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 2024-12-09.

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% 11% 4 8% 5% 4 4 3 5% 6% 27%	101876
	Night	23% 11% 3 8% 5% 4 4 3 5% 6% 29%	98004
Transparency	Day	31% 46% 6% 10% 5% 1	105427
	Night	31% 46% 6% 11% 5%	102546
Seeing	Day	28% 10% 28% 23% 8% 1	17584
	Night	29% 11% 27% 24% 8% 1	25254

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	15% 11% 5% 10% 6% 5% 6% 4 5% 5% 29%	2526
	11th to 20th	Day	16% 16% 5% 11% 7% 5% 4 3 5% 5% 24%	2530
	21st to end	Day	17% 11% 4 9% 6% 5% 5% 4 5% 7% 28%	3066
February	1st to 10th	Day	21% 14% 4 9% 5% 5% 4 3 5% 4 26%	1710
	11th to 20th	Day	18% 14% 5% 8% 6% 4 4 3 4 5% 28%	1663
	21st to end	Day	14% 17% 4 8% 6% 4 4 3 4 5% 33%	1503
March	1st to 10th	Day	24% 15% 4 8% 4 4 3 2 4 5% 27%	3274
	11th to 20th	Day	16% 21% 6% 10% 7% 4 4 3 4 5% 21%	3480
	21st to end	Day	32% 13% 3 10% 5% 4 3 2 3 4 20%	3906
April	1st to 10th	Day	27% 13% 4 6% 4 5% 3 4 4 4 25%	2280
	11th to 20th	Day	25% 11% 3 6% 5% 4 3 3 4 6% 29%	2254
	21st to end	Day	25% 12% 3 6% 4 4 4 4 4 5% 29%	2451
May	1st to 10th	Day	28% 14% 4 8% 5% 5% 4 3 4 5% 21%	4351
	11th to 20th	Day	25% 12% 3 8% 5% 4 4 3 4 6% 27%	4398
	21st to end	Day	22% 12% 4 8% 5% 4 4 4 6% 7% 25%	4836
June	1st to 10th	Day	29% 10% 3 8% 4 3 4 4 6% 7% 21%	2660
	11th to 20th	Day	24% 9% 3 7% 5% 4 4 3 4 6% 31%	2660
	21st to end	Day	33% 10% 3 7% 4 4 4 3 5% 5% 21%	2660
July	1st to 10th	Day	26% 10% 4 6% 4 4 4 4 5% 7% 26%	4440
	11th to 20th	Day	24% 11% 3 8% 4 4 4 3 6% 8% 25%	4440
	21st to end	Day	23% 9% 3 7% 4 4 4 3 5% 8% 29%	4815
August	1st to 10th	Day	27% 11% 4 8% 4 4 5% 3 5% 6% 24%	4143
	11th to 20th	Day	21% 7% 3 7% 5% 5% 5% 4 7% 8% 29%	4045
	21st to end	Day	12% 6% 2 5% 4 4 5% 4 6% 7% 44%	4247
September	1st to 10th	Day	20% 6% 2 6% 6% 3 4 3 6% 7% 36%	2280
	11th to 20th	Day	21% 8% 3 6% 4 4 3 4 5% 7% 36%	2280
	21st to end	Day	19% 7% 3 7% 4 4 5% 4 5% 7% 35%	1992
October	1st to 10th	Day	19% 8% 3 6% 5% 5% 4 4 6% 7% 33%	1900
	11th to 20th	Day	22% 7% 3 6% 4 5% 5% 4 5% 7% 34%	1900
	21st to end	Day	23% 10% 3 7% 6% 4 3 4 5% 8% 29%	2028
November	1st to 10th	Day	24% 9% 3 7% 4 4 4 3 5% 7% 29%	1685
	11th to 20th	Day	25% 10% 3 8% 5% 4 3 4 5% 6% 28%	1600
	21st to end	Day	19% 13% 4 8% 5% 5% 3 4 7% 6% 26%	1600
December	1st to 10th	Day	25% 14% 4 8% 4 4 4 3 4 5% 25%	1584
	11th to 20th	Day	31% 13% 3 7% 5% 4 4 3 4 5% 21%	1906
	21st to end	Day	23% 11% 6% 11% 4 4 4 3 4 5% 26%	2783
January	1st to 10th	Night	15% 10% 3 9% 5% 5% 4 3 5% 7% 34%	4429
	11th to 20th	Night	21% 12% 4 13% 6% 5% 5% 3 4 5% 23%	4440
	21st to end	Night	17% 11% 5% 10% 6% 5% 4 3 5% 7% 28%	4587
February	1st to 10th	Night	22% 11% 4 10% 6% 5% 5% 3 5% 6% 25%	2470
	11th to 20th	Night	19% 12% 4 9% 6% 4 5% 3 5% 6% 27%	2403
