Medomak Family Camp
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Medomak Family Camp clear sky chart from 2005-11-06 to 2026-03-03.

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% 8% 3 6% 4 4 4 3 5% 7% 37%	130021
	Night	18% 9% 3 7% 4 4 4 3 5% 6% 37%	131138
Transparency	Day	46% 6% 12% 21% 13% 2	133529
	Night	46% 5% 11% 21% 14% 2	135705
Seeing	Day	23% 18% 32% 19% 7% 1	17117
	Night	23% 14% 32% 24% 7% 1	25794

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% 7% 3 9% 6% 5% 5% 4 6% 6% 37%	4661
	11th to 20th	Day	15% 11% 3 6% 3 3 4 3 4 6% 41%	4650
	21st to end	Day	10% 10% 3 6% 4 4 4 3 4 6% 47%	5142
February	1st to 10th	Day	16% 9% 3 7% 6% 4 4 3 5% 5% 37%	1890
	11th to 20th	Day	13% 9% 3 7% 5% 5% 5% 4 5% 7% 38%	1996
	21st to end	Day	15% 10% 4 7% 4 4 5% 4 5% 5% 37%	1730
March	1st to 10th	Day	23% 12% 3 8% 5% 4 4 3 4 4 31%	4496
	11th to 20th	Day	19% 11% 3 7% 5% 4 4 3 4 5% 35%	4968
	21st to end	Day	27% 8% 2 6% 3 4 4 3 5% 6% 30%	5502
April	1st to 10th	Day	20% 11% 3 8% 5% 4 3 3 5% 5% 34%	2400
	11th to 20th	Day	20% 7% 2 6% 4 4 4 3 5% 6% 38%	2517
	21st to end	Day	22% 9% 3 6% 4 4 5% 3 5% 6% 35%	2600
May	1st to 10th	Day	31% 11% 3 8% 4 4 4 3 4 5% 23%	5886
	11th to 20th	Day	18% 10% 3 8% 5% 5% 4 3 5% 7% 32%	5861
	21st to end	Day	20% 8% 2 6% 4 4 4 4 6% 9% 34%	6946
June	1st to 10th	Day	23% 7% 2 7% 4 4 4 4 5% 7% 32%	2971
	11th to 20th	Day	18% 7% 2 6% 4 4 4 4 5% 8% 38%	3000
	21st to end	Day	23% 8% 2 6% 5% 5% 5% 4 6% 6% 31%	2956
July	1st to 10th	Day	17% 8% 3 7% 5% 5% 5% 4 7% 9% 31%	6360
	11th to 20th	Day	16% 7% 2 5% 4 4 4 4 6% 10% 36%	6360
	21st to end	Day	17% 5% 2 5% 4 4 4 4 6% 8% 42%	6882
August	1st to 10th	Day	17% 7% 3 7% 4 4 5% 4 6% 7% 35%	4235
	11th to 20th	Day	16% 8% 4 8% 4 5% 5% 4 5% 6% 35%	4175
	21st to end	Day	10% 6% 2 5% 4 4 4 4 7% 8% 46%	4581
September	1st to 10th	Day	12% 6% 1 5% 3 4 4 4 5% 7% 49%	2323
	11th to 20th	Day	12% 5% 2 5% 3 4 4 2 4 6% 54%	2200
	21st to end	Day	18% 5% 2 5% 3 4 3 3 5% 8% 45%	2200
October	1st to 10th	Day	17% 6% 2 6% 5% 4 4 3 4 6% 42%	2174
	11th to 20th	Day	19% 6% 2 7% 4 4 3 3 4 6% 42%	1955
	21st to end	Day	21% 8% 3 6% 4 3 4 3 4 5% 38%	1980
November	1st to 10th	Day	17% 6% 2 6% 4 5% 3 3 5% 6% 43%	1851
	11th to 20th	Day	19% 5% 2 5% 4 3 4 3 5% 6% 43%	1890
	21st to end	Day	19% 10% 2 6% 3 3 3 3 4 5% 42%	1732
December	1st to 10th	Day	16% 12% 2 4 4 3 4 3 4 7% 42%	2457
	11th to 20th	Day	19% 8% 2 5% 3 3 3 2 4 5% 46%	2688
	21st to end	Day	21% 11% 3 6% 4 4 4 3 5% 4 35%	3806
January	1st to 10th	Night	12% 10% 3 8% 5% 5% 4 3 5% 6% 40%	8234
	11th to 20th	Night	15% 12% 4 9% 5% 4 5% 4 5% 6% 31%	8235
	21st to end	Night	11% 11% 3 7% 4 4 5% 3 4 6% 42%	9025
February	1st to 10th	Night	15% 9% 3 7% 6% 5% 5% 4 5% 6% 35%	2730
	11th to 20th	Night	13% 9% 3 8% 5% 5% 4 3 5% 6% 39%	2505
	21st to end	Night	13% 11% 4 7% 5% 5% 3 3 4 6% 40%	2076
