Johnson Siding, South Dakota climate: Normal weather by month, frost dates and records
Johnson Siding's normal year runs from 12°F January nights to 83°F July afternoons, with 21.6 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 7.3°C, January lows of −11°C, July highs of 28°C, 548 mm of precipitation a year.
- NOAA stationJohnson Siding
- Station IDUSC00394343
- Location44.08°N 103.43°W
- Elevation4,184 ft (1,275 m)
- Population (census place)671
On October 23, the normal high in Johnson Siding is 56°F and the normal low 29°F, and the chance of measurable rain or snow is 18%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Johnson Siding.
- Jan 39° 12°
- Feb 39° 14°
- Mar 48° 21°
- Apr 55° 29°
- May 64° 39°
- Jun 75° 47°
- Jul 83° 54°
- Aug 81° 52°
- Sep 73° 43°
- Oct 59° 32°
- Nov 48° 21°
- Dec 40° 14°
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 Johnson Siding each month?
July is the warmest month, with normal highs of 83°F; January the coldest, with normal lows of 12°F. The most precipitation falls in May (4.21 in), the least in January (0.39 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 39°F | 12°F | 25.7°F | 0.39 | 4 | <1 | 31 | 9 h 10 min |
| February | 39°F | 14°F | 26.5°F | 0.52 | 5 | <1 | 28 | 10 h 30 min |
| March | 48°F | 21°F | 34.4°F | 0.91 | 6 | <1 | 28 | 11 h 50 min |
| April | 55°F | 29°F | 42.1°F | 2.42 | 9 | <1 | 20 | 13 h 20 min |
| May | 64°F | 39°F | 51.4°F | 4.21 | 9 | <1 | 7 | 14 h 40 min |
| June | 75°F | 47°F | 61.1°F | 3.56 | 9 | 2 | <1 | 15 h 30 min |
| July | 83°F | 54°F | 68.3°F | 3.48 | 8 | 8 | <1 | 15 h 10 min |
| August | 81°F | 52°F | 66.6°F | 2.14 | 7 | 5 | <1 | 14 h |
| September | 73°F | 43°F | 58.3°F | 1.37 | 6 | 1 | 3 | 12 h 40 min |
| October | 59°F | 32°F | 45.4°F | 1.57 | 6 | <1 | 16 | 11 h 10 min |
| November | 48°F | 21°F | 34.4°F | 0.56 | 3 | <1 | 27 | 9 h 40 min |
| December | 40°F | 14°F | 26.6°F | 0.45 | 3 | <1 | 31 | 8 h 50 min |
| Year (annual) | 59°F | 31°F | 45.1°F | 21.58 | 75 | 16 | 190 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 4°C | −11°C | −3.5°C | 10 mm |
| February | 4°C | −10°C | −3.1°C | 13 mm |
| March | 9°C | −6°C | 1.3°C | 23 mm |
| April | 13°C | −2°C | 5.6°C | 61 mm |
| May | 18°C | 4°C | 10.8°C | 107 mm |
| June | 24°C | 8°C | 16.2°C | 90 mm |
| July | 28°C | 12°C | 20.2°C | 88 mm |
| August | 27°C | 11°C | 19.2°C | 54 mm |
| September | 23°C | 6°C | 14.6°C | 35 mm |
| October | 15°C | 0°C | 7.4°C | 40 mm |
| November | 9°C | −6°C | 1.3°C | 14 mm |
| December | 4°C | −10°C | −3.0°C | 11 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Pactola Dam (3 miles away), gets 61 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00394343; 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 Johnson Siding?
Normal highs sit between 65°F and 85°F in June, July, August and September. Of those, September 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 USC00394343.
When is the last frost in Johnson Siding?
In Johnson Siding, the last spring frost (32°F) comes after May 20 in half of years and after June 3 in one year in ten; the first autumn frost comes before September 25 in half of years and before September 11 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 201 year in 10 after June 3; 9 in 10 after May 9
- First autumn frost, half of years before
- September 251 year in 10 before September 11; 9 in 10 before October 7
NOAA puts the median frost-free season at 126 days, and the season without a hard freeze (28°F) at 148 days.
