Malone
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Malone clear sky chart from 2005-11-06 to 2024-12-24.

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	18% 12% 4 9% 5% 4 4 4 5% 6% 29%	101926
	Night	18% 14% 5% 10% 5% 4 4 3 4 5% 27%	98205
Transparency	Day	55% 7% 10% 19% 8% 1	105387
	Night	58% 6% 10% 17% 8% 1	102833
Seeing	Day	27% 20% 28% 16% 6% 2	14712
	Night	27% 19% 28% 20% 7% 1	23798

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	14% 22% 8% 17% 8% 5% 5% 3 3 4 12%	2517
	11th to 20th	Day	11% 18% 7% 21% 9% 6% 4 3 3 3 14%	2520
	21st to end	Day	13% 23% 8% 14% 6% 6% 4 4 4 5% 13%	2781
February	1st to 10th	Day	15% 21% 5% 15% 7% 5% 4 3 4 4 17%	1710
	11th to 20th	Day	12% 18% 6% 16% 8% 5% 4 4 5% 4 19%	1749
	21st to end	Day	16% 20% 5% 10% 8% 4 5% 4 4 5% 19%	1570
March	1st to 10th	Day	22% 15% 4 10% 6% 4 4 3 4 5% 24%	3116
	11th to 20th	Day	12% 24% 6% 11% 6% 4 4 3 4 4 22%	3341
	21st to end	Day	16% 13% 4 9% 6% 3 4 3 4 5% 35%	4126
April	1st to 10th	Day	20% 18% 4 7% 4 3 3 3 4 5% 29%	2280
	11th to 20th	Day	20% 13% 3 7% 4 4 4 3 3 5% 34%	2254
	21st to end	Day	23% 13% 3 6% 4 4 5% 3 4 5% 30%	2390
May	1st to 10th	Day	22% 11% 4 9% 5% 4 4 4 4 6% 27%	4384
	11th to 20th	Day	19% 11% 3 8% 5% 5% 5% 4 5% 7% 29%	4398
	21st to end	Day	16% 8% 3 7% 4 5% 5% 4 7% 8% 35%	4837
June	1st to 10th	Day	27% 8% 3 6% 5% 5% 5% 4 5% 6% 27%	2660
	11th to 20th	Day	19% 7% 2 6% 6% 4 5% 4 7% 8% 33%	2660
	21st to end	Day	25% 7% 2 7% 4 5% 4 4 6% 7% 29%	2660
July	1st to 10th	Day	14% 6% 3 7% 5% 5% 5% 5% 7% 8% 35%	4440
	11th to 20th	Day	13% 7% 2 6% 5% 5% 6% 5% 8% 8% 35%	4440
	21st to end	Day	14% 7% 2 6% 4 5% 5% 4 7% 9% 38%	4814
August	1st to 10th	Day	18% 9% 3 7% 5% 4 5% 4 7% 8% 30%	4423
	11th to 20th	Day	17% 7% 3 7% 6% 5% 4 4 5% 8% 35%	3919
	21st to end	Day	18% 6% 2 6% 4 4 4 4 6% 9% 37%	4180
September	1st to 10th	Day	16% 7% 2 6% 4 4 5% 4 5% 8% 41%	2280
	11th to 20th	Day	17% 6% 3 6% 3 4 3 3 4 6% 45%	2220
	21st to end	Day	18% 7% 2 7% 4 4 4 4 6% 7% 36%	2090
October	1st to 10th	Day	22% 10% 3 5% 5% 5% 5% 3 4 6% 31%	1933
	11th to 20th	Day	21% 13% 4 9% 5% 4 5% 3 4 6% 27%	1895
	21st to end	Day	26% 17% 3 7% 5% 3 3 3 4 5% 24%	1881
November	1st to 10th	Day	18% 15% 3 9% 5% 5% 4 4 5% 6% 28%	1761
	11th to 20th	Day	16% 17% 5% 9% 5% 5% 4 3 4 4 27%	1715
	21st to end	Day	18% 20% 5% 13% 5% 5% 5% 3 4 4 18%	1600
December	1st to 10th	Day	19% 24% 8% 13% 6% 4 4 3 4 4 11%	1600
	11th to 20th	Day	20% 20% 5% 12% 6% 3 4 4 4 4 18%	1986
	21st to end	Day	21% 20% 6% 13% 5% 5% 3 3 4 4 16%	2796
January	1st to 10th	Night	13% 23% 9% 17% 5% 5% 3 3 3 4 15%	4429
	11th to 20th	Night	11% 18% 9% 21% 9% 6% 5% 3 4 4 12%	4440
	21st to end	Night	16% 22% 7% 14% 6% 6% 3 3 3 4 15%	4870
February	1st to 10th	Night	14% 18% 7% 18% 7% 5% 3 3 4 4 17%	2470
	11th to 20th	Night	13% 17% 6% 14% 8% 7% 4 3 3 4 21%	2316
