Malay Falls
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Malay Falls clear sky chart from 2005-11-06 to 2024-01-16.

This page is a summary of past forecasts. Even though it's based only on forecasts, some people use these pages as clue to a site's climate. But climate data based on actual observation should be preferred (if you can find it!).

Cloud, Transparency and Seeing forecasts are summarized individually. But because good observing conditions require a combination of minimum cloud cover, transparency and seeing, the individual forecast summaries can be difficult to interpret. The observing conditions section counts the combinations of conditions needed for common types of astronomical observation.

Observing Conditions

The following tables count the occurrence of the combinations of forecast and darkness conditions needed for different observations. Conditions are rated by by what percentage of the hours the observation would likely be attempted are usable.

Observation Type	Minimum conditions for hour to be usable				Out of hours
	Clear of Clouds	Transparency	Seeing	Sky Brightness
Planetary:	50%	(no limit)	Average	(no limit)	Nighttime Hours
Deep Sky:	70%	Average	(no limit)	5.9	Nighttime Hours
CCD Imaging:	70%	Below Average	Poor	(no limit)	Nighttime Hours

Percentages are of nighttime hours per month, or per year, when a particular observing conditions was met. Deep Sky percentages never exceed 50% because the moon is up half the time. Deep sky percentages are much lower for charts at high latitudes because of fewer dark hours in the summer.

Overall

By Month

Individual Forecasts

The length of each colored bar in the "occurrence of each Forecast" column is proportional to the number of times the chart forecast that color. The percentages are of the total number of hours per month, or per year, with a particular forecast. The colors as the same as those used in clear sky charts.

Note: Transparency probabilities are only counted for those hours that have 30% or less cloud cover. Seeing probabilities are only counted for those hours that have 80% or less cloud cover. If that's too tricky, try Observing Conditions instead.

Overall

		Occurrence of each Forecast	Data Points
Cloud Cover	Day	23% 10% 4 7% 5% 3 4 4 5% 6% 28%	74735
	Night	23% 10% 3 6% 5% 3 4 4 5% 6% 30%	75073
Transparency	Day	56% 4 11% 19% 9% 1	74438
	Night	56% 3 11% 20% 9% 1	74905
Seeing	Day	28% 10% 29% 23% 8% 1	16308
	Night	29% 11% 28% 24% 8% 1	24071

