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 2026-04-02.

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	22% 12% 4 8% 5% 4 4 3 5% 6% 28%	131828
	Night	23% 12% 3 8% 4 4 4 3 5% 6% 29%	130221
Transparency	Day	37% 37% 7% 12% 6% 1	135361
	Night	37% 36% 6% 13% 7% 1	134780
Seeing	Day	28% 10% 28% 24% 8% 1	19341
	Night	28% 11% 27% 24% 8% 1	27116

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	13% 15% 5% 11% 6% 5% 5% 4 4 6% 26%	4690
	11th to 20th	Day	20% 16% 9% 11% 6% 5% 3 3 4 5% 19%	4681
	21st to end	Day	14% 10% 4 8% 5% 5% 5% 5% 6% 7% 31%	5697
February	1st to 10th	Day	19% 14% 4 10% 5% 5% 4 3 5% 4 26%	1890
	11th to 20th	Day	17% 14% 5% 9% 6% 5% 4 3 4 5% 28%	1843
	21st to end	Day	14% 16% 4 8% 6% 4 4 3 4 5% 33%	1657
March	1st to 10th	Day	22% 15% 5% 11% 4 4 3 2 3 4 26%	4809
	11th to 20th	Day	18% 18% 5% 9% 5% 4 3 3 4 5% 26%	5090
	21st to end	Day	29% 14% 3 10% 5% 4 3 3 4 5% 20%	5722
April	1st to 10th	Day	27% 13% 4 6% 4 5% 3 4 4 4 25%	2412
	11th to 20th	Day	24% 11% 3 7% 5% 4 3 3 4 6% 29%	2374
	21st to end	Day	25% 12% 3 6% 4 4 4 4 5% 5% 28%	2580
May	1st to 10th	Day	29% 15% 3 8% 5% 5% 4 3 4 5% 19%	6243
	11th to 20th	Day	25% 12% 3 8% 5% 4 4 3 4 6% 27%	6318
	21st to end	Day	23% 14% 4 8% 4 4 4 3 5% 6% 28%	6948
June	1st to 10th	Day	28% 10% 3 7% 4 4 4 4 6% 7% 22%	2800
	11th to 20th	Day	24% 9% 3 7% 5% 4 4 3 4 7% 31%	2800
	21st to end	Day	33% 10% 3 7% 4 4 4 3 5% 5% 22%	2800
July	1st to 10th	Day	24% 10% 4 7% 4 5% 5% 4 6% 8% 22%	6360
	11th to 20th	Day	23% 11% 3 8% 4 4 4 3 5% 7% 27%	6360
	21st to end	Day	18% 8% 3 6% 4 4 4 4 6% 9% 36%	6927
August	1st to 10th	Day	26% 11% 3 8% 4 4 4 3 5% 6% 25%	4274
	11th to 20th	Day	21% 7% 3 7% 5% 4 5% 4 7% 8% 30%	4175
	21st to end	Day	12% 6% 2 5% 4 4 5% 4 6% 7% 44%	4381
September	1st to 10th	Day	19% 7% 2 6% 6% 4 4 3 6% 7% 36%	2400
	11th to 20th	Day	20% 8% 3 6% 4 4 3 3 6% 7% 37%	2400
	21st to end	Day	19% 7% 3 7% 4 4 5% 4 5% 7% 36%	2096
October	1st to 10th	Day	18% 8% 2 6% 5% 5% 4 4 5% 7% 35%	2000
	11th to 20th	Day	22% 7% 3 6% 4 5% 5% 4 5% 7% 33%	2000
	21st to end	Day	23% 10% 3 7% 6% 4 3 4 5% 7% 28%	2134
November	1st to 10th	Day	24% 9% 3 7% 4 4 4 3 5% 7% 29%	1771
	11th to 20th	Day	26% 11% 3 8% 4 4 4 4 5% 5% 27%	1680
	21st to end	Day	19% 13% 4 8% 5% 5% 3 4 6% 6% 26%	1680
December	1st to 10th	Day	20% 12% 4 9% 5% 4 4 3 4 5% 29%	2690
	11th to 20th	Day	30% 12% 2 7% 4 3 3 2 3 4 29%	3076
	21st to end	Day	20% 11% 6% 11% 4 3 3 3 4 5% 29%	4070
January	1st to 10th	Night	15% 14% 4 9% 6% 5% 5% 3 5% 6% 28%	8234
	11th to 20th	Night	23% 13% 6% 14% 6% 5% 4 3 4 4 18%	8234
	21st to end	Night	12% 12% 4 9% 6% 5% 5% 4 5% 7% 31%	8483
February	1st to 10th	Night	21% 11% 4 11% 5% 5% 5% 3 5% 5% 25%	2730
	11th to 20th	Night	18% 12% 4 9% 6% 4 4 3 5% 6% 28%	2663
	21st to end	Night	13% 15% 5% 9% 6% 5% 4 4 6% 6% 28%	2148
