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July Weather at Henderson Field Civil Airport U.S. Outlying Islands

Daily high temperatures are around 84°F, rarely falling below 81°F or exceeding 87°F.

Daily low temperatures are around 76°F, rarely falling below 73°F or exceeding 79°F.

For reference, on August 19, the hottest day of the year, temperatures at Henderson Field Civil Airport typically range from 78°F to 85°F, while on February 12, the coldest day of the year, they range from 63°F to 71°F.

Average High and Low Temperature in July at Henderson Field Civil Airport

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 hourly average temperatures for the quarter of the year centered on July. The horizontal axis is the day, 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 July at Henderson Field Civil Airport

Average Hourly Temperature in July at Henderson Field Civil AirportJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMJunAugcomfortablewarmcomfortable
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.

Saint George, Bermuda (6,361 miles away); Lalmatie, Mauritius (8,962 miles); and Mont-Dore, New Caledonia (3,651 miles) are the far-away foreign places with temperatures most similar to Henderson Field Civil Airport (view comparison).

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The month of July at Henderson Field Civil Airport experiences essentially constant cloud cover, with the percentage of time that the sky is overcast or mostly cloudy remaining about 47% throughout the month. The lowest chance of overcast or mostly cloudy conditions is 45% on July 8.

The clearest day of the month is July 8, with clear, mostly clear, or partly cloudy conditions 55% of the time.

For reference, on May 31, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on January 23, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 72%.

Cloud Cover Categories in July at Henderson Field Civil Airport

Cloud Cover Categories in July at Henderson Field Civil AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAugMay 3142%May 3142%Jul 153%Jul 153%Jul 3151%Jul 3151%Jul 1154%Jul 1154%Jul 2154%Jul 2154%clearmostly 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.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Henderson Field Civil Airport, the chance of a wet day over the course of July is rapidly increasing, starting the month at 8% and ending it at 16%.

For reference, the year's highest daily chance of a wet day is 30% on February 12, and its lowest chance is 7% on July 8.

Probability of Precipitation in July at Henderson Field Civil Airport

Probability of Precipitation in July at Henderson Field Civil AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%2%2%4%4%6%6%8%8%10%10%12%12%14%14%16%16%18%18%20%20%22%22%24%24%JunAugJul 87%Jul 87%Jul 18%Jul 18%Jul 3116%Jul 3116%Jul 2111%Jul 2111%rain
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 month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during July at Henderson Field Civil Airport is increasing, starting the month at 0.6 inches, when it rarely exceeds 1.7 inches, and ending the month at 1.3 inches, when it rarely exceeds 2.8 inches.

The lowest average 31-day accumulation is 0.6 inches on July 5.

Average Monthly Rainfall in July at Henderson Field Civil Airport

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 snowfall.

Over the course of July at Henderson Field Civil Airport, the length of the day is gradually decreasing. From the start to the end of the month, the length of the day decreases by 26 minutes, implying an average daily decrease of 52 seconds, and weekly decrease of 6 minutes, 2 seconds.

The shortest day of the month is July 31, with 13 hours, 28 minutes of daylight and the longest day is July 1, with 13 hours, 54 minutes of daylight.

Hours of Daylight and Twilight in July at Henderson Field Civil Airport

Hours of Daylight and Twilight in July at Henderson Field Civil AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrJunAugnightnightdaydayJul 113 hr, 54 minJul 113 hr, 54 minJul 3113 hr, 28 minJul 3113 hr, 28 minJul 1613 hr, 44 minJul 1613 hr, 44 min
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 of the month at Henderson Field Civil Airport is 5:56 AM on July 1 and the latest sunrise is 15 minutes later at 6:11 AM on July 31.

The latest sunset is 7:50 PM on July 1 and the earliest sunset is 11 minutes earlier at 7:39 PM on July 31.

Daylight saving time is not observed at Henderson Field Civil Airport during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:53 AM and sets 13 hours, 56 minutes later, at 7:49 PM, while on December 21, the shortest day of the year, it rises at 7:37 AM and sets 10 hours, 21 minutes later, at 5:58 PM.

Sunrise & Sunset with Twilight in July at Henderson Field Civil Airport

The solar day over the course of July. 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 figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

Solar Elevation and Azimuth in July at Henderson Field Civil Airport

Solar Elevation and Azimuth in July at Henderson Field Civil AirportJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM2 AM2 AM4 AM4 AM6 AM6 AM8 AM8 AM10 AM10 AM12 PM12 PM2 PM2 PM4 PM4 PM6 PM6 PM8 PM8 PM10 PM10 PM12 AM12 AMJunAug001010202020303040405050506060707080800001010202030303040405050606060707080
northeastsouthwest
Solar elevation and azimuth over the course of July 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).