By Month

Percentage Cloud Cover NE (2006-)
Color Meanings: Overcast 90% covered 80% covered 70% covered 60% covered 50% covered 40% covered 30% covered 20% covered 10% covered Clear
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	19% 13% 6% 10% 6% 3 4 4 4 6% 25%	1516
	11th to 20th	Day	23% 14% 5% 8% 6% 3 3 4 5% 6% 24%	1481
	21st to end	Day	15% 10% 5% 8% 7% 3 5% 5% 5% 7% 30%	1750
February	1st to 10th	Day	21% 12% 4 8% 6% 4 5% 4 4 5% 27%	1620
	11th to 20th	Day	19% 13% 5% 8% 6% 3 5% 4 4 5% 28%	1573
	21st to end	Day	13% 16% 5% 7% 6% 3 4 3 4 6% 33%	1417
March	1st to 10th	Day	16% 15% 5% 9% 8% 3 5% 4 4 5% 27%	1886
	11th to 20th	Day	17% 12% 7% 8% 8% 4 4 4 4 5% 28%	1980
	21st to end	Day	18% 13% 5% 10% 7% 3 4 3 4 4 28%	2227
April	1st to 10th	Day	27% 12% 5% 6% 5% 3 4 4 4 4 25%	2160
	11th to 20th	Day	25% 11% 3 6% 5% 3 4 4 5% 6% 30%	2134
	21st to end	Day	26% 11% 3 5% 5% 3 4 4 4 6% 27%	2322
May	1st to 10th	Day	29% 11% 3 5% 5% 3 4 5% 4 6% 24%	2474
	11th to 20th	Day	23% 11% 3 7% 6% 3 3 5% 4 6% 28%	2478
	21st to end	Day	26% 11% 3 6% 5% 3 3 3 5% 6% 28%	2724
June	1st to 10th	Day	30% 9% 4 7% 5% 2 4 4 6% 7% 22%	2520
	11th to 20th	Day	26% 8% 3 6% 6% 3 4 4 4 6% 29%	2520
	21st to end	Day	33% 9% 4 6% 4 3 4 4 5% 6% 21%	2520
July	1st to 10th	Day	24% 7% 3 4 5% 3 4 6% 6% 9% 29%	2520
	11th to 20th	Day	23% 8% 3 6% 5% 3 5% 4 6% 9% 27%	2520
	21st to end	Day	28% 10% 3 6% 4 3 5% 4 5% 7% 25%	2745
August	1st to 10th	Day	20% 8% 3 6% 5% 3 5% 5% 6% 8% 32%	2351
	11th to 20th	Day	20% 7% 3 6% 5% 3 5% 5% 6% 8% 30%	2304
	21st to end	Day	19% 7% 2 5% 5% 3 4 5% 5% 7% 37%	2415
September	1st to 10th	Day	20% 6% 2 5% 7% 3 4 4 6% 7% 36%	2160
	11th to 20th	Day	22% 7% 3 5% 4 3 3 4 5% 7% 35%	2160
	21st to end	Day	20% 7% 3 6% 4 3 5% 5% 5% 7% 35%	1888
October	1st to 10th	Day	19% 8% 3 5% 6% 4 4 5% 5% 7% 34%	1800
	11th to 20th	Day	23% 7% 3 5% 4 4 5% 5% 4 7% 32%	1800
	21st to end	Day	23% 9% 3 6% 7% 3 4 4 5% 7% 28%	1922
November	1st to 10th	Day	25% 9% 3 6% 5% 2 5% 3 5% 7% 29%	1599
	11th to 20th	Day	24% 8% 3 7% 6% 3 3 5% 5% 6% 29%	1520
	21st to end	Day	20% 10% 4 7% 6% 4 5% 5% 5% 8% 28%	1520
December	1st to 10th	Day	26% 13% 4 6% 5% 3 4 4 4 5% 25%	1520
	11th to 20th	Day	31% 12% 4 7% 5% 2 4 4 4 6% 22%	1906
