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April Weather at Derby RAAF Curtin Base Australia

Daily high temperatures decrease by 3°F, from 97°F to 94°F, rarely falling below 88°F or exceeding 103°F.

Daily low temperatures decrease by 5°F, from 74°F to 69°F, rarely falling below 62°F or exceeding 79°F.

For reference, on November 10, the hottest day of the year, temperatures at Derby RAAF Curtin Base typically range from 75°F to 103°F, while on July 11, the coldest day of the year, they range from 60°F to 87°F.

Average High and Low Temperature in April at Derby RAAF Curtin Base

Average High and Low Temperature in April at Derby RAAF Curtin BaseApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303055°F55°F60°F60°F65°F65°F70°F70°F75°F75°F80°F80°F85°F85°F90°F90°F95°F95°F100°F100°F105°F105°FMarMayApr 197°FApr 197°F74°F74°FApr 3094°FApr 3094°F69°F69°FApr 1197°FApr 1197°F73°F73°FApr 2196°FApr 2196°F71°F71°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 temperatures for the quarter of the year centered on April. 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 April at Derby RAAF Curtin Base

Average Hourly Temperature in April at Derby RAAF Curtin BaseApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMayNowNowcomfortablecomfortablewarmwarmhotsweltering
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.

Richard-Toll, Senegal (9,777 miles away); Rājkot, India (4,525 miles); and Arcot, India (3,699 miles) are the far-away foreign places with temperatures most similar to Derby RAAF Curtin Base (view comparison).

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The month of April at Derby RAAF Curtin Base experiences very rapidly decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 59% to 40%.

The clearest day of the month is April 30, with clear, mostly clear, or partly cloudy conditions 60% of the time.

For reference, on January 27, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 81%, while on July 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 75%.

Cloud Cover Categories in April at Derby RAAF Curtin Base

Cloud Cover Categories in April at Derby RAAF Curtin BaseApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMayApr 141%Apr 141%Apr 3060%Apr 3060%Apr 1148%Apr 1148%Apr 2155%Apr 2155%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. At Derby RAAF Curtin Base, the chance of a wet day over the course of April is very rapidly decreasing, starting the month at 21% and ending it at 5%.

For reference, the year's highest daily chance of a wet day is 54% on January 26, and its lowest chance is 0% on August 7.

Probability of Precipitation in April at Derby RAAF Curtin Base

Probability of Precipitation in April at Derby RAAF Curtin BaseApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%5%5%10%10%15%15%20%20%25%25%30%30%35%35%40%40%45%45%50%50%MarMayApr 121%Apr 121%Apr 305%Apr 305%Apr 1112%Apr 1112%Apr 217%Apr 217%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 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 April at Derby RAAF Curtin Base is rapidly decreasing, starting the month at 2.3 inches, when it rarely exceeds 6.3 inches or falls below 0.1 inches, and ending the month at 0.6 inches, when it rarely exceeds 2.0 inches or falls below -0.0 inches.

Average Monthly Rainfall in April at Derby RAAF Curtin Base

Average Monthly Rainfall in April at Derby RAAF Curtin BaseApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 in0 in2 in2 in4 in4 in6 in6 in8 in8 in10 in10 in12 in12 in14 in14 inMarMayApr 12.3 inApr 12.3 inApr 300.6 inApr 300.6 inApr 111.4 inApr 111.4 inApr 210.8 inApr 210.8 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 April at Derby RAAF Curtin Base, 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 55 seconds, and weekly decrease of 6 minutes, 23 seconds.

The shortest day of the month is April 30, with 11 hours, 28 minutes of daylight and the longest day is April 1, with 11 hours, 55 minutes of daylight.

Hours of Daylight and Twilight in April at Derby RAAF Curtin Base

Hours of Daylight and Twilight in April at Derby RAAF Curtin BaseApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 hr24 hr4 hr20 hr8 hr16 hr12 hr12 hr16 hr8 hr20 hr4 hr24 hr0 hrMarMaydaydaydaydaynightApr 111 hr, 55 minApr 111 hr, 55 minApr 3011 hr, 28 minApr 3011 hr, 28 minApr 1611 hr, 41 minApr 1611 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 earliest sunrise of the month at Derby RAAF Curtin Base is 5:50 AM on April 1 and the latest sunrise is 7 minutes later at 5:57 AM on April 30.

The latest sunset is 5:45 PM on April 1 and the earliest sunset is 20 minutes earlier at 5:26 PM on April 30.

Daylight saving time is not observed at Derby RAAF Curtin Base during 2024.

For reference, on December 21, the longest day of the year, the Sun rises at 5:07 AM and sets 13 hours, 11 minutes later, at 6:18 PM, while on June 20, the shortest day of the year, it rises at 6:14 AM and sets 11 hours, 5 minutes later, at 5:18 PM.

