Keystone, SD weather in June
June in Keystone: mild, with frequent rain. Highs 71°F, lows 45°F, rain on about 13 days.
- Normal high
- 71°F
- Normal low
- 45°F
- Wet days
- 13
- 3.5 in total
- Muggy days
- 0
- dew point 65°F+
How June changes from start to finish
| June 1 | June 30 | |
|---|---|---|
| Normal high | 66°F | 75°F |
| Normal low | 42°F | 48°F |
| Chance of a wet day | 45% | 41% |
| Sunrise / sunset | 5:14 am / 8:28 pm | 5:14 am / 8:40 pm |
| Daylight | 15.3 h | 15.4 h |
Chance of a wet day: average for the first and last 7 days of the month. Times are local clock time (Mountain Time).
A typical June day
- 6 am54°Fdew point 44°F
- 9 am63°Fdew point 44°F
- Noon67°Fdew point 44°F
- 3 pm68°Fdew point 44°F
- 6 pm64°Fdew point 44°F
- 9 pm56°Fdew point 45°F
NOAA hourly normals (local standard time) from Custer Co Airport (15 mi away); average wind 7 mph; clear or few clouds in 46% of daytime hours, mostly cloudy or overcast in 40%.
What kind of days to expect
- Comfortable dayshigh 65-80°F and dew point under 60°F16 of 30
- Hot dayshigh 90°F or more1 of 30
- Muggy daysdaily mean dew point 65°F or more0 of 30
- Wet daysat least 0.01 in of rain or melted snow13 of 30
- Notable rainat least 0.10 in8 of 30
- Freezing nightslow 32°F or below1 of 30
- Snow on the groundsnow depth 1 in or more0 of 30
Average days per June, counted from daily records for each year 1991-2020.
Rain and snow in June
Normal precipitation is 3.5 in; a dry June brings about 1.8 in and a wet one about 5.1 in (25th and 75th percentiles). About 2 days bring half an inch or more, and about 1 an inch or more. Normal snowfall is 0.2 in.
How June varies from year to year
- Warmest June, 1991-20202016: average high 79°F
- Coolest June1998: average high 64°F
- Wettest June2015: 8.1 in
- Driest June1994: 0.8 in
- Highest reading99°F (June 27, 2012)
- Lowest reading27°F (June 8, 2009)
From the station's daily records with NOAA quality flags removed; most recent date shown when a reading repeats.
June compared with May and July
| May | June | July | |
|---|---|---|---|
| Normal high | 60°F | 71°F | 79°F |
| Normal low | 36°F | 45°F | 51°F |
| Wet days | 13 | 13 | 12 |
| Comfortable days | 10 | 16 | 13 |
| Daylight | 14.8 h | 15.4 h | 15.1 h |
Highs change by +11°F from May and +8°F into July.
Nearby alternatives in June
- Warmer: Rapid City, SD16 mi · high 78°F · 13 wet days
- Drier: Casper, WY162 mi · high 80°F · 9 wet days
How Keystone ranks in June
- Normal high349th warmest of 378 cities; 4th of 4 in South Dakota
- Wet days343rd driest of 378
- Comfortable days46th most of 340
What to pack for Keystone in June
- Layers – afternoons near 71°F but nights near 45°F
- A rain jacket or umbrella – rain on about 13 days
Heating and cooling
June has 231 heating degree days and 18 cooling degree days (base 65°F), 3% of the year's total heating and cooling demand.
Questions
How hot is Keystone in June?
The normal high is 71°F and the normal low is 45°F. From 1991 to 2020 the hottest June reading was 99°F (most recently on June 27, 2012).
Does it rain a lot in Keystone in June?
About 13 days in June have at least 0.01 in of precipitation, and the normal total is 3.5 in. The wettest June in 1991-2020 was in 2015 (8.1 in); the driest was in 1994 (0.8 in).
Does it snow in Keystone in June?
Yes. Normal snowfall in June is 0.2 in.
Is June a good time to visit Keystone?
June ranks 1st of 12 months on our comfort score for Keystone (75 out of 100). It has about 16 comfortable days and about 1 day at 90°F or hotter. The best month is June.
Where the numbers come from
- Temperature, rain, snowfall, snow depth and frost dates: Pactola Dam (USC00396427), 12 mi NNW of the city center, 4,720 ft (385 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Humidity and wind by hour: Custer Co Airport (USW00094032), 15 mi SW of the city center, 5,545 ft (1,210 ft higher than the city). NOAA normals and daily records, 1991-2020.
- Cloud cover: Ellsworth AFB (USW00024006), 24 mi NE of the city center, 3,215 ft (1,120 ft lower than the city). NOAA normals and daily records, 1991-2020.
- Daily humidity and wind: Rapid City Regional Airport (726620-24090), 21 mi ENE of the city center, 3,162 ft (1,173 ft lower than the city). Hourly observations, 1991-2020.