Blaine, Washington climate: Normal weather by month, frost dates and records
Blaine's normal year runs from 34°F December nights to 73°F July afternoons, with 41.8 inches of precipitation and 9 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 10.5°C, December lows of 1°C, July highs of 23°C, 1,062 mm of precipitation a year.
- NOAA stationBlaine
- Station IDUSC00450729
- Location48.98°N 122.79°W
- Elevation60 ft (18 m)
- Population6,371
On October 23, the normal high in Blaine is 55°F and the normal low 42°F, and the chance of measurable rain or snow is 54%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Blaine.
- Jan 45° 34°
- Feb 48° 35°
- Mar 52° 38°
- Apr 58° 42°
- May 64° 47°
- Jun 69° 52°
- Jul 73° 55°
- Aug 73° 55°
- Sep 67° 50°
- Oct 57° 44°
- Nov 50° 38°
- Dec 44° 34°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Blaine each month?
July is the warmest month, with normal highs of 73°F; December the coldest, with normal lows of 34°F. The most precipitation falls in January (6.17 in), the least in August (1.13 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 45°F | 34°F | 39.3°F | 6.17 | 3.7 | 19 | <1 | 12 | 8 h 40 min |
| February | 48°F | 35°F | 41.1°F | 3.37 | 0.8 | 15 | <1 | 11 | 10 h 10 min |
| March | 52°F | 38°F | 44.9°F | 4.21 | 1.0 | 18 | <1 | 7 | 11 h 50 min |
| April | 58°F | 42°F | 49.8°F | 2.97 | 0.0 | 15 | <1 | 2 | 13 h 40 min |
| May | 64°F | 47°F | 55.7°F | 2.57 | 0.0 | 11 | <1 | <1 | 15 h 10 min |
| June | 69°F | 52°F | 60.3°F | 1.93 | 0.0 | 10 | <1 | <1 | 16 h 10 min |
| July | 73°F | 55°F | 64.0°F | 1.14 | 0.0 | 6 | <1 | <1 | 15 h 50 min |
| August | 73°F | 55°F | 63.8°F | 1.13 | 0.0 | 6 | <1 | <1 | 14 h 30 min |
| September | 67°F | 50°F | 58.6°F | 2.22 | 0.0 | 9 | <1 | <1 | 12 h 40 min |
| October | 57°F | 44°F | 50.7°F | 4.39 | 0.1 | 16 | <1 | 1 | 10 h 50 min |
| November | 50°F | 38°F | 43.8°F | 6.08 | 0.4 | 19 | <1 | 7 | 9 h 10 min |
| December | 44°F | 34°F | 39.2°F | 5.63 | 3.3 | 19 | <1 | 13 | 8 h 20 min |
| Year (annual) | 58°F | 44°F | 50.9°F | 41.81 | 9.3 | 162 | <1 | 52 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 7°C | 1°C | 4.1°C | 157 mm | 9 cm |
| February | 9°C | 1°C | 5.1°C | 86 mm | 2 cm |
| March | 11°C | 3°C | 7.2°C | 107 mm | 3 cm |
| April | 14°C | 5°C | 9.9°C | 75 mm | 0 cm |
| May | 18°C | 8°C | 13.2°C | 65 mm | 0 cm |
| June | 20°C | 11°C | 15.7°C | 49 mm | 0 cm |
| July | 23°C | 13°C | 17.8°C | 29 mm | 0 cm |
| August | 23°C | 13°C | 17.7°C | 29 mm | 0 cm |
| September | 19°C | 10°C | 14.8°C | 56 mm | 0 cm |
| October | 14°C | 7°C | 10.4°C | 112 mm | 0 cm |
| November | 10°C | 3°C | 6.6°C | 154 mm | 1 cm |
| December | 7°C | 1°C | 4.0°C | 143 mm | 8 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00450729; 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.
When is the best weather to visit Blaine?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, July has the fewest days with rain (6).
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 USC00450729.
When is the last frost in Blaine?
In Blaine, the last spring frost (32°F) comes after March 31 in half of years and after April 22 in one year in ten; the first autumn frost comes before November 4 in half of years and before October 18 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
- March 311 year in 10 after April 22; 9 in 10 after March 8
- First autumn frost, half of years before
- November 41 year in 10 before October 18; 9 in 10 before November 24
NOAA puts the median frost-free season at 219 days, and the season without a hard freeze (28°F) at 257 days.
