Average Weather in Meridian Idaho, United States
In Meridian, the summers are short, hot, dry, and mostly clear and the winters are very cold and partly cloudy. Over the course of the year, the temperature typically varies from 23°F to 92°F and is rarely below 9°F or above 100°F.
Based on the tourism score, the best time of year to visit Meridian for warm-weather activities is from late June to late August.
The hot season lasts for 2.9 months, from June 14 to September 11, with an average daily high temperature above 81°F. The hottest day of the year is July 26, with an average high of 92°F and low of 61°F.
The cold season lasts for 3.0 months, from November 19 to February 19, with an average daily high temperature below 47°F. The coldest day of the year is January 1, with an average low of 23°F and high of 35°F.
Average High and Low Temperature
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 Meridian, 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 Meridian begins around June 10 and lasts for 4.1 months, ending around October 13. On July 28, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 84% of the time, and overcast or mostly cloudy 16% of the time.
The cloudier part of the year begins around October 13 and lasts for 7.9 months, ending around June 10. On January 11, the cloudiest day of the year, the sky is overcast or mostly cloudy 59% of the time, and clear, mostly clear, or partly cloudy 41% of the time.
Cloud Cover Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Meridian varies throughout the year.
The wetter season lasts 7.3 months, from October 23 to June 3, with a greater than 15% chance of a given day being a wet day. The chance of a wet day peaks at 26% on December 1.
The drier season lasts 4.6 months, from June 3 to October 23. The smallest chance of a wet day is 3% on July 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 throughout the year is rain alone, with a peak probability of 22% on November 11.
Daily Chance of Precipitation
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. Meridian experiences some seasonal variation in monthly rainfall.
The rainy period of the year lasts for 8.9 months, from September 21 to June 19, with a sliding 31-day rainfall of at least 0.5 inches. The most rain falls during the 31 days centered around December 7, with an average total accumulation of 1.3 inches.
The rainless period of the year lasts for 3.1 months, from June 19 to September 21. The least rain falls around August 1, with an average total accumulation of 0.2 inches.
Average Monthly Rainfall
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. Meridian experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.0 months, from November 15 to February 16, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 27, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 9.0 months, from February 16 to November 15. The least snow falls around July 11, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Meridian varies significantly over the course of the year. In 2021, the shortest day is December 21, with 8 hours, 56 minutes of daylight; the longest day is June 20, with 15 hours, 26 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:03 AM on June 15, and the latest sunrise is 2 hours, 25 minutes later at 8:28 AM on November 6. The earliest sunset is at 5:08 PM on December 8, and the latest sunset is 4 hours, 22 minutes later at 9:31 PM on June 26.
Daylight saving time (DST) is observed in Meridian 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
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
The perceived humidity level in Meridian, 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.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed in Meridian experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 4.6 months, from February 7 to June 24, with average wind speeds of more than 6.8 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 7.5 miles per hour.
The calmer time of year lasts for 7.4 months, from June 24 to February 7. The calmest day of the year is September 15, with an average hourly wind speed of 6.1 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Meridian varies throughout the year.
The wind is most often from the east for 1.2 months, from January 19 to February 26, with a peak percentage of 33% on February 2. The wind is most often from the south for 5.0 days, from February 26 to March 3 and for 2.5 months, from November 4 to January 19, with a peak percentage of 28% on March 2. The wind is most often from the west for 8.0 months, from March 3 to November 4, with a peak percentage of 43% on July 12.
Best Time of Year to Visit
To characterize how pleasant the weather is in Meridian 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 Meridian for general outdoor tourist activities is from late June to late August, with a peak score in the last 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 Meridian for hot-weather activities is from mid July to mid August, with a peak score in the last week of July.
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.
The growing season in Meridian typically lasts for 5.9 months (180 days), from around April 23 to around October 20, rarely starting before April 3 or after May 12, and rarely ending before September 30 or after November 11.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Meridian should appear around April 10, only rarely appearing before March 28 or after April 28.
Growing Degree Days
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 3.3 months, from May 13 to August 21, with an average daily incident shortwave energy per square meter above 6.8 kWh. The brightest day of the year is July 3, with an average of 8.1 kWh.
The darker period of the year lasts for 3.6 months, from October 30 to February 16, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest day of the year is December 21, with an average of 1.6 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Meridian are 43.612 deg latitude, -116.392 deg longitude, and 2,602 ft elevation.
The topography within 2 miles of Meridian contains only modest variations in elevation, with a maximum elevation change of 102 feet and an average elevation above sea level of 2,602 feet. Within 10 miles contains only modest variations in elevation (1,152 feet). Within 50 miles contains very significant variations in elevation (7,254 feet).
The area within 2 miles of Meridian is covered by artificial surfaces (78%) and shrubs (15%), within 10 miles by cropland (52%) and artificial surfaces (30%), and within 50 miles by shrubs (47%) and grassland (25%).
This report illustrates the typical weather in Meridian, 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 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Meridian.
For each station, the records are corrected for the elevation difference between that station and Meridian 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 Meridian is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Meridian and a given station.
Time zones for airports and weather stations are provided by AskGeo.com .