March	1st to 10th	Night	25% 12% 5% 9% 6% 5% 5% 3 4 5% 22%	5233
	11th to 20th	Night	24% 14% 5% 7% 4 3 3 3 4 5% 28%	5089
	21st to end	Night	31% 12% 4 10% 4 3 3 2 3 4 23%	5451
April	1st to 10th	Night	27% 12% 3 6% 5% 4 3 3 5% 5% 26%	2011
	11th to 20th	Night	22% 11% 2 7% 4 4 4 3 4 6% 32%	1976
	21st to end	Night	26% 10% 2 6% 4 4 3 4 4 7% 30%	1816
May	1st to 10th	Night	31% 17% 4 7% 4 3 3 3 4 5% 18%	3712
	11th to 20th	Night	28% 13% 3 6% 4 3 3 3 4 6% 28%	3596
	21st to end	Night	21% 17% 3 7% 3 3 3 3 5% 7% 27%	3948
June	1st to 10th	Night	30% 11% 3 7% 4 4 3 3 4 6% 25%	1600
	11th to 20th	Night	24% 10% 2 6% 4 4 4 3 4 8% 32%	1600
	21st to end	Night	33% 12% 3 6% 5% 3 4 2 4 4 22%	1600
July	1st to 10th	Night	26% 11% 4 9% 4 5% 5% 4 5% 7% 21%	3619
	11th to 20th	Night	26% 14% 3 7% 4 4 3 3 4 5% 28%	3620
	21st to end	Night	22% 9% 3 6% 3 4 4 4 5% 8% 32%	3948
August	1st to 10th	Night	30% 10% 2 5% 4 3 3 3 5% 6% 31%	2873
	11th to 20th	Night	19% 12% 3 7% 5% 3 4 4 5% 8% 30%	2872
	21st to end	Night	17% 5% 2 4 3 3 4 3 5% 5% 50%	3515
September	1st to 10th	Night	19% 7% 2 4 2 3 4 3 6% 7% 42%	2000
	11th to 20th	Night	20% 8% 1 5% 3 3 3 3 4 7% 41%	2000
	21st to end	Night	21% 9% 3 6% 4 3 4 3 5% 6% 38%	2300
October	1st to 10th	Night	19% 6% 2 5% 3 4 4 3 6% 7% 41%	2400
	11th to 20th	Night	21% 7% 2 6% 4 3 4 3 6% 7% 37%	2400
	21st to end	Night	26% 9% 2 6% 4 4 4 3 5% 6% 31%	2705
November	1st to 10th	Night	22% 10% 3 7% 5% 4 3 3 5% 5% 33%	2742
	11th to 20th	Night	23% 11% 3 7% 5% 4 4 4 5% 6% 28%	2940
	21st to end	Night	21% 13% 3 7% 5% 4 4 3 5% 7% 29%	2940
December	1st to 10th	Night	19% 11% 4 8% 4 3 3 3 5% 6% 35%	4720
	11th to 20th	Night	29% 10% 3 6% 4 3 3 3 4 5% 30%	5353
	21st to end	Night	25% 10% 3 9% 4 4 4 3 4 5% 29%	7150

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	44% 22% 10% 18% 7%	4691
	11th to 20th	Day	51% 21% 6% 16% 6% 1	4710
	21st to end	Day	38% 23% 6% 13% 16% 4	5697
February	1st to 10th	Day	26% 59% 3 6% 5% 1	1890
	11th to 20th	Day	24% 58% 4 8% 6% 1	1851
	21st to end	Day	21% 58% 3 8% 7% 2	1657
March	1st to 10th	Day	45% 28% 5% 9% 8% 4	4813
	11th to 20th	Day	43% 28% 11% 13% 4	5090
	21st to end	Day	50% 27% 4 12% 6% 1	5722
April	1st to 10th	Day	24% 61% 3 5% 5% 2	2412
	11th to 20th	Day	23% 62% 4 7% 3	2374
	21st to end	Day	22% 63% 4 5% 4 1	2580
May	1st to 10th	Day	51% 28% 7% 11% 3	6255
	11th to 20th	Day	44% 28% 9% 14% 5%	6322
	21st to end	Day	44% 29% 9% 14% 4	6948
June	1st to 10th	Day	21% 63% 4 8% 4	2800
	11th to 20th	Day	19% 62% 6% 8% 4 1	2800
	21st to end	Day	25% 61% 3 6% 5%	2800
July	1st to 10th	Day	49% 31% 7% 7% 6%	6290
	11th to 20th	Day	47% 29% 4 14% 6%	6284
	21st to end	Day	34% 30% 10% 18% 8%	6730
August	1st to 10th	Day	41% 38% 6% 11% 5%	4260
	11th to 20th	Day	32% 40% 10% 16% 3	4214