A hard freeze (28°F) comes after March 5 in half of springs and before November 19 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Blaine in zone 8b in ZIP code 98230. By the map's own method, the average of each year's coldest night over 1991-2020, Blaine's NOAA station is in zone 8b: the coldest night of a typical year reaches 16°F (25 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 USC00450729; 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 in Blaine?
In a normal year in Blaine, a 90°F day is rare, 52 nights fall to 32°F or colder and 162 days bring measurable precipitation.
- Days at 90°F or more
- fewer than 1a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 52a normal year
- Days that stay below freezing
- 5high of 32°F or less
- Days with 0.01 inch of precipitation
- 162a normal year
- Days with 1 inch of snow or more
- 3a normal year
The highest temperature in this station's record (since 1893) is 98°F, on June 29, 2021; the lowest is −9°F, on February 7, 1936.
The wettest calendar year on that record is 2020, with 58.03 in; the snowiest season is 1950–51, with 44.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00450729; records: ACIS (NOAA Regional Climate Centers), station USC00450729. Records use complete months only; a month missing more than three days is left out.
How sunny is Blaine?
Over a year 70% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Blaine, 3.5 kWh per square metre a day. July is the sunniest month (82%) and December the cloudiest (51%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 52% | 1.0 |
| February | 61% | 1.9 |
| March | 61% | 2.9 |
| April | 67% | 4.3 |
| May | 71% | 5.5 |
| June | 72% | 6.0 |
| July | 82% | 6.5 |
| August | 81% | 5.5 |
| September | 76% | 3.9 |
| October | 64% | 2.2 |
| November | 55% | 1.1 |
| December | 51% | 0.8 |
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 much heating and cooling does Blaine need?
A normal year in Blaine brings 5,186 heating degree days, 3% fewer than the median U.S. place (5,373), and 67 cooling degree days, 93% fewer 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 1,754 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 797 | 0 |
| February | 668 | 0 |
| March | 623 | 0 |
| April | 458 | 0 |
| May | 291 | 1 |
| June | 149 | 7 |
| July | 62 | 29 |
| August | 64 | 26 |
| September | 194 | 3 |
| October | 443 | 0 |
| November | 638 | 0 |
| December | 801 | 0 |
| Year (annual) | 5,186 | 67 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00450729. 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.
Has Blaine been warmer than normal lately?
Over 73 complete years from 1903 to 2020, the station's annual mean temperature rose at a fitted 2.4°F per century (+0.13°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Blaine's climate compare?
Blaine is warmer than 55 of the other 95 places with their own NOAA record in Washington, and wetter than 60. Across the 7,247 U.S. stations with normals, its annual mean of 50.9°F is warmer than 44%.
In the Köppen classification computed from these normals, Blaine is Csb: temperate, 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.
Which places near Blaine 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.
- Birch Bay, WA11,103 people · 4 mi SE
- Point Roberts, WA1,275 people · 12 mi W
- Custer, WA266 people · 8 mi SE
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 Blaine's climate
What is the coldest month in Blaine?
December, with a normal high of 44°F and a normal low of 34°F. The warmest is July (73°F by day, 55°F at night).
Does it snow in Blaine?
Yes: 9 inches in a normal year, falling on 3 days with 0.1 inch or more, the most in January (3.7 inches).
What is the rainiest month in Blaine?
January, with 6.17 in of precipitation in a normal year; the driest is August with 1.13 in.
What plant hardiness zone is Blaine in?
The USDA's 2023 map puts Blaine in zone 8b in ZIP code 98230. By the same method at Blaine's NOAA station, the coldest night of a typical year reaches 16°F (25 years, 1991-2020): zone 8b.
How late can frost come in Blaine?
In half of years the last 32°F night comes after March 31; in one year in ten it comes after April 22. Waiting until April 22 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Washington climateThe statewide normals and every place in the state
- Bellingham, WA17 miles from this station, 51.2°F a year
- Clearbrook, WA21 miles from this station, 50.3°F a year
- Olga (2 mi SE), WA25 miles from this station, 50.8°F a year
- Friday Harbor, WA33 miles from this station, 50.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made