	21st to end	Night	14% 18% 5% 12% 7% 4 4 3 3 5% 24%	1884
March	1st to 10th	Night	19% 14% 3 8% 6% 4 4 3 4 4 31%	3724
	11th to 20th	Night	16% 22% 6% 11% 5% 4 3 2 3 4 24%	3617
	21st to end	Night	14% 17% 5% 10% 4 3 4 2 3 4 34%	3505
April	1st to 10th	Night	21% 15% 4 9% 6% 4 3 3 4 4 27%	1900
	11th to 20th	Night	22% 12% 4 6% 5% 4 3 3 4 5% 31%	1875
	21st to end	Night	23% 11% 3 7% 4 4 3 2 5% 6% 33%	1788
May	1st to 10th	Night	24% 13% 3 7% 4 4 5% 3 5% 7% 25%	2584
	11th to 20th	Night	22% 9% 2 7% 5% 4 4 4 5% 6% 32%	2495
	21st to end	Night	15% 7% 3 6% 5% 5% 4 3 6% 8% 37%	2738
June	1st to 10th	Night	23% 8% 3 7% 4 4 5% 4 7% 8% 28%	1520
	11th to 20th	Night	18% 7% 2 6% 4 5% 3 4 6% 7% 38%	1520
	21st to end	Night	20% 8% 3 6% 5% 4 4 4 6% 7% 33%	1520
July	1st to 10th	Night	17% 7% 3 7% 5% 6% 5% 4 5% 7% 36%	2520
	11th to 20th	Night	14% 7% 2 6% 4 4 4 4 7% 7% 40%	2520
	21st to end	Night	15% 8% 3 8% 5% 4 5% 4 5% 6% 38%	2739
August	1st to 10th	Night	19% 9% 3 7% 4 4 3 3 5% 6% 36%	2506
	11th to 20th	Night	18% 9% 3 8% 5% 4 4 3 5% 6% 35%	2874
	21st to end	Night	17% 6% 2 5% 4 3 5% 4 6% 8% 40%	3476
September	1st to 10th	Night	17% 6% 2 6% 5% 4 4 4 5% 6% 41%	1900
	11th to 20th	Night	16% 6% 3 5% 3 3 3 3 5% 6% 47%	1959
	21st to end	Night	19% 7% 2 6% 3 4 4 4 5% 7% 39%	2090
October	1st to 10th	Night	22% 9% 3 6% 4 4 4 4 5% 6% 34%	2245
	11th to 20th	Night	21% 12% 3 8% 4 4 4 3 5% 6% 30%	2285
	21st to end	Night	27% 15% 3 8% 4 4 4 3 4 5% 23%	2717
November	1st to 10th	Night	20% 15% 3 8% 5% 4 4 4 5% 5% 27%	2537
	11th to 20th	Night	18% 15% 4 9% 5% 3 4 3 4 5% 27%	2681
	21st to end	Night	19% 19% 7% 11% 5% 5% 3 3 4 5% 19%	2800
December	1st to 10th	Night	19% 24% 9% 12% 6% 5% 3 3 4 3 13%	2800
	11th to 20th	Night	20% 22% 6% 12% 5% 4 4 2 3 4 18%	3428
	21st to end	Night	24% 20% 6% 14% 5% 4 4 2 3 3 15%	4933

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	74% 8% 8% 8% 2	2518
	11th to 20th	Day	74% 7% 7% 7% 4 1	2520
	21st to end	Day	73% 6% 9% 7% 4 1	2781
February	1st to 10th	Day	72% 5% 5% 14% 3 1	1710
	11th to 20th	Day	69% 6% 7% 11% 7% 1	1758
	21st to end	Day	68% 5% 7% 11% 8% 2	1570
March	1st to 10th	Day	62% 6% 8% 14% 8% 1	3119
	11th to 20th	Day	65% 8% 8% 10% 7% 1	3341
	21st to end	Day	52% 6% 6% 18% 17% 2	4126
April	1st to 10th	Day	59% 5% 6% 18% 10% 2	2280
	11th to 20th	Day	55% 6% 5% 18% 14% 2	2254
	21st to end	Day	57% 6% 8% 15% 12% 3	2390
May	1st to 10th	Day	56% 9% 7% 18% 8% 1	4398
	11th to 20th	Day	52% 10% 12% 16% 8% 1	4402
	21st to end	Day	44% 9% 11% 24% 11% 1	4837
June	1st to 10th	Day	57% 7% 9% 17% 10% 1	2660
	11th to 20th	Day	48% 7% 10% 24% 9% 2	2660
	21st to end	Day	54% 8% 10% 19% 8% 1	2660
July	1st to 10th	Day	43% 8% 12% 28% 8%	4370
	11th to 20th	Day	43% 9% 14% 29% 6%	4365
	21st to end	Day	42% 8% 11% 31% 7%	4661
August	1st to 10th	Day	51% 7% 13% 21% 8%	4409
