Medawisla Lodge
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Medawisla Lodge clear sky chart from 2005-11-06 to 2026-05-02.

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	15% 12% 4 10% 6% 5% 5% 4 6% 6% 28%	131105
	Night	13% 12% 4 11% 7% 6% 5% 4 5% 6% 27%	131439
Transparency	Day	53% 6% 11% 19% 10% 1	134583
	Night	53% 7% 11% 18% 10% 1	136049
Seeing	Day	26% 20% 30% 16% 6% 1	17519
	Night	24% 18% 29% 21% 7% 1	25959

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	9% 14% 6% 16% 7% 7% 5% 3 4 5% 22%	4621
	11th to 20th	Day	7% 14% 7% 19% 12% 8% 5% 3 4 4 18%	4650
	21st to end	Day	6% 9% 5% 12% 7% 9% 8% 6% 7% 6% 25%	5124
February	1st to 10th	Day	11% 14% 6% 12% 10% 7% 6% 3 5% 5% 22%	1837
	11th to 20th	Day	11% 13% 7% 15% 9% 7% 6% 3 4 4 23%	1961
	21st to end	Day	10% 14% 5% 12% 7% 6% 4 4 5% 5% 26%	1730
March	1st to 10th	Day	15% 17% 6% 13% 7% 5% 5% 3 4 4 23%	4576
	11th to 20th	Day	13% 16% 5% 9% 6% 5% 5% 4 5% 6% 25%	5059
	21st to end	Day	18% 14% 5% 11% 6% 5% 4 3 4 6% 23%	5648
April	1st to 10th	Day	17% 17% 4 9% 7% 5% 4 3 4 5% 26%	2520
	11th to 20th	Day	16% 15% 5% 8% 5% 4 4 3 4 4 32%	2666
	21st to end	Day	19% 14% 4 8% 5% 3 4 3 4 5% 30%	2730
May	1st to 10th	Day	21% 14% 4 9% 6% 5% 5% 4 5% 4 23%	5899
	11th to 20th	Day	20% 12% 3 8% 6% 5% 5% 4 6% 6% 25%	6037
	21st to end	Day	16% 11% 3 8% 6% 6% 5% 4 6% 7% 28%	7259
June	1st to 10th	Day	24% 9% 3 8% 5% 5% 4 4 6% 8% 25%	3000
	11th to 20th	Day	18% 8% 3 6% 5% 4 5% 5% 7% 7% 33%	3000
	21st to end	Day	22% 10% 3 7% 5% 5% 5% 4 7% 8% 25%	3000
July	1st to 10th	Day	14% 8% 3 8% 6% 6% 7% 6% 7% 9% 26%	6664
	11th to 20th	Day	13% 7% 3 8% 5% 6% 5% 4 6% 9% 35%	6360
	21st to end	Day	11% 7% 3 7% 5% 5% 5% 4 6% 8% 38%	6926
August	1st to 10th	Day	15% 8% 3 8% 5% 5% 6% 4 8% 8% 30%	4301
	11th to 20th	Day	14% 9% 3 9% 6% 6% 6% 5% 7% 9% 26%	4175
	21st to end	Day	14% 8% 2 8% 5% 5% 5% 4 6% 7% 36%	4628
September	1st to 10th	Day	12% 7% 2 6% 4 4 4 4 6% 7% 43%	2333
	11th to 20th	Day	14% 6% 2 8% 3 3 3 3 5% 7% 46%	2200
	21st to end	Day	14% 9% 3 8% 5% 4 4 3 6% 6% 38%	2200
October	1st to 10th	Day	15% 11% 3 7% 4 4 4 3 5% 7% 37%	2158
	11th to 20th	Day	16% 15% 4 8% 5% 4 4 3 5% 7% 29%	1930
	21st to end	Day	17% 17% 5% 11% 5% 4 4 4 4 5% 25%	1980
November	1st to 10th	Day	15% 16% 4 9% 6% 4 5% 3 4 5% 30%	1851
	11th to 20th	Day	15% 16% 6% 12% 6% 3 3 3 6% 5% 26%	1828
	21st to end	Day	18% 14% 4 12% 6% 5% 4 4 5% 6% 22%	1663
December	1st to 10th	Day	12% 16% 6% 18% 7% 6% 4 3 4 5% 17%	2350
	11th to 20th	Day	14% 14% 7% 10% 6% 4 4 3 5% 4 29%	2688
	21st to end	Day	14% 16% 5% 13% 5% 5% 4 4 5% 5% 25%	3553
January	1st to 10th	Night	8% 14% 6% 15% 10% 9% 6% 4 4 5% 18%	8261
	11th to 20th	Night	9% 14% 6% 17% 12% 8% 7% 4 5% 4 13%	8235
	21st to end	Night	6% 8% 4 13% 8% 9% 9% 5% 7% 6% 25%	9057
February	1st to 10th	Night	10% 13% 4 11% 8% 7% 6% 5% 6% 6% 24%	2782
