Winona, Missouri climate: Normal weather by month, frost dates and records
Winona's normal year runs from 20°F January nights to 88°F July afternoons, with 50.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 12.2°C, January lows of −7°C, July highs of 31°C, 1,284 mm of precipitation a year.
- NOAA stationWinona (3 mi SW)
- Station IDUSC00239056
- Location36.98°N 91.38°W
- Elevation961 ft (293 m)
- Population988
On October 23, the normal high in Winona is 66°F and the normal low 38°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Winona.
- Jan 43° 20°
- Feb 48° 24°
- Mar 57° 31°
- Apr 67° 39°
- May 75° 50°
- Jun 83° 60°
- Jul 88° 64°
- Aug 87° 62°
- Sep 80° 53°
- Oct 69° 41°
- Nov 56° 31°
- Dec 46° 23°
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 Winona each month?
July is the warmest month, with normal highs of 88°F; January the coldest, with normal lows of 20°F. The most precipitation falls in May (6.57 in), the least in January (3.05 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 43°F | 20°F | 31.4°F | 3.05 | – | <1 | 27 | 9 h 50 min |
| February | 48°F | 24°F | 35.8°F | 3.07 | – | <1 | 23 | 10 h 50 min |
| March | 57°F | 31°F | 44.0°F | 4.73 | – | <1 | 17 | 11 h 50 min |
| April | 67°F | 39°F | 53.1°F | 5.30 | – | <1 | 8 | 13 h 10 min |
| May | 75°F | 50°F | 62.8°F | 6.57 | – | 1 | 1 | 14 h 10 min |
| June | 83°F | 60°F | 71.4°F | 3.99 | – | 5 | <1 | 14 h 40 min |
| July | 88°F | 64°F | 75.9°F | 4.31 | – | 16 | <1 | 14 h 30 min |
| August | 87°F | 62°F | 74.4°F | 3.81 | – | 10 | <1 | 13 h 40 min |
| September | 80°F | 53°F | 66.1°F | 4.07 | – | 4 | <1 | 12 h 30 min |
| October | 69°F | 41°F | 54.8°F | 3.69 | – | <1 | 7 | 11 h 20 min |
| November | 56°F | 31°F | 43.6°F | 4.58 | – | <1 | 19 | 10 h 10 min |
| December | 46°F | 23°F | 34.5°F | 3.37 | – | <1 | 24 | 9 h 40 min |
| Year (annual) | 67°F | 41°F | 54.0°F | 50.54 | – | 36 | 125 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 6°C | −7°C | −0.3°C | 77 mm |
| February | 9°C | −5°C | 2.1°C | 78 mm |
| March | 14°C | −1°C | 6.7°C | 120 mm |
| April | 19°C | 4°C | 11.7°C | 135 mm |
| May | 24°C | 10°C | 17.1°C | 167 mm |
| June | 28°C | 15°C | 21.9°C | 101 mm |
| July | 31°C | 18°C | 24.4°C | 109 mm |
| August | 31°C | 16°C | 23.6°C | 97 mm |
| September | 27°C | 11°C | 18.9°C | 103 mm |
| October | 20°C | 5°C | 12.7°C | 94 mm |
| November | 13°C | −1°C | 6.4°C | 116 mm |
| December | 8°C | −5°C | 1.4°C | 86 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Eminence (12 miles away), gets 6 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00239056; 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 Winona?
Normal highs sit between 65°F and 85°F in April, May, June, September and October.
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 USC00239056.
When is the last frost in Winona?
In Winona, the last spring frost (32°F) comes after April 22 in half of years and after May 6 in one year in ten; the first autumn frost comes before October 18 in half of years and before October 5 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 221 year in 10 after May 6; 9 in 10 after April 8
- First autumn frost, half of years before
- October 181 year in 10 before October 5; 9 in 10 before October 28
NOAA puts the median frost-free season at 176 days, and the season without a hard freeze (28°F) at 198 days.
