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Climate and Average Weather Year Round in North Spearfish South Dakota, United States

In North Spearfish, the summers are short, warm, and mostly clear and the winters are long, freezing, dry, windy, and partly cloudy. Over the course of the year, the temperature typically varies from 18°F to 86°F and is rarely below -3°F or above 96°F.

Based on the tourism score, the best time of year to visit North Spearfish for warm-weather activities is from late June to late August.

Climate in North Spearfish

very coldcoldcoolwarmhotwarmcoolcoldvery coldJanFebMarAprMayJunJulAugSepOctNovDecNowNow76%76%46%46%clearovercastprecipitation: 2.6 inprecipitation: 2.6 in0.1 in0.1 inmuggy: 3%muggy: 3%0%0%drydrytourism score: 7.1tourism score: 7.10.10.1
North Spearfish weather by month. Click on each chart for more information.

Average Temperature in North Spearfish

The hot season lasts for 2.8 months, from June 16 to September 10, with an average daily high temperature above 76°F. The hottest day of the year is July 27, with an average high of 86°F and low of 60°F.

The cold season lasts for 3.9 months, from November 16 to March 14, with an average daily high temperature below 46°F. The coldest day of the year is January 1, with an average low of 18°F and high of 37°F.

Average High and Low Temperature in North Spearfish

Average High and Low Temperature in North SpearfishhotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec-10°F-10°F0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 137°FJan 137°FJul 2786°FJul 2786°F18°F18°F60°F60°FJun 1676°FJun 1676°FSep 1076°FSep 1076°FNov 1646°FNov 1646°FMar 1446°FMar 1446°F53°F53°F51°F51°F27°F27°F26°F26°FNowNow
The daily average high (red line) and low (blue line) temperature, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day.

Average Hourly Temperature in North Spearfish

Average Hourly Temperature in North SpearfishJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingfreezingfreezingfreezingvery coldvery coldcoldcoldcoolcomfortablewarmcomfortable
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.

Haymana, Turkey (6,041 miles away) and Basqal, Azerbaijan (6,307 miles) are the far-away foreign places with temperatures most similar to North Spearfish (view comparison).

Compare North Spearfish to another city:

Clouds

In North Spearfish, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year.

The clearer part of the year in North Spearfish begins around June 8 and lasts for 4.1 months, ending around October 10. On July 24, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 76% of the time, and overcast or mostly cloudy 24% of the time.

The cloudier part of the year begins around October 10 and lasts for 7.9 months, ending around June 8. On March 15, the cloudiest day of the year, the sky is overcast or mostly cloudy 54% of the time, and clear, mostly clear, or partly cloudy 46% of the time.

Cloud Cover Categories in North Spearfish

Cloud Cover Categories in North SpearfishclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Jul 2476%Jul 2476%Mar 1546%Mar 1546%Jun 860%Jun 860%Oct 1061%Oct 1061%NowNowclearmostly clearpartly cloudymostly cloudyovercast
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in North Spearfish varies significantly throughout the year.

The wetter season lasts 4.2 months, from April 13 to August 18, with a greater than 19% chance of a given day being a wet day. The chance of a wet day peaks at 36% on June 6.

The drier season lasts 7.8 months, from August 18 to April 13. The smallest chance of a wet day is 3% on January 28.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation in North Spearfish changes throughout the year.

Rain alone is the most common for 8.5 months, from February 1 to February 10 and from March 11 to November 17. The highest chance of a day with rain alone is 36% on June 6.

Snow alone is the most common for 3.4 months, from February 10 to March 11 and from November 17 to February 1. The highest chance of a day with snow alone is 3% on March 5.

Daily Chance of Precipitation in North Spearfish

Daily Chance of Precipitation in North SpearfishsnowsnowrainsnowJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Jun 636%Jun 636%Jan 283%Jan 283%Mar 119%Mar 119%Nov 176%Nov 176%Jan 15%Jan 15%Apr 1319%Apr 1319%Aug 1819%Aug 1819%NowNowrainsnowmixed
The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. North Spearfish experiences significant seasonal variation in monthly rainfall.

The rainy period of the year lasts for 7.3 months, from March 25 to November 3, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around May 26, with an average total accumulation of 2.5 inches.

