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 2024-12-02.

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	19% 8% 2 6% 4 4 4 4 5% 7% 37%	101282
	Night	18% 8% 3 7% 4 4 4 3 5% 6% 37%	98340
Transparency	Day	45% 6% 12% 21% 13% 2	104808
	Night	46% 6% 12% 21% 13% 2	102891
Seeing	Day	22% 18% 32% 19% 7% 1	15584
	Night	23% 14% 32% 24% 7% 1	24124

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	17% 7% 2 7% 4 4 4 3 5% 6% 41%	2517
	11th to 20th	Day	17% 7% 2 5% 4 3 4 3 4 7% 43%	2520
	21st to end	Day	17% 12% 3 7% 4 3 3 3 4 6% 37%	2776
February	1st to 10th	Day	18% 10% 3 7% 5% 4 4 3 5% 5% 36%	1710
	11th to 20th	Day	13% 10% 4 7% 5% 5% 5% 4 4 6% 37%	1800
	21st to end	Day	16% 10% 4 8% 4 4 5% 4 5% 5% 36%	1570
March	1st to 10th	Day	25% 13% 3 7% 5% 4 4 3 4 4 30%	3116
	11th to 20th	Day	18% 9% 2 7% 6% 4 5% 3 4 5% 36%	3468
	21st to end	Day	25% 9% 2 7% 3 3 4 3 6% 6% 31%	3838
April	1st to 10th	Day	20% 11% 3 8% 5% 4 4 3 5% 5% 34%	2280
	11th to 20th	Day	20% 7% 2 6% 4 4 4 3 5% 7% 38%	2390
	21st to end	Day	22% 9% 3 6% 4 4 5% 3 5% 5% 34%	2470
May	1st to 10th	Day	22% 10% 2 7% 5% 5% 4 4 5% 6% 29%	4106
	11th to 20th	Day	19% 9% 3 7% 5% 5% 5% 4 5% 7% 32%	4081
	21st to end	Day	16% 7% 2 5% 4 4 4 4 6% 9% 37%	4834
June	1st to 10th	Day	23% 7% 2 7% 4 4 4 4 5% 7% 32%	2822
	11th to 20th	Day	18% 7% 2 6% 4 4 4 4 5% 8% 38%	2850
	21st to end	Day	24% 8% 2 6% 5% 5% 5% 4 6% 6% 30%	2808
July	1st to 10th	Day	15% 6% 2 7% 5% 5% 5% 4 7% 9% 35%	4440
	11th to 20th	Day	15% 6% 2 5% 4 4 5% 4 6% 10% 38%	4440
	21st to end	Day	21% 7% 3 6% 4 4 3 4 6% 7% 36%	4784
August	1st to 10th	Day	18% 7% 3 7% 4 4 5% 5% 6% 7% 33%	4105
	11th to 20th	Day	16% 8% 4 8% 4 5% 5% 4 5% 6% 34%	4045
	21st to end	Day	10% 6% 2 5% 4 4 4 4 7% 8% 45%	4441
September	1st to 10th	Day	12% 6% 1 5% 3 4 4 4 5% 7% 49%	2207
	11th to 20th	Day	13% 5% 2 4 3 3 4 2 4 6% 54%	2090
	21st to end	Day	19% 5% 2 5% 3 4 3 3 5% 8% 44%	2090
October	1st to 10th	Day	18% 7% 2 6% 5% 4 4 3 4 6% 40%	2066
	11th to 20th	Day	19% 6% 2 6% 4 5% 3 3 4 6% 42%	1857
	21st to end	Day	22% 8% 3 6% 4 3 4 3 4 5% 39%	1881
November	1st to 10th	Day	17% 6% 2 6% 4 5% 3 3 5% 6% 43%	1761
	11th to 20th	Day	20% 5% 2 5% 3 3 4 3 5% 6% 44%	1800
	21st to end	Day	20% 10% 2 5% 3 3 3 3 4 5% 43%	1650
December	1st to 10th	Day	21% 11% 2 6% 5% 3 4 3 3 6% 35%	1401
	11th to 20th	Day	22% 10% 3 5% 4 3 3 3 4 5% 39%	1668
	21st to end	Day	26% 11% 3 6% 4 4 4 3 5% 4 31%	2600
January	1st to 10th	Night	14% 10% 3 7% 4 4 4 3 5% 5% 41%	4429
	11th to 20th	Night	14% 9% 3 9% 5% 4 4 4 5% 6% 37%	4440
	21st to end	Night	16% 12% 4 9% 4 4 4 3 4 6% 34%	4880
February	1st to 10th	Night	16% 9% 3 7% 6% 5% 5% 4 5% 6% 34%	2470
	11th to 20th	Night	13% 9% 3 8% 5% 5% 4 3 5% 6% 39%	2261
	21st to end	Night	13% 11% 4 7% 5% 5% 4 3 4 6% 40%	1884
March	1st to 10th	Night	28% 13% 3 6% 3 3 3 2 4 5% 30%	3724
