Moro, Oregon climate: Normal weather by month, frost dates and records
Moro's normal year runs from 24°F December nights to 84°F July afternoons, with 11.0 inches of precipitation and 17 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 9.4°C, December lows of −4°C, July highs of 29°C, 280 mm of precipitation a year.
- NOAA stationMoro
- Station IDUSC00355734
- Location45.48°N 120.72°W
- Elevation1,870 ft (570 m)
- Population392
On October 23, the normal high in Moro is 59°F and the normal low 34°F, and the chance of measurable rain or snow is 30%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Moro.
- Jan 40° 25°
- Feb 45° 26°
- Mar 52° 30°
- Apr 59° 35°
- May 67° 42°
- Jun 74° 47°
- Jul 84° 53°
- Aug 84° 53°
- Sep 76° 45°
- Oct 62° 36°
- Nov 48° 29°
- Dec 40° 24°
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 Moro each month?
July is the warmest month, with normal highs of 84°F; December the coldest, with normal lows of 24°F. The most precipitation falls in December (1.61 in), the least in July (0.18 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 40°F | 25°F | 32.3°F | 1.47 | 5.3 | 11 | <1 | 25 | 9 h |
| February | 45°F | 26°F | 35.5°F | 1.06 | 2.5 | 9 | <1 | 21 | 10 h 20 min |
| March | 52°F | 30°F | 41.2°F | 0.97 | 0.7 | 10 | <1 | 17 | 11 h 50 min |
| April | 59°F | 35°F | 46.7°F | 0.96 | 0.0 | 9 | <1 | 9 | 13 h 30 min |
| May | 67°F | 42°F | 54.5°F | 0.96 | 0.0 | 8 | <1 | 2 | 14 h 50 min |
| June | 74°F | 47°F | 60.7°F | 0.57 | 0.0 | 5 | 2 | <1 | 15 h 40 min |
| July | 84°F | 53°F | 68.5°F | 0.18 | 0.0 | 2 | 9 | <1 | 15 h 20 min |
| August | 84°F | 53°F | 68.2°F | 0.20 | 0.0 | 2 | 9 | <1 | 14 h 10 min |
| September | 76°F | 45°F | 60.6°F | 0.43 | 0.0 | 3 | 2 | 1 | 12 h 40 min |
| October | 62°F | 36°F | 49.2°F | 1.06 | 0.2 | 8 | <1 | 8 | 11 h |
| November | 48°F | 29°F | 38.5°F | 1.54 | 2.2 | 12 | <1 | 18 | 9 h 30 min |
| December | 40°F | 24°F | 31.8°F | 1.61 | 5.7 | 12 | <1 | 26 | 8 h 40 min |
| Year (annual) | 61°F | 37°F | 49.0°F | 11.01 | 16.6 | 90 | 22 | 126 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 5°C | −4°C | 0.2°C | 37 mm | 13 cm |
| February | 7°C | −3°C | 1.9°C | 27 mm | 6 cm |
| March | 11°C | −1°C | 5.1°C | 25 mm | 2 cm |
| April | 15°C | 1°C | 8.2°C | 24 mm | 0 cm |
| May | 20°C | 5°C | 12.5°C | 24 mm | 0 cm |
| June | 24°C | 8°C | 15.9°C | 14 mm | 0 cm |
| July | 29°C | 12°C | 20.3°C | 5 mm | 0 cm |
| August | 29°C | 11°C | 20.1°C | 5 mm | 0 cm |
| September | 24°C | 7°C | 15.9°C | 11 mm | 0 cm |
| October | 17°C | 2°C | 9.6°C | 27 mm | 1 cm |
| November | 9°C | −2°C | 3.6°C | 39 mm | 6 cm |
| December | 4°C | −4°C | −0.1°C | 41 mm | 14 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00355734; 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 Moro?
Normal highs sit between 65°F and 85°F in May, June, July, August and September. Of those, August has the fewest days with rain (2).
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 USC00355734.
When is the last frost in Moro?
In Moro, the last spring frost (32°F) comes after May 12 in half of years and after May 31 in one year in ten; the first autumn frost comes before October 4 in half of years and before September 16 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
- May 121 year in 10 after May 31; 9 in 10 after April 27
- First autumn frost, half of years before
- October 41 year in 10 before September 16; 9 in 10 before October 18
NOAA puts the median frost-free season at 143 days, and the season without a hard freeze (28°F) at 173 days.