March	1st to 10th	Night	26% 11% 3 7% 4 4 4 3 4 5% 30%	5389
	11th to 20th	Night	16% 11% 4 7% 5% 4 5% 4 5% 7% 32%	4990
	21st to end	Night	25% 9% 2 6% 4 4 4 4 6% 6% 30%	5426
April	1st to 10th	Night	22% 11% 3 6% 4 4 4 3 5% 5% 33%	2000
	11th to 20th	Night	19% 8% 3 6% 4 4 4 5% 5% 8% 35%	1832
	21st to end	Night	22% 10% 3 6% 5% 4 4 3 5% 5% 35%	1800
May	1st to 10th	Night	30% 10% 4 7% 4 3 4 3 5% 7% 24%	4054
	11th to 20th	Night	20% 10% 3 8% 5% 5% 5% 4 6% 6% 29%	4033
	21st to end	Night	17% 8% 3 7% 6% 4 5% 3 6% 8% 32%	3971
June	1st to 10th	Night	22% 8% 3 7% 4 4 5% 4 6% 8% 30%	1423
	11th to 20th	Night	16% 8% 2 6% 5% 5% 4 3 5% 8% 39%	1400
	21st to end	Night	23% 8% 3 6% 4 4 5% 3 6% 7% 30%	1437
July	1st to 10th	Night	15% 8% 3 6% 5% 5% 6% 4 7% 9% 33%	3600
	11th to 20th	Night	15% 10% 3 8% 5% 5% 5% 4 5% 8% 34%	3600
	21st to end	Night	11% 6% 2 5% 4 5% 5% 4 7% 10% 43%	3926
August	1st to 10th	Night	22% 7% 2 8% 5% 5% 5% 4 5% 7% 31%	2911
	11th to 20th	Night	16% 9% 3 7% 5% 4 5% 4 5% 8% 33%	2872
	21st to end	Night	10% 5% 3 6% 4 4 4 3 6% 8% 47%	3313
September	1st to 10th	Night	12% 4 2 5% 4 4 4 4 4 6% 51%	2076
	11th to 20th	Night	14% 7% 2 4 2 3 3 2 4 7% 53%	2200
	21st to end	Night	16% 6% 2 6% 4 3 4 3 4 7% 46%	2200
October	1st to 10th	Night	18% 5% 2 6% 4 4 4 3 5% 7% 42%	2225
	11th to 20th	Night	18% 5% 2 5% 3 4 4 3 6% 7% 42%	2440
	21st to end	Night	23% 8% 2 5% 4 3 4 3 5% 5% 37%	2860
November	1st to 10th	Night	17% 6% 2 6% 4 3 4 4 5% 6% 43%	2667
	11th to 20th	Night	17% 7% 2 5% 4 4 4 3 5% 6% 43%	2730
	21st to end	Night	17% 7% 2 6% 4 4 4 4 5% 6% 41%	2884
December	1st to 10th	Night	16% 10% 3 6% 4 4 4 3 5% 7% 38%	4948
	11th to 20th	Night	22% 8% 2 5% 3 3 3 3 4 5% 41%	5741
	21st to end	Night	21% 11% 3 6% 4 3 3 3 4 5% 37%	7385

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	47% 4 11% 25% 13% 1	4662
	11th to 20th	Day	44% 4 10% 26% 14% 2	4680
	21st to end	Day	40% 4 9% 22% 19% 5%	5142
February	1st to 10th	Day	48% 5% 10% 20% 15% 3	1890
	11th to 20th	Day	45% 6% 12% 20% 14% 3	2005
	21st to end	Day	47% 6% 10% 20% 13% 4	1730
March	1st to 10th	Day	57% 4 8% 10% 14% 7%	4499
	11th to 20th	Day	49% 6% 13% 19% 11% 2	4968
	21st to end	Day	54% 4 6% 17% 16% 4	5502
April	1st to 10th	Day	52% 5% 8% 17% 15% 4	2400
	11th to 20th	Day	46% 6% 8% 22% 15% 3	2517
	21st to end	Day	51% 5% 8% 19% 14% 4	2600
May	1st to 10th	Day	61% 9% 9% 14% 6% 1	5897
	11th to 20th	Day	51% 8% 13% 19% 7% 3	5865
	21st to end	Day	46% 8% 14% 19% 11% 1	6946
June	1st to 10th	Day	50% 7% 12% 20% 10% 1	2971
	11th to 20th	Day	45% 6% 12% 20% 15% 2	3000
	21st to end	Day	51% 10% 11% 18% 10% 1	2956
July	1st to 10th	Day	49% 6% 14% 22% 9%	6290
	11th to 20th	Day	43% 7% 15% 22% 13% 1	6285
	21st to end	Day	39% 6% 13% 26% 15% 1	6684
August	1st to 10th	Day	46% 8% 15% 24% 7%	4222
	11th to 20th	Day	47% 8% 16% 21% 8%	4214
