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Climate and Average Weather Year Round in Guilford Siding Pennsylvania, United States

In Guilford Siding, the summers are warm and humid, the winters are very cold, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 24°F to 85°F and is rarely below 10°F or above 93°F.

Based on the tourism score, the best time of year to visit Guilford Siding for warm-weather activities is from early June to late September.

Climate in Guilford Siding

very coldcoldcoolwarmwarmcoolcoldJanFebMarAprMayJunJulAugSepOctNovDecNowNow66%66%44%44%clearovercastprecipitation: 3.5 inprecipitation: 3.5 in2.2 in2.2 inmuggy: 48%muggy: 48%0%0%drydrytourism score: 6.7tourism score: 6.70.10.1
Guilford Siding weather by month. Click on each chart for more information.

Average Temperature in Guilford Siding

The hot season lasts for 3.6 months, from May 28 to September 17, with an average daily high temperature above 76°F. The hottest day of the year is July 20, with an average high of 85°F and low of 67°F.

The cold season lasts for 3.1 months, from December 1 to March 5, with an average daily high temperature below 47°F. The coldest day of the year is January 29, with an average low of 24°F and high of 38°F.

Average High and Low Temperature in Guilford Siding

Average High and Low Temperature in Guilford SidinghotcoldcoldJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F10°F10°F20°F20°F30°F30°F40°F40°F50°F50°F60°F60°F70°F70°F80°F80°F90°F90°F100°F100°FJan 2938°FJan 2938°FJul 2085°FJul 2085°F24°F24°F67°F67°FMay 2876°FMay 2876°FSep 1776°FSep 1776°FDec 147°FDec 147°FMar 547°FMar 547°F57°F57°F58°F58°F34°F34°F31°F31°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 Guilford Siding

Average Hourly Temperature in Guilford SidingJanFebMarAprMayJunJulAugSepOctNovDec12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMNowNowfreezingfreezingvery coldvery coldcoldcoldcoolcoolcomfortablewarmfreezing
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.

Tutrakan, Bulgaria (4,976 miles away); Krasnodar, Russia (5,383 miles); and Urus-Martan, Russia (5,701 miles) are the far-away foreign places with temperatures most similar to Guilford Siding (view comparison).

Compare Guilford Siding to another city:

Clouds

In Guilford Siding, 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 Guilford Siding begins around June 20 and lasts for 4.6 months, ending around November 9. On September 4, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 34% of the time.

The cloudier part of the year begins around November 9 and lasts for 7.4 months, ending around June 20. On January 12, the cloudiest day of the year, the sky is overcast or mostly cloudy 56% of the time, and clear, mostly clear, or partly cloudy 44% of the time.

Cloud Cover Categories in Guilford Siding

Cloud Cover Categories in Guilford SidingclearercloudiercloudierJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%Sep 466%Sep 466%Jan 1244%Jan 1244%Jun 2055%Jun 2055%Nov 955%Nov 955%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 Guilford Siding varies throughout the year.

The wetter season lasts 4.9 months, from March 30 to August 26, with a greater than 29% chance of a given day being a wet day. The chance of a wet day peaks at 38% on May 29.

The drier season lasts 7.1 months, from August 26 to March 30. The smallest chance of a wet day is 20% 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 throughout the year is rain alone, with a peak probability of 38% on May 29.

Daily Chance of Precipitation in Guilford Siding

Daily Chance of Precipitation in Guilford SidingwetdrydryJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%May 2938%May 2938%Jan 2820%Jan 2820%Jan 122%Jan 122%Mar 3029%Mar 3029%Aug 2629%Aug 2629%NowNowrainsnow
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. Guilford Siding experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Guilford Siding. The most rain falls during the 31 days centered around May 19, with an average total accumulation of 3.5 inches.

The least rain falls around January 24, with an average total accumulation of 1.4 inches.