Sunrise & Sunset with Twilight in April at Derby RAAF Curtin Base

Sunrise & Sunset with Twilight in April at Derby RAAF Curtin BaseApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PMMarMay5:50 AM5:50 AMApr 15:45 PMApr 15:45 PM5:57 AM5:57 AMApr 305:26 PMApr 305:26 PM5:52 AM5:52 AMApr 115:38 PMApr 115:38 PMSolarMidnightSolarMidnightSolarNoonSunriseSunsetNowNow
The solar day over the course of April. 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 April at Derby RAAF Curtin Base

Solar Elevation and Azimuth in April at Derby RAAF Curtin BaseApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 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 AMMarMay00101020202030304040505050607000010102020303030404050506060NowNow
northeastsouthwest
Solar elevation and azimuth over the course of April 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 April 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 April at Derby RAAF Curtin Base

Moon Rise, Set & Phases in April at Derby RAAF Curtin BaseApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303012 AM12 AM4 AM4 AM8 AM8 AM12 PM12 PM4 PM4 PM8 PM8 PM12 AM12 AMMarMayMar 105:01 PMMar 105:01 PMMar 253:01 PMMar 253:01 PMApr 92:22 AMApr 92:22 AMApr 247:50 AMApr 247:50 AMMay 811:23 AMMay 811:23 AMMay 239:54 PMMay 239:54 PM5:21 AM5:21 AM6:07 PM6:07 PM5:54 PM5:54 PM6:22 AM6:22 AM6:05 AM6:05 AM6:02 PM6:02 PM5:00 PM5:00 PM5:55 AM5:55 AM5:50 AM5:50 AM5:23 PM5:23 PM4:55 PM4:55 PM6:31 AM6:31 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.
Apr 2024IlluminationMoonriseMoonsetMoonriseMeridian PassingDistance
1
64%-11:43 AMWSW10:50 PMESE4:47 AMS239,618 mi
2
50%-12:41 PMWSW11:51 PMESE5:46 AMS236,360 mi
3
41%-1:36 PMWSW-6:45 AMS232,970 mi
4
30%12:55 AMESE2:27 PMWSW-7:43 AMS229,674 mi
5
19%1:58 AMESE3:13 PMWSW-8:38 AMS226,752 mi
6
11%3:01 AMESE3:57 PMW-9:31 AMN224,507 mi
7
4%4:02 AME4:39 PMW-10:22 AMN223,213 mi
8
1%5:03 AME5:20 PMW-11:12 AMN223,066 mi
9
0%6:05 AME6:02 PMWNW-12:03 PMN224,135 mi
10
3%7:07 AMENE6:47 PMWNW-12:57 PMN226,341 mi
11
9%8:10 AMENE7:36 PMWNW-1:53 PMN229,472 mi
12
16%9:14 AMENE8:29 PMWNW-2:51 PMN233,215 mi
13
26%10:17 AMENE9:25 PMWNW-3:51 PMN237,212 mi
14
36%11:16 AMENE10:23 PMWNW-4:50 PMN241,117 mi
15
46%12:10 PMENE11:20 PMWNW-5:45 PMN244,639 mi
16
50%12:58 PMENE--6:37 PMN247,569 mi
17
66%-12:15 AMWNW1:40 PMENE7:24 PMN249,783 mi
18
75%-1:07 AMWNW2:18 PMENE8:08 PMN251,237 mi
19
83%-1:57 AMWNW2:52 PMENE8:49 PMN251,947 mi
20
90%-2:45 AMW3:24 PME9:28 PMN251,978 mi
21
95%-3:32 AMW3:55 PME10:06 PMN251,421 mi
22
98%-4:18 AMW4:27 PME10:45 PMN250,383 mi
23
100%-5:06 AMW5:00 PMESE11:26 PMN248,966 mi
24
100%-5:55 AMWSW5:36 PMESE--
25
100%-6:47 AMWSW6:15 PMESE12:09 AMS247,256 mi
26
97%-7:42 AMWSW6:59 PMESE12:56 AMS245,322 mi
27
93%-8:39 AMWSW7:49 PMESE1:47 AMS243,207 mi
28
86%-9:38 AMWSW8:44 PMESE2:42 AMS240,939 mi
29
78%-10:36 AMWSW9:44 PMESE3:40 AMS238,542 mi
30
68%-11:31 AMWSW10:46 PMESE4:39 AMS236,051 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 Derby RAAF Curtin Base is very rapidly decreasing during April, falling from 75% to 23% over the course of the month.

For reference, on February 6, the muggiest day of the year, there are muggy conditions 98% of the time, while on July 30, the least muggy day of the year, there are muggy conditions 1% of the time.

