 | <1 | 14 h 10 min |
| June | 85°F | 57°F | 70.7°F | 0.12 | 1 | 8 | <1 | 14 h 50 min |
| July | 88°F | 58°F | 73.3°F | 0.00 | <1 | 12 | <1 | 14 h 30 min |
| August | 88°F | 59°F | 73.5°F | 0.02 | <1 | 12 | <1 | 13 h 40 min |
| September | 86°F | 58°F | 71.9°F | 0.06 | 1 | 9 | <1 | 12 h 30 min |
| October | 78°F | 53°F | 65.6°F | 0.68 | 3 | 2 | <1 | 11 h 20 min |
| November | 67°F | 46°F | 56.3°F | 1.87 | 6 | <1 | <1 | 10 h 10 min |
| December | 59°F | 41°F | 49.9°F | 3.55 | 9 | <1 | 2 | 9 h 30 min |
| Year (annual) | 74°F | 51°F | 62.4°F | 17.74 | 56 | 47 | 4 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 15°C | 5°C | 10.1°C | 88 mm |
| February | 17°C | 7°C | 12.1°C | 91 mm |
| March | 20°C | 8°C | 14.0°C | 65 mm |
| April | 22°C | 10°C | 15.9°C | 31 mm |
| May | 26°C | 12°C | 18.6°C | 15 mm |
| June | 29°C | 14°C | 21.5°C | 3 mm |
| July | 31°C | 15°C | 22.9°C | 0 mm |
| August | 31°C | 15°C | 23.1°C | 1 mm |
| September | 30°C | 14°C | 22.2°C | 2 mm |
| October | 26°C | 12°C | 18.7°C | 17 mm |
| November | 19°C | 8°C | 13.5°C | 47 mm |
| December | 15°C | 5°C | 9.9°C | 90 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00041967; 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 Concord Wastewater Treatment Plant?
Normal highs sit between 65°F and 85°F in March, April, May, June, October and November. Of those, June 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 USC00041967.
When is the last frost at Concord Wastewater Treatment Plant?
In Concord Wastewater Treatment Plant, the last spring frost (32°F) comes after January 7 in half of years and after February 1 in one year in ten; the first autumn frost comes before December 19 in half of years and before December 1 in one year in ten. A night at 32°F or colder comes at all in 80% of years here (NOAA).
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- January 71 year in 10 after February 1; 9 in 10 after December 19
- First autumn frost, half of years before
- December 191 year in 10 before December 1; 9 in 10 before January 12
NOAA puts the median frost-free season at 346 days, and the season without a hard freeze (28°F) at 365 days.
A hard freeze (28°F) comes after December 31 in half of springs and before December 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Concord Wastewater Treatment Plant in zone 9b in ZIP code 94523, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 10a: the coldest night of a typical year reaches 30°F (27 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in California · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00041967; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. 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 Concord Wastewater Treatment Plant?
In a normal year in Concord Wastewater Treatment Plant, 47 days a year reach 90°F (6 of them 100°F or more), 4 nights fall to 32°F or colder and 56 days bring measurable precipitation.
- Days at 90°F or more
- 47a normal year
- Days at 100°F or more
- 6a normal year
- Nights at 32°F or colder
- 4a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 56a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00041967.
How sunny is it at Concord Wastewater Treatment Plant?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds at Concord Wastewater Treatment Plant, 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 Concord Wastewater Treatment Plant record?
A normal year at Concord Wastewater Treatment Plant brings 2,029 heating degree days, 62% fewer than the median U.S. place (5,373), and 1,084 cooling degree days, 19% more than the median (908). Three months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 4,672 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 463 | 0 |
| February | 318 | 0 |
| March | 243 | 3 |
| April | 149 | 21 |
| May | 59 | 76 |
| June | 9 | 179 |
| July | 0 | 258 |
| August | 0 | 264 |
| September | 3 | 208 |
| October | 54 | 74 |
| November | 264 | 3 |
| December | 467 | 0 |
| Year (annual) | 2,029 | 1,084 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00041967. 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.
How does Concord Wastewater Treatment Plant's climate compare?
Concord Wastewater Treatment Plant is warmer than 129 of the 219 places with their own NOAA record in California, and wetter than 122. Across the 7,247 U.S. stations with normals, its annual mean of 62.4°F is warmer than 81%.
In the Köppen classification computed from these normals, Concord Wastewater Treatment Plant is Csa: temperate, dry-summer, hot 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 Concord Wastewater Treatment Plant share this climate record?
9 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.
- Walnut Creek, CAalso near: Concord (6 mi, 62.0°F a year); Mount Diablo Junction (6 mi, 58.4°F a year)70,817 people · 6 mi S
- Pleasant Hill, CA34,169 people · 2 mi S
- Lafayette, CA25,371 people · 7 mi SW
- Contra Costa Centre, CA7,127 people · 4 mi S
- Saranap, CA5,693 people · 7 mi S
- Pacheco, CA4,657 people · 0 mi N
- Reliez Valley, CA3,006 people · 4 mi SW
- Acalanes Ridge, CA1,025 people · 5 mi S
- Shell Ridge, CA998 people · 6 mi S
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 Concord Wastewater Treatment Plant's climate
What is the coldest month at Concord Wastewater Treatment Plant?
December, with a normal high of 59°F and a normal low of 41°F. The warmest is August (88°F by day, 59°F at night).
Does it snow at Concord Wastewater Treatment Plant?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month at Concord Wastewater Treatment Plant?
February, with 3.57 in of precipitation in a normal year; the driest is July with 0.00 in.
What plant hardiness zone is Concord Wastewater Treatment Plant in?
The USDA's 2023 map puts Concord Wastewater Treatment Plant in zone 9b in ZIP code 94523, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 30°F (27 years, 1991-2020): zone 10a.
How late can frost come at Concord Wastewater Treatment Plant?
In half of years the last 32°F night comes after January 7; in one year in ten it comes after February 1. Waiting until February 1 leaves about a one-in-ten chance of a later frost.
Nearby and next
- California climateThe statewide normals and every place in the state
- Concord, CA1 miles from this station, 62.0°F a year
- Martinez, CA3 miles from this station, 58.2°F a year
- Vallejo, CA11 miles from this station, 61.6°F a year
- Mount Diablo Junction, CA11 miles from this station, 58.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made