Smyrna, Washington climate: Climate normals at a NOAA weather station
Smyrna's normal year runs from 26°F December nights to 93°F July afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.9°C, December lows of −4°C, July highs of 34°C.
- NOAA stationSmyrna
- Station IDUSC00457727
- Location46.84°N 119.66°W
- Elevation560 ft (171 m)
On October 23, the normal high in Smyrna is 62°F and the normal low 36°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Smyrna.
- Jan 40° 26°
- Feb 48° 28°
- Mar 58° 33°
- Apr 67° 39°
- May 77° 46°
- Jun 84° 55°
- Jul 93° 59°
- Aug 92° 58°
- Sep 82° 49°
- Oct 67° 39°
- Nov 50° 31°
- Dec 40° 26°
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 Smyrna each month?
July is the warmest month, with normal highs of 93°F; December the coldest, with normal lows of 26°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 40°F | 26°F | 32.9°F | – | <1 | 26 | 9 h |
| February | 48°F | 28°F | 37.8°F | – | <1 | 20 | 10 h 20 min |
| March | 58°F | 33°F | 45.5°F | – | <1 | 17 | 11 h 50 min |
| April | 67°F | 39°F | 52.8°F | – | <1 | 6 | 13 h 30 min |
| May | 77°F | 46°F | 61.7°F | – | 3 | 1 | 15 h |
| June | 84°F | 55°F | 69.1°F | – | 7 | <1 | 15 h 50 min |
| July | 93°F | 59°F | 76.1°F | – | 21 | <1 | 15 h 30 min |
| August | 92°F | 58°F | 74.6°F | – | 18 | <1 | 14 h 20 min |
| September | 82°F | 49°F | 65.3°F | – | 5 | 1 | 12 h 40 min |
| October | 67°F | 39°F | 52.6°F | – | <1 | 9 | 11 h |
| November | 50°F | 31°F | 40.1°F | – | <1 | 18 | 9 h 30 min |
| December | 40°F | 26°F | 32.6°F | – | <1 | 26 | 8 h 30 min |
| Year (annual) | 66°F | 41°F | 53.4°F | – | 54 | 122 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 5°C | −4°C | 0.5°C |
| February | 9°C | −2°C | 3.2°C |
| March | 15°C | 0°C | 7.5°C |
| April | 19°C | 4°C | 11.6°C |
| May | 25°C | 8°C | 16.5°C |
| June | 29°C | 13°C | 20.6°C |
| July | 34°C | 15°C | 24.5°C |
| August | 33°C | 14°C | 23.7°C |
| September | 28°C | 9°C | 18.5°C |
| October | 19°C | 4°C | 11.4°C |
| November | 10°C | −1°C | 4.5°C |
| December | 4°C | −4°C | 0.3°C |
NOAA publishes no 1991-2020 snowfall normal for this station, and no record within 25 miles keeps one, so snow is left out here rather than estimated.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00457727; 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 Smyrna?
Normal highs sit between 65°F and 85°F in April, May, June, September and October.
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 USC00457727.
When is the last frost at Smyrna?
In Smyrna, the last spring frost (32°F) comes after April 23 in half of years and after May 7 in one year in ten; the first autumn frost comes before October 12 in half of years and before October 1 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
- April 231 year in 10 after May 7; 9 in 10 after April 3
- First autumn frost, half of years before
- October 121 year in 10 before October 1; 9 in 10 before October 25
NOAA puts the median frost-free season at 172 days, and the season without a hard freeze (28°F) at 202 days.
A hard freeze (28°F) comes after April 3 in half of springs and before October 24 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Smyrna in zone 7a in ZIP code 99357, 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 7a: the coldest night of a typical year reaches 2°F (15 complete years).
Frost dates for every NOAA station in Washington · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00457727; 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 Smyrna?
In a normal year in Smyrna, 54 days a year reach 90°F (13 of them 100°F or more) and 122 nights fall to 32°F or colder.
- Days at 90°F or more
- 54a normal year
- Days at 100°F or more
- 13a normal year
- Nights at 32°F or colder
- 122a normal year
- Days that stay below freezing
- 15high of 32°F or less
The highest temperature in this station's record (since 1951) is 115°F, on August 4, 1961; the lowest is −24°F, on January 27, 1957.
The wettest calendar year on that record is 1995, with 13.16 in; the snowiest season is 1965–66, with 24.4 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00457727; records: ACIS (NOAA Regional Climate Centers), station USC00457727. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Smyrna?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds at Smyrna, 4.2 kWh per square metre a day. July is the sunniest month (94%) and December the cloudiest (55%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 56% | 1.2 |
| February | 69% | 2.3 |
| March | 72% | 3.6 |
| April | 79% | 5.4 |
| May | 81% | 6.5 |
| June | 85% | 7.2 |
| July | 94% | 7.7 |
| August | 92% | 6.4 |
| September | 87% | 4.7 |
| October | 79% | 3.0 |
| November | 65% | 1.6 |
| December | 55% | 1.0 |
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 Smyrna record?
A normal year at Smyrna brings 5,115 heating degree days, 5% fewer than the median U.S. place (5,373), and 923 cooling degree days, 2% more than the median (908). Seven months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 3,262 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 993 | 0 |
| February | 762 | 0 |
| March | 605 | 0 |
| April | 370 | 2 |
| May | 145 | 41 |
| June | 23 | 147 |
| July | 1 | 343 |
| August | 5 | 302 |
| September | 75 | 84 |
| October | 389 | 3 |
| November | 745 | 0 |
| December | 1,003 | 0 |
| Year (annual) | 5,115 | 923 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00457727. 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 Smyrna's climate compare?
Smyrna is warmer than 89 of the 96 places with their own NOAA record in Washington. Across the 7,247 U.S. stations with normals, its annual mean of 53.4°F is warmer than 55%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Smyrna 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.
- Royal City, WA1,907 people · 5 mi NE
- Beverly, WA283 people · 13 mi W
- Vantage, WA0 people · 17 mi NW
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 Smyrna's climate
What is the coldest month at Smyrna?
December, with a normal high of 40°F and a normal low of 26°F. The warmest is July (93°F by day, 59°F at night).
What plant hardiness zone is Smyrna in?
The USDA's 2023 map puts Smyrna in zone 7a in ZIP code 99357, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 2°F (15 years, 1991-2020): zone 7a.
How late can frost come at Smyrna?
In half of years the last 32°F night comes after April 23; in one year in ten it comes after May 7. Waiting until May 7 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Priest Rapids Dam, WA17 miles from this station, 56.0°F a year
- Quincy, WA28 miles from this station, 51.1°F a year
- Moses Lake, WA30 miles from this station, 50.9°F a year
- Moxee City (10 mi E), WA33 miles from this station, 50.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made