The figure below presents a compact representation of key lunar data for July 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

Moon Rise, Set & Phases in July at Henderson Field Civil Airport

Moon Rise, Set & Phases in July at Henderson Field Civil AirportJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313112 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMJunAugJun 61:38 AMJun 61:38 AMJun 212:09 PMJun 212:09 PMJul 511:58 AMJul 511:58 AMJul 2011:18 PMJul 2011:18 PMAug 412:14 AMAug 412:14 AMAug 197:26 AMAug 197:26 AM5:51 AM5:51 AM8:38 PM8:38 PM8:13 PM8:13 PM6:24 AM6:24 AM5:35 AM5:35 AM8:18 PM8:18 PM7:51 PM7:51 PM6:22 AM6:22 AM5:28 AM5:28 AM7:41 PM7:41 PM7:12 PM7:12 PM6:20 AM6:20 AM
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.
Jul 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
19%2:12 AMENE4:13 PMWNW-9:09 AMS232,541 mi
2
11%2:54 AMENE5:20 PMWNW-10:04 AMS234,110 mi
3
5%3:42 AMENE6:25 PMWNW-11:02 AMS236,000 mi
4
1%4:36 AMENE7:25 PMWNW-12:01 PMN238,182 mi
5
0%5:35 AMENE8:18 PMWNW-12:59 PMS240,584 mi
6
1%6:37 AMENE9:04 PMWNW-1:53 PMS243,083 mi
7
5%7:38 AMENE9:43 PMWNW-2:43 PMS245,524 mi
8
10%8:37 AMENE10:16 PMWNW-3:29 PMS247,731 mi
9
17%9:33 AMENE10:46 PMWNW-4:12 PMS249,524 mi
10
25%10:27 AME11:13 PMW-4:52 PMS250,742 mi
11
34%11:19 AME11:39 PMW-5:30 PMS251,251 mi
12
43%12:11 PME--6:09 PMS250,965 mi
13
50%-12:06 AMW1:03 PME6:49 PMS249,851 mi
14
63%-12:34 AMWSW1:57 PMESE7:31 PMS247,946 mi
15
72%-1:04 AMWSW2:54 PMESE8:17 PMS245,350 mi
16
81%-1:40 AMWSW3:54 PMESE9:07 PMS242,233 mi
17
89%-2:21 AMWSW4:56 PMESE10:03 PMS238,827 mi
18
95%-3:10 AMWSW5:58 PMESE11:03 PMS235,409 mi
19
97%-4:08 AMWSW6:57 PMESE--
20
100%-5:13 AMWSW7:51 PMESE12:05 AMS232,275 mi
21
100%-6:22 AMWSW8:38 PMESE1:06 AMS229,697 mi
22
98%-7:32 AMWSW9:19 PMESE2:05 AMS227,875 mi
23
94%-8:40 AMWSW9:55 PME2:59 AMS226,912 mi
24
87%-9:47 AMW10:29 PME3:50 AMS226,801 mi
25
77%-10:51 AMW11:02 PME4:39 AMS227,451 mi
26
66%-11:56 AMW11:36 PMENE5:27 AMS228,715 mi
27
50%-1:01 PMWNW-6:15 AMS230,423 mi
28
43%12:12 AMENE2:06 PMWNW-7:06 AMS232,421 mi
29
32%12:52 AMENE3:12 PMWNW-7:59 AMS234,583 mi
30
22%1:38 AMENE4:17 PMWNW-8:55 AMS236,822 mi
31
13%2:29 AMENE5:18 PMWNW-9:53 AMN239,083 mi

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 chance that a given day will be muggy at Henderson Field Civil Airport is gradually increasing during July, rising from 95% to 99% over the course of the month.

For reference, on August 7, the muggiest day of the year, there are muggy conditions 99% of the time, while on March 1, the least muggy day of the year, there are muggy conditions 11% of the time.

Humidity Comfort Levels in July at Henderson Field Civil Airport

Humidity Comfort Levels in July at Henderson Field Civil AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%JunAugJul 195%Jul 195%Jul 3199%Jul 3199%Jul 1198%Jul 1198%Jul 2198%Jul 2198%miserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortable
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.