	11th to 20th	Day	48% 7% 15% 25% 5%	3960
	21st to end	Day	43% 7% 17% 22% 11%	4180
September	1st to 10th	Day	41% 8% 12% 27% 12% 1	2280
	11th to 20th	Day	40% 6% 11% 30% 13% 1	2220
	21st to end	Day	45% 9% 12% 24% 10% 1	2090
October	1st to 10th	Day	48% 6% 10% 26% 10%	3206
	11th to 20th	Day	52% 4 14% 21% 8% 1	3123
	21st to end	Day	51% 4 16% 23% 5% 1	3081
November	1st to 10th	Day	57% 8% 10% 18% 7%	1761
	11th to 20th	Day	61% 6% 8% 13% 8% 3	1715
	21st to end	Day	70% 6% 11% 10% 4	1600
December	1st to 10th	Day	77% 6% 7% 7% 2	1600
	11th to 20th	Day	70% 6% 8% 11% 4	1986
	21st to end	Day	73% 5% 7% 11% 4	2796
January	1st to 10th	Night	73% 8% 8% 8% 3	4429
	11th to 20th	Night	75% 9% 6% 6% 3 1	4440
	21st to end	Night	74% 5% 7% 8% 5% 1	4870
February	1st to 10th	Night	72% 5% 6% 10% 6%	2470
	11th to 20th	Night	67% 5% 7% 13% 7%	2318
	21st to end	Night	63% 6% 6% 16% 9% 1	1884
March	1st to 10th	Night	57% 5% 8% 18% 10% 1	3734
	11th to 20th	Night	64% 6% 10% 13% 6% 1	3618
	21st to end	Night	55% 6% 4 17% 16% 2	3505
April	1st to 10th	Night	61% 5% 6% 16% 10% 1	1900
	11th to 20th	Night	57% 5% 8% 17% 11% 1	1875
	21st to end	Night	54% 5% 8% 17% 13% 3	1788
May	1st to 10th	Night	58% 8% 8% 15% 9% 2	2590
	11th to 20th	Night	50% 9% 11% 19% 10% 1	2496
	21st to end	Night	44% 7% 12% 23% 14% 1	2739
June	1st to 10th	Night	52% 7% 13% 17% 10% 1	1520
	11th to 20th	Night	44% 7% 13% 21% 13% 1	1520
	21st to end	Night	50% 7% 13% 22% 9%	1520
July	1st to 10th	Night	48% 6% 12% 22% 12%	2480
	11th to 20th	Night	40% 7% 15% 30% 7%	2472
	21st to end	Night	46% 8% 11% 24% 10%	2651
August	1st to 10th	Night	49% 6% 14% 23% 8%	2496
	11th to 20th	Night	49% 6% 18% 20% 7%	2899
	21st to end	Night	41% 7% 15% 25% 12% 1	3476
September	1st to 10th	Night	43% 8% 11% 26% 12%	1900
	11th to 20th	Night	38% 6% 13% 32% 11%	1959
	21st to end	Night	43% 7% 12% 24% 13% 1	2090
October	1st to 10th	Night	49% 6% 11% 24% 10% 1	3752
	11th to 20th	Night	52% 5% 12% 21% 10% 1	3796
	21st to end	Night	56% 5% 14% 18% 7% 1	4467
November	1st to 10th	Night	58% 7% 11% 15% 8% 1	2537
	11th to 20th	Night	59% 6% 9% 14% 7% 3	2681
	21st to end	Night	68% 6% 10% 11% 4	2800
December	1st to 10th	Night	78% 5% 6% 9% 2	2800
	11th to 20th	Night	72% 6% 6% 11% 5%	3428
	21st to end	Night	75% 6% 6% 9% 4	4933

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	28% 27% 27% 15% 4	180
	11th to 20th	Day	26% 32% 32% 8% 2 1	180
	21st to end	Day	22% 29% 32% 15% 2	202
February	1st to 10th	Day	32% 37% 24% 6%	270
	11th to 20th	Day	29% 33% 33% 4 1	356
	21st to end	Day	34% 28% 28% 9% 1	382
March	1st to 10th	Day	31% 28% 27% 10% 4	460
	11th to 20th	Day	28% 29% 32% 8% 3 1	460
	21st to end	Day	34% 23% 26% 11% 6% 1	506
April	1st to 10th	Day	34% 23% 27% 12% 4	460
	11th to 20th	Day	37% 19% 25% 13% 5% 1	452
	21st to end	Day	36% 19% 27% 11% 6% 1	460