	21st to end	Day	24% 37% 8% 20% 12%	4381
September	1st to 10th	Day	20% 58% 6% 10% 6% 1	2400
	11th to 20th	Day	22% 57% 6% 11% 5%	2400
	21st to end	Day	17% 58% 5% 13% 7% 1	2096
October	1st to 10th	Day	32% 37% 7% 16% 8%	3260
	11th to 20th	Day	21% 37% 7% 21% 14%	3240
	21st to end	Day	29% 36% 11% 15% 8% 2	3428
November	1st to 10th	Day	27% 54% 6% 9% 5%	1771
	11th to 20th	Day	30% 54% 5% 7% 3 1	1680
	21st to end	Day	28% 55% 6% 6% 5% 1	1680
December	1st to 10th	Day	35% 35% 6% 18% 5%	2690
	11th to 20th	Day	41% 31% 7% 9% 12%	3075
	21st to end	Day	43% 26% 10% 12% 9%	4070
January	1st to 10th	Night	43% 22% 11% 18% 6%	8234
	11th to 20th	Night	55% 21% 5% 14% 5%	8280
	21st to end	Night	39% 24% 5% 15% 16% 2	8483
February	1st to 10th	Night	27% 59% 3 6% 4 1	2730
	11th to 20th	Night	24% 58% 3 9% 6%	2666
	21st to end	Night	22% 59% 3 10% 5% 1	2148
March	1st to 10th	Night	48% 28% 3 10% 9% 2	5242
	11th to 20th	Night	44% 28% 9% 13% 6%	5090
	21st to end	Night	51% 27% 2 13% 5%	5451
April	1st to 10th	Night	24% 61% 4 5% 5% 1	2011
	11th to 20th	Night	19% 63% 4 9% 4 1	1976
	21st to end	Night	22% 62% 3 8% 5% 1	1816
May	1st to 10th	Night	54% 28% 4 9% 4 1	3717
	11th to 20th	Night	45% 28% 7% 14% 5% 1	3597
	21st to end	Night	45% 28% 7% 15% 4	3949
June	1st to 10th	Night	23% 62% 4 7% 5%	1600
	11th to 20th	Night	19% 62% 4 10% 6%	1600
	21st to end	Night	24% 61% 3 8% 4	1600
July	1st to 10th	Night	52% 27% 5% 10% 5% 1	3581
	11th to 20th	Night	50% 27% 5% 12% 6% 1	3572
	21st to end	Night	39% 26% 9% 17% 8%	3831
August	1st to 10th	Night	37% 37% 8% 14% 3	2862
	11th to 20th	Night	33% 39% 11% 14% 2	2899
	21st to end	Night	21% 37% 9% 21% 11%	3514
September	1st to 10th	Night	18% 58% 5% 12% 6% 1	2000
	11th to 20th	Night	20% 57% 4 14% 5%	2000
	21st to end	Night	17% 58% 4 15% 5%	2300
October	1st to 10th	Night	33% 38% 7% 15% 7% 1	3920
	11th to 20th	Night	20% 36% 6% 22% 17%	3899
	21st to end	Night	27% 36% 10% 17% 10%	4365
November	1st to 10th	Night	26% 54% 6% 10% 5%	2742
	11th to 20th	Night	27% 55% 6% 7% 6%	2940
	21st to end	Night	27% 55% 6% 7% 6%	2940
December	1st to 10th	Night	30% 37% 6% 19% 7%	4720
	11th to 20th	Night	38% 32% 6% 13% 10% 1	5355
	21st to end	Night	44% 25% 8% 14% 8%	7150

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	24% 20% 33% 18% 4	430
	11th to 20th	Day	27% 17% 32% 17% 7% 1	430
	21st to end	Day	21% 15% 39% 21% 4	473
February	1st to 10th	Day	28% 17% 32% 18% 4 1	430
	11th to 20th	Day	24% 19% 33% 20% 4	426
	21st to end	Day	19% 15% 41% 19% 5%	355
March	1st to 10th	Day	23% 16% 38% 19% 3	485
	11th to 20th	Day	23% 15% 34% 23% 5%	540
	21st to end	Day	28% 15% 33% 16% 5% 1	594
April	1st to 10th	Day	32% 15% 33% 17% 3	504
	11th to 20th	Day	28% 11% 39% 15% 6% 1	492
	21st to end	Day	29% 9% 29% 26% 6% 1	500
May	1st to 10th	Day	34% 8% 29% 21% 6% 2	653