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 Henderson Field Civil Airport is essentially constant during July, remaining within 0.4 miles per hour of 12.9 miles per hour throughout.

For reference, on January 19, the windiest day of the year, the daily average wind speed is 18.5 miles per hour, while on September 7, the calmest day of the year, the daily average wind speed is 11.5 miles per hour.

The highest daily average wind speed during July is 13.2 miles per hour on July 23.

Average Wind Speed in July at Henderson Field Civil Airport

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The hourly average wind direction at Henderson Field Civil Airport throughout July is predominantly from the east, with a peak proportion of 80% on July 23.

Wind Direction in July at Henderson Field Civil Airport

Wind Direction in July at Henderson Field Civil AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%20%80%40%60%60%40%80%20%100%0%JunAugsoutheastnorthwest
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).

Henderson Field Civil 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 surface water temperature at Henderson Field Civil Airport is essentially constant during July, remaining within 1°F of 79°F throughout.

Average Water Temperature in July at Henderson Field Civil Airport

Average Water Temperature in July at Henderson Field Civil AirportJul112233445566778899101011111212131314141515161617171818191920202121222223232424252526262727282829293030313172°F72°F74°F74°F76°F76°F78°F78°F80°F80°F82°F82°F84°F84°FJunAugJul 178°FJul 178°FJul 3180°FJul 3180°FJul 1179°FJul 1179°FJul 2180°FJul 2180°F
The daily average water temperature (purple line), with 25th to 75th and 10th to 90th percentile bands.

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).

Temperatures at Henderson Field Civil Airport are sufficiently warm year round that it is not entirely meaningful to discuss the growing season in these terms. We nevertheless include the chart below as an illustration of the distribution of temperatures experienced throughout the year.

Time Spent in Various Temperature Bands and the Growing Season in July at Henderson Field Civil Airport

Time Spent in Various Temperature Bands and the Growing Season in July at Henderson Field Civil AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%JunAug100%Jul 16100%Jul 16100%Jul 2100%Jul 2comfortablewarmhot
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.

The average accumulated growing degree days at Henderson Field Civil Airport are rapidly increasing during July, increasing by 898°F, from 3,605°F to 4,504°F, over the course of the month.

Growing Degree Days in July at Henderson Field Civil Airport

Growing Degree Days in July at Henderson Field Civil AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031313,400°F3,400°F3,600°F3,600°F3,800°F3,800°F4,000°F4,000°F4,200°F4,200°F4,400°F4,400°F4,600°F4,600°F4,800°F4,800°FJunAugJul 13,605°FJul 13,605°FJul 314,504°FJul 314,504°FJul 113,902°FJul 113,902°FJul 214,201°FJul 214,201°F
The average growing degree days accumulated over the course of July, with 25th to 75th and 10th to 90th percentile bands.

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 at Henderson Field Civil Airport is gradually decreasing during July, falling by 0.7 kWh, from 7.0 kWh to 6.4 kWh, over the course of the month.

Average Daily Incident Shortwave Solar Energy in July at Henderson Field Civil Airport

Average Daily Incident Shortwave Solar Energy in July at Henderson Field Civil AirportJul11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303031310 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhJunAugJul 17.0 kWhJul 17.0 kWhJul 316.4 kWhJul 316.4 kWhJul 116.9 kWhJul 116.9 kWhJul 216.7 kWhJul 216.7 kWh
The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

For the purposes of this report, the geographical coordinates of Henderson Field Civil Airport are 28.202 deg latitude, -177.381 deg longitude, and 39 ft elevation.

The topography within 2 miles of Henderson Field Civil Airport contains only modest variations in elevation, with a maximum elevation change of 98 feet and an average elevation above sea level of 6 feet. Within 10 miles also contains only modest variations in elevation (98 feet). Within 50 miles also contains only modest variations in elevation (98 feet).

The area within 2 miles of Henderson Field Civil Airport is covered by water (100%), within 10 miles by water (100%), and within 50 miles by water (100%).

This report illustrates the typical weather at Henderson Field Civil Airport, 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

Henderson Field Civil Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

There are no other weather stations in our network within 200 kilometers of this location. Consequently, in the case of missing or erroneous measurements from this station, we fall back on NASA's MERRA-2 modern-era reanalysis , adjusted according to typical seasonal and diurnal differences between this station and the wide-area MERRA-2 reconstructed values.

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 © OpenStreetMap contributors.

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.

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