Mt Vernon, WA Climate: Temperature by Month
Annual temperature and rainfall from NOAA NCEI's 1991–2020 normals →; comfort score computed by PlainClimate
30-year climate normals (1991-2020) from Mt Vernon's primary NOAA station, MT VERNON 3 WNW.
The climate verdict for Mt Vernon
A compact 23.5°F seasonal swing gives Mt Vernon, Washington a steadier-than-extreme annual shape. NOAA reports an annual average of 52°F. August is the warmest month at 64°F and December the coldest at 41°F.
- 52°F
- average temperature, NOAA 1991-2020 normal
- 224 days
- growing season, frost-free days
Mt Vernon: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00455678 · Mt Vernon, WA 52°F mean
TEMP-COOL · RANK-MID · PHOTO-FINISH · PRCP-UNK · SWING-NARROW · COMF-UNK · LOAD-HEAT · STN-1 · BOOK-PART
- TEMP-COOL 52°F
- RANK-MID #3,225
- PHOTO-FINISH ≈ Aberdeen
- PRCP-UNK Rain n/a
- SWING-NARROW 24°F
- COMF-UNK Comfort n/a
- LOAD-HEAT 4,986 HDD
- STN-1 USC00455678
- BOOK-PART 4/6 fields
Nearest mean-temperature peer: Aberdeen, WA ( -0.1 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every WA station list.
- Mt Vernon (this station) 52°F
- Hot Grays Rvr Hatch…, WA 52°F
- Cold Aberdeen, WA 51°F
- Near Astoria, OR 51°F
- Near Everett Snohomi…, WA 51°F
Climate Living Index · Mt Vernon
Mt Vernon: 74/100 · grade B
Mt Vernon publishes 3 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 3 missing weights rescale to 100.
PlainClimate-derived for Mt Vernon, not an official NOAA rating. Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Normal heat + freeze calendar | 0 calendar days | 100/100 · A |
| Frost-free season | 224 days/year | 79/100 · B |
| Annual temperature balance | 51.5°F · 16.0° from 67.5°F | 47/100 · D |
Mt Vernon · 2026-08-04 · NOAA NCEI Climate Normals · method .
National standing · heating-led station
Where Mt Vernon sits across the climate record
Available NOAA 1991–2020 fields for Mt Vernon are ranked only against stations that publish the same field, missing metrics stay blank rather than estimated.
- Annual temperature
- 47th percentile warmth
- Mid-pack annual mean versus 6,861 station normals.
- Seasonal temperature swing
- Narrower than 95%
- Warmest-to-coldest month gap for Mt Vernon is compact versus 6,861 complete station-years.
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 47°F (8°C) | 35°F (2°C) | 41°F (5°C) | N/A | 11.5 | 0.0 |
| February | 50°F (10°C) | 35°F (2°C) | 42°F (6°C) | N/A | 9.9 | 0.0 |
| March | 54°F (12°C) | 38°F (3°C) | 46°F (8°C) | N/A | 5.3 | 0.0 |
| April | 58°F (15°C) | 41°F (5°C) | 50°F (10°C) | N/A | 1.2 | 0.0 |
| May | 65°F (18°C) | 47°F (8°C) | 56°F (13°C) | N/A | 0.1 | 0.0 |
| June | 69°F (20°C) | 51°F (10°C) | 60°F (15°C) | N/A | 0.0 | 0.1 |
| July | 73°F (23°C) | 54°F (12°C) | 63°F (17°C) | N/A | 0.0 | 0.1 |
| August | 75°F (24°C) | 53°F (12°C) | 64°F (18°C) | N/A | 0.0 | 0.1 |
| September | 69°F (20°C) | 49°F (9°C) | 59°F (15°C) | N/A | 0.1 | 0.0 |
| October | 59°F (15°C) | 43°F (6°C) | 51°F (11°C) | N/A | 1.2 | 0.0 |
| November | 51°F (11°C) | 39°F (4°C) | 45°F (7°C) | N/A | 6.9 | 0.0 |
| December | 46°F (8°C) | 35°F (2°C) | 41°F (5°C) | N/A | 10.2 | 0.0 |
The year, day by day
The calendar barely moves in Mt Vernon: no date carries a normal high of 90°F or a normal low at freezing. The year runs between 35°F near December 27 and 76°F near August 3.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 35°F around December 27.
The widest day
August 13 carries the biggest normal gap between afternoon and dawn, 22°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Mt Vernon.
Where Mt Vernon Stands Nationally
Days and nights track unusually close together; the widest normal swing, about 22°F, is narrower than most stations record.
Mt Vernon earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall
Frost Dates & Growing Season
First Fall Freeze
November 3
50% probability date
Last Spring Freeze
March 24
50% probability date
Growing Season
224 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
4,986
Higher = more heating needed
Cooling Degree Days
64
Higher = more cooling needed
Warmest Month
August
Coldest Month
December
Nationwide similar cities
Other rankable U.S. places outside WA closest to Mt Vernon on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (52°F here).
- Baileyville, KS 52°F · 0.0°F off
- Bluefield, WV 52°F · 0.0°F off
- Caldwell, OH 52°F · 0.0°F off
- Emmett, ID 52°F · 0.0°F off
Data-derived climate profile
How Mt Vernon's climate pattern fits together
heating led · low swing
Heating is the larger measured load in Mt Vernon, at 4,986 degree days versus 64 for cooling. Unlike a strongly continental record, however, its 23.5°F month-to-month range is compact; persistent cool-season demand matters more than a dramatic summer-to-winter reversal.
Mt Vernon's frost-free season lasts about 224 days, a middle-length window whose endpoints matter more than the annual average. It describes freeze probability, not year-specific planting conditions.
Temperature varies within a narrow 23.5°F band across the normal year. August and December mark the typical warm and cold ends of the calendar. The annual average is 52°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
A moisture-range label is withheld because Mt Vernon's annual precipitation total is unavailable. Monthly source values remain visible where NOAA provides them, and no annual amount is reconstructed from incomplete data.
These labels group NOAA 1991-2020 normals from Mt Vernon's primary station, so the winter figures are a thirty-year average and not a floor: a single hard season can run well below them. Treat each band as a descriptive range for Mt Vernon, not an official NOAA class or a year-ahead forecast.
Questions about Mt Vernon's climate
How much energy does heating and cooling require in Mt Vernon? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Mt Vernon's primary station: MT VERNON 3 WNW (USC00455678). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Mt Vernon; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Mt Vernon comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.