	21st to end	Day	23% 10% 6% 10% 5% 3 4 3 4 5% 26%	2783
January	1st to 10th	Night	20% 12% 4 8% 6% 3 5% 5% 5% 6% 26%	2649
	11th to 20th	Night	23% 11% 5% 7% 6% 3 5% 5% 5% 5% 25%	2601
	21st to end	Night	16% 10% 6% 7% 6% 4 4 5% 5% 7% 30%	2601
February	1st to 10th	Night	22% 10% 4 8% 6% 4 5% 4 5% 6% 26%	2340
	11th to 20th	Night	19% 11% 4 8% 7% 3 4 5% 5% 6% 27%	2273
	21st to end	Night	12% 14% 6% 8% 7% 4 5% 5% 5% 7% 29%	1838
March	1st to 10th	Night	17% 12% 6% 8% 7% 3 5% 4 4 7% 26%	2057
	11th to 20th	Night	21% 9% 4 6% 5% 3 4 4 6% 7% 31%	1979
	21st to end	Night	20% 10% 4 7% 6% 3 4 4 4 5% 31%	2128
April	1st to 10th	Night	27% 11% 4 5% 6% 3 4 4 5% 5% 27%	1800
	11th to 20th	Night	23% 10% 2 6% 5% 3 4 4 4 6% 32%	1776
	21st to end	Night	27% 10% 3 5% 5% 3 4 5% 4 6% 29%	1635
May	1st to 10th	Night	30% 10% 4 5% 5% 2 4 4 5% 6% 27%	1485
	11th to 20th	Night	26% 8% 3 5% 4 3 5% 5% 5% 6% 30%	1416
	21st to end	Night	23% 10% 3 7% 4 3 4 5% 6% 8% 27%	1550
June	1st to 10th	Night	32% 11% 3 5% 5% 3 3 4 4 7% 24%	1440
	11th to 20th	Night	26% 9% 2 5% 5% 3 4 4 4 8% 31%	1440
	21st to end	Night	33% 11% 4 6% 6% 3 3 3 4 4 23%	1440
July	1st to 10th	Night	23% 8% 4 6% 4 3 5% 5% 6% 9% 28%	1440
	11th to 20th	Night	25% 11% 4 8% 5% 4 4 5% 5% 6% 24%	1440
	21st to end	Night	26% 11% 4 5% 5% 4 5% 5% 5% 7% 24%	1573
August	1st to 10th	Night	21% 9% 2 5% 5% 3 4 5% 6% 7% 34%	1584
	11th to 20th	Night	21% 10% 3 6% 5% 3 4 5% 6% 8% 30%	1596
	21st to end	Night	21% 6% 2 5% 4 2 4 4 4 7% 41%	1939
September	1st to 10th	Night	18% 7% 3 3 3 2 4 5% 6% 7% 41%	1800
	11th to 20th	Night	21% 8% 2 5% 4 2 3 3 4 8% 40%	1800
	21st to end	Night	22% 9% 3 6% 5% 2 4 3 5% 6% 37%	2068
October	1st to 10th	Night	20% 5% 2 5% 4 3 4 4 6% 8% 39%	2160
	11th to 20th	Night	23% 6% 2 4 5% 3 4 4 6% 7% 37%	2160
	21st to end	Night	26% 9% 2 5% 5% 3 4 4 5% 6% 31%	2434
November	1st to 10th	Night	23% 9% 3 6% 5% 3 3 4 5% 5% 33%	2474
	11th to 20th	Night	23% 9% 3 6% 6% 3 5% 5% 6% 6% 29%	2660
	21st to end	Night	21% 10% 4 6% 5% 3 4 4 5% 8% 30%	2660
December	1st to 10th	Night	27% 12% 4 7% 5% 3 3 4 5% 5% 26%	2660
	11th to 20th	Night	34% 9% 3 6% 5% 3 3 3 3 5% 25%	3293
	21st to end	Night	28% 10% 4 10% 5% 3 4 4 4 5% 24%	4884