	11th to 20th	Night	14% 10% 3 8% 6% 5% 6% 4 6% 6% 31%	3490
	21st to end	Night	26% 10% 2 7% 4 4 4 4 6% 5% 29%	3790
April	1st to 10th	Night	22% 11% 2 6% 4 4 4 3 5% 5% 34%	1900
	11th to 20th	Night	19% 8% 3 6% 4 4 4 5% 5% 8% 35%	1739
	21st to end	Night	21% 10% 3 6% 5% 4 4 3 5% 5% 35%	1710
May	1st to 10th	Night	24% 8% 3 6% 4 3 4 3 6% 9% 30%	2834
	11th to 20th	Night	17% 8% 3 8% 6% 5% 6% 5% 7% 8% 28%	2813
	21st to end	Night	16% 7% 3 7% 6% 5% 5% 4 6% 8% 36%	2769
June	1st to 10th	Night	22% 8% 3 7% 4 4 5% 4 6% 7% 30%	1352
	11th to 20th	Night	16% 8% 2 6% 5% 5% 4 3 5% 8% 39%	1330
	21st to end	Night	24% 8% 3 7% 4 4 5% 3 6% 7% 29%	1365
July	1st to 10th	Night	15% 7% 3 6% 5% 5% 6% 5% 7% 9% 32%	2520
	11th to 20th	Night	15% 6% 2 8% 5% 5% 5% 4 5% 8% 37%	2520
	21st to end	Night	15% 7% 2 6% 4 4 4 4 6% 9% 39%	2739
August	1st to 10th	Night	22% 7% 2 8% 5% 5% 5% 4 5% 7% 30%	2821
	11th to 20th	Night	16% 9% 3 7% 5% 4 5% 4 5% 8% 32%	2782
	21st to end	Night	10% 5% 3 6% 4 4 4 3 6% 8% 47%	3211
September	1st to 10th	Night	12% 4 2 5% 4 4 4 4 4 6% 51%	1972
	11th to 20th	Night	15% 7% 2 4 2 2 3 2 4 7% 52%	2090
	21st to end	Night	16% 6% 2 6% 4 3 4 3 4 7% 46%	2090
October	1st to 10th	Night	19% 5% 2 6% 5% 4 5% 3 5% 7% 40%	2114
	11th to 20th	Night	18% 5% 2 6% 4 4 4 3 6% 6% 42%	2318
	21st to end	Night	23% 8% 2 5% 4 3 4 3 4 5% 38%	2717
November	1st to 10th	Night	17% 6% 2 6% 4 3 4 4 5% 6% 43%	2537
	11th to 20th	Night	17% 6% 2 5% 4 4 4 3 5% 6% 43%	2600
	21st to end	Night	18% 7% 2 6% 4 3 4 4 5% 6% 41%	2746
December	1st to 10th	Night	21% 10% 3 6% 4 4 4 4 5% 5% 35%	2808
	11th to 20th	Night	23% 8% 2 5% 4 3 3 3 4 6% 39%	3531
	21st to end	Night	24% 10% 3 6% 4 3 4 3 4 5% 35%	5044

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	44% 4 13% 27% 11% 1	2518
	11th to 20th	Day	42% 6% 12% 26% 12% 2	2520
	21st to end	Day	48% 5% 13% 20% 13% 1	2776
February	1st to 10th	Day	49% 5% 11% 19% 14% 2	1710
	11th to 20th	Day	47% 6% 11% 19% 14% 3	1809
	21st to end	Day	48% 6% 10% 20% 11% 5%	1570
March	1st to 10th	Day	58% 5% 8% 12% 14% 3	3119
	11th to 20th	Day	47% 7% 11% 20% 13% 3	3468
	21st to end	Day	52% 4 7% 15% 17% 5%	3838
April	1st to 10th	Day	52% 5% 8% 17% 15% 4	2280
	11th to 20th	Day	45% 6% 9% 22% 15% 2	2390
	21st to end	Day	51% 5% 8% 18% 14% 3	2470
May	1st to 10th	Day	52% 10% 11% 17% 8% 1	4120
	11th to 20th	Day	48% 9% 14% 19% 9% 1	4085
	21st to end	Day	41% 9% 16% 19% 14% 1	4834
June	1st to 10th	Day	51% 7% 12% 21% 9%	2822
	11th to 20th	Day	45% 6% 12% 19% 15% 2	2850
	21st to end	Day	52% 10% 11% 17% 10% 1	2808
July	1st to 10th	Day	44% 7% 13% 25% 11%	4370
	11th to 20th	Day	40% 7% 17% 25% 10% 1	4365
	21st to end	Day	47% 7% 12% 21% 13% 1	4631
August	1st to 10th	Day	47% 8% 15% 24% 7%	4092
	11th to 20th	Day	47% 8% 16% 21% 8%	4084
	21st to end	Day	32% 8% 14% 26% 19% 1	4441
