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 2025-01-07.

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 5% 6% 29%	104558
	Night	14% 12% 4 10% 6% 5% 5% 4 5% 6% 28%	104523
Transparency	Day	52% 6% 11% 19% 10% 1	108054
	Night	52% 7% 11% 19% 10% 1	109117
Seeing	Day	26% 19% 31% 17% 7% 1	15815
	Night	24% 18% 29% 21% 7% 1	24233

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	11% 14% 6% 14% 6% 7% 5% 4 5% 6% 22%	2537
	11th to 20th	Day	9% 14% 5% 16% 10% 6% 4 3 3 4 24%	2520
	21st to end	Day	10% 12% 6% 16% 8% 7% 5% 4 5% 5% 24%	2772
February	1st to 10th	Day	12% 15% 6% 11% 9% 7% 6% 3 5% 5% 21%	1661
	11th to 20th	Day	11% 13% 7% 15% 9% 7% 6% 3 4 4 22%	1769
	21st to end	Day	11% 14% 5% 12% 7% 6% 4 4 5% 6% 26%	1570
March	1st to 10th	Day	16% 18% 6% 10% 5% 4 4 3 4 4 26%	3116
	11th to 20th	Day	14% 21% 6% 11% 7% 5% 4 3 3 4 21%	3464
	21st to end	Day	18% 14% 5% 10% 6% 4 3 3 4 6% 27%	3862
April	1st to 10th	Day	17% 16% 4 9% 7% 5% 4 3 5% 5% 25%	2280
	11th to 20th	Day	16% 15% 5% 8% 5% 4 4 3 4 5% 33%	2409
	21st to end	Day	20% 14% 4 8% 5% 3 4 3 4 5% 30%	2470
May	1st to 10th	Day	18% 11% 4 8% 6% 6% 4 4 5% 5% 29%	4106
	11th to 20th	Day	19% 11% 3 8% 6% 5% 6% 5% 6% 7% 25%	4201
	21st to end	Day	13% 9% 3 8% 6% 6% 6% 5% 7% 8% 29%	5049
June	1st to 10th	Day	25% 9% 3 8% 5% 5% 4 4 6% 8% 25%	2850
	11th to 20th	Day	19% 8% 3 6% 5% 4 5% 5% 6% 7% 33%	2850
	21st to end	Day	22% 10% 3 7% 5% 5% 5% 4 7% 7% 24%	2850
July	1st to 10th	Day	13% 8% 2 7% 6% 5% 6% 5% 7% 9% 31%	4646
	11th to 20th	Day	13% 7% 3 8% 6% 5% 5% 4 6% 9% 34%	4440
	21st to end	Day	12% 8% 3 8% 5% 5% 5% 4 6% 8% 36%	4814
August	1st to 10th	Day	16% 8% 3 8% 5% 5% 6% 4 8% 8% 28%	4169
	11th to 20th	Day	14% 9% 3 9% 6% 6% 6% 5% 7% 9% 24%	4045
	21st to end	Day	14% 8% 2 8% 5% 5% 5% 4 6% 7% 36%	4486
September	1st to 10th	Day	12% 7% 2 6% 4 4 4 4 6% 8% 42%	2217
	11th to 20th	Day	15% 6% 2 8% 3 3 3 3 5% 7% 46%	2090
	21st to end	Day	14% 9% 3 8% 4 4 4 3 6% 6% 37%	2090
October	1st to 10th	Day	16% 11% 4 7% 4 4 4 3 5% 6% 36%	2050
	11th to 20th	Day	17% 15% 3 8% 5% 4 4 3 5% 7% 28%	1834
	21st to end	Day	17% 17% 5% 11% 5% 4 3 3 4 5% 25%	1881
November	1st to 10th	Day	15% 14% 4 9% 6% 4 5% 3 5% 5% 30%	1761
	11th to 20th	Day	15% 16% 5% 11% 6% 3 3 3 6% 5% 26%	1741
	21st to end	Day	19% 14% 4 11% 6% 5% 4 4 5% 6% 22%	1584
December	1st to 10th	Day	13% 16% 6% 18% 7% 6% 4 3 5% 5% 16%	2280
	11th to 20th	Day	14% 14% 7% 9% 6% 4 4 3 5% 4 29%	2618
	21st to end	Day	14% 16% 5% 12% 5% 5% 5% 4 5% 5% 24%	3476
January	1st to 10th	Night	11% 14% 5% 14% 11% 8% 6% 4 4 5% 19%	4541
	11th to 20th	Night	11% 12% 5% 13% 11% 9% 8% 5% 5% 4 17%	4440
	21st to end	Night	11% 11% 5% 16% 8% 7% 6% 4 6% 6% 21%	4884
February	1st to 10th	Night	11% 13% 4 10% 8% 7% 6% 6% 6% 6% 23%	2518
	11th to 20th	Night	9% 12% 6% 14% 9% 7% 6% 4 5% 5% 21%	2296
	21st to end	Night	12% 12% 4 10% 8% 6% 6% 4 4 5% 30%	1884