A hard freeze (28°F) comes after April 26 in half of springs and before October 16 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Moro in zone 7a in ZIP code 97039, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Moro's NOAA station is in zone 7a: the coldest night of a typical year reaches 3°F (26 complete years).
Frost dates for every NOAA station in Oregon · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00355734; 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 Moro?
In a normal year in Moro, 22 days a year reach 90°F (2 of them 100°F or more), 126 nights fall to 32°F or colder and 90 days bring measurable precipitation.
- Days at 90°F or more
- 22a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 126a normal year
- Days that stay below freezing
- 18high of 32°F or less
- Days with 0.01 inch of precipitation
- 90a normal year
- Days with 1 inch of snow or more
- 8a normal year
The highest temperature in this station's record (since 1898) is 113°F, on June 30, 2021; the lowest is −22°F, on January 27, 1957.
The wettest calendar year on that record is 1995, with 18.69 in; the snowiest season is 1949–50, with 68.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00355734; records: ACIS (NOAA Regional Climate Centers), station USC00355734. Records use complete months only; a month missing more than three days is left out.
How sunny is Moro?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Moro, 4.2 kWh per square metre a day. July is the sunniest month (93%) and December the cloudiest (56%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 57% | 1.3 |
| February | 66% | 2.3 |
| March | 68% | 3.5 |
| April | 75% | 5.1 |
| May | 78% | 6.3 |
| June | 83% | 7.1 |
| July | 93% | 7.7 |
| August | 91% | 6.5 |
| September | 86% | 4.8 |
| October | 76% | 3.0 |
| November | 64% | 1.6 |
| December | 56% | 1.1 |
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 Moro need?
A normal year in Moro brings 6,219 heating degree days, 16% more than the median U.S. place (5,373), and 401 cooling degree days, 56% fewer than the median (908). Eight months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 2,088 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,014 | 0 |
| February | 825 | 0 |
| March | 738 | 0 |
| April | 551 | 0 |
| May | 336 | 10 |
| June | 173 | 42 |
| July | 50 | 158 |
| August | 49 | 148 |
| September | 172 | 40 |
| October | 491 | 1 |
| November | 794 | 0 |
| December | 1,028 | 0 |
| Year (annual) | 6,219 | 401 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00355734. 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 Moro been warmer than normal lately?
2022 averaged 49.6°F, 0.6°F above the 1991-2020 normal of 49.0°F. 2 of the 2 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. | Snow |
|---|---|---|---|---|
| 2021 | 51.3°F | +2.3°F | 8.48 | – |
| 2022 | 49.6°F | +0.6°F | 14.00 | – |
Over 90 complete years from 1917 to 2022, the station's annual mean temperature rose at a fitted 2.0°F per century (+0.11°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00355734; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Moro's climate compare?
Moro is warmer than 25 of the other 104 places with their own NOAA record in Oregon, and wetter than 12. Across the 7,247 U.S. stations with normals, its annual mean of 49.0°F is warmer than 36%.
In the Köppen classification computed from these normals, Moro is Dsb: continental, 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 Moro share this climate record?
2 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.
- Grass Valley, OR166 people · 9 mi S
- Maryhill, WA39 people · 15 mi N
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 Moro's climate
What is the coldest month in Moro?
December, with a normal high of 40°F and a normal low of 24°F. The warmest is July (84°F by day, 53°F at night).
Does it snow in Moro?
Yes: 17 inches in a normal year, falling on 11 days with 0.1 inch or more, the most in December (5.7 inches).
What is the rainiest month in Moro?
December, with 1.61 in of precipitation in a normal year; the driest is July with 0.18 in.
What plant hardiness zone is Moro in?
The USDA's 2023 map puts Moro in zone 7a in ZIP code 97039, the nearest ZIP area. By the same method at Moro's NOAA station, the coldest night of a typical year reaches 3°F (26 years, 1991-2020): zone 7a.
How late can frost come in Moro?
In half of years the last 32°F night comes after May 12; in one year in ten it comes after May 31. Waiting until May 31 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Kent, OR20 miles from this station, 49.4°F a year
- Dufur, OR20 miles from this station, 50.5°F a year
- Goldendale, WA23 miles from this station, 48.0°F a year
- The Dalles Municipal Airport, WA24 miles from this station, 54.4°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made