Climate and Average Weather Year Round at Stevens Field United States

At Stevens Field, the summers are warm, dry, and partly cloudy and the winters are freezing, snowy, and mostly clear. Over the course of the year, the temperature typically varies from 13°F to 81°F and is rarely below -0°F or above 87°F.

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

The warm season lasts for 3.5 months, from May 30 to September 15, with an average daily high temperature above 72°F. The hottest month of the year at Stevens Field is July, with an average high of 81°F and low of 51°F.

The cold season lasts for 3.5 months, from November 19 to March 1, with an average daily high temperature below 46°F. The coldest month of the year at Stevens Field is January, with an average low of 14°F and high of 38°F.

At Stevens Field, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year at Stevens Field begins around August 30 and lasts for 2.2 months, ending around November 6.

The clearest month of the year at Stevens Field is September, during which on average the sky is clear, mostly clear, or partly cloudy 77% of the time.

The cloudier part of the year begins around November 6 and lasts for 9.7 months, ending around August 30.

The cloudiest month of the year at Stevens Field is February, during which on average the sky is overcast or mostly cloudy 40% of the time.

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

The wetter season lasts 2.7 months, from July 9 to September 30, with a greater than 20% chance of a given day being a wet day. The month with the most wet days at Stevens Field is August, with an average of 9.0 days with at least 0.04 inches of precipitation.

The drier season lasts 9.3 months, from September 30 to July 9. The month with the fewest wet days at Stevens Field is June, with an average of 2.9 days with at least 0.04 inches of precipitation.

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 at Stevens Field changes throughout the year.

Rain alone is the most common for 8.4 months, from March 14 to November 25. The month with the most days of rain alone at Stevens Field is August, with an average of 9.0 days.

Mixed snow and rain is the most common for 2.6 months, from January 13 to January 19, from February 3 to March 14, and from November 25 to December 28. The month with the most days of mixed snow and rain at Stevens Field is February, with an average of 2.1 days.

Snow alone is the most common for 1.0 months, from January 19 to February 3 and from December 28 to January 13. The month with the most days of snow alone at Stevens Field is January, with an average of 1.9 days.

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. Stevens Field experiences some seasonal variation in monthly rainfall.

The rainy period of the year lasts for 10 months, from February 13 to December 25, with a sliding 31-day rainfall of at least 0.5 inches. The month with the most rain at Stevens Field is September, with an average rainfall of 1.6 inches.

The rainless period of the year lasts for 1.6 months, from December 25 to February 13. The month with the least rain at Stevens Field is January, with an average rainfall of 0.4 inches.

Snowfall

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Stevens Field experiences significant seasonal variation in monthly snowfall.

The snowy period of the year lasts for 6.2 months, from October 19 to April 24, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Stevens Field is January, with an average snowfall of 5.7 inches.

The snowless period of the year lasts for 5.8 months, from April 24 to October 19. The least snow falls around July 30, with an average total accumulation of 0.0 inches.

The length of the day at Stevens Field varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 36 minutes of daylight; the longest day is June 20, with 14 hours, 44 minutes of daylight.

The earliest sunrise is at 5:47 AM on June 12, and the latest sunrise is 1 hour, 47 minutes later at 7:34 AM on November 2. The earliest sunset is at 4:50 PM on December 6, and the latest sunset is 3 hours, 42 minutes later at 8:32 PM on June 28.

Daylight saving time (DST) is observed at Stevens Field during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3.

The figure below presents a compact representation of key lunar data for 2024. 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.

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 at Stevens Field, 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, remaining a virtually constant 0% throughout.

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 at Stevens Field experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 4.3 months, from February 16 to June 26, with average wind speeds of more than 6.3 miles per hour. The windiest month of the year at Stevens Field is April, with an average hourly wind speed of 7.9 miles per hour.

The calmer time of year lasts for 7.7 months, from June 26 to February 16. The calmest month of the year at Stevens Field is August, with an average hourly wind speed of 4.8 miles per hour.

The predominant average hourly wind direction at Stevens Field is from the west throughout the year.

To characterize how pleasant the weather is at Stevens Field 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 Stevens Field for general outdoor tourist activities is from late June to late August, with a peak score in the third week of July.

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 Stevens Field for hot-weather activities is from late June to late July, with a peak score in the first week of July.

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.

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 at Stevens Field typically lasts for 4.2 months (130 days), from around May 23 to around September 30, rarely starting before May 3 or after June 13, and rarely ending before September 10 or after October 20.

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 at Stevens Field should appear around April 28, only rarely appearing before April 14 or after May 13.

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 2.4 months, from May 2 to July 16, with an average daily incident shortwave energy per square meter above 7.3 kWh. The brightest month of the year at Stevens Field is June, with an average of 8.3 kWh.

The darker period of the year lasts for 3.2 months, from November 1 to February 9, with an average daily incident shortwave energy per square meter below 4.0 kWh. The darkest month of the year at Stevens Field is December, with an average of 3.0 kWh.

For the purposes of this report, the geographical coordinates of Stevens Field are 37.289 deg latitude, -107.057 deg longitude, and 7,644 ft elevation.

The topography within 2 miles of Stevens Field contains significant variations in elevation, with a maximum elevation change of 784 feet and an average elevation above sea level of 7,593 feet. Within 10 miles contains significant variations in elevation (5,167 feet). Within 50 miles also contains extreme variations in elevation (8,376 feet).

The area within 2 miles of Stevens Field is covered by shrubs (51%) and trees (49%), within 10 miles by trees (74%) and shrubs (24%), and within 50 miles by trees (57%) and shrubs (31%).