	21st to end	Night	13% 15% 5% 9% 6% 5% 4 3 6% 6% 29%	1950
March	1st to 10th	Night	22% 13% 5% 8% 6% 5% 4 3 4 5% 24%	3548
	11th to 20th	Night	23% 15% 5% 9% 5% 4 3 3 5% 5% 23%	3479
	21st to end	Night	31% 11% 5% 10% 5% 4 3 2 3 3 23%	3725
April	1st to 10th	Night	27% 12% 3 6% 5% 4 3 3 5% 5% 27%	1900
	11th to 20th	Night	22% 10% 2 7% 4 4 4 3 4 7% 32%	1876
	21st to end	Night	26% 10% 2 6% 4 4 3 4 4 6% 30%	1725
May	1st to 10th	Night	26% 19% 5% 8% 4 4 3 3 4 5% 20%	2596
	11th to 20th	Night	27% 10% 3 7% 4 4 4 3 4 6% 28%	2506
	21st to end	Night	25% 14% 4 8% 3 4 3 4 5% 7% 24%	2749
June	1st to 10th	Night	31% 11% 3 7% 4 4 3 3 4 6% 24%	1520
	11th to 20th	Night	24% 10% 2 6% 4 4 4 3 4 8% 32%	1520
	21st to end	Night	33% 13% 3 6% 5% 3 3 3 4 4 22%	1520
July	1st to 10th	Night	27% 11% 4 9% 4 4 4 3 5% 7% 22%	2530
	11th to 20th	Night	27% 15% 3 8% 4 4 3 3 4 5% 24%	2530
	21st to end	Night	26% 9% 3 5% 4 5% 4 3 4 6% 32%	2750
August	1st to 10th	Night	31% 10% 2 5% 4 3 3 3 5% 5% 29%	2784
	11th to 20th	Night	19% 12% 3 7% 5% 3 5% 4 5% 8% 29%	2782
	21st to end	Night	16% 5% 2 4 3 3 4 3 5% 5% 50%	3407
September	1st to 10th	Night	19% 7% 2 4 3 3 4 3 6% 7% 42%	1900
	11th to 20th	Night	20% 8% 1 5% 3 3 3 3 4 7% 41%	1900
	21st to end	Night	21% 9% 3 6% 4 3 4 3 5% 6% 37%	2184
October	1st to 10th	Night	20% 6% 2 5% 3 4 4 3 6% 7% 39%	2280
	11th to 20th	Night	22% 6% 1 5% 4 3 4 3 6% 7% 38%	2280
	21st to end	Night	26% 9% 2 6% 4 4 4 3 4 6% 32%	2570
November	1st to 10th	Night	22% 9% 3 7% 5% 4 3 3 5% 5% 33%	2608
	11th to 20th	Night	23% 10% 3 7% 5% 4 4 4 6% 6% 28%	2800
	21st to end	Night	22% 13% 3 7% 5% 4 4 3 5% 7% 29%	2800
December	1st to 10th	Night	26% 13% 3 8% 4 3 3 4 5% 5% 27%	2779
	11th to 20th	Night	34% 10% 3 7% 4 3 3 3 4 5% 24%	3293
	21st to end	Night	27% 10% 3 10% 5% 4 4 3 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	31% 36% 11% 15% 6% 1	2527
	11th to 20th	Day	35% 36% 4 18% 7% 1	2530
	21st to end	Day	35% 39% 7% 9% 9% 1	3066
February	1st to 10th	Day	23% 64% 3 5% 4 1	1710
	11th to 20th	Day	22% 63% 3 6% 5% 1	1671
	21st to end	Day	19% 64% 3 6% 6% 2	1503
March	1st to 10th	Day	38% 39% 5% 9% 7% 1	3278
	11th to 20th	Day	39% 39% 7% 10% 4	3480
	21st to end	Day	46% 39% 3 5% 5% 2	3906
April	1st to 10th	Day	22% 65% 3 5% 5% 2	2280
	11th to 20th	Day	21% 65% 4 7% 3	2254
	21st to end	Day	20% 66% 4 5% 4 1	2451
May	1st to 10th	Day	41% 39% 9% 9% 2	4366
	11th to 20th	Day	38% 39% 8% 11% 4	4402
	21st to end	Day	39% 40% 10% 8% 2	4836
June	1st to 10th	Day	20% 66% 3 7% 3	2660
	11th to 20th	Day	18% 65% 5% 7% 3 1	2660
	21st to end	Day	24% 63% 3 6% 4	2660
July	1st to 10th	Day	41% 40% 5% 7% 7%	4370
	11th to 20th	Day	42% 38% 4 10% 5%	4364
	21st to end	Day	34% 39% 8% 12% 7%	4662