A hard freeze (28°F) comes after May 8 in half of springs and before October 4 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Johnson Siding in zone 5a in ZIP code 57702, the nearest ZIP area.
Frost dates for every NOAA station in South Dakota · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00394343; 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 Johnson Siding?
In a normal year in Johnson Siding, 16 days a year reach 90°F (1 of them 100°F or more), 190 nights fall to 32°F or colder and 75 days bring measurable precipitation.
- Days at 90°F or more
- 16a normal year
- Days at 100°F or more
- 1a normal year
- Nights at 32°F or colder
- 190a normal year
- Days that stay below freezing
- 35high of 32°F or less
- Days with 0.01 inch of precipitation
- 75a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00394343.
How sunny is Johnson Siding?
Over a year 78% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Johnson Siding, 4.3 kWh per square metre a day. July is the sunniest month (86%) and April the cloudiest (71%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 1.9 |
| February | 76% | 2.9 |
| March | 74% | 4.0 |
| April | 71% | 5.0 |
| May | 72% | 5.9 |
| June | 80% | 6.8 |
| July | 86% | 7.0 |
| August | 86% | 6.0 |
| September | 82% | 4.7 |
| October | 75% | 3.1 |
| November | 75% | 2.1 |
| December | 72% | 1.6 |
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 Johnson Siding need?
A normal year in Johnson Siding brings 7,540 heating degree days, 40% more than the median U.S. place (5,373), and 301 cooling degree days, 67% 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 1,904 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 1,218 | 0 |
| February | 1,079 | 0 |
| March | 949 | 0 |
| April | 687 | 0 |
| May | 426 | 3 |
| June | 156 | 40 |
| July | 34 | 136 |
| August | 48 | 97 |
| September | 224 | 25 |
| October | 609 | 0 |
| November | 918 | 0 |
| December | 1,192 | 0 |
| Year (annual) | 7,540 | 301 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00394343. 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.
How does Johnson Siding's climate compare?
Johnson Siding is warmer than 39 of the other 99 places with their own NOAA record in South Dakota, and wetter than 40. Across the 7,247 U.S. stations with normals, its annual mean of 45.1°F is warmer than 20%.
In the Köppen classification computed from these normals, Johnson Siding is Dwb: continental, dry-winter, 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 Johnson Siding share this climate record?
5 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.
- Summerset, SD3,013 people · 9 mi NE
- Blackhawk, SD2,805 people · 7 mi NE
- Colonial Pine Hills, SD2,347 people · 8 mi SE
- Piedmont, SD1,002 people · 10 mi N
- Wonderland Homes, SD782 people · 9 mi NE
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 Johnson Siding's climate
What is the coldest month in Johnson Siding?
January, with a normal high of 39°F and a normal low of 12°F. The warmest is July (83°F by day, 54°F at night).
Does it snow in Johnson Siding?
Yes. NOAA publishes no 1991-2020 snowfall normal for Johnson Siding's NOAA station; the nearest record that keeps one, Pactola Dam (3 miles away), records 61 inches of snow in a normal year.
What is the rainiest month in Johnson Siding?
May, with 4.21 in of precipitation in a normal year; the driest is January with 0.39 in.
What plant hardiness zone is Johnson Siding in?
The USDA's 2023 map puts Johnson Siding in zone 5a in ZIP code 57702, the nearest ZIP area.
How late can frost come in Johnson Siding?
In half of years the last 32°F night comes after May 20; in one year in ten it comes after June 3. Waiting until June 3 leaves about a one-in-ten chance of a later frost.
Nearby and next
- South Dakota climateThe statewide normals and every place in the state
- Pactola Dam, SD3 miles from this station, 42.1°F a year
- Hill City, SD12 miles from this station, 43.9°F a year
- Mount Rushmore National Memorial, SD14 miles from this station, 45.7°F a year
- Rochford (2 mi WNW), SD16 miles from this station, 38.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made