The rainless period of the year lasts for 4.7 months, from November 3 to March 25. The least rain falls around January 18, with an average total accumulation of 0.1 inches.

Average Monthly Rainfall in North Spearfish

The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average liquid-equivalent snowfall.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. North Spearfish experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 6.6 months, from October 25 to May 12, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around March 30, with an average total liquid-equivalent accumulation of 0.3 inches.

The snowless period of the year lasts for 5.4 months, from May 12 to October 25. The least snow falls around July 20, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall in North Spearfish

Average Liquid-Equivalent Monthly Snowfall in North SpearfishsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 inMar 300.3 inMar 300.3 inJul 200.0 inJul 200.0 inNov 270.2 inNov 270.2 inMay 120.1 inMay 120.1 inNowNow
The average liquid-equivalent snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.

Sun

The length of the day in North Spearfish varies significantly over the course of the year. In 2021, the shortest day is December 21, with 8 hours, 50 minutes of daylight; the longest day is June 20, with 15 hours, 33 minutes of daylight.

Hours of Daylight and Twilight in North Spearfish

Hours of Daylight and Twilight in North SpearfishJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2015 hr, 33 minJun 2015 hr, 33 minJun 2012 hr, 9 minSep 2212 hr, 9 minSep 228 hr, 50 minDec 218 hr, 50 minDec 21nightnightdayNowNow
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.

The earliest sunrise is at 5:10 AM on June 15, and the latest sunrise is 2 hours, 30 minutes later at 7:40 AM on November 6. The earliest sunset is at 4:15 PM on December 9, and the latest sunset is 4 hours, 29 minutes later at 8:44 PM on June 26.

Daylight saving time (DST) is observed in North Spearfish during 2021, starting in the spring on March 14, lasting 7.8 months, and ending in the fall on November 7.

Sunrise & Sunset with Twilight and Daylight Saving Time in North Spearfish

Sunrise & Sunset with Twilight and Daylight Saving Time in North SpearfishJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 155:10 AMJun 155:10 AM8:44 PMJun 268:44 PMJun 26Dec 94:15 PMDec 94:15 PM7:40 AMNov 67:40 AMNov 6Mar 14DSTMar 14DSTDSTNov 7DSTNov 7daynightnightnightnightSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of the year 2021. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.

Moon

The figure below presents a compact representation of key lunar data for 2021. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.

Moon Rise, Set & Phases in North Spearfish

The time in which the moon is above the horizon (light blue area), with new moons (dark gray lines) and full moons (blue lines) indicated. The shaded overlays indicate night and civil twilight.

Humidity

We base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night.

The perceived humidity level in North Spearfish, as measured by the percentage of time in which the humidity comfort level is muggy, oppressive, or miserable, does not vary significantly over the course of the year, staying within 1% of 1% throughout.

Humidity Comfort Levels in North Spearfish

Humidity Comfort Levels in North SpearfishJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Nov 150%Nov 150%Jul 223%Jul 223%NowNowcomfortablecomfortabledrydryhumidhumid
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The percentage of time spent at various humidity comfort levels, categorized by dew point.

Wind

This section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages.

The average hourly wind speed in North Spearfish experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 7.5 months, from October 3 to May 20, with average wind speeds of more than 8.5 miles per hour. The windiest day of the year is January 17, with an average hourly wind speed of 10.1 miles per hour.

The calmer time of year lasts for 4.5 months, from May 20 to October 3. The calmest day of the year is July 30, with an average hourly wind speed of 7.0 miles per hour.

Average Wind Speed in North Spearfish

Average Wind Speed in North SpearfishwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mph14 mph14 mph16 mph16 mphJan 1710.1 mphJan 1710.1 mphJul 307.0 mphJul 307.0 mphOct 38.5 mphOct 38.5 mphMay 208.5 mphMay 208.5 mphNowNow
The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in North Spearfish varies throughout the year.

The wind is most often from the south for 3.6 months, from May 22 to September 10, with a peak percentage of 36% on August 21. The wind is most often from the west for 8.4 months, from September 10 to May 22, with a peak percentage of 66% on January 1.