March	1st to 10th	Night	20% 17% 6% 8% 4 4 6% 3 4 5% 25%	3724
	11th to 20th	Night	11% 19% 7% 12% 7% 6% 5% 4 4 5% 21%	3494
	21st to end	Night	19% 16% 4 10% 6% 4 4 3 4 7% 22%	3768
April	1st to 10th	Night	18% 16% 4 8% 4 3 4 3 5% 4 29%	1900
	11th to 20th	Night	16% 12% 3 7% 3 4 4 4 5% 7% 33%	1718
	21st to end	Night	19% 13% 4 7% 6% 5% 4 3 6% 5% 29%	1710
May	1st to 10th	Night	20% 11% 3 7% 4 4 5% 3 6% 8% 30%	2834
	11th to 20th	Night	17% 11% 3 9% 6% 5% 5% 5% 6% 7% 26%	2721
	21st to end	Night	16% 7% 2 5% 4 4 5% 4 7% 9% 37%	2532
June	1st to 10th	Night	22% 11% 3 7% 5% 4 5% 2 5% 7% 29%	1330
	11th to 20th	Night	15% 8% 3 7% 6% 5% 5% 4 5% 9% 34%	1330
	21st to end	Night	18% 10% 4 8% 5% 4 5% 4 5% 7% 30%	1330
July	1st to 10th	Night	11% 8% 3 9% 5% 5% 6% 5% 6% 8% 35%	2303
	11th to 20th	Night	14% 7% 3 8% 5% 5% 5% 4 7% 7% 34%	2520
	21st to end	Night	10% 8% 2 7% 4 5% 6% 5% 6% 8% 39%	2739
August	1st to 10th	Night	18% 8% 4 8% 5% 5% 5% 4 5% 7% 30%	2730
	11th to 20th	Night	11% 8% 3 10% 6% 7% 6% 5% 7% 7% 30%	2782
	21st to end	Night	12% 8% 2 5% 5% 4 4 3 5% 6% 46%	3154
September	1st to 10th	Night	10% 7% 2 6% 4 3 4 4 5% 8% 47%	1962
	11th to 20th	Night	13% 7% 2 6% 4 3 3 3 5% 7% 47%	2090
	21st to end	Night	13% 9% 3 7% 5% 4 4 3 6% 7% 39%	2090
October	1st to 10th	Night	15% 8% 3 7% 5% 4 4 4 5% 8% 37%	2129
	11th to 20th	Night	16% 13% 3 8% 5% 5% 4 3 5% 6% 33%	2342
	21st to end	Night	18% 13% 4 9% 6% 5% 4 4 4 5% 28%	2717
November	1st to 10th	Night	15% 12% 5% 9% 6% 5% 4 4 5% 6% 30%	2537
	11th to 20th	Night	14% 13% 4 11% 7% 4 3 3 4 5% 30%	2656
	21st to end	Night	15% 13% 5% 11% 7% 6% 5% 4 5% 5% 24%	2815
December	1st to 10th	Night	13% 12% 5% 18% 10% 8% 6% 4 5% 4 14%	4910
	11th to 20th	Night	15% 15% 5% 11% 7% 5% 5% 4 6% 5% 23%	5591
	21st to end	Night	16% 14% 5% 11% 7% 5% 4 3 4 4 27%	7502

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	56% 10% 10% 17% 6%	2538
	11th to 20th	Day	59% 9% 4 19% 8% 1	2520
	21st to end	Day	58% 8% 7% 13% 12% 1	2772
February	1st to 10th	Day	62% 6% 7% 14% 9% 2	1661
	11th to 20th	Day	63% 6% 7% 13% 10% 1	1777
	21st to end	Day	56% 6% 7% 17% 10% 3	1570
March	1st to 10th	Day	61% 4 6% 12% 13% 3	3119
	11th to 20th	Day	62% 9% 8% 11% 9% 2	3464
	21st to end	Day	57% 5% 5% 15% 14% 3	3862
April	1st to 10th	Day	60% 5% 9% 13% 11% 3	2280
	11th to 20th	Day	53% 5% 8% 19% 14% 1	2409
	21st to end	Day	57% 4 7% 18% 11% 3	2470
May	1st to 10th	Day	54% 7% 10% 19% 9% 1	4120
	11th to 20th	Day	54% 6% 14% 18% 7% 1	4205
	21st to end	Day	48% 8% 13% 18% 12% 1	5049
June	1st to 10th	Day	56% 6% 12% 18% 7%	2850
	11th to 20th	Day	48% 6% 12% 22% 11% 1	2850
	21st to end	Day	56% 6% 12% 17% 8%	2850
July	1st to 10th	Day	45% 7% 16% 22% 9%	4574
	11th to 20th	Day	44% 7% 14% 29% 5%	4365
	21st to end	Day	44% 8% 12% 28% 7%	4661
August	1st to 10th	Day	50% 7% 16% 22% 5%	4155