Transparency (when cloud cover <= 30%)
Color Meanings: Too cloudy to forecast Poor Below Average Average Above average Transparent
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	59% 5% 12% 17% 7% 1	1517
	11th to 20th	Day	61% 3 10% 18% 7% 1	1481
	21st to end	Day	52% 4 9% 23% 12% 1	1750
February	1st to 10th	Day	58% 4 10% 15% 12% 1	1620
	11th to 20th	Day	57% 4 11% 18% 8% 2	1581
	21st to end	Day	50% 4 10% 21% 12% 3	1417
March	1st to 10th	Day	55% 3 8% 19% 12% 2	1890
	11th to 20th	Day	53% 4 11% 20% 11% 2	1980
	21st to end	Day	56% 4 8% 19% 12% 2	2227
April	1st to 10th	Day	56% 4 8% 16% 12% 3	2160
	11th to 20th	Day	53% 4 8% 20% 14% 1	2134
	21st to end	Day	57% 3 11% 19% 10% 1	2322
May	1st to 10th	Day	61% 3 10% 16% 9% 1	2474
	11th to 20th	Day	58% 3 9% 21% 8% 1	2482
	21st to end	Day	60% 4 10% 18% 8% 1	2724
June	1st to 10th	Day	63% 5% 11% 16% 5%	2520
	11th to 20th	Day	56% 3 11% 19% 10% 1	2520
	21st to end	Day	69% 3 7% 13% 7%	2520
July	1st to 10th	Day	55% 4 14% 18% 8% 1	2450
	11th to 20th	Day	60% 3 13% 17% 6%	2444
	21st to end	Day	62% 4 11% 17% 5% 1	2592
August	1st to 10th	Day	51% 4 14% 23% 8% 1	2337
	11th to 20th	Day	49% 5% 16% 22% 7%	2304
	21st to end	Day	46% 3 15% 24% 11% 1	2415
September	1st to 10th	Day	46% 4 12% 24% 13% 2	2160
	11th to 20th	Day	45% 4 12% 25% 13% 1	2160
	21st to end	Day	48% 4 9% 25% 15%	1888
October	1st to 10th	Day	48% 4 11% 26% 11% 1	1800
	11th to 20th	Day	49% 4 15% 23% 9%	1800
	21st to end	Day	55% 3 12% 20% 9%	1922
November	1st to 10th	Day	53% 4 11% 21% 9% 1	1599
	11th to 20th	Day	53% 4 10% 20% 11% 1	1520
	21st to end	Day	52% 5% 14% 19% 9% 1	1520
December	1st to 10th	Day	61% 3 11% 19% 5%	1520
	11th to 20th	Day	64% 4 9% 16% 7%	1905
	21st to end	Day	60% 2 17% 14% 6% 1	2783
January	1st to 10th	Night	58% 4 12% 20% 5%	2649
	11th to 20th	Night	59% 4 13% 17% 6% 1	2601
	21st to end	Night	55% 3 11% 23% 8%	2601
February	1st to 10th	Night	59% 3 11% 15% 11% 1	2340
	11th to 20th	Night	59% 3 11% 17% 8% 2	2276
	21st to end	Night	54% 3 10% 22% 10% 2	1838
March	1st to 10th	Night	58% 3 10% 17% 11% 1	2066
	11th to 20th	Night	51% 4 11% 20% 12% 2	1980
	21st to end	Night	54% 3 9% 21% 11% 3	2128
April	1st to 10th	Night	58% 4 9% 16% 11% 2	1800
	11th to 20th	Night	53% 4 8% 20% 13% 2	1776
	21st to end	Night	56% 4 9% 19% 11% 1	1635
May	1st to 10th	Night	61% 2 8% 21% 8% 1	1485
	11th to 20th	Night	56% 2 9% 23% 9%	1417
	21st to end	Night	57% 4 13% 18% 7% 1	1551
June	1st to 10th	Night	62% 3 9% 20% 7%	1440
	11th to 20th	Night	56% 3 10% 17% 14%	1440
	21st to end	Night	70% 2 7% 14% 6% 1	1440
July	1st to 10th	Night	57% 5% 14% 17% 7%	1401
	11th to 20th	Night	64% 4 9% 16% 7%	1392
	21st to end	Night	63% 4 12% 16% 5%	1486
August	1st to 10th	Night	55% 3 13% 23% 6%	1573
	11th to 20th	Night	53% 4 16% 20% 7%	1596
	21st to end	Night	43% 4 15% 26% 11%	1939
September	1st to 10th	Night	45% 4 12% 27% 12% 1	1800
	11th to 20th	Night	45% 3 10% 26% 15% 1	1800
	21st to end	Night	50% 3 8% 26% 12% 1	2068
October	1st to 10th	Night	43% 3 13% 27% 12% 1	2160
	11th to 20th	Night	46% 3 13% 30% 8%	2160
	21st to end	Night	54% 3 12% 20% 10%	2434
November	1st to 10th	Night	52% 4 13% 20% 10%	2474
	11th to 20th	Night	54% 3 12% 19% 12%	2660
	21st to end	Night	54% 3 15% 19% 8%	2660
December	1st to 10th	Night	61% 3 11% 18% 6%	2660
	11th to 20th	Night	64% 3 8% 17% 8%	3295
	21st to end	Night	63% 2 13% 17% 5%	4884

