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Spring Weather in Northern Mariana Islands Northern Mariana Islands

Daily high temperatures are around 86°F, rarely falling below 82°F or exceeding 89°F.

Daily low temperatures are around 77°F, rarely falling below 73°F or exceeding 81°F.

For reference, on June 12, the hottest day of the year, temperatures in Northern Mariana Islands typically range from 79°F to 88°F, while on February 18, the coldest day of the year, they range from 76°F to 84°F.

Average High and Low Temperature in the Spring in Northern Mariana Islands

Average High and Low Temperature in the Spring in Northern Mariana IslandsMarAprMay75°F75°F80°F80°F85°F85°F90°F90°F95°F95°F100°F100°FWinterSummerMar 184°FMar 184°F76°F76°FMay 3187°FMay 3187°F79°F79°FApr 185°FApr 185°F77°F77°FMay 187°FMay 187°F78°F78°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 hourly average spring temperatures. 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 the Spring in Northern Mariana Islands

Average Hourly Temperature in the Spring in Northern Mariana IslandsMarAprMay12 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 AMWinterSummerNowNowwarmhot
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.
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The spring in Northern Mariana Islands experiences very rapidly increasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy increasing from 48% to 75%.

The clearest day of the spring is March 7, with clear, mostly clear, or partly cloudy conditions 53% of the time.

For reference, on August 13, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 92%, while on February 18, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 53%.

Cloud Cover Categories in the Spring in Northern Mariana Islands

Cloud Cover Categories in the Spring in Northern Mariana IslandsMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummerMar 152%Mar 152%May 3125%May 3125%Apr 151%Apr 151%May 134%May 134%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.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Northern Mariana Islands, the chance of a wet day over the course of the spring is gradually increasing, starting the season at 7% and ending it at 10%.

For reference, the year's highest daily chance of a wet day is 62% on September 22, and its lowest chance is 3% on March 21.

Probability of Precipitation in the Spring in Northern Mariana Islands

Probability of Precipitation in the Spring in Northern Mariana IslandsMarAprMay0%0%5%5%10%10%15%15%20%20%25%25%30%30%WinterSummerMar 213%Mar 213%Mar 17%Mar 17%May 3110%May 3110%May 110%May 110%NowNowrain
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 season and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day.

The average sliding 31-day rainfall during the spring in Northern Mariana Islands is gradually increasing, starting the season at 0.6 inches, when it rarely exceeds 2.2 inches or falls below -0.0 inches, and ending the season at 0.9 inches, when it rarely exceeds 3.0 inches or falls below -0.0 inches.

The lowest average 31-day accumulation is 0.4 inches on March 26.

Average Monthly Rainfall in the Spring in Northern Mariana Islands

Average Monthly Rainfall in the Spring in Northern Mariana IslandsMarAprMay0 in0 in1 in1 in2 in2 in3 in3 in4 in4 in5 in5 inWinterSummerMar 260.4 inMar 260.4 inMar 10.6 inMar 10.6 inMay 310.9 inMay 310.9 inMay 10.8 inMay 10.8 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 snowfall.

Over the course of the spring in Northern Mariana Islands, the length of the day is rapidly increasing. From the start to the end of the season, the length of the day increases by 1 hour, 7 minutes, implying an average daily increase of 44 seconds, and weekly increase of 5 minutes, 11 seconds.

The shortest day of the spring is March 1, with 11 hours, 51 minutes of daylight and the longest day is May 31, with 12 hours, 58 minutes of daylight.

Hours of Daylight and Twilight in the Spring in Northern Mariana Islands

Hours of Daylight and Twilight in the Spring in Northern Mariana IslandsMarAprMay0 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrWinterSummerMar 2012 hr, 7 minMar 2012 hr, 7 minnightnightdaydayMay 3112 hr, 58 minMay 3112 hr, 58 minMay 112 hr, 41 minMay 112 hr, 41 minNowNow
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 latest sunrise of the spring in Northern Mariana Islands is 6:34 AM on March 1 and the earliest sunrise is 48 minutes earlier at 5:45 AM on May 31.

The earliest sunset is 6:24 PM on March 1 and the latest sunset is 19 minutes later at 6:43 PM on May 31.

Daylight saving time is not observed in Northern Mariana Islands during 2024.

For reference, on June 20, the longest day of the year, the Sun rises at 5:47 AM and sets 13 hours, 2 minutes later, at 6:49 PM, while on December 21, the shortest day of the year, it rises at 6:38 AM and sets 11 hours, 14 minutes later, at 5:51 PM.

Sunrise & Sunset with Twilight in the Spring in Northern Mariana Islands

Sunrise & Sunset with Twilight in the Spring in Northern Mariana IslandsMarAprMay2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMWinterSummer5:45 AM5:45 AMMay 316:43 PMMay 316:43 PM6:34 AM6:34 AMMar 16:24 PMMar 16:24 PM6:12 AM6:12 AMApr 16:29 PMApr 16:29 PM5:53 AM5:53 AMMay 16:34 PMMay 16:34 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day in the spring. 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 the Spring in Northern Mariana Islands

Solar Elevation and Azimuth in the Spring in Northern Mariana IslandsMarAprMay12 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 AMWinterSummer0010202030304050506060708000101020303040405060607080NowNow
northeastsouthwest
Solar elevation and azimuth in the the spring of 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 the spring of 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 the Spring in Northern Mariana Islands