	11th to 20th	Night	9% 12% 6% 13% 9% 7% 7% 4 5% 5% 23%	2544
	21st to end	Night	12% 12% 3 9% 8% 6% 6% 4 4 5% 30%	2076
March	1st to 10th	Night	18% 16% 6% 12% 5% 4 6% 3 4 5% 22%	5484
	11th to 20th	Night	11% 15% 6% 10% 6% 5% 5% 4 5% 7% 25%	5119
	21st to end	Night	18% 15% 4 9% 6% 5% 4 3 5% 7% 23%	5524
April	1st to 10th	Night	19% 16% 4 8% 4 3 4 3 5% 4 29%	2100
	11th to 20th	Night	17% 13% 3 8% 3 4 4 4 5% 6% 32%	1901
	21st to end	Night	19% 13% 4 7% 6% 5% 4 3 6% 5% 29%	1890
May	1st to 10th	Night	20% 12% 5% 10% 5% 4 5% 3 5% 7% 24%	4064
	11th to 20th	Night	20% 11% 3 8% 5% 5% 4 4 6% 6% 27%	3899
	21st to end	Night	17% 8% 3 6% 5% 4 5% 3 6% 8% 35%	3629
June	1st to 10th	Night	21% 11% 3 8% 5% 4 5% 2 5% 7% 29%	1400
	11th to 20th	Night	15% 7% 3 7% 6% 5% 5% 4 6% 9% 33%	1400
	21st to end	Night	18% 10% 4 8% 5% 4 5% 4 5% 8% 30%	1400
July	1st to 10th	Night	13% 9% 3 9% 5% 4 6% 4 5% 8% 33%	3292
	11th to 20th	Night	12% 7% 3 9% 6% 6% 5% 4 6% 7% 35%	3600
	21st to end	Night	8% 7% 2 7% 4 5% 6% 5% 7% 9% 39%	3926
August	1st to 10th	Night	17% 8% 4 8% 5% 5% 5% 4 5% 7% 32%	2817
	11th to 20th	Night	11% 8% 3 10% 6% 7% 5% 5% 7% 7% 31%	2872
	21st to end	Night	12% 8% 2 5% 4 4 4 3 5% 6% 46%	3254
September	1st to 10th	Night	10% 6% 2 6% 4 4 4 4 5% 8% 48%	2066
	11th to 20th	Night	13% 6% 2 6% 4 4 3 3 5% 7% 48%	2200
	21st to end	Night	13% 8% 3 7% 5% 4 4 3 6% 8% 39%	2200
October	1st to 10th	Night	14% 8% 3 7% 5% 4 4 4 5% 8% 39%	2241
	11th to 20th	Night	15% 14% 3 7% 5% 5% 4 3 5% 6% 33%	2466
	21st to end	Night	18% 13% 4 9% 6% 5% 4 4 4 6% 28%	2860
November	1st to 10th	Night	16% 13% 5% 9% 6% 5% 4 3 5% 6% 28%	2667
	11th to 20th	Night	14% 13% 5% 12% 7% 4 3 3 4 5% 29%	2789
	21st to end	Night	15% 13% 5% 12% 7% 5% 5% 4 5% 5% 23%	2956
December	1st to 10th	Night	13% 12% 5% 18% 10% 8% 6% 4 5% 4 14%	5060
	11th to 20th	Night	15% 15% 5% 11% 7% 5% 5% 4 6% 5% 22%	5741
	21st to end	Night	15% 14% 5% 11% 7% 6% 4 3 4 4 27%	7667

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	60% 7% 9% 15% 7% 1	4622
	11th to 20th	Day	65% 6% 6% 15% 7% 1	4680
	21st to end	Day	51% 7% 8% 16% 17% 2	5124
February	1st to 10th	Day	62% 5% 6% 15% 9% 2	1837
	11th to 20th	Day	62% 6% 7% 14% 10% 1	1969
	21st to end	Day	56% 6% 7% 18% 11% 3	1730
March	1st to 10th	Day	63% 4 6% 10% 13% 4	4579
	11th to 20th	Day	54% 8% 14% 14% 9% 1	5059
	21st to end	Day	59% 5% 5% 15% 12% 3	5648
April	1st to 10th	Day	60% 5% 8% 14% 11% 2	2520
	11th to 20th	Day	54% 5% 8% 18% 14% 1	2666
	21st to end	Day	56% 4 7% 19% 11% 3	2730
May	1st to 10th	Day	61% 6% 8% 17% 7% 1	5910
	11th to 20th	Day	57% 6% 11% 17% 6% 2	6041
	21st to end	Day	52% 7% 11% 17% 11% 2	7259
June	1st to 10th	Day	55% 6% 12% 18% 8%	3000
	11th to 20th	Day	47% 6% 12% 23% 11% 1	3000
	21st to end	Day	55% 6% 12% 18% 8% 1	3000
July	1st to 10th	Day	49% 8% 17% 18% 7%	6592
	11th to 20th	Day	43% 7% 14% 30% 6%	6285
	21st to end	Day	41% 7% 14% 30% 9%	6728