	21st to end	Day	32% 8% 14% 26% 19% 1	4581
September	1st to 10th	Day	33% 7% 13% 28% 18% 1	2323
	11th to 20th	Day	32% 4 12% 29% 20% 3	2200
	21st to end	Day	39% 5% 10% 26% 17% 1	2200
October	1st to 10th	Day	49% 6% 9% 23% 12% 1	3538
	11th to 20th	Day	35% 3 10% 30% 22%	3158
	21st to end	Day	36% 3 13% 25% 19% 3	3180
November	1st to 10th	Day	42% 5% 13% 23% 16% 2	1851
	11th to 20th	Day	41% 5% 11% 21% 18% 3	1890
	21st to end	Day	45% 4 15% 24% 11% 1	1732
December	1st to 10th	Day	42% 4 14% 26% 12% 1	2457
	11th to 20th	Day	41% 4 12% 18% 17% 8%	2688
	21st to end	Day	52% 4 9% 18% 13% 4	3806
January	1st to 10th	Night	45% 4 11% 26% 13% 1	8234
	11th to 20th	Night	53% 5% 10% 18% 12% 2	8280
	21st to end	Night	44% 3 7% 23% 18% 5%	9025
February	1st to 10th	Night	48% 5% 11% 19% 14% 3	2730
	11th to 20th	Night	46% 5% 10% 21% 16% 3	2507
	21st to end	Night	46% 5% 9% 21% 15% 4	2076
March	1st to 10th	Night	57% 3 7% 12% 14% 7%	5399
	11th to 20th	Night	49% 6% 16% 19% 8% 2	4991
	21st to end	Night	53% 4 7% 15% 18% 3	5426
April	1st to 10th	Night	52% 4 9% 17% 15% 4	2000
	11th to 20th	Night	48% 5% 9% 22% 15% 2	1832
	21st to end	Night	51% 5% 11% 16% 14% 3	1800
May	1st to 10th	Night	60% 6% 12% 14% 7% 1	4060
	11th to 20th	Night	53% 7% 12% 19% 8% 1	4034
	21st to end	Night	48% 9% 13% 21% 9% 1	3972
June	1st to 10th	Night	51% 8% 11% 20% 9% 1	1423
	11th to 20th	Night	44% 6% 16% 20% 12% 2	1400
	21st to end	Night	52% 7% 11% 19% 10% 2	1437
July	1st to 10th	Night	46% 7% 15% 23% 9%	3560
	11th to 20th	Night	48% 6% 13% 22% 10%	3552
	21st to end	Night	36% 6% 17% 29% 10% 1	3809
August	1st to 10th	Night	53% 7% 13% 20% 7%	2900
	11th to 20th	Night	48% 8% 15% 19% 10%	2899
	21st to end	Night	33% 7% 14% 26% 19% 1	3313
September	1st to 10th	Night	34% 7% 13% 29% 17% 1	2076
	11th to 20th	Night	33% 5% 13% 28% 21% 2	2200
	21st to end	Night	39% 5% 10% 29% 15% 2	2200
October	1st to 10th	Night	41% 5% 13% 24% 15% 1	3641
	11th to 20th	Night	35% 4 9% 28% 22% 1	3963
	21st to end	Night	39% 4 11% 28% 17% 2	4610
November	1st to 10th	Night	40% 6% 11% 25% 16% 2	2667
	11th to 20th	Night	41% 5% 10% 23% 18% 2	2730
	21st to end	Night	44% 5% 15% 20% 15% 2	2884
December	1st to 10th	Night	46% 4 9% 29% 12%	4948
	11th to 20th	Night	45% 4 10% 18% 19% 3	5742
	21st to end	Night	50% 4 9% 18% 17% 1	7385

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% 24% 30% 16% 3	220
	11th to 20th	Day	30% 25% 28% 13% 2 1	220
	21st to end	Day	19% 31% 31% 17% 2	247
February	1st to 10th	Day	26% 22% 32% 18% 2	430
	11th to 20th	Day	26% 28% 32% 11% 2	509
	21st to end	Day	22% 25% 35% 15% 3	446
March	1st to 10th	Day	28% 25% 31% 13% 2	508
	11th to 20th	Day	23% 28% 32% 14% 3 1	500
	21st to end	Day	30% 26% 27% 11% 5% 1	550
April	1st to 10th	Day	32% 25% 28% 10% 5% 1	500
	11th to 20th	Day	30% 26% 26% 13% 3 1	492
	21st to end	Day	27% 22% 33% 13% 3 1	500