A hard freeze (28°F) comes after April 10 in half of springs and before October 27 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Winona in zone 6b in ZIP code 65588, the nearest ZIP area.
Frost dates for every NOAA station in Missouri · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00239056; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. 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 Winona?
In a normal year in Winona, 36 days a year reach 90°F (2 of them 100°F or more) and 125 nights fall to 32°F or colder.
- Days at 90°F or more
- 36a normal year
- Days at 100°F or more
- 2a normal year
- Nights at 32°F or colder
- 125a normal year
- Days that stay below freezing
- 13high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00239056.
How sunny is Winona?
Over a year 76% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Winona, 4.4 kWh per square metre a day. July is the sunniest month (82%) and February the cloudiest (67%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 2.4 |
| February | 67% | 3.0 |
| March | 70% | 4.1 |
| April | 73% | 5.2 |
| May | 74% | 5.8 |
| June | 82% | 6.7 |
| July | 82% | 6.4 |
| August | 82% | 5.7 |
| September | 81% | 4.9 |
| October | 76% | 3.6 |
| November | 74% | 2.7 |
| December | 68% | 2.1 |
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 Winona need?
A normal year in Winona brings 5,029 heating degree days, 6% fewer than the median U.S. place (5,373), and 1,034 cooling degree days, 14% more 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 3,565 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,043 | 0 |
| February | 819 | 0 |
| March | 653 | 1 |
| April | 363 | 6 |
| May | 135 | 65 |
| June | 11 | 203 |
| July | 1 | 339 |
| August | 3 | 293 |
| September | 77 | 110 |
| October | 333 | 17 |
| November | 645 | 1 |
| December | 947 | 0 |
| Year (annual) | 5,029 | 1,034 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00239056. 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 Winona been warmer than normal lately?
2025 averaged 55.7°F, 1.7°F above the 1991-2020 normal of 54.0°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 54.3°F | +0.3°F | 51.70 |
| 2022 | 53.6°F | −0.4°F | 45.88 |
| 2023 | 55.3°F | +1.3°F | 41.50 |
| 2024 | 56.1°F | +2.1°F | 55.81 |
| 2025 | 55.7°F | +1.7°F | 54.05 |
Source: observed years: ACIS, station USC00239056. A year counts only with all twelve months complete.
How does Winona's climate compare?
Winona is warmer than 37 of the other 133 places with their own NOAA record in Missouri, and wetter than 119. Across the 7,247 U.S. stations with normals, its annual mean of 54.0°F is warmer than 57%.
In the Köppen classification computed from these normals, Winona is Dfa: continental, no dry season, hot 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 Winona 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 Tree, MO562 people · 6 mi W
- Fremont, MO103 people · 12 mi E
- Montier, MO89 people · 11 mi W
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 Winona's climate
What is the coldest month in Winona?
January, with a normal high of 43°F and a normal low of 20°F. The warmest is July (88°F by day, 64°F at night).
Does it snow in Winona?
Yes. NOAA publishes no 1991-2020 snowfall normal for Winona's NOAA station; the nearest record that keeps one, Eminence (12 miles away), records 6 inches of snow in a normal year.
What is the rainiest month in Winona?
May, with 6.57 in of precipitation in a normal year; the driest is January with 3.05 in.
What plant hardiness zone is Winona in?
The USDA's 2023 map puts Winona in zone 6b in ZIP code 65588, the nearest ZIP area.
How late can frost come in Winona?
In half of years the last 32°F night comes after April 22; in one year in ten it comes after May 6. Waiting until May 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Missouri climateThe statewide normals and every place in the state
- Eminence, MO12 miles from this station, 56.6°F a year
- Summersville, MO17 miles from this station, 56.0°F a year
- Round Spring (2 mi SW), MO19 miles from this station, 55.3°F a year
- Alton, MO20 miles from this station, 55.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made