Seeing (when cloud cover <= 80%)
Color Meanings: Too cloudy to forecast Bad 1/5 Poor 2/5 Average 3/5 Good 4/5 Excellent 5/5
Month	Days in Month		Occurrence of each Forecast	Data Points
January	1st to 10th	Day	25% 19% 34% 18% 4	370
	11th to 20th	Day	27% 16% 35% 16% 5%	356
	21st to end	Day	21% 16% 38% 21% 5%	374
February	1st to 10th	Day	30% 19% 32% 17% 2	340
	11th to 20th	Day	27% 20% 33% 18% 2	336
	21st to end	Day	16% 17% 44% 17% 5%	280
March	1st to 10th	Day	22% 17% 42% 16% 3	380
	11th to 20th	Day	21% 18% 34% 21% 5%	420
	21st to end	Day	24% 15% 35% 17% 7% 1	462
April	1st to 10th	Day	33% 16% 32% 16% 3	420
	11th to 20th	Day	28% 11% 39% 15% 5% 1	412
	21st to end	Day	30% 8% 28% 26% 7% 2	420
May	1st to 10th	Day	34% 8% 30% 20% 6% 2	557
	11th to 20th	Day	29% 6% 30% 27% 6% 2	624
	21st to end	Day	34% 8% 26% 24% 7% 1	680
June	1st to 10th	Day	36% 5% 24% 25% 9% 1	630
	11th to 20th	Day	29% 7% 24% 30% 9% 1	630
	21st to end	Day	42% 4 18% 25% 9% 2	630
July	1st to 10th	Day	32% 4 21% 30% 12% 1	620
	11th to 20th	Day	35% 2 19% 28% 14% 1	618
	21st to end	Day	35% 4 17% 31% 12% 2	685
August	1st to 10th	Day	23% 4 25% 32% 13% 3	470
	11th to 20th	Day	29% 4 23% 27% 12% 4	439
	21st to end	Day	24% 5% 25% 28% 14% 4	495
September	1st to 10th	Day	21% 6% 27% 31% 13% 2	450
	11th to 20th	Day	27% 9% 27% 25% 10% 2	450
	21st to end	Day	24% 6% 28% 26% 13% 2	392
October	1st to 10th	Day	23% 7% 31% 24% 14% 3	360
	11th to 20th	Day	22% 11% 30% 21% 14% 2	360
	21st to end	Day	27% 13% 35% 16% 8% 2	396
November	1st to 10th	Day	23% 15% 30% 23% 7% 2	365
	11th to 20th	Day	27% 17% 30% 20% 5% 1	370
	21st to end	Day	24% 18% 36% 16% 5% 1	370
December	1st to 10th	Day	31% 16% 30% 20% 3	370
	11th to 20th	Day	33% 22% 30% 14% 1	370
	21st to end	Day	25% 19% 31% 19% 4 1	407
January	1st to 10th	Night	29% 17% 35% 17% 3	850
	11th to 20th	Night	30% 17% 33% 16% 3	829
	21st to end	Night	23% 17% 38% 17% 4	804
February	1st to 10th	Night	29% 17% 33% 20% 2	720
	11th to 20th	Night	25% 20% 37% 16% 2	703
	21st to end	Night	19% 15% 36% 24% 6%	592
March	1st to 10th	Night	22% 18% 38% 19% 3	720
	11th to 20th	Night	25% 13% 29% 23% 9% 1	720
	21st to end	Night	25% 13% 31% 24% 7%	742
April	1st to 10th	Night	34% 11% 27% 23% 5%	540
	11th to 20th	Night	29% 9% 31% 23% 6% 1	534
	21st to end	Night	34% 5% 26% 25% 9% 1	540
May	1st to 10th	Night	36% 6% 25% 23% 8% 2	540
	11th to 20th	Night	30% 6% 21% 29% 11% 2	532
	21st to end	Night	32% 8% 24% 27% 8% 1	583
June	1st to 10th	Night	39% 5% 19% 29% 7% 1	540
	11th to 20th	Night	33% 5% 17% 34% 10% 1	540
	21st to end	Night	41% 5% 16% 25% 12% 2	540
July	1st to 10th	Night	32% 3 15% 37% 13% 1	526
	11th to 20th	Night	35% 3 13% 32% 16%	522
	21st to end	Night	38% 4 13% 28% 16% 1	590
August	1st to 10th	Night	27% 2 13% 37% 18% 3	538
	11th to 20th	Night	28% 3 16% 34% 19% 1	532
	21st to end	Night	25% 3 17% 31% 20% 3	594
September	1st to 10th	Night	21% 6% 23% 31% 16% 2	540
	11th to 20th	Night	26% 6% 24% 27% 16% 2	540
	21st to end	Night	28% 6% 25% 30% 10% 2	694
October	1st to 10th	Night	21% 7% 27% 32% 11% 2	720
	11th to 20th	Night	25% 9% 29% 26% 9% 2	720
	21st to end	Night	30% 11% 33% 21% 5%	821
November	1st to 10th	Night	27% 12% 30% 23% 6% 2	830
	11th to 20th	Night	28% 15% 31% 19% 7%	850
	21st to end	Night	27% 16% 33% 18% 5%	850
December	1st to 10th	Night	32% 14% 32% 17% 4	850
	11th to 20th	Night	32% 18% 34% 14% 3	850
	21st to end	Night	29% 17% 33% 17% 4	935

Page generated at 2024-01-13 10:37:58. Version ac07

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