	11th to 20th	Day	51% 8% 16% 20% 5%	4084
	21st to end	Day	44% 6% 13% 23% 14%	4486
September	1st to 10th	Day	38% 7% 16% 25% 13% 1	2217
	11th to 20th	Day	38% 4 11% 30% 15% 1	2090
	21st to end	Day	45% 5% 11% 25% 13% 1	2090
October	1st to 10th	Day	53% 5% 12% 21% 9%	3401
	11th to 20th	Day	53% 4 10% 23% 10%	3024
	21st to end	Day	45% 4 16% 21% 14%	3081
November	1st to 10th	Day	54% 6% 12% 18% 10% 1	1761
	11th to 20th	Day	55% 8% 9% 17% 9% 2	1741
	21st to end	Day	59% 7% 12% 17% 5%	1584
December	1st to 10th	Day	67% 5% 8% 11% 8%	2280
	11th to 20th	Day	54% 6% 10% 13% 14% 4	2618
	21st to end	Day	57% 8% 8% 13% 10% 5%	3476
January	1st to 10th	Night	60% 10% 10% 14% 5%	4541
	11th to 20th	Night	59% 13% 8% 14% 6% 1	4440
	21st to end	Night	58% 8% 8% 14% 10% 2	4884
February	1st to 10th	Night	57% 6% 9% 16% 10% 2	2518
	11th to 20th	Night	58% 9% 8% 14% 10% 1	2299
	21st to end	Night	53% 7% 8% 18% 12% 3	1884
March	1st to 10th	Night	61% 5% 7% 16% 8% 2	3734
	11th to 20th	Night	60% 9% 10% 11% 9% 1	3495
	21st to end	Night	59% 5% 5% 18% 11% 2	3768
April	1st to 10th	Night	56% 5% 7% 15% 15% 3	1900
	11th to 20th	Night	48% 6% 9% 22% 14% 2	1718
	21st to end	Night	54% 5% 8% 18% 11% 3	1710
May	1st to 10th	Night	51% 5% 14% 20% 9% 1	2840
	11th to 20th	Night	55% 6% 14% 18% 6% 1	2722
	21st to end	Night	40% 9% 17% 21% 12%	2533
June	1st to 10th	Night	54% 5% 12% 21% 8%	1330
	11th to 20th	Night	46% 7% 13% 21% 11% 2	1330
	21st to end	Night	52% 6% 14% 18% 9%	1330
July	1st to 10th	Night	43% 7% 17% 23% 10%	2265
	11th to 20th	Night	43% 7% 15% 29% 6%	2472
	21st to end	Night	36% 10% 18% 27% 9%	2651
August	1st to 10th	Night	52% 7% 15% 22% 4	2720
	11th to 20th	Night	46% 9% 18% 19% 8%	2809
	21st to end	Night	38% 7% 15% 23% 15% 3	3154
September	1st to 10th	Night	33% 6% 16% 31% 13% 1	1962
	11th to 20th	Night	36% 5% 14% 29% 15%	2090
	21st to end	Night	41% 6% 13% 25% 13% 1	2090
October	1st to 10th	Night	46% 6% 12% 23% 12%	3558
	11th to 20th	Night	46% 6% 11% 26% 11%	3891
	21st to end	Night	44% 5% 17% 21% 11% 1	4467
November	1st to 10th	Night	52% 6% 11% 21% 9% 1	2537
	11th to 20th	Night	53% 7% 10% 17% 11% 2	2656
	21st to end	Night	57% 8% 13% 15% 7%	2815
December	1st to 10th	Night	67% 6% 9% 14% 4	4910
	11th to 20th	Night	56% 6% 8% 14% 15% 1	5592
	21st to end	Night	57% 6% 8% 15% 11% 2	7502

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	34% 23% 30% 11% 1	192
	11th to 20th	Day	29% 34% 26% 9% 2 1	180
	21st to end	Day	28% 19% 37% 13% 2 1	198
February	1st to 10th	Day	28% 26% 31% 12% 1 1	321
	11th to 20th	Day	30% 32% 27% 9% 2	417
	21st to end	Day	29% 27% 29% 14% 2	382
March	1st to 10th	Day	32% 23% 32% 11% 3	460
	11th to 20th	Day	28% 26% 29% 11% 4 1	460
	21st to end	Day	33% 23% 25% 13% 6% 1	506
April	1st to 10th	Day	36% 23% 24% 12% 5%	460
	11th to 20th	Day	33% 21% 28% 12% 4 2	452
	21st to end	Day	33% 18% 33% 10% 4 2	460
