Millersburg
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Millersburg clear sky chart from 2005-11-06 to 2024-11-04.

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	14% 8% 3 7% 5% 4 4 4 6% 7% 37%	101308
	Night	14% 9% 3 7% 4 4 4 4 5% 7% 39%	97624
Transparency	Day	43% 7% 11% 23% 15% 2	105026
	Night	42% 7% 11% 22% 16% 3	102032
Seeing	Day	18% 12% 25% 22% 15% 7%	14982
	Night	18% 10% 25% 29% 16% 2	24782

By Month

Percentage Cloud Cover SE (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	15% 15% 5% 9% 5% 4 5% 4 6% 7% 25%	2836
	11th to 20th	Day	17% 13% 5% 16% 5% 6% 3 2 4 4 26%	2840
	21st to end	Day	27% 15% 8% 7% 4 3 3 3 4 5% 22%	3124
February	1st to 10th	Day	19% 12% 4 10% 6% 4 4 3 4 6% 30%	1819
	11th to 20th	Day	18% 11% 4 8% 5% 5% 3 3 5% 5% 32%	1848
	21st to end	Day	20% 11% 4 8% 4 4 4 4 6% 5% 31%	1570
March	1st to 10th	Day	23% 14% 3 7% 4 3 3 3 4 5% 30%	3179
	11th to 20th	Day	15% 6% 2 6% 4 4 4 3 5% 8% 44%	3480
	21st to end	Day	15% 8% 3 7% 5% 4 4 4 6% 7% 37%	3815
April	1st to 10th	Day	14% 9% 3 7% 4 4 4 4 6% 6% 38%	2204
	11th to 20th	Day	17% 8% 3 5% 4 4 4 4 5% 7% 39%	2304
	21st to end	Day	17% 7% 3 7% 5% 5% 5% 3 5% 7% 37%	2470
May	1st to 10th	Day	19% 9% 3 7% 5% 5% 5% 4 6% 7% 30%	4082
	11th to 20th	Day	18% 8% 3 7% 4 4 4 3 5% 7% 36%	4081
	21st to end	Day	10% 6% 3 7% 5% 5% 5% 5% 8% 10% 36%	4476
June	1st to 10th	Day	11% 5% 2 6% 5% 6% 4 5% 6% 8% 42%	2470
	11th to 20th	Day	8% 5% 2 6% 5% 5% 6% 4 7% 9% 42%	2470
	21st to end	Day	9% 6% 2 7% 5% 5% 5% 4 6% 10% 41%	2624
July	1st to 10th	Day	12% 6% 2 6% 5% 5% 5% 4 7% 10% 39%	4258
	11th to 20th	Day	7% 5% 2 5% 5% 6% 5% 4 7% 10% 42%	4120
	21st to end	Day	15% 10% 4 10% 7% 7% 6% 5% 6% 7% 25%	4466
August	1st to 10th	Day	8% 5% 2 7% 4 5% 5% 5% 7% 11% 43%	4104
	11th to 20th	Day	9% 6% 2 7% 5% 5% 5% 4 8% 11% 38%	4044
	21st to end	Day	6% 4 1 5% 4 4 5% 3 6% 9% 54%	4196
September	1st to 10th	Day	15% 5% 2 5% 4 4 5% 4 6% 7% 44%	2138
	11th to 20th	Day	11% 5% 2 5% 4 4 4 4 5% 8% 48%	2090
	21st to end	Day	15% 7% 2 6% 3 3 4 2 4 7% 46%	2090
October	1st to 10th	Day	11% 5% 2 4 3 3 4 3 5% 7% 53%	2090
	11th to 20th	Day	14% 5% 2 5% 4 4 3 3 5% 6% 50%	1924
	21st to end	Day	18% 8% 3 5% 4 3 3 2 6% 6% 43%	1990
November	1st to 10th	Day	12% 5% 2 5% 4 4 2 3 4 5% 55%	1699
	11th to 20th	Day	15% 10% 3 6% 5% 3 4 3 5% 5% 42%	1710
	21st to end	Day	18% 10% 3 6% 4 3 3 3 5% 6% 39%	1710
December	1st to 10th	Day	22% 14% 3 7% 4 3 4 3 4 5% 29%	1710
	11th to 20th	Day	15% 13% 3 8% 5% 5% 5% 4 5% 4 32%	2153
	21st to end	Day	19% 17% 5% 9% 6% 5% 5% 3 5% 6% 21%	3124
January	1st to 10th	Night	15% 15% 5% 10% 6% 5% 4 4 5% 6% 26%	4109
	11th to 20th	Night	17% 14% 6% 13% 5% 3 4 3 4 4 27%	4120
	21st to end	Night	24% 14% 5% 8% 4 3 3 2 4 5% 27%	4532
February	1st to 10th	Night	22% 11% 5% 8% 4 4 4 3 5% 5% 29%	2357
	11th to 20th	Night	19% 11% 4 8% 5% 5% 3 3 4 6% 32%	2218
	21st to end	Night	21% 13% 4 7% 5% 3 4 3 5% 5% 29%	1884
March	1st to 10th	Night	20% 14% 3 7% 4 4 3 4 4 5% 33%	3674
	11th to 20th	Night	14% 7% 2 5% 3 3 3 3 5% 6% 48%	3480
	21st to end	Night	13% 8% 3 7% 4 4 4 4 6% 7% 38%	3817
April	1st to 10th	Night	12% 6% 2 7% 6% 5% 4 4 7% 7% 40%	1990
	11th to 20th	Night	15% 7% 3 6% 4 4 5% 3 5% 6% 44%	1823
	21st to end	Night	15% 8% 3 5% 4 4 5% 4 5% 6% 40%	1710
May	1st to 10th	Night	18% 11% 3 8% 5% 6% 5% 4 6% 7% 27%	2813
	11th to 20th	Night	18% 8% 2 5% 4 4 5% 4 6% 7% 37%	2812
	21st to end	Night	7% 5% 3 6% 4 5% 5% 4 7% 10% 44%	3079
June	1st to 10th	Night	8% 5% 1 5% 5% 4 5% 5% 7% 10% 46%	1710
	11th to 20th	Night	5% 4 2 4 4 4 5% 5% 8% 10% 47%	1710
	21st to end	Night	7% 4 2 5% 4 5% 6% 4 8% 10% 45%	1542
July	1st to 10th	Night	7% 5% 2 6% 5% 5% 4 4 6% 10% 43%	2680
	11th to 20th	Night	6% 5% 2 6% 5% 4 5% 4 7% 8% 49%	2840
	21st to end	Night	13% 8% 4 8% 6% 4 4 4 6% 8% 34%	3087
August	1st to 10th	Night	7% 5% 2 5% 5% 4 4 5% 7% 10% 46%	2825
	11th to 20th	Night	7% 6% 3 6% 5% 5% 5% 5% 7% 9% 44%	2785
	21st to end	Night	4 3 1 4 3 3 4 3 5% 9% 60%	3442
September	1st to 10th	Night	12% 5% 2 4 3 4 4 3 5% 9% 49%	2022
	11th to 20th	Night	10% 5% 2 5% 3 4 3 3 4 7% 53%	2090
	21st to end	Night	13% 6% 3 6% 4 4 3 3 5% 6% 48%	2090
October	1st to 10th	Night	10% 4 1 5% 2 3 4 3 5% 8% 56%	2090
	11th to 20th	Night	13% 6% 2 5% 4 3 4 3 5% 7% 48%	2254
	21st to end	Night	16% 8% 2 6% 4 4 3 3 4 6% 44%	2603
November	1st to 10th	Night	12% 6% 2 6% 4 4 4 3 5% 5% 51%	2452
	11th to 20th	Night	15% 8% 3 6% 4 3 4 3 3 6% 43%	2470
	21st to end	Night	17% 11% 3 6% 4 3 4 3 5% 5% 39%	2470
December	1st to 10th	Night	22% 11% 4 7% 3 4 4 3 5% 6% 32%	2470
	11th to 20th	Night	18% 9% 4 8% 5% 4 3 4 4 7% 34%	3042
	21st to end	Night	18% 16% 4 11% 7% 5% 5% 4 5% 6% 20%	4532