September	1st to 10th	Day	34% 7% 14% 27% 18% 1	2207
	11th to 20th	Day	33% 4 12% 28% 20% 3	2090
	21st to end	Day	40% 6% 11% 27% 16% 1	2090
October	1st to 10th	Day	50% 6% 9% 22% 11% 1	3430
	11th to 20th	Day	34% 3 10% 30% 22%	3060
	21st to end	Day	36% 3 14% 25% 20% 3	3081
November	1st to 10th	Day	41% 5% 13% 23% 16% 2	1761
	11th to 20th	Day	41% 5% 11% 21% 19% 3	1800
	21st to end	Day	44% 4 16% 23% 12% 1	1650
December	1st to 10th	Day	51% 5% 9% 22% 12% 1	1401
	11th to 20th	Day	48% 5% 9% 21% 14% 4	1668
	21st to end	Day	56% 5% 10% 17% 9% 2	2600
January	1st to 10th	Night	44% 6% 12% 27% 10% 2	4429
	11th to 20th	Night	47% 7% 12% 20% 11% 2	4440
	21st to end	Night	52% 4 10% 20% 12% 1	4880
February	1st to 10th	Night	49% 6% 12% 18% 13% 3	2470
	11th to 20th	Night	46% 5% 9% 21% 16% 3	2263
	21st to end	Night	46% 5% 9% 20% 15% 5%	1884
March	1st to 10th	Night	57% 3 9% 15% 11% 4	3734
	11th to 20th	Night	48% 8% 12% 20% 10% 2	3491
	21st to end	Night	56% 4 7% 15% 16% 3	3790
April	1st to 10th	Night	51% 4 9% 17% 15% 4	1900
	11th to 20th	Night	47% 5% 9% 23% 15% 1	1739
	21st to end	Night	50% 5% 12% 16% 14% 3	1710
May	1st to 10th	Night	50% 8% 16% 18% 7% 1	2840
	11th to 20th	Night	50% 9% 15% 17% 7% 2	2814
	21st to end	Night	44% 10% 14% 19% 12% 1	2770
June	1st to 10th	Night	51% 9% 11% 20% 8% 1	1352
	11th to 20th	Night	44% 6% 16% 20% 12% 2	1330
	21st to end	Night	53% 7% 11% 18% 9% 2	1365
July	1st to 10th	Night	45% 8% 15% 20% 11%	2480
	11th to 20th	Night	45% 7% 14% 24% 9%	2472
	21st to end	Night	41% 6% 14% 25% 12% 1	2651
August	1st to 10th	Night	53% 8% 13% 19% 7%	2810
	11th to 20th	Night	49% 8% 15% 18% 10%	2809
	21st to end	Night	33% 7% 14% 26% 19% 1	3211
September	1st to 10th	Night	35% 7% 13% 28% 16% 1	1972
	11th to 20th	Night	34% 4 13% 28% 20% 2	2090
	21st to end	Night	39% 5% 10% 29% 15% 2	2090
October	1st to 10th	Night	42% 6% 14% 23% 14% 1	3530
	11th to 20th	Night	34% 5% 9% 28% 22% 1	3841
	21st to end	Night	38% 4 11% 28% 17% 2	4467
November	1st to 10th	Night	40% 6% 12% 26% 15% 1	2537
	11th to 20th	Night	41% 5% 10% 23% 18% 3	2600
	21st to end	Night	44% 5% 14% 20% 15% 2	2746
December	1st to 10th	Night	51% 5% 9% 22% 12% 1	2808
	11th to 20th	Night	46% 6% 10% 20% 17% 1	3532
	21st to end	Night	52% 6% 11% 18% 12% 1	5044

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	27% 23% 28% 19% 3	180
	11th to 20th	Day	29% 27% 27% 13% 2 2	180
	21st to end	Day	18% 27% 34% 19% 2	202
February	1st to 10th	Day	26% 23% 31% 18% 2	370
	11th to 20th	Day	26% 29% 31% 12% 2	433
	21st to end	Day	23% 23% 35% 16% 3	382
March	1st to 10th	Day	27% 24% 33% 14% 2	460
	11th to 20th	Day	22% 27% 33% 15% 3 1	460
	21st to end	Day	29% 26% 26% 12% 5% 2	506
April	1st to 10th	Day	30% 25% 28% 11% 5% 1	460
	11th to 20th	Day	28% 26% 27% 14% 4 1	452
	21st to end	Day	27% 23% 33% 13% 4 1	460