May	1st to 10th	Day	30% 23% 26% 15% 5% 2	463
	11th to 20th	Day	24% 21% 29% 18% 6% 1	487
	21st to end	Day	22% 21% 28% 22% 7%	529
June	1st to 10th	Day	31% 18% 29% 16% 5% 1	490
	11th to 20th	Day	20% 18% 32% 20% 7% 2	490
	21st to end	Day	27% 16% 32% 17% 7% 1	490
July	1st to 10th	Day	16% 14% 35% 23% 10% 1	485
	11th to 20th	Day	20% 16% 32% 24% 7% 2	484
	21st to end	Day	16% 13% 39% 25% 6% 2	532
August	1st to 10th	Day	21% 12% 30% 25% 10% 2	486
	11th to 20th	Day	20% 9% 31% 26% 10% 4	479
	21st to end	Day	21% 17% 28% 22% 9% 4	539
September	1st to 10th	Day	18% 16% 29% 20% 12% 4	490
	11th to 20th	Day	17% 13% 22% 24% 17% 6%	490
	21st to end	Day	19% 15% 30% 22% 11% 3	490
October	1st to 10th	Day	28% 17% 26% 16% 10% 4	490
	11th to 20th	Day	30% 22% 27% 13% 7% 1	487
	21st to end	Day	38% 21% 22% 16% 3	429
November	1st to 10th	Day	36% 18% 26% 14% 6%	395
	11th to 20th	Day	35% 29% 19% 11% 5% 1	315
	21st to end	Day	35% 27% 27% 11% 2	200
December	1st to 10th	Day	35% 25% 27% 11% 3	200
	11th to 20th	Day	32% 35% 24% 8% 2 1	200
	21st to end	Day	33% 28% 25% 11% 1	204
January	1st to 10th	Night	29% 27% 31% 11% 2	760
	11th to 20th	Night	29% 29% 27% 13% 3	760
	21st to end	Night	19% 28% 33% 17% 4	836
February	1st to 10th	Night	24% 28% 33% 13% 2	760
	11th to 20th	Night	25% 29% 31% 13% 1	743
	21st to end	Night	26% 24% 33% 15% 2	628
March	1st to 10th	Night	30% 24% 26% 17% 3	760
	11th to 20th	Night	28% 25% 28% 16% 3	760
	21st to end	Night	29% 22% 25% 18% 6%	836
April	1st to 10th	Night	29% 22% 27% 19% 3	760
	11th to 20th	Night	31% 21% 24% 18% 6%	751
	21st to end	Night	31% 17% 29% 17% 6% 1	648
May	1st to 10th	Night	33% 11% 29% 21% 7%	424
	11th to 20th	Night	25% 13% 30% 25% 7% 1	374
	21st to end	Night	18% 13% 31% 28% 9% 1	411
June	1st to 10th	Night	27% 11% 29% 26% 7% 1	380
	11th to 20th	Night	23% 9% 30% 28% 9% 1	380
	21st to end	Night	24% 11% 29% 27% 9%	380
July	1st to 10th	Night	13% 11% 31% 35% 11%	370
	11th to 20th	Night	12% 9% 30% 35% 14% 1	368
	21st to end	Night	18% 7% 31% 34% 9% 1	416
August	1st to 10th	Night	17% 7% 24% 35% 16%	378
	11th to 20th	Night	18% 7% 24% 32% 18% 2	612
	21st to end	Night	19% 8% 30% 30% 12% 1	836
September	1st to 10th	Night	20% 10% 28% 29% 11% 1	760
	11th to 20th	Night	18% 9% 22% 30% 19% 2	760
	21st to end	Night	23% 13% 24% 21% 18% 1	760
October	1st to 10th	Night	28% 13% 27% 19% 12% 1	760
	11th to 20th	Night	29% 18% 26% 21% 6%	760
	21st to end	Night	37% 19% 24% 18% 2	836
November	1st to 10th	Night	33% 19% 27% 16% 5% 1	780
	11th to 20th	Night	30% 23% 26% 14% 6% 2	800
	21st to end	Night	32% 25% 25% 13% 5%	800
December	1st to 10th	Night	34% 25% 27% 13% 3	800
	11th to 20th	Night	33% 27% 23% 13% 3 1	800
	21st to end	Night	34% 24% 28% 11% 3	851

Page generated at 2024-12-21 04:13:49. Version ac07

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