Snow in Hillsboro, Oregon Winter storm alerts · 7-day snow forecast · average snowfall
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Hillsboro averages 2.7 inches of snow a year. The snowiest month is December (1.3″), and snow usually falls from October through February. On about 1 days a year at least an inch falls. Snow covers the ground (1″+) on roughly 1 days of an average winter.
Average snowfall by month
Month
Snowfall
Days 1″+
Days with snow cover
Freezing nights
Avg. low
October
0.2″
0
0
3
41°F
November
0″
0
0
9
37°F
December
1.3″
<1
<1
14
33°F
January
0.6″
<1
<1
13
34°F
February
0.6″
<1
<1
13
34°F
March
0″
0
0
9
37°F
April
0″
0
0
3
39°F
May
0″
0
0
1
45°F
Year
2.7″
1
1
64
NOAA NCEI U.S. Climate Normals 1991–2020 — snowfall at Forest Grove (5 mi from the city center, -13 ft elevation difference); temperatures at Portland-Hillsboro Airport. Averages smooth out big years: single winters can bring half or double the normal.
2.7 inches in an average year (NOAA U.S. Climate Normals 1991–2020, Forest Grove station, 5 miles away). The snowiest month is December with 1.3 inches.
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How many freezing nights does Hillsboro have?
About 64 nights a year drop to 32 °F or below (NOAA 1991–2020); the coldest month, December, averages a low of 33 °F.