August	1st to 10th	Day	49% 7% 16% 23% 6%	4287
	11th to 20th	Day	50% 7% 16% 21% 5%	4214
	21st to end	Day	44% 6% 13% 23% 14%	4628
September	1st to 10th	Day	38% 7% 15% 26% 14% 1	2333
	11th to 20th	Day	37% 4 11% 30% 16% 1	2200
	21st to end	Day	44% 5% 11% 25% 13% 1	2200
October	1st to 10th	Day	52% 5% 12% 22% 9%	3509
	11th to 20th	Day	53% 4 10% 23% 10%	3120
	21st to end	Day	45% 4 16% 21% 14%	3180
November	1st to 10th	Day	55% 6% 11% 18% 9% 1	1851
	11th to 20th	Day	55% 8% 9% 17% 9% 2	1828
	21st to end	Day	60% 7% 11% 17% 5%	1663
December	1st to 10th	Day	67% 5% 8% 11% 8%	2350
	11th to 20th	Day	54% 6% 10% 13% 14% 4	2688
	21st to end	Day	57% 8% 7% 13% 10% 5%	3553
January	1st to 10th	Night	62% 7% 10% 13% 8%	8261
	11th to 20th	Night	66% 9% 8% 10% 6% 1	8280
	21st to end	Night	52% 7% 7% 17% 15% 2	9057
February	1st to 10th	Night	56% 6% 8% 17% 11% 2	2782
	11th to 20th	Night	57% 8% 8% 15% 10% 1	2547
	21st to end	Night	52% 6% 7% 19% 12% 2	2076
March	1st to 10th	Night	63% 5% 6% 13% 10% 3	5494
	11th to 20th	Night	54% 8% 16% 13% 9% 1	5120
	21st to end	Night	57% 4 5% 18% 13% 1	5524
April	1st to 10th	Night	56% 5% 7% 15% 14% 3	2100
	11th to 20th	Night	50% 6% 8% 21% 14% 2	1901
	21st to end	Night	54% 5% 8% 19% 11% 3	1890
May	1st to 10th	Night	58% 5% 13% 16% 8%	4070
	11th to 20th	Night	55% 6% 12% 20% 5% 1	3900
	21st to end	Night	44% 8% 14% 21% 13%	3630
June	1st to 10th	Night	54% 4 11% 21% 9%	1400
	11th to 20th	Night	45% 8% 13% 22% 11% 1	1400
	21st to end	Night	52% 6% 14% 19% 9%	1400
July	1st to 10th	Night	47% 6% 16% 23% 7%	3254
	11th to 20th	Night	42% 8% 14% 30% 6%	3552
	21st to end	Night	35% 9% 18% 29% 8%	3809
August	1st to 10th	Night	51% 7% 15% 23% 4	2807
	11th to 20th	Night	45% 9% 18% 20% 8% 1	2899
	21st to end	Night	38% 7% 15% 24% 15% 3	3254
September	1st to 10th	Night	32% 6% 15% 33% 13% 1	2066
	11th to 20th	Night	35% 5% 13% 30% 16%	2200
	21st to end	Night	41% 6% 13% 25% 14% 1	2200
October	1st to 10th	Night	45% 6% 13% 24% 13%	3670
	11th to 20th	Night	46% 5% 11% 27% 11%	4015
	21st to end	Night	44% 5% 17% 21% 11% 1	4610
November	1st to 10th	Night	53% 6% 11% 20% 9% 1	2667
	11th to 20th	Night	54% 7% 10% 16% 11% 2	2789
	21st to end	Night	57% 8% 13% 14% 7%	2956
December	1st to 10th	Night	67% 6% 9% 14% 4	5060
	11th to 20th	Night	57% 6% 8% 14% 14% 1	5742
	21st to end	Night	57% 6% 8% 15% 11% 2	7667

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	33% 25% 30% 11% 1	220
	11th to 20th	Day	29% 34% 26% 8% 2	220
	21st to end	Day	31% 22% 34% 11% 2 1	242
February	1st to 10th	Day	27% 27% 31% 13% 2 1	377
	11th to 20th	Day	31% 31% 27% 10% 2	489
	21st to end	Day	29% 28% 29% 12% 2	446
March	1st to 10th	Day	31% 27% 30% 10% 2	540
	11th to 20th	Day	32% 26% 28% 10% 4 1	540
	21st to end	Day	34% 24% 24% 12% 5% 1	594
April	1st to 10th	Day	37% 22% 26% 10% 4	540
	11th to 20th	Day	34% 23% 27% 11% 3 2	532