Wind Direction in North Spearfish

Wind Direction in North SpearfishWSWJanFebMarAprMayJunJulAugSepOctNovDec0%100%20%80%40%60%60%40%80%20%100%0%NowNowwestsouthnortheast
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).

Best Time of Year to Visit

To characterize how pleasant the weather is in North Spearfish throughout the year, we compute two travel scores.

The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit North Spearfish for general outdoor tourist activities is from late June to late August, with a peak score in the last week of July.

Tourism Score in North Spearfish

Tourism Score in North Spearfishbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810107.17.10.10.1NowNowprecipitationprecipitationcloudscloudstemperaturetemperature tourism score
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit North Spearfish for hot-weather activities is from early July to mid August, with a peak score in the last week of July.

Beach/Pool Score in North Spearfish

Beach/Pool Score in North Spearfishbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810104.94.90.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperature beach/pool score
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).

Methodology

For each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed.

Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies.

Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more.

Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter.

Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter.

Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).

The growing season in North Spearfish typically lasts for 5.0 months (153 days), from around May 6 to around October 6, rarely starting before April 15 or after May 25, and rarely ending before September 13 or after October 27.

Time Spent in Various Temperature Bands and the Growing Season in North Spearfish

Time Spent in Various Temperature Bands and the Growing Season in North Spearfishgrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%May 650%May 650%Oct 650%Oct 650%May 2590%May 2590%Sep 1390%Sep 1390%Apr 1510%Apr 1510%Oct 2710%Oct 2710%Jul 20100%Jul 20100%NowNowfrigidfreezingvery coldcoldcoolcomfortablewarmhot
frigid 15°F freezing 32°F very cold 45°F cold 55°F cool 65°F comfortable 75°F warm 85°F hot 95°F sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.

Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.

Based on growing degree days alone, the first spring blooms in North Spearfish should appear around April 16, only rarely appearing before March 30 or after May 4.

Growing Degree Days in North Spearfish

Growing Degree Days in North SpearfishJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°FApr 1689°FApr 1689°FJul 6900°FJul 6900°FAug 171,800°FAug 171,800°FDec 312,569°FDec 312,569°FNowNow
The average growing degree days accumulated over the course of the year, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation.

The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year.

The brighter period of the year lasts for 3.2 months, from May 11 to August 17, with an average daily incident shortwave energy per square meter above 6.6 kWh. The brightest day of the year is July 3, with an average of 7.8 kWh.

The darker period of the year lasts for 3.5 months, from October 29 to February 13, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest day of the year is December 25, with an average of 1.7 kWh.

Average Daily Incident Shortwave Solar Energy in North Spearfish

Average Daily Incident Shortwave Solar Energy in North SpearfishbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWh10 kWh10 kWhJul 37.8 kWhJul 37.8 kWhDec 251.7 kWhDec 251.7 kWhMay 116.6 kWhMay 116.6 kWhAug 176.6 kWhAug 176.6 kWhOct 292.9 kWhOct 292.9 kWhFeb 132.9 kWhFeb 132.9 kWhNowNow
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of North Spearfish are 44.512 deg latitude, -103.894 deg longitude, and 3,606 ft elevation.

The topography within 2 miles of North Spearfish contains very significant variations in elevation, with a maximum elevation change of 833 feet and an average elevation above sea level of 3,648 feet. Within 10 miles contains very significant variations in elevation (2,966 feet). Within 50 miles contains large variations in elevation (4,820 feet).

The area within 2 miles of North Spearfish is covered by grassland (74%) and cropland (16%), within 10 miles by grassland (58%) and trees (28%), and within 50 miles by grassland (57%) and trees (22%).

Data Sources

This report illustrates the typical weather in North Spearfish, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in North Spearfish.

For each station, the records are corrected for the elevation difference between that station and North Spearfish according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations.

The estimated value at North Spearfish is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between North Spearfish and a given station.

The stations contributing to this reconstruction are: Black Hills Airport (KSPF, 94%, 9 kilometers, east); Buffalo (K2WX, 3.3%, 125 kilometers, north); and Gillette-Campbell County Airport (KGCC, 3.0%, 132 kilometers, west).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus.

All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.

Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.

Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.

Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .

Time zones for airports and weather stations are provided by AskGeo.com .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.

Disclaimer

The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.

We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.

We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.