May	1st to 10th	Day	33% 15% 32% 15% 3 1	463
	11th to 20th	Day	29% 15% 33% 16% 5% 1	487
	21st to end	Day	21% 23% 33% 18% 4 1	650
June	1st to 10th	Day	29% 16% 31% 15% 7% 1	680
	11th to 20th	Day	21% 15% 31% 20% 11% 1	680
	21st to end	Day	25% 14% 33% 19% 8% 1	680
July	1st to 10th	Day	19% 13% 36% 21% 10% 1	611
	11th to 20th	Day	17% 11% 43% 20% 8% 1	484
	21st to end	Day	16% 12% 37% 28% 6% 1	532
August	1st to 10th	Day	20% 14% 31% 26% 8% 2	486
	11th to 20th	Day	17% 13% 32% 25% 11% 3	479
	21st to end	Day	19% 15% 28% 22% 12% 3	539
September	1st to 10th	Day	16% 15% 34% 21% 11% 3	490
	11th to 20th	Day	20% 15% 27% 19% 13% 6%	490
	21st to end	Day	19% 14% 31% 20% 10% 6%	490
October	1st to 10th	Day	22% 18% 28% 19% 11% 3	468
	11th to 20th	Day	28% 19% 29% 13% 8% 2	390
	21st to end	Day	28% 24% 27% 15% 5%	429
November	1st to 10th	Day	32% 18% 29% 17% 4 1	395
	11th to 20th	Day	32% 24% 26% 13% 6% 1	400
	21st to end	Day	37% 21% 26% 12% 4 1	384
December	1st to 10th	Day	27% 27% 28% 18% 1	200
	11th to 20th	Day	35% 30% 24% 7% 5%	200
	21st to end	Day	36% 24% 26% 10% 4	220
January	1st to 10th	Night	25% 24% 32% 16% 3	791
	11th to 20th	Night	28% 24% 29% 16% 3	760
	21st to end	Night	20% 26% 34% 16% 4	836
February	1st to 10th	Night	23% 28% 32% 15% 3	760
	11th to 20th	Night	22% 30% 32% 14% 2	743
	21st to end	Night	23% 23% 35% 16% 3	628
March	1st to 10th	Night	26% 21% 34% 17% 1	760
	11th to 20th	Night	25% 22% 30% 17% 5%	760
	21st to end	Night	25% 21% 28% 20% 6%	836
April	1st to 10th	Night	31% 19% 30% 16% 5%	760
	11th to 20th	Night	24% 19% 31% 20% 7%	594
	21st to end	Night	33% 14% 28% 18% 6%	570
May	1st to 10th	Night	26% 14% 29% 25% 6% 1	570
	11th to 20th	Night	23% 14% 31% 25% 7%	509
	21st to end	Night	23% 10% 36% 22% 8% 1	411
June	1st to 10th	Night	25% 12% 28% 26% 8% 1	380
	11th to 20th	Night	18% 11% 28% 29% 13% 1	380
	21st to end	Night	20% 7% 34% 31% 8%	380
July	1st to 10th	Night	16% 8% 32% 35% 9% 1	370
	11th to 20th	Night	14% 5% 28% 37% 14% 1	368
	21st to end	Night	15% 7% 27% 37% 12% 1	416
August	1st to 10th	Night	18% 6% 27% 34% 14%	511
	11th to 20th	Night	15% 7% 27% 35% 14% 1	562
	21st to end	Night	14% 9% 27% 32% 16% 1	644
September	1st to 10th	Night	13% 10% 30% 32% 14% 1	760
	11th to 20th	Night	18% 11% 25% 30% 16% 2	760
	21st to end	Night	18% 12% 30% 24% 13% 2	760
October	1st to 10th	Night	21% 14% 24% 28% 12% 1	760
	11th to 20th	Night	26% 18% 26% 20% 9% 1	760
	21st to end	Night	28% 22% 28% 17% 6%	836
November	1st to 10th	Night	27% 20% 27% 20% 6%	780
	11th to 20th	Night	26% 22% 27% 17% 8% 1	828
	21st to end	Night	28% 23% 29% 17% 4 1	900
December	1st to 10th	Night	28% 22% 32% 15% 3	900
	11th to 20th	Night	31% 22% 27% 15% 4 1	900
	21st to end	Night	30% 23% 30% 14% 3	990

Page generated at 2025-01-04 03:24:00. Version ac07

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