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% 8% 12% 16% 9% 1	2837
	11th to 20th	Day	62% 5% 8% 18% 6% 1	2840
	21st to end	Day	65% 4 7% 19% 3 1	3124
February	1st to 10th	Day	56% 5% 9% 18% 10% 2	1819
	11th to 20th	Day	54% 5% 9% 19% 10% 3	1858
	21st to end	Day	54% 6% 9% 20% 10% 3	1570
March	1st to 10th	Day	54% 7% 8% 17% 10% 4	3179
	11th to 20th	Day	37% 7% 13% 25% 17% 1	3480
	21st to end	Day	43% 8% 12% 24% 11% 1	3815
April	1st to 10th	Day	44% 6% 10% 24% 12% 3	2204
	11th to 20th	Day	44% 6% 9% 22% 15% 4	2304
	21st to end	Day	46% 7% 12% 22% 11% 2	2470
May	1st to 10th	Day	50% 9% 13% 20% 7% 1	4120
	11th to 20th	Day	47% 8% 11% 21% 12% 1	4085
	21st to end	Day	36% 12% 16% 18% 16% 2	4489
June	1st to 10th	Day	38% 10% 11% 23% 17% 1	2470
	11th to 20th	Day	36% 10% 14% 23% 16% 2	2470
	21st to end	Day	37% 9% 14% 21% 16% 3	2624
July	1st to 10th	Day	39% 8% 13% 22% 17% 1	4193
	11th to 20th	Day	33% 8% 12% 31% 14% 1	4051
	21st to end	Day	55% 7% 11% 14% 10% 2	4324
August	1st to 10th	Day	32% 8% 14% 34% 11% 1	4091
	11th to 20th	Day	36% 8% 12% 30% 14% 1	4083
	21st to end	Day	26% 7% 15% 30% 19% 3	4195
September	1st to 10th	Day	38% 8% 12% 18% 19% 5%	2138
	11th to 20th	Day	34% 7% 11% 22% 23% 3	2090
	21st to end	Day	38% 5% 9% 24% 20% 3	2090
October	1st to 10th	Day	21% 4 8% 27% 37% 3	3480
	11th to 20th	Day	25% 4 10% 28% 30% 2	3177
	21st to end	Day	31% 4 9% 29% 22% 5%	3253
November	1st to 10th	Day	33% 4 8% 27% 23% 4	1699
	11th to 20th	Day	43% 4 10% 21% 19% 4	1710
	21st to end	Day	46% 5% 9% 20% 17% 2	1710
December	1st to 10th	Day	57% 6% 10% 17% 9% 1	1710
	11th to 20th	Day	53% 7% 9% 17% 14% 1	2150
	21st to end	Day	61% 8% 11% 13% 6% 1	3124
January	1st to 10th	Night	56% 9% 9% 15% 10% 1	4109
	11th to 20th	Night	60% 6% 8% 17% 8% 2	4120
	21st to end	Night	60% 6% 8% 17% 8% 1	4532
February	1st to 10th	Night	56% 5% 10% 19% 9% 1	2357
	11th to 20th	Night	54% 4 9% 20% 11% 1	2219
	21st to end	Night	57% 4 12% 14% 10% 3	1884
March	1st to 10th	Night	52% 6% 8% 21% 11% 1	3674
	11th to 20th	Night	35% 6% 12% 27% 17% 2	3480
	21st to end	Night	41% 9% 11% 23% 15% 1	3817
April	1st to 10th	Night	38% 8% 12% 22% 16% 2	1990
	11th to 20th	Night	40% 6% 9% 19% 19% 6%	1823
	21st to end	Night	42% 7% 13% 22% 13% 3	1710
May	1st to 10th	Night	53% 11% 10% 18% 7% 2	2840
	11th to 20th	Night	43% 9% 13% 24% 10% 1	2813
	21st to end	Night	30% 12% 15% 22% 17% 4	3087
June	1st to 10th	Night	30% 8% 15% 27% 15% 4	1710
	11th to 20th	Night	28% 11% 16% 24% 19% 3	1710
	21st to end	Night	30% 10% 17% 22% 17% 4	1542
July	1st to 10th	Night	35% 9% 13% 22% 18% 3	2636
	11th to 20th	Night	30% 8% 14% 29% 17% 2	2786
	21st to end	Night	47% 7% 12% 19% 13% 2	2988
August	1st to 10th	Night	32% 8% 15% 32% 13% 1	2814
	11th to 20th	Night	34% 9% 12% 27% 17% 1	2812
	21st to end	Night	20% 6% 15% 33% 21% 4	3442
September	1st to 10th	Night	32% 7% 15% 21% 18% 7%	2022
	11th to 20th	Night	31% 6% 11% 24% 24% 4	2090
	21st to end	Night	37% 6% 8% 21% 24% 3	2090
October	1st to 10th	Night	22% 4 8% 23% 40% 3	3480
	11th to 20th	Night	25% 4 8% 26% 34% 4	3740
	21st to end	Night	31% 3 8% 22% 28% 8%	4277
November	1st to 10th	Night	35% 4 10% 24% 24% 4	2452
	11th to 20th	Night	43% 4 9% 19% 20% 5%	2470
	21st to end	Night	46% 5% 10% 23% 14% 2	2470
December	1st to 10th	Night	53% 6% 11% 19% 11% 1	2470
	11th to 20th	Night	50% 6% 10% 21% 13% 1	3044
	21st to end	Night	61% 9% 10% 13% 6%	4532

