Climate and Average Weather Year Round at Danbury Municipal Airport Connecticut, United States

At Danbury Municipal Airport, the summers are warm and wet, the winters are freezing and snowy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 18°F to 82°F and is rarely below 2°F or above 89°F.

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

The warm season lasts for 3.5 months, from May 30 to September 14, with an average daily high temperature above 72°F. The hottest month of the year at Danbury Municipal Airport is July, with an average high of 81°F and low of 62°F.

The cold season lasts for 3.3 months, from December 2 to March 10, with an average daily high temperature below 44°F. The coldest month of the year at Danbury Municipal Airport is January, with an average low of 19°F and high of 35°F.

At Danbury Municipal Airport, 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 Danbury Municipal Airport begins around June 24 and lasts for 4.6 months, ending around November 10.

The clearest month of the year at Danbury Municipal Airport is September, during which on average the sky is clear, mostly clear, or partly cloudy 64% of the time.

The cloudier part of the year begins around November 10 and lasts for 7.4 months, ending around June 24.

The cloudiest month of the year at Danbury Municipal Airport is February, during which on average the sky is overcast or mostly cloudy 52% 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 Danbury Municipal Airport varies throughout the year.

The wetter season lasts 4.3 months, from April 9 to August 19, with a greater than 29% chance of a given day being a wet day. The month with the most wet days at Danbury Municipal Airport is July, with an average of 10.6 days with at least 0.04 inches of precipitation.

The drier season lasts 7.7 months, from August 19 to April 9. The month with the fewest wet days at Danbury Municipal Airport is January, with an average of 7.3 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 at Danbury Municipal Airport is July, with an average of 10.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 37% on May 29.

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. Danbury Municipal Airport experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year at Danbury Municipal Airport. The month with the most rain at Danbury Municipal Airport is October, with an average rainfall of 3.7 inches.

The month with the least rain at Danbury Municipal Airport is January, with an average rainfall of 1.7 inches.

Snowfall

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

The snowy period of the year lasts for 5.5 months, from October 30 to April 14, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow at Danbury Municipal Airport is January, with an average snowfall of 10.9 inches.

The snowless period of the year lasts for 6.5 months, from April 14 to October 30. The least snow falls around July 23, with an average total accumulation of 0.0 inches.

The length of the day at Danbury Municipal Airport varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 11 minutes of daylight; the longest day is June 20, with 15 hours, 10 minutes of daylight.

The earliest sunrise is at 5:19 AM on June 14, and the latest sunrise is 2 hours, 7 minutes later at 7:27 AM on November 2. The earliest sunset is at 4:24 PM on December 7, and the latest sunset is 4 hours, 7 minutes later at 8:31 PM on June 27.

Daylight saving time (DST) is observed at Danbury Municipal Airport 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.

Danbury Municipal Airport experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.6 months, from June 4 to September 22, during which time the comfort level is muggy, oppressive, or miserable at least 10% of the time. The month with the most muggy days at Danbury Municipal Airport is July, with 11.4 days that are muggy or worse.

The least muggy day of the year is February 9, 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 at Danbury Municipal Airport experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.8 months, from October 28 to April 22, with average wind speeds of more than 5.8 miles per hour. The windiest month of the year at Danbury Municipal Airport is February, with an average hourly wind speed of 7.4 miles per hour.

The calmer time of year lasts for 6.2 months, from April 22 to October 28. The calmest month of the year at Danbury Municipal Airport is August, with an average hourly wind speed of 4.3 miles per hour.

The predominant average hourly wind direction at Danbury Municipal Airport varies throughout the year.

The wind is most often from the north for 1.9 months, from March 4 to April 30 and for 1.3 weeks, from September 24 to October 3, with a peak percentage of 35% on March 10. The wind is most often from the south for 1.6 months, from April 30 to June 19 and for 2.1 months, from July 22 to September 24, with a peak percentage of 36% on July 27. The wind is most often from the west for 1.1 months, from June 19 to July 22 and for 5.0 months, from October 3 to March 4, with a peak percentage of 37% on July 6.

Danbury Municipal Airport is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water.

The average water temperature experiences significant seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.6 months, from June 23 to October 9, with an average temperature above 65°F. The month of the year at Danbury Municipal Airport with the warmest water is August, with an average temperature of 72°F.

The time of year with cooler water lasts for 3.4 months, from December 30 to April 12, with an average temperature below 43°F. The month of the year at Danbury Municipal Airport with the coolest water is February, with an average temperature of 37°F.

To characterize how pleasant the weather is at Danbury Municipal Airport 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 Danbury Municipal Airport for general outdoor tourist activities is from mid June to mid September, with a peak score in the third 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 Danbury Municipal Airport for hot-weather activities is from early July to mid 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 at Danbury Municipal Airport typically lasts for 5.3 months (164 days), from around May 2 to around October 13, rarely starting before April 13 or after May 20, and rarely ending before September 24 or after October 31.

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 Danbury Municipal Airport should appear around April 20, only rarely appearing before April 6 or after May 1.

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 3.7 months, from April 30 to August 20, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest month of the year at Danbury Municipal Airport is June, with an average of 6.7 kWh.

The darker period of the year lasts for 3.2 months, from November 4 to February 10, with an average daily incident shortwave energy per square meter below 2.7 kWh. The darkest month of the year at Danbury Municipal Airport is December, with an average of 1.8 kWh.

For the purposes of this report, the geographical coordinates of Danbury Municipal Airport are 41.371 deg latitude, -73.482 deg longitude, and 453 ft elevation.

The topography within 2 miles of Danbury Municipal Airport contains significant variations in elevation, with a maximum elevation change of 574 feet and an average elevation above sea level of 590 feet. Within 10 miles contains significant variations in elevation (1,063 feet). Within 50 miles contains very significant variations in elevation (2,421 feet).

The area within 2 miles of Danbury Municipal Airport is covered by trees (51%) and artificial surfaces (49%), within 10 miles by trees (83%) and artificial surfaces (11%), and within 50 miles by trees (55%) and artificial surfaces (25%).