Spokane, WA climate: monthly averages and frost dates
Spokane, WA has cold winters and warm summers by this site's scale, with semi-arid annual precipitation. The figures are the 1991–2020 climate normals for NOAA station USW00024157 (SPOKANE INTL AP), 5 mi (9 km) in a straight line from the city's center point (US Census).
- Warmest month high
- 84.4°F
- July
- Coldest month mean
- 29.1°F
- December
- Precipitation
- 16.4 in
- per year
- Snowfall
- 45.4 in
- per year
- Median last frost
- April 26
- 32°F, spring
- Median first frost
- October 12
- 32°F, autumn
Monthly averages in Spokane
| Month | High °F | Low °F | Mean °F | Precip. in | Snow in | Days ≥0.01 in | Days ≥90°F | Nights ≤32°F |
|---|---|---|---|---|---|---|---|---|
| January | 34.5 | 24.7 | 29.6 | 1.97 | 12.3 | 14.2 | 0.0 | 25.9 |
| February | 39.5 | 26.3 | 32.9 | 1.44 | 7.8 | 10.9 | 0.0 | 22.9 |
| March | 48.6 | 31.5 | 40.0 | 1.83 | 3.9 | 11.8 | 0.0 | 19.4 |
| April | 56.9 | 37.0 | 47.0 | 1.25 | 0.7 | 10.3 | 0.0 | 8.3 |
| May | 67.1 | 44.9 | 56.0 | 1.55 | 0.1 | 9.7 | 0.3 | 1.5 |
| June | 73.7 | 50.8 | 62.3 | 1.17 | 0.0 | 7.8 | 1.5 | 0.0 |
| July | 84.4 | 57.6 | 71.0 | 0.42 | 0.0 | 4.0 | 9.4 | 0.0 |
| August | 83.8 | 56.7 | 70.3 | 0.47 | 0.0 | 3.2 | 8.3 | 0.0 |
| September | 73.6 | 48.6 | 61.1 | 0.58 | 0.1 | 4.7 | 1.4 | 0.4 |
| October | 57.7 | 38.0 | 47.9 | 1.37 | 0.5 | 8.9 | 0.0 | 7.5 |
| November | 42.3 | 30.3 | 36.3 | 2.06 | 6.2 | 13.4 | 0.0 | 19.2 |
| December | 33.8 | 24.3 | 29.1 | 2.34 | 13.8 | 13.8 | 0.0 | 26.9 |
| Year | 58.0 | 39.2 | 48.6 | 16.45 | 45.4 | 112.7 | 20.8 | 132.0 |
How cold is winter in Spokane?
Winters in Spokane are cold by this site's scale (coldest-month mean 20 to under 32°F). The coldest month is December, with a mean temperature of 29.1°F (−1.6°C), a normal daily high of 33.8°F (1.0°C) and a normal daily low of 24.3°F (−4.3°C).
The station averages 132.0 nights a year at or below 32°F and 33.7 days when the high stays at or below 32°F.
The normal daily low is at or below freezing in November to March.
How hot is summer in Spokane?
Summers in Spokane are warm by this site's scale (hottest-month high 80 to under 90°F). July has the highest normal daily high, 84.4°F (29.1°C), with nights averaging 57.6°F (14.2°C).
The high reaches 90°F or more on 20.8 days in a normal year.
What is the wettest month in Spokane?
Spokane gets 16.45 in (418 mm) of precipitation in a normal year, which this site classes as semi-arid (10 to under 20 in a year). The wettest month is December with 2.34 in (59 mm); the driest is July with 0.42 in (11 mm).
Measurable precipitation (0.01 in or more) falls on 112.7 days a year.
Does it snow in Spokane?
Normal annual snowfall in Spokane is 45.4 in (115 cm), which this site classes as heavy (36 to under 72 in a year).
December is the snowiest month, with 13.8 in (35 cm).
A day with 1.0 in or more of snowfall comes 15.0 times a year on average.
Which months are mild in Spokane?
4 months in Spokane meet this site's comfort thresholds (normal high 65–85°F, low 45°F or higher, fewer than 10 days with 0.10 in or more of precipitation): June to September.
May misses by one threshold only (normal low 44.9°F, below the 45°F limit).
Thresholds and their limits: methodology.
Frost dates and growing season in Spokane
In Spokane the median last spring night at or below 32°F is April 26, and the median first autumn one is October 12 (NOAA P50 dates). NOAA's median length of the freeze-free season is 168 days. NOAA takes that median over each year's own season, so it need not equal the 169 days between the two median dates.
There is still a 10% chance of a 32°F night on or after May 10, and a 10% chance that the first one has come by September 29.