Average Monthly Rainfall in Guilford Siding

Average Monthly Rainfall in Guilford SidingJanFebMarAprMayJunJulAugSepOctNovDec0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 in6 in6 in7 in7 inMay 193.5 inMay 193.5 inJan 241.4 inJan 241.4 inSep 273.3 inSep 273.3 inAug 72.9 inAug 72.9 inNowNow
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. Guilford Siding experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 4.7 months, from November 14 to April 3, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around February 1, with an average total liquid-equivalent accumulation of 0.9 inches.

The snowless period of the year lasts for 7.3 months, from April 3 to November 14. The least snow falls around July 26, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall in Guilford Siding

Average Liquid-Equivalent Monthly Snowfall in Guilford SidingsnowsnowJanFebMarAprMayJunJulAugSepOctNovDec0.0 in0.0 in0.5 in0.5 in1.0 in1.0 in1.5 in1.5 in2.0 in2.0 in2.5 in2.5 in3.0 in3.0 in3.5 in3.5 inFeb 10.9 inFeb 10.9 inJul 260.0 inJul 260.0 inNov 140.1 inNov 140.1 inApr 30.1 inApr 30.1 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 Guilford Siding varies significantly over the course of the year. In 2021, the shortest day is December 21, with 9 hours, 20 minutes of daylight; the longest day is June 20, with 15 hours, 0 minutes of daylight.

Hours of Daylight and Twilight in Guilford Siding

Hours of Daylight and Twilight in Guilford SidingJanFebMarAprMayJunJulAugSepOctNovDec0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hr12 hr, 7 minMar 2012 hr, 7 minMar 2015 hr, 0 minJun 2015 hr, 0 minJun 2012 hr, 9 minSep 2212 hr, 9 minSep 229 hr, 21 minDec 219 hr, 21 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 5:41 AM on June 14, and the latest sunrise is 2 hours, 4 minutes later at 7:45 AM on November 6. The earliest sunset is at 4:45 PM on December 7, and the latest sunset is 3 hours, 58 minutes later at 8:42 PM on June 27.

Daylight saving time (DST) is observed in Guilford Siding 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 Guilford Siding

Sunrise & Sunset with Twilight and Daylight Saving Time in Guilford SidingJanFebMarAprMayJunJulAugSepOctNovDec12 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJun 145:41 AMJun 145:41 AM8:42 PMJun 278:42 PMJun 27Dec 74:45 PMDec 74:45 PM7:45 AMNov 67:45 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 Guilford Siding

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.

Guilford Siding experiences significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 3.7 months, from May 30 to September 21, during which time the comfort level is muggy, oppressive, or miserable at least 12% of the time. The muggiest day of the year is July 28, with muggy conditions 48% of the time.

The least muggy day of the year is December 10, when muggy conditions are essentially unheard of.

Humidity Comfort Levels in Guilford Siding

Humidity Comfort Levels in Guilford SidingmuggyJanFebMarAprMayJunJulAugSepOctNovDec0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%Dec 100%Dec 100%Jul 2848%Jul 2848%May 3012%May 3012%Sep 2112%Sep 2112%NowNowoppressiveoppressivemuggymuggydrydrycomfortablecomfortablehumidhumid
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 Guilford Siding experiences significant seasonal variation over the course of the year.

The windier part of the year lasts for 5.9 months, from November 8 to May 3, with average wind speeds of more than 6.2 miles per hour. The windiest day of the year is February 26, with an average hourly wind speed of 7.9 miles per hour.

The calmer time of year lasts for 6.1 months, from May 3 to November 8. The calmest day of the year is August 1, with an average hourly wind speed of 4.5 miles per hour.

Average Wind Speed in Guilford Siding

Average Wind Speed in Guilford SidingwindywindyJanFebMarAprMayJunJulAugSepOctNovDec0 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphFeb 267.9 mphFeb 267.9 mphAug 14.5 mphAug 14.5 mphNov 86.2 mphNov 86.2 mphMay 36.2 mphMay 36.2 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 Guilford Siding varies throughout the year.

The wind is most often from the south for 2.0 months, from August 4 to October 5, with a peak percentage of 35% on September 7. The wind is most often from the west for 10.0 months, from October 5 to August 4, with a peak percentage of 46% on January 1.

