Climate and Average Weather Year Round in Hazelwood United States

In Hazelwood, the summers are warm and wet, the winters are very cold and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 25°F to 80°F and is rarely below 11°F or above 85°F.

Based on the tourism score, the best time of year to visit Hazelwood for warm-weather activities is from mid June to mid September.

The warm season lasts for 3.9 months, from May 22 to September 18, with an average daily high temperature above 73°F. The hottest month of the year in Hazelwood is July, with an average high of 79°F and low of 60°F.

The cold season lasts for 3.0 months, from November 29 to February 28, with an average daily high temperature below 51°F. The coldest month of the year in Hazelwood is January, with an average low of 26°F and high of 45°F.

In Hazelwood, 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 Hazelwood begins around July 24 and lasts for 3.9 months, ending around November 20.

The clearest month of the year in Hazelwood is September, during which on average the sky is clear, mostly clear, or partly cloudy 63% of the time.

The cloudier part of the year begins around November 20 and lasts for 8.1 months, ending around July 24.

The cloudiest month of the year in Hazelwood is January, during which on average the sky is overcast or mostly cloudy 54% 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 in Hazelwood varies throughout the year.

The wetter season lasts 3.5 months, from May 10 to August 24, with a greater than 36% chance of a given day being a wet day. The month with the most wet days in Hazelwood is July, with an average of 14.9 days with at least 0.04 inches of precipitation.

The drier season lasts 8.5 months, from August 24 to May 10. The month with the fewest wet days in Hazelwood is October, with an average of 7.6 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. The month with the most days of rain alone in Hazelwood is July, with an average of 14.9 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 50% on July 11.

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. Hazelwood experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year in Hazelwood. The month with the most rain in Hazelwood is March, with an average rainfall of 4.0 inches.

The month with the least rain in Hazelwood is October, with an average rainfall of 3.0 inches.

Snowfall

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

The snowy period of the year lasts for 4.4 months, from November 16 to March 28, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in Hazelwood is January, with an average snowfall of 6.3 inches.

The snowless period of the year lasts for 7.6 months, from March 28 to November 16. The least snow falls around July 25, with an average total accumulation of 0.0 inches.

The length of the day in Hazelwood varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 46 minutes of daylight; the longest day is June 20, with 14 hours, 33 minutes of daylight.

The earliest sunrise is at 6:16 AM on June 12, and the latest sunrise is 1 hour, 39 minutes later at 7:55 AM on November 2. The earliest sunset is at 5:18 PM on December 5, and the latest sunset is 3 hours, 32 minutes later at 8:51 PM on June 28.

Daylight saving time (DST) is observed in Hazelwood 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.

Hazelwood experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.2 months, from June 8 to September 13, during which time the comfort level is muggy, oppressive, or miserable at least 11% of the time. The month with the most muggy days in Hazelwood is July, with 12.2 days that are muggy or worse.

The least muggy day of the year is February 23, when muggy conditions are essentially unheard of.

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 Hazelwood experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.3 months, from October 31 to May 8, with average wind speeds of more than 4.5 miles per hour. The windiest month of the year in Hazelwood is February, with an average hourly wind speed of 5.8 miles per hour.

The calmer time of year lasts for 5.7 months, from May 8 to October 31. The calmest month of the year in Hazelwood is August, with an average hourly wind speed of 3.0 miles per hour.

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

The wind is most often from the south for 1.3 weeks, from March 29 to April 7 and for 1.9 months, from October 14 to December 12, with a peak percentage of 35% on November 28. The wind is most often from the west for 4.4 months, from April 7 to August 18 and for 3.5 months, from December 12 to March 29, with a peak percentage of 44% on July 12. The wind is most often from the north for 1.9 weeks, from August 18 to August 31 and for 3.7 weeks, from September 18 to October 14, with a peak percentage of 29% on October 13.

To characterize how pleasant the weather is in Hazelwood 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 Hazelwood for general outdoor tourist activities is from mid June to mid September, with a peak score in the second week of August.

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 Hazelwood for hot-weather activities is from late June to late August, with a peak score in the third 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 in Hazelwood typically lasts for 5.6 months (170 days), from around April 26 to around October 13, rarely starting before April 6 or after May 18, and rarely ending before September 26 or after October 30.

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 Hazelwood should appear around March 24, only rarely appearing before March 12 or after April 8.

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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 4.5 months, from April 14 to August 28, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest month of the year in Hazelwood is June, with an average of 6.7 kWh.

The darker period of the year lasts for 2.9 months, from November 10 to February 6, with an average daily incident shortwave energy per square meter below 3.3 kWh. The darkest month of the year in Hazelwood is December, with an average of 2.5 kWh.

For the purposes of this report, the geographical coordinates of Hazelwood are 35.469 deg latitude, -83.004 deg longitude, and 2,762 ft elevation.

The topography within 2 miles of Hazelwood contains very significant variations in elevation, with a maximum elevation change of 1,535 feet and an average elevation above sea level of 2,962 feet. Within 10 miles contains very significant variations in elevation (4,114 feet). Within 50 miles also contains extreme variations in elevation (6,027 feet).

The area within 2 miles of Hazelwood is covered by trees (71%), cropland (16%), and artificial surfaces (13%), within 10 miles by trees (89%), and within 50 miles by trees (86%).