	21st to end	Day	32% 20% 32% 10% 4 2	540
May	1st to 10th	Day	34% 16% 32% 14% 3 1	507
	11th to 20th	Day	30% 15% 32% 17% 5% 1	527
	21st to end	Day	23% 23% 32% 18% 4 1	701
June	1st to 10th	Day	29% 15% 32% 16% 6% 1	730
	11th to 20th	Day	21% 16% 32% 20% 11% 1	730
	21st to end	Day	25% 15% 33% 19% 8% 1	730
July	1st to 10th	Day	19% 14% 37% 20% 9% 1	658
	11th to 20th	Day	17% 11% 42% 20% 8% 1	524
	21st to end	Day	16% 13% 38% 27% 6% 1	576
August	1st to 10th	Day	18% 13% 31% 27% 9% 2	526
	11th to 20th	Day	16% 13% 31% 25% 13% 3	519
	21st to end	Day	19% 15% 30% 22% 11% 3	583
September	1st to 10th	Day	16% 15% 33% 21% 12% 3	530
	11th to 20th	Day	20% 15% 26% 19% 14% 6%	530
	21st to end	Day	19% 15% 31% 20% 9% 5%	530
October	1st to 10th	Day	22% 18% 28% 19% 10% 3	506
	11th to 20th	Day	28% 20% 29% 14% 8% 2	420
	21st to end	Day	28% 24% 28% 15% 5%	462
November	1st to 10th	Day	32% 20% 28% 16% 4	425
	11th to 20th	Day	31% 24% 26% 13% 5%	430
	21st to end	Day	37% 22% 25% 13% 3	413
December	1st to 10th	Day	26% 28% 29% 16%	220
	11th to 20th	Day	34% 30% 25% 6% 5%	220
	21st to end	Day	37% 23% 26% 11% 3	242
January	1st to 10th	Night	25% 24% 32% 16% 2	846
	11th to 20th	Night	27% 23% 30% 16% 3	840
	21st to end	Night	20% 26% 35% 15% 4	924
February	1st to 10th	Night	23% 28% 31% 15% 4	840
	11th to 20th	Night	24% 29% 32% 14% 2	823
	21st to end	Night	23% 23% 35% 16% 3	692
March	1st to 10th	Night	27% 22% 34% 16% 1	840
	11th to 20th	Night	26% 23% 29% 17% 5%	840
	21st to end	Night	25% 21% 29% 20% 5%	924
April	1st to 10th	Night	32% 20% 28% 15% 5%	840
	11th to 20th	Night	27% 18% 29% 20% 6%	657
	21st to end	Night	32% 14% 29% 18% 7%	630
May	1st to 10th	Night	26% 14% 29% 24% 5% 1	604
	11th to 20th	Night	24% 15% 30% 24% 7%	536
	21st to end	Night	24% 10% 35% 23% 7% 1	433
June	1st to 10th	Night	24% 12% 28% 27% 8% 1	400
	11th to 20th	Night	18% 12% 29% 29% 12% 1	400
	21st to end	Night	20% 8% 36% 30% 8%	400
July	1st to 10th	Night	16% 8% 32% 34% 8% 1	390
	11th to 20th	Night	15% 5% 28% 38% 13% 1	388
	21st to end	Night	15% 8% 29% 37% 11% 1	438
August	1st to 10th	Night	18% 6% 27% 35% 14%	538
	11th to 20th	Night	15% 7% 26% 35% 15% 1	592
	21st to end	Night	14% 10% 28% 32% 15% 1	678
September	1st to 10th	Night	13% 11% 30% 32% 14% 1	800
	11th to 20th	Night	17% 10% 24% 31% 16% 2	800
	21st to end	Night	17% 13% 31% 25% 13% 2	800
October	1st to 10th	Night	21% 14% 24% 28% 12% 1	800
	11th to 20th	Night	25% 17% 27% 21% 9% 1	800
	21st to end	Night	28% 21% 28% 18% 5%	880
November	1st to 10th	Night	28% 21% 26% 19% 5%	820
	11th to 20th	Night	26% 22% 27% 17% 7% 1	871
	21st to end	Night	27% 23% 29% 17% 4 1	950
December	1st to 10th	Night	28% 21% 32% 15% 3	950
	11th to 20th	Night	31% 23% 27% 15% 3 1	950
	21st to end	Night	30% 23% 29% 14% 3	1045

Page generated at 2026-04-29 02:21:41. Version ac07

Copyright © 2026 Attilla Danko.