May	1st to 10th	Day	31% 22% 30% 14% 3 1	503
	11th to 20th	Day	19% 20% 38% 18% 5% 1	527
	21st to end	Day	20% 20% 35% 19% 5% 1	573
June	1st to 10th	Day	24% 14% 33% 19% 9% 1	701
	11th to 20th	Day	20% 16% 33% 19% 11% 1	730
	21st to end	Day	26% 11% 32% 22% 8% 1	686
July	1st to 10th	Day	19% 9% 41% 21% 8% 2	525
	11th to 20th	Day	18% 8% 39% 23% 10% 2	524
	21st to end	Day	17% 9% 38% 24% 11% 2	576
August	1st to 10th	Day	14% 8% 35% 30% 12% 2	526
	11th to 20th	Day	17% 8% 30% 30% 11% 4	519
	21st to end	Day	14% 13% 34% 25% 11% 3	583
September	1st to 10th	Day	15% 11% 33% 26% 13% 2	530
	11th to 20th	Day	16% 12% 31% 21% 13% 7%	530
	21st to end	Day	17% 16% 31% 21% 10% 5%	530
October	1st to 10th	Day	19% 15% 26% 25% 12% 3	515
	11th to 20th	Day	22% 19% 30% 19% 7% 3	420
	21st to end	Day	30% 14% 30% 21% 5% 1	462
November	1st to 10th	Day	22% 23% 28% 20% 6% 2	425
	11th to 20th	Day	26% 21% 30% 18% 4 1	430
	21st to end	Day	27% 24% 27% 16% 6%	430
December	1st to 10th	Day	25% 20% 35% 16% 4	288
	11th to 20th	Day	34% 25% 30% 10% 1	220
	21st to end	Day	31% 24% 28% 12% 3	242
January	1st to 10th	Night	23% 20% 36% 20% 2	840
	11th to 20th	Night	28% 20% 31% 16% 5%	840
	21st to end	Night	19% 21% 38% 19% 3	924
February	1st to 10th	Night	23% 20% 34% 20% 3	840
	11th to 20th	Night	21% 22% 39% 15% 3	823
	21st to end	Night	23% 19% 35% 21% 3	692
March	1st to 10th	Night	26% 20% 36% 16% 2	809
	11th to 20th	Night	21% 19% 34% 20% 5%	800
	21st to end	Night	25% 17% 33% 20% 4	880
April	1st to 10th	Night	29% 18% 32% 17% 3	800
	11th to 20th	Night	25% 14% 34% 23% 4	648
	21st to end	Night	29% 13% 31% 23% 4	600
May	1st to 10th	Night	27% 10% 32% 26% 5% 1	600
	11th to 20th	Night	25% 10% 34% 26% 5%	592
	21st to end	Night	23% 8% 31% 32% 6% 1	452
June	1st to 10th	Night	26% 7% 26% 31% 10%	400
	11th to 20th	Night	18% 8% 27% 35% 12% 1	400
	21st to end	Night	25% 6% 30% 34% 6%	400
July	1st to 10th	Night	22% 4 23% 41% 11%	390
	11th to 20th	Night	19% 3 24% 39% 14% 1	388
	21st to end	Night	16% 3 27% 39% 13% 1	438
August	1st to 10th	Night	16% 5% 26% 39% 13%	594
	11th to 20th	Night	16% 5% 27% 36% 15% 1	592
	21st to end	Night	15% 6% 27% 36% 15% 1	711
September	1st to 10th	Night	13% 5% 32% 34% 15% 1	800
	11th to 20th	Night	17% 8% 26% 28% 17% 4	800
	21st to end	Night	18% 10% 30% 29% 13% 2	800
October	1st to 10th	Night	21% 11% 25% 27% 15% 1	800
	11th to 20th	Night	21% 12% 31% 25% 10% 2	800
	21st to end	Night	29% 13% 29% 23% 5%	880
November	1st to 10th	Night	25% 14% 29% 25% 6% 1	820
	11th to 20th	Night	23% 16% 33% 21% 6% 1	840
	21st to end	Night	23% 21% 31% 20% 5%	922
December	1st to 10th	Night	26% 16% 37% 16% 5%	950
	11th to 20th	Night	26% 23% 32% 16% 3	950
	21st to end	Night	27% 20% 32% 18% 3	979

Page generated at 2026-02-28 01:40:25. Version ac07

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