Humidity Comfort Levels in April at Derby RAAF Curtin Base

Humidity Comfort Levels in April at Derby RAAF Curtin BaseApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%0%10%10%20%20%30%30%40%40%50%50%60%60%70%70%80%80%90%90%100%100%MarMayApr 175%Apr 175%Apr 3023%Apr 3023%Apr 1156%Apr 1156%Apr 2137%Apr 2137%NowNowmiserablemiserableoppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydry
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 Derby RAAF Curtin Base is increasing during April, increasing from 6.3 miles per hour to 7.5 miles per hour over the course of the month.

For reference, on July 3, the windiest day of the year, the daily average wind speed is 9.3 miles per hour, while on March 24, the calmest day of the year, the daily average wind speed is 6.2 miles per hour.

Average Wind Speed in April at Derby RAAF Curtin Base

Average Wind Speed in April at Derby RAAF Curtin BaseApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 mph0 mph2 mph2 mph4 mph4 mph6 mph6 mph8 mph8 mph10 mph10 mph12 mph12 mphMarMayApr 16.3 mphApr 16.3 mphApr 307.5 mphApr 307.5 mphApr 116.6 mphApr 116.6 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 at Derby RAAF Curtin Base throughout April is predominantly from the east, with a peak proportion of 57% on April 30.

Wind Direction in April at Derby RAAF Curtin Base

Wind Direction in April at Derby RAAF Curtin BaseWEApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%20%80%40%60%60%40%80%20%100%0%MarMayNowNowwesteastnorthsouth
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).

Derby RAAF Curtin Base 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 Derby RAAF Curtin Base is gradually decreasing during April, falling by 3°F, from 87°F to 84°F, over the course of the month.

Average Water Temperature in April at Derby RAAF Curtin Base

Average Water Temperature in April at Derby RAAF Curtin BaseApr11223344556677889910101111121213131414151516161717181819192020212122222323242425252626272728282929303076°F76°F78°F78°F80°F80°F82°F82°F84°F84°F86°F86°F88°F88°F90°F90°FMarMayApr 187°FApr 187°FApr 3084°FApr 3084°FApr 1186°FApr 1186°FApr 2185°FApr 2185°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 at Derby RAAF Curtin Base 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 April at Derby RAAF Curtin Base

Time Spent in Various Temperature Bands and the Growing Season in April at Derby RAAF Curtin BaseApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300%100%10%90%20%80%30%70%40%60%50%50%60%40%70%30%80%20%90%10%100%0%MarMay100%Apr 16100%Apr 16NowNowcoolcomfortablewarmhotsweltering
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 Derby RAAF Curtin Base are rapidly increasing during April, increasing by 871°F, from 8,194°F to 9,065°F, over the course of the month.

Growing Degree Days in April at Derby RAAF Curtin Base

Growing Degree Days in April at Derby RAAF Curtin BaseApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930308,200°F8,200°F8,400°F8,400°F8,600°F8,600°F8,800°F8,800°F9,000°F9,000°F9,200°F9,200°FMarMayApr 18,194°FApr 18,194°FApr 309,065°FApr 309,065°FApr 118,503°FApr 118,503°FApr 218,806°FApr 218,806°FNowNow
The average growing degree days accumulated over the course of April, 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 Derby RAAF Curtin Base is essentially constant during April, remaining within 0.1 kWh of 5.7 kWh throughout.

The highest average daily incident shortwave solar energy during April is 5.8 kWh on April 13.

Average Daily Incident Shortwave Solar Energy in April at Derby RAAF Curtin Base

Average Daily Incident Shortwave Solar Energy in April at Derby RAAF Curtin BaseApr1122334455667788991010111112121313141415151616171718181919202021212222232324242525262627272828292930300 kWh0 kWh1 kWh1 kWh2 kWh2 kWh3 kWh3 kWh4 kWh4 kWh5 kWh5 kWh6 kWh6 kWh7 kWh7 kWh8 kWh8 kWhMarMayApr 135.8 kWhApr 135.8 kWhApr 15.8 kWhApr 15.8 kWhApr 305.6 kWhApr 305.6 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 Derby RAAF Curtin Base are -17.579 deg latitude, 123.825 deg longitude, and 266 ft elevation.

The topography within 2 miles of Derby RAAF Curtin Base contains only modest variations in elevation, with a maximum elevation change of 115 feet and an average elevation above sea level of 268 feet. Within 10 miles also contains only modest variations in elevation (367 feet). Within 50 miles contains only modest variations in elevation (1,152 feet).

The area within 2 miles of Derby RAAF Curtin Base is covered by sparse vegetation (92%), within 10 miles by sparse vegetation (97%), and within 50 miles by sparse vegetation (62%) and trees (13%).

This report illustrates the typical weather at Derby RAAF Curtin Base, 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

Derby RAAF Curtin Base 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.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

In this case, the only station close and reliable enough to use as a fallback is Broome International Airport.

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.

Please review our full terms contained on our Terms of Service page.