Nyssa, Oregon climate: Normal weather by month, frost dates and records
Nyssa's normal year runs from 24°F January nights to 91°F July afternoons, with 10.2 inches of precipitation and 8 inches of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 11.0°C, January lows of −4°C, July highs of 33°C, 258 mm of precipitation a year.
- NOAA stationNyssa
- Station IDUSC00356179
- Location43.88°N 116.99°W
- Elevation2,175 ft (663 m)
- Population3,269
On October 22, the normal high in Nyssa is 61°F and the normal low 35°F, and the chance of measurable rain or snow is 17%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Nyssa.
- Jan 35° 24°
- Feb 44° 27°
- Mar 55° 34°
- Apr 63° 39°
- May 72° 48°
- Jun 81° 55°
- Jul 91° 62°
- Aug 89° 59°
- Sep 79° 49°
- Oct 64° 38°
- Nov 47° 30°
- Dec 36° 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 Nyssa each month?
July is the warmest month, with normal highs of 91°F; January the coldest, with normal lows of 24°F. The most precipitation falls in December (1.42 in), the least in August (0.16 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 35°F | 24°F | 29.8°F | 1.38 | 3.3 | 8 | <1 | 28 | 9 h 10 min |
| February | 44°F | 27°F | 35.8°F | 0.79 | 1.2 | 6 | <1 | 23 | 10 h 30 min |
| March | 55°F | 34°F | 44.3°F | 0.92 | 0.2 | 8 | <1 | 15 | 11 h 50 min |
| April | 63°F | 39°F | 50.7°F | 0.99 | 0.0 | 7 | <1 | 6 | 13 h 20 min |
| May | 72°F | 48°F | 59.9°F | 1.15 | 0.0 | 7 | 2 | 1 | 14 h 40 min |
| June | 81°F | 55°F | 67.5°F | 0.72 | 0.0 | 5 | 7 | <1 | 15 h 30 min |
| July | 91°F | 62°F | 76.6°F | 0.25 | 0.0 | 2 | 22 | <1 | 15 h 10 min |
| August | 89°F | 59°F | 74.1°F | 0.16 | 0.0 | 1 | 21 | <1 | 14 h |
| September | 79°F | 49°F | 64.0°F | 0.54 | 0.0 | 3 | 5 | <1 | 12 h 40 min |
| October | 64°F | 38°F | 50.9°F | 0.81 | 0.0 | 5 | <1 | 8 | 11 h 10 min |
| November | 47°F | 30°F | 38.1°F | 1.02 | 0.8 | 8 | <1 | 20 | 9 h 40 min |
| December | 36°F | 24°F | 30.2°F | 1.42 | 2.8 | 9 | <1 | 26 | 9 h |
| Year (annual) | 63°F | 41°F | 51.8°F | 10.15 | 8.3 | 68 | 56 | 128 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 2°C | −4°C | −1.2°C | 35 mm | 8 cm |
| February | 7°C | −3°C | 2.1°C | 20 mm | 3 cm |
| March | 13°C | 1°C | 6.8°C | 23 mm | 1 cm |
| April | 17°C | 4°C | 10.4°C | 25 mm | 0 cm |
| May | 22°C | 9°C | 15.5°C | 29 mm | 0 cm |
| June | 27°C | 13°C | 19.7°C | 18 mm | 0 cm |
| July | 33°C | 17°C | 24.8°C | 6 mm | 0 cm |
| August | 32°C | 15°C | 23.4°C | 4 mm | 0 cm |
| September | 26°C | 10°C | 17.8°C | 14 mm | 0 cm |
| October | 18°C | 3°C | 10.5°C | 21 mm | 0 cm |
| November | 8°C | −1°C | 3.4°C | 26 mm | 2 cm |
| December | 2°C | −4°C | −1.0°C | 36 mm | 7 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00356179; 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 Nyssa?
Normal highs sit between 65°F and 85°F in May, June and September. Of those, September has the fewest days with rain (3).
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 USC00356179.
When is the last frost in Nyssa?
In Nyssa, the last spring frost (32°F) comes after April 18 in half of years and after May 4 in one year in ten; the first autumn frost comes before October 18 in half of years and before October 4 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
- April 181 year in 10 after May 4; 9 in 10 after March 30
- First autumn frost, half of years before
- October 181 year in 10 before October 4; 9 in 10 before November 1
NOAA puts the median frost-free season at 182 days, and the season without a hard freeze (28°F) at 210 days.