The chance that the last spring 32°F night comes on or after April 9 is 90%.
For a hard freeze (28°F or lower) the median dates are April 6 in spring and October 23 in autumn.
| Chance | Last spring 32°F night on or after | First autumn 32°F night by | Freeze-free season, days |
|---|---|---|---|
| 10% | May 10 | September 29 | 192 |
| 20% | May 5 | October 3 | 183 |
| 30% | May 2 | October 6 | 177 |
| 40% | April 29 | October 9 | 173 |
| 50% | April 26 | October 12 | 168 |
| 60% | April 23 | October 15 | 163 |
| 70% | April 20 | October 18 | 159 |
| 80% | April 15 | October 22 | 155 |
| 90% | April 9 | October 28 | 147 |
| Threshold | Median last date (spring) | Median first date (autumn or winter) | Median season, days |
|---|---|---|---|
| 36°F | May 8 | October 1 | 144 |
| 32°F | April 26 | October 12 | 168 |
| 28°F | April 6 | October 23 | 200 |
| 24°F | March 13 | November 3 | 231 |
| 20°F | March 1 | November 18 | 260 |
| 16°F | February 19 | November 30 | 283 |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 100% | 100% | 100% | 95% | 35% | 0% | 0% | 0% | 12% | 93% | 100% | 100% |
Nearby and similar places
Of the places on this site, the closest to Spokane by station distance are Seattle, WA at 224 mi (360 km), Portland, OR at 279 mi (448 km) and Boise, ID at 287 mi (462 km).
Among places whose winter, summer and precipitation words are each within one band of Spokane's (winter: cold, summer: warm, precipitation: semi-arid), the closest monthly temperature and precipitation patterns are Boise, ID, Salt Lake City, UT and Billings, MT.
Compared with Seattle, WA, Spokane's peak-month normal high is 6.8°F (3.8°C) higher, its coldest-month mean is 12.9°F (7.2°C) lower, and its annual precipitation is 22.89 in less.
| Place | Listed as | Station distance | Coldest mean °F | Warmest high °F | Precip. in/yr | Snow in/yr | Last frost |
|---|---|---|---|---|---|---|---|
| Spokane, WA | this page | – | 29.1 | 84.4 | 16.4 | 45.4 | April 26 |
| Seattle, WA | nearby | 224 mi (360 km) | 42.0 | 77.6 | 39.3 | 6.3 | March 2 |
| Portland, OR | nearby | 279 mi (448 km) | 41.6 | 82.3 | 36.9 | 4.2 | March 13 |
| Boise, ID | nearby, similar | 287 mi (462 km) | 32.1 | 92.7 | 11.5 | 17.6 | April 24 |
| Salt Lake City, UT | similar | 547 mi (880 km) | 31.4 | 94.0 | 15.5 | 51.9 | April 8 |
| Billings, MT | similar | 443 mi (714 km) | 27.0 | 87.3 | 14.3 | 57.4 | May 4 |
How nearby and similar places are chosen: methodology.
Source and station
The data for Spokane come from NOAA station SPOKANE INTL AP, WA US (USW00024157) at 47.6217, -117.5281, elevation 2,353 ft (717 m). It lies 5 mi (9 km) in a straight line from the center point of Spokane city, the “internal point” in the US Census 2024 Gazetteer.
Each monthly normal used here rests on at least 25 years of data from 1991–2020 (NOAA's per-field year counts).
NOAA completeness flags on the monthly fields used here:
- R: Representative: meets WMO standards for data availability for 10 or more years (missing months filled from surrounding stations).
- S: Standard: meets WMO standards for data availability for 24 or more years.
Cite the data as:
Palecki, Michael; Durre, Imke; Applequist, Scott; Arguez, Anthony; Lawrimore, Jay (2021). U.S. Climate Normals 2020: U.S. Monthly Climate Normals (1991-2020). Station USW00024157 (SPOKANE INTL AP, WA US). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/wck8-er13. Accessed 2026-10-09.
Palecki, Michael; Durre, Imke; Applequist, Scott; Arguez, Anthony; Lawrimore, Jay (2021). U.S. Climate Normals 2020: U.S. Annual/Seasonal Climate Normals (1991-2020). Station USW00024157 (SPOKANE INTL AP, WA US). NOAA National Centers for Environmental Information. Dataset. https://doi.org/10.25921/4ek7-fk11. Accessed 2026-10-09.
Files used: monthly normals CSV, annual/seasonal normals CSV (retrieved 2026-10-09). The values on this page as JSON: /us/wa/spokane/data.json.