Wind Direction in Guilford Siding

Wind Direction in Guilford SidingWSWJanFebMarAprMayJunJulAugSepOctNovDec0%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 Guilford Siding 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 Guilford Siding for general outdoor tourist activities is from early June to late September, with a peak score in the first week of September.

Tourism Score in Guilford Siding

Tourism Score in Guilford Sidingbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810106.76.70.10.1NowNowprecipitationprecipitationcloudscloudstemperaturetemperature 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 Guilford Siding for hot-weather activities is from late June to late August, with a peak score in the third week of July.

Beach/Pool Score in Guilford Siding

Beach/Pool Score in Guilford Sidingbest timeJanFebMarAprMayJunJulAugSepOctNovDec002244668810105.95.90.00.0NowNowprecipitationprecipitationcloudscloudstemperaturetemperaturebeach/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 Guilford Siding typically lasts for 6.8 months (207 days), from around April 9 to around November 2, rarely starting before March 24 or after April 24, and rarely ending before October 15 or after November 18.

Time Spent in Various Temperature Bands and the Growing Season in Guilford Siding

Time Spent in Various Temperature Bands and the Growing Season in Guilford Sidinggrowing seasonJanFebMarAprMayJunJulAugSepOctNovDec0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%50%Apr 950%Apr 950%Nov 250%Nov 290%Apr 2490%Apr 2490%Oct 1590%Oct 1510%Mar 2410%Mar 2410%Nov 1810%Nov 180%Dec 170%Dec 17Jul 16100%Jul 16100%NowNowfreezingvery coldcoolcomfortablewarmhotcoldfrigid
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 Guilford Siding should appear around April 1, only rarely appearing before March 17 or after April 16.

Growing Degree Days in Guilford Siding

Growing Degree Days in Guilford SidingJanFebMarAprMayJunJulAugSepOctNovDec0°F0°F500°F500°F1,000°F1,000°F1,500°F1,500°F2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°FApr 188°FApr 188°FJun 12900°FJun 12900°FJul 201,800°FJul 201,800°FDec 313,586°FDec 313,586°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 3.8 months, from April 30 to August 24, with an average daily incident shortwave energy per square meter above 5.9 kWh. The brightest day of the year is June 23, with an average of 7.0 kWh.

The darker period of the year lasts for 3.1 months, from November 5 to February 10, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest day of the year is December 23, with an average of 1.8 kWh.

Average Daily Incident Shortwave Solar Energy in Guilford Siding

Average Daily Incident Shortwave Solar Energy in Guilford SidingbrightdarkdarkJanFebMarAprMayJunJulAugSepOctNovDec0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWh9 kWh9 kWhJun 237.0 kWhJun 237.0 kWhDec 231.8 kWhDec 231.8 kWhApr 305.9 kWhApr 305.9 kWhAug 245.9 kWhAug 245.9 kWhNov 52.9 kWhNov 52.9 kWhFeb 102.9 kWhFeb 102.9 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 Guilford Siding are 39.865 deg latitude, -77.612 deg longitude, and 827 ft elevation.

The topography within 2 miles of Guilford Siding contains only modest variations in elevation, with a maximum elevation change of 233 feet and an average elevation above sea level of 818 feet. Within 10 miles contains only modest variations in elevation (1,631 feet). Within 50 miles contains very significant variations in elevation (2,556 feet).

The area within 2 miles of Guilford Siding is covered by cropland (100%), within 10 miles by cropland (67%) and trees (27%), and within 50 miles by trees (51%) and cropland (43%).

Data Sources

This report illustrates the typical weather in Guilford Siding, 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 Guilford Siding.

For each station, the records are corrected for the elevation difference between that station and Guilford Siding 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 Guilford Siding is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Guilford Siding and a given station.

The stations contributing to this reconstruction are: Hagerstown Regional Airport (KHGR, 48%, 20 kilometers, southwest); Site R (KRYT, 46%, 21 kilometers, southeast); and Altoona-Blair County Airport (KAOO, 6%, 77 kilometers, northwest).

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.