May	1st to 10th	Day	29% 22% 31% 14% 3 1	463
	11th to 20th	Day	18% 21% 39% 17% 5% 1	487
	21st to end	Day	19% 20% 37% 19% 5% 1	529
June	1st to 10th	Day	24% 15% 32% 19% 10% 1	652
	11th to 20th	Day	19% 16% 33% 19% 12% 1	680
	21st to end	Day	26% 11% 31% 23% 8% 1	638
July	1st to 10th	Day	19% 8% 41% 21% 8% 2	485
	11th to 20th	Day	16% 8% 40% 23% 11% 2	484
	21st to end	Day	17% 8% 39% 23% 11% 2	532
August	1st to 10th	Day	15% 8% 34% 29% 12% 1	486
	11th to 20th	Day	18% 8% 30% 30% 10% 3	479
	21st to end	Day	14% 12% 33% 25% 12% 4	539
September	1st to 10th	Day	15% 12% 33% 26% 13% 2	490
	11th to 20th	Day	17% 12% 31% 20% 13% 7%	490
	21st to end	Day	17% 17% 30% 22% 10% 4	490
October	1st to 10th	Day	19% 16% 27% 25% 11% 3	477
	11th to 20th	Day	22% 19% 30% 20% 7% 3	390
	21st to end	Day	31% 14% 29% 21% 5%	429
November	1st to 10th	Day	21% 22% 29% 20% 6% 2	395
	11th to 20th	Day	27% 20% 30% 18% 3 1	400
	21st to end	Day	27% 24% 27% 16% 6%	400
December	1st to 10th	Day	25% 19% 36% 14% 5%	246
	11th to 20th	Day	33% 26% 31% 9% 1 1	180
	21st to end	Day	30% 28% 27% 12% 4	198
January	1st to 10th	Night	22% 20% 36% 20% 2	760
	11th to 20th	Night	28% 20% 32% 16% 4	760
	21st to end	Night	19% 21% 38% 19% 3	836
February	1st to 10th	Night	23% 20% 35% 19% 3	760
	11th to 20th	Night	21% 22% 38% 15% 3	743
	21st to end	Night	23% 19% 34% 21% 3	628
March	1st to 10th	Night	25% 19% 37% 17% 2	760
	11th to 20th	Night	21% 19% 34% 20% 5%	760
	21st to end	Night	25% 17% 34% 19% 4	836
April	1st to 10th	Night	28% 18% 33% 18% 4	760
	11th to 20th	Night	24% 13% 34% 23% 5%	615
	21st to end	Night	28% 13% 31% 23% 4	570
May	1st to 10th	Night	26% 10% 32% 27% 5% 1	570
	11th to 20th	Night	24% 10% 35% 26% 5%	562
	21st to end	Night	23% 7% 30% 32% 6% 1	429
June	1st to 10th	Night	27% 7% 26% 31% 10%	380
	11th to 20th	Night	18% 8% 26% 35% 12% 1	380
	21st to end	Night	26% 5% 30% 33% 6%	380
July	1st to 10th	Night	22% 4 22% 40% 11%	370
	11th to 20th	Night	19% 3 24% 39% 13% 1	368
	21st to end	Night	17% 3 26% 40% 13% 1	416
August	1st to 10th	Night	16% 5% 26% 39% 13%	564
	11th to 20th	Night	17% 5% 28% 36% 14% 1	562
	21st to end	Night	15% 5% 27% 36% 16% 1	675
September	1st to 10th	Night	13% 6% 33% 34% 14% 1	760
	11th to 20th	Night	18% 9% 26% 27% 17% 4	760
	21st to end	Night	18% 10% 30% 27% 13% 2	760
October	1st to 10th	Night	22% 10% 25% 27% 15% 1	760
	11th to 20th	Night	21% 12% 31% 25% 10% 2	760
	21st to end	Night	29% 14% 29% 22% 5%	836
November	1st to 10th	Night	24% 13% 29% 26% 7% 2	780
	11th to 20th	Night	23% 16% 34% 21% 6% 1	800
	21st to end	Night	23% 21% 30% 20% 5%	874
December	1st to 10th	Night	26% 16% 37% 15% 6%	859
	11th to 20th	Night	25% 22% 32% 17% 3	850
	21st to end	Night	27% 20% 32% 18% 3	881

Page generated at 2024-11-29 10:43:08. Version ac07

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