August	1st to 10th	Day	41% 39% 6% 10% 4	4129
	11th to 20th	Day	32% 41% 10% 15% 2	4084
	21st to end	Day	23% 38% 8% 19% 12%	4247
September	1st to 10th	Day	18% 60% 6% 9% 5% 1	2280
	11th to 20th	Day	21% 59% 5% 11% 4	2280
	21st to end	Day	17% 60% 4 12% 6%	1992
October	1st to 10th	Day	32% 38% 7% 15% 7%	3160
	11th to 20th	Day	20% 38% 7% 21% 14%	3140
	21st to end	Day	28% 37% 11% 14% 8% 2	3322
November	1st to 10th	Day	26% 56% 6% 8% 4	1685
	11th to 20th	Day	28% 57% 4 7% 3 1	1600
	21st to end	Day	27% 57% 5% 6% 5% 1	1600
December	1st to 10th	Day	26% 58% 4 9% 3	1584
	11th to 20th	Day	36% 48% 5% 6% 5%	1905
	21st to end	Day	40% 36% 13% 7% 3 1	2783
January	1st to 10th	Night	28% 36% 14% 18% 4	4429
	11th to 20th	Night	41% 36% 5% 12% 6%	4440
	21st to end	Night	36% 39% 6% 13% 6%	4587
February	1st to 10th	Night	24% 65% 3 4 4 1	2470
	11th to 20th	Night	22% 64% 3 7% 5%	2406
	21st to end	Night	19% 64% 3 8% 5% 1	1950
March	1st to 10th	Night	37% 40% 4 12% 6% 2	3557
	11th to 20th	Night	40% 40% 5% 10% 5%	3480
	21st to end	Night	45% 39% 3 10% 4	3725
April	1st to 10th	Night	22% 65% 3 4 5% 1	1900
	11th to 20th	Night	17% 66% 4 8% 4 1	1876
	21st to end	Night	21% 65% 2 7% 5% 1	1725
May	1st to 10th	Night	45% 39% 6% 7% 3 1	2601
	11th to 20th	Night	37% 39% 7% 12% 3	2507
	21st to end	Night	41% 39% 8% 9% 3	2750
June	1st to 10th	Night	22% 65% 4 6% 3	1520
	11th to 20th	Night	18% 65% 4 8% 5%	1520
	21st to end	Night	23% 64% 3 7% 3	1520
July	1st to 10th	Night	47% 36% 4 7% 5% 2	2491
	11th to 20th	Night	47% 36% 5% 7% 5%	2482
	21st to end	Night	34% 37% 6% 14% 8% 1	2663
August	1st to 10th	Night	38% 38% 8% 13% 2	2773
	11th to 20th	Night	33% 40% 11% 14% 2	2809
	21st to end	Night	20% 38% 9% 21% 12%	3406
September	1st to 10th	Night	17% 60% 5% 12% 5% 1	1900
	11th to 20th	Night	19% 60% 4 12% 4	1900
	21st to end	Night	17% 60% 4 14% 4	2184
October	1st to 10th	Night	33% 39% 7% 14% 6% 1	3800
	11th to 20th	Night	18% 37% 6% 22% 17%	3779
	21st to end	Night	26% 37% 10% 17% 10%	4230
November	1st to 10th	Night	24% 57% 5% 9% 4	2608
	11th to 20th	Night	25% 58% 6% 6% 6% 1	2800
	21st to end	Night	25% 57% 6% 6% 5%	2800
December	1st to 10th	Night	26% 58% 4 8% 3	2779
	11th to 20th	Night	34% 48% 4 8% 6%	3295
	21st to end	Night	42% 36% 9% 11% 3	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% 18% 34% 16% 5%	370
	21st to end	Day	22% 15% 37% 21% 5%	407
February	1st to 10th	Day	29% 19% 31% 17% 4 1	370
	11th to 20th	Day	25% 20% 34% 18% 2 1	366
	21st to end	Day	19% 16% 42% 18% 5%	307
March	1st to 10th	Day	23% 17% 40% 16% 3	415
	11th to 20th	Day	22% 17% 34% 21% 5%	460
	21st to end	Day	27% 16% 34% 16% 6% 1	506
April	1st to 10th	Day	32% 16% 33% 17% 3	460
	11th to 20th	Day	29% 11% 39% 15% 6% 1	452
	21st to end	Day	28% 10% 29% 25% 7% 2	460