	11th to 20th	Day	29% 6% 29% 27% 7% 2	724
	21st to end	Day	32% 7% 25% 27% 7% 1	790
June	1st to 10th	Day	34% 6% 25% 25% 9% 1	730
	11th to 20th	Day	27% 6% 24% 32% 9% 1	730
	21st to end	Day	42% 4 17% 26% 10% 2	730
July	1st to 10th	Day	32% 4 20% 31% 12% 1	720
	11th to 20th	Day	35% 2 18% 30% 14% 1	718
	21st to end	Day	32% 4 16% 33% 13% 2	795
August	1st to 10th	Day	24% 4 22% 33% 14% 3	552
	11th to 20th	Day	27% 4 20% 29% 16% 3	519
	21st to end	Day	23% 5% 24% 30% 14% 4	583
September	1st to 10th	Day	22% 6% 25% 31% 14% 2	530
	11th to 20th	Day	24% 8% 25% 26% 13% 3	530
	21st to end	Day	22% 6% 26% 29% 14% 2	458
October	1st to 10th	Day	21% 7% 30% 25% 15% 3	420
	11th to 20th	Day	21% 11% 28% 23% 15% 2	420
	21st to end	Day	27% 12% 34% 18% 8% 2	462
November	1st to 10th	Day	23% 15% 30% 24% 6% 2	425
	11th to 20th	Day	30% 17% 28% 19% 5% 1	430
	21st to end	Day	26% 17% 33% 19% 5% 1	430
December	1st to 10th	Day	30% 16% 29% 22% 3	430
	11th to 20th	Day	32% 21% 29% 15% 2	430
	21st to end	Day	24% 20% 31% 20% 5% 1	473
January	1st to 10th	Night	27% 17% 35% 18% 3	950
	11th to 20th	Night	30% 17% 31% 17% 4	950
	21st to end	Night	22% 18% 40% 17% 4	940
February	1st to 10th	Night	29% 15% 32% 21% 3	840
	11th to 20th	Night	24% 20% 36% 17% 3	823
	21st to end	Night	20% 14% 36% 24% 6%	692
March	1st to 10th	Night	23% 17% 37% 20% 3	840
	11th to 20th	Night	26% 12% 29% 24% 8% 1	840
	21st to end	Night	28% 12% 31% 23% 6%	865
April	1st to 10th	Night	34% 11% 28% 23% 5%	604
	11th to 20th	Night	29% 9% 30% 24% 7% 1	594
	21st to end	Night	32% 6% 26% 27% 8% 1	600
May	1st to 10th	Night	37% 6% 24% 23% 8% 2	600
	11th to 20th	Night	31% 6% 21% 28% 11% 3	592
	21st to end	Night	32% 7% 23% 29% 9% 1	649
June	1st to 10th	Night	38% 5% 19% 30% 8% 1	600
	11th to 20th	Night	32% 4 17% 36% 11% 1	600
	21st to end	Night	40% 5% 15% 27% 12% 2	600
July	1st to 10th	Night	33% 3 13% 36% 13% 1	586
	11th to 20th	Night	35% 3 12% 31% 17% 1	582
	21st to end	Night	36% 4 12% 29% 17% 1	656
August	1st to 10th	Night	28% 2 12% 37% 19% 3	598
	11th to 20th	Night	27% 3 15% 33% 20% 2	592
	21st to end	Night	24% 2 17% 33% 20% 3	660
September	1st to 10th	Night	23% 5% 22% 31% 17% 2	600
	11th to 20th	Night	24% 6% 22% 28% 18% 2	600
	21st to end	Night	26% 5% 25% 31% 11% 2	772
October	1st to 10th	Night	21% 7% 27% 31% 12% 2	800
	11th to 20th	Night	24% 9% 30% 26% 10% 1	800
	21st to end	Night	30% 10% 32% 22% 5%	916
November	1st to 10th	Night	26% 12% 32% 23% 5% 2	930
	11th to 20th	Night	29% 16% 29% 19% 7%	950
	21st to end	Night	28% 16% 33% 19% 5%	950
December	1st to 10th	Night	30% 14% 32% 18% 5%	950
	11th to 20th	Night	31% 18% 34% 15% 3	950
	21st to end	Night	27% 17% 32% 18% 4	1045

Page generated at 2026-03-30 03:18:44. Version ac07

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