Moon Rise, Set & Phases in the Spring in Northern Mariana IslandsMarAprMay12 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMWinterSummerFeb 109:00 AMFeb 109:00 AMFeb 2410:31 PMFeb 2410:31 PMMar 107:01 PMMar 107:01 PMMar 255:01 PMMar 255:01 PMApr 94:22 AMApr 94:22 AMApr 249:50 AMApr 249:50 AMMay 81:23 PMMay 81:23 PMMay 2311:54 PMMay 2311:54 PMJun 610:38 PMJun 610:38 PMJun 2211:09 AMJun 2211:09 AM6:40 PM6:40 PM6:13 PM6:13 PM7:01 AM7:01 AM6:22 PM6:22 PM6:28 PM6:28 PM6:41 AM6:41 AM6:12 AM6:12 AM7:02 PM7:02 PM5:57 PM5:57 PM5:50 AM5:50 AM5:32 AM5:32 AM6:46 PM6:46 PM6:26 PM6:26 PM5:53 AM5:53 AM6:35 PM6:35 PM6:12 PM6:12 PM5:32 AM5:32 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.

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 in Northern Mariana Islands is essentially constant during the spring, remaining within 1% of 99% throughout.

For reference, on April 30, the muggiest day of the year, there are muggy conditions 100% of the time, while on February 7, the least muggy day of the year, there are muggy conditions 96% of the time.

Humidity Comfort Levels in the Spring in Northern Mariana Islands

Humidity Comfort Levels in the Spring in Northern Mariana IslandsMarAprMay0%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%WinterSummerMar 198%Mar 198%May 31100%May 31100%Apr 1100%Apr 1100%May 1100%May 1100%NowNowmiserablemiserableoppressiveoppressivemuggymuggyhumidhumid
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 in Northern Mariana Islands is very rapidly decreasing during the spring, decreasing from 16.7 miles per hour to 12.4 miles per hour over the course of the season.

For reference, on December 7, the windiest day of the year, the daily average wind speed is 17.4 miles per hour, while on September 7, the calmest day of the year, the daily average wind speed is 11.2 miles per hour.

Average Wind Speed in the Spring in Northern Mariana Islands

Average Wind Speed in the Spring in Northern Mariana IslandsMarAprMay0 mph0 mph5 mph5 mph10 mph10 mph15 mph15 mph20 mph20 mphWinterSummerMar 116.7 mphMar 116.7 mphMay 3112.4 mphMay 3112.4 mphApr 115.5 mphApr 115.5 mphMay 114.3 mphMay 114.3 mphNowNow
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 in Northern Mariana Islands throughout the spring is predominantly from the east, with a peak proportion of 95% on April 8.

Wind Direction in the Spring in Northern Mariana Islands

Wind Direction in the Spring in Northern Mariana IslandsMarAprMay0%100%20%80%40%60%60%40%80%20%100%0%WinterSummerNowNoweastsouth
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).

Northern Mariana Islands 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 in Northern Mariana Islands is gradually increasing during the spring, rising by 3°F, from 81°F to 84°F, over the course of the season.

Average Water Temperature in the Spring in Northern Mariana Islands

Average Water Temperature in the Spring in Northern Mariana IslandsMarAprMay79°F79°F80°F80°F81°F81°F82°F82°F83°F83°F84°F84°F85°F85°F86°F86°FWinterSummerMar 181°FMar 181°FMay 3184°FMay 3184°FApr 182°FApr 182°FMay 183°FMay 183°FNowNow
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 in Northern Mariana Islands 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 the Spring in Northern Mariana Islands

Time Spent in Various Temperature Bands and the Growing Season in the Spring in Northern Mariana IslandsMarAprMay0%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%WinterSummer100%Apr 16100%Apr 16NowNowwarmhotcomfortable
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 in Northern Mariana Islands are very rapidly increasing during the spring, increasing by 2,812°F, from 1,746°F to 4,558°F, over the course of the season.

Growing Degree Days in the Spring in Northern Mariana Islands

Growing Degree Days in the Spring in Northern Mariana IslandsMarAprMay2,000°F2,000°F2,500°F2,500°F3,000°F3,000°F3,500°F3,500°F4,000°F4,000°F4,500°F4,500°FWinterSummerMar 11,746°FMar 11,746°FMay 314,558°FMay 314,558°FApr 12,659°FApr 12,659°FMay 13,593°FMay 13,593°FNowNow
The average growing degree days accumulated over the course of the spring, 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 in Northern Mariana Islands is essentially constant during the spring, remaining within 0.5 kWh of 6.6 kWh throughout.

The highest average daily incident shortwave solar energy during the spring is 7.1 kWh on April 8.

Average Daily Incident Shortwave Solar Energy in the Spring in Northern Mariana Islands

Average Daily Incident Shortwave Solar Energy in the Spring in Northern Mariana IslandsMarAprMay0 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhWinterSummerApr 87.1 kWhApr 87.1 kWhMar 16.4 kWhMar 16.4 kWhMay 316.1 kWhMay 316.1 kWhMay 16.8 kWhMay 16.8 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.

For the purposes of this report, the geographical coordinates of Northern Mariana Islands are 15.214 deg latitude, 145.756 deg longitude, and 0 ft elevation.

The topography within 2 miles of Northern Mariana Islands is essentially flat, with a maximum elevation change of 0 feet and an average elevation above sea level of 0 feet. Within 10 miles is also essentially flat (0 feet). Within 50 miles is also essentially flat (0 feet).

The area within 2 miles of Northern Mariana Islands is covered by cropland (79%) and trees (14%), within 10 miles by water (89%), and within 50 miles by water (99%).

This report illustrates the typical weather in Northern Mariana Islands, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

The details of the data sources used for this report can be found on the Francisco C. Ada International Airport page.

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.

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