May	1st to 10th	Day	34% 8% 30% 20% 6% 2	605
	11th to 20th	Day	29% 6% 29% 27% 7% 2	674
	21st to end	Day	32% 7% 27% 26% 7% 1	735
June	1st to 10th	Day	35% 6% 25% 25% 9% 1	680
	11th to 20th	Day	28% 6% 24% 31% 9% 1	680
	21st to end	Day	44% 4 17% 25% 9% 2	680
July	1st to 10th	Day	33% 3 21% 30% 12% 1	670
	11th to 20th	Day	35% 2 18% 29% 14% 1	668
	21st to end	Day	34% 4 17% 31% 13% 2	740
August	1st to 10th	Day	24% 4 24% 32% 14% 2	511
	11th to 20th	Day	28% 4 22% 28% 15% 4	479
	21st to end	Day	23% 5% 24% 29% 14% 4	539
September	1st to 10th	Day	21% 6% 27% 31% 13% 2	490
	11th to 20th	Day	25% 9% 25% 26% 12% 3	490
	21st to end	Day	23% 7% 26% 28% 14% 2	425
October	1st to 10th	Day	22% 7% 30% 25% 14% 3	390
	11th to 20th	Day	21% 12% 29% 22% 14% 2	390
	21st to end	Day	26% 12% 34% 17% 8% 1	429
November	1st to 10th	Day	22% 14% 31% 24% 7% 2	395
	11th to 20th	Day	29% 18% 29% 19% 5% 1	400
	21st to end	Day	26% 18% 35% 17% 5% 1	400
December	1st to 10th	Day	30% 16% 29% 21% 3 1	394
	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	850
	21st to end	Night	23% 17% 38% 18% 4	850
February	1st to 10th	Night	29% 16% 32% 20% 3	760
	11th to 20th	Night	25% 20% 37% 16% 2	743
	21st to end	Night	19% 15% 36% 23% 6%	628
March	1st to 10th	Night	22% 17% 38% 19% 3	760
	11th to 20th	Night	26% 13% 29% 23% 9% 1	760
	21st to end	Night	27% 13% 30% 23% 7%	783
April	1st to 10th	Night	33% 11% 27% 23% 5%	570
	11th to 20th	Night	28% 9% 31% 24% 7% 1	564
	21st to end	Night	33% 6% 26% 26% 8% 1	570
May	1st to 10th	Night	36% 6% 24% 23% 8% 2	570
	11th to 20th	Night	30% 6% 20% 29% 11% 3	562
	21st to end	Night	33% 7% 24% 28% 8% 1	616
June	1st to 10th	Night	39% 5% 20% 29% 7% 1	570
	11th to 20th	Night	32% 5% 17% 35% 11% 1	570
	21st to end	Night	41% 5% 16% 26% 12% 2	570
July	1st to 10th	Night	33% 3 14% 36% 13% 1	556
	11th to 20th	Night	36% 3 13% 31% 16% 1	552
	21st to end	Night	37% 4 12% 28% 17% 1	623
August	1st to 10th	Night	29% 2 12% 37% 17% 3	568
	11th to 20th	Night	28% 3 15% 33% 20% 1	562
	21st to end	Night	24% 3 17% 32% 21% 3	627
September	1st to 10th	Night	22% 5% 23% 31% 16% 2	570
	11th to 20th	Night	25% 6% 22% 28% 17% 2	570
	21st to end	Night	27% 6% 25% 30% 11% 2	733
October	1st to 10th	Night	22% 7% 27% 32% 11% 2	760
	11th to 20th	Night	25% 9% 30% 26% 9% 1	760
	21st to end	Night	29% 11% 32% 22% 5%	869
November	1st to 10th	Night	26% 11% 32% 24% 6% 2	880
	11th to 20th	Night	29% 16% 29% 19% 7%	900
	21st to end	Night	28% 16% 32% 18% 5%	900
December	1st to 10th	Night	31% 14% 32% 18% 5%	893
	11th to 20th	Night	32% 18% 34% 14% 3	850
	21st to end	Night	29% 17% 33% 17% 4	935

Page generated at 2024-12-06 04:54:47. Version ac07

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