A hard freeze (28°F) comes after March 31 in half of springs and before October 28 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Nyssa in zone 7a in ZIP code 83660, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Nyssa's NOAA station is in zone 7a: the coldest night of a typical year reaches 4°F (20 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 USC00356179; 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 Nyssa?
In a normal year in Nyssa, 56 days a year reach 90°F (8 of them 100°F or more), 128 nights fall to 32°F or colder and 68 days bring measurable precipitation.
- Days at 90°F or more
- 56a normal year
- Days at 100°F or more
- 8a normal year
- Nights at 32°F or colder
- 128a normal year
- Days that stay below freezing
- 20high of 32°F or less
- Days with 0.01 inch of precipitation
- 68a normal year
- Days with 1 inch of snow or more
- 5a normal year
The highest temperature in this station's record (since 1937) is 109°F, on July 13, 2002; the lowest is −19°F, on January 24, 1962.
The wettest calendar year on that record is 1983, with 16.22 in; the snowiest season is 1992–93, with 40.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00356179; records: ACIS (NOAA Regional Climate Centers), station USC00356179. Records use complete months only; a month missing more than three days is left out.
How sunny is Nyssa?
Over a year 82% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Nyssa, 4.6 kWh per square metre a day. July is the sunniest month (92%) and December the cloudiest (62%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 64% | 1.7 |
| February | 70% | 2.7 |
| March | 72% | 4.0 |
| April | 77% | 5.5 |
| May | 81% | 6.7 |
| June | 86% | 7.5 |
| July | 92% | 7.7 |
| August | 92% | 6.7 |
| September | 89% | 5.2 |
| October | 82% | 3.5 |
| November | 71% | 2.1 |
| December | 62% | 1.4 |
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 Nyssa need?
A normal year in Nyssa brings 5,666 heating degree days, 5% more than the median U.S. place (5,373), and 894 cooling degree days, 1% 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 3,050 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,091 | 0 |
| February | 818 | 0 |
| March | 642 | 0 |
| April | 432 | 1 |
| May | 193 | 35 |
| June | 57 | 132 |
| July | 4 | 364 |
| August | 9 | 292 |
| September | 97 | 68 |
| October | 437 | 1 |
| November | 808 | 0 |
| December | 1,079 | 0 |
| Year (annual) | 5,666 | 894 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00356179. 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 Nyssa been warmer than normal lately?
Over 54 complete years from 1939 to 2016, the station's annual mean temperature rose at a fitted 2.4°F per century (+0.14°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 Nyssa's climate compare?
Nyssa is warmer than 51 of the other 104 places with their own NOAA record in Oregon, and wetter than 7. Across the 7,247 U.S. stations with normals, its annual mean of 51.8°F is warmer than 49%.
In the Köppen classification computed from these normals, Nyssa is BSk: cold semi-arid steppe. 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 Nyssa 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.
- Notus, ID606 people · 14 mi SE
- Letha, ID566 people · 17 mi E
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 Nyssa's climate
What is the coldest month in Nyssa?
January, with a normal high of 35°F and a normal low of 24°F. The warmest is July (91°F by day, 62°F at night).
Does it snow in Nyssa?
Yes: 8 inches in a normal year, falling on 8 days with 0.1 inch or more, the most in January (3.3 inches).
What is the rainiest month in Nyssa?
December, with 1.42 in of precipitation in a normal year; the driest is August with 0.16 in.
What plant hardiness zone is Nyssa in?
The USDA's 2023 map puts Nyssa in zone 7a in ZIP code 83660, the nearest ZIP area. By the same method at Nyssa's NOAA station, the coldest night of a typical year reaches 4°F (20 years, 1991-2020): zone 7a.
How late can frost come in Nyssa?
In half of years the last 32°F night comes after April 18; in one year in ten it comes after May 4. Waiting until May 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Oregon climateThe statewide normals and every place in the state
- Parma, ID6 miles from this station, 51.5°F a year
- Malheur Branch Experiment Station, OR7 miles from this station, 52.2°F a year
- Ontario, OR10 miles from this station, 53.7°F a year
- Payette, ID14 miles from this station, 53.2°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made