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	24% 22% 34% 13% 6%	270
	11th to 20th	Day	33% 24% 30% 11% 1	270
	21st to end	Day	28% 25% 34% 11% 3	297
February	1st to 10th	Day	29% 20% 33% 15% 2	270
	11th to 20th	Day	32% 26% 29% 10% 2	270
	21st to end	Day	35% 17% 39% 6% 4	225
March	1st to 10th	Day	26% 26% 31% 13% 3	303
	11th to 20th	Day	23% 23% 32% 16% 5%	460
	21st to end	Day	28% 20% 31% 14% 7%	506
April	1st to 10th	Day	22% 20% 28% 20% 10% 1	460
	11th to 20th	Day	20% 21% 27% 18% 9% 4	452
	21st to end	Day	22% 16% 34% 17% 9% 2	460
May	1st to 10th	Day	19% 16% 32% 19% 9% 4	463
	11th to 20th	Day	17% 10% 26% 26% 13% 6%	487
	21st to end	Day	13% 9% 23% 25% 21% 9%	529
June	1st to 10th	Day	12% 8% 20% 28% 23% 9%	490
	11th to 20th	Day	10% 6% 21% 29% 25% 9%	490
	21st to end	Day	10% 6% 25% 31% 20% 9%	644
July	1st to 10th	Day	14% 6% 17% 22% 21% 20%	571
	11th to 20th	Day	11% 4 17% 25% 27% 16%	484
	21st to end	Day	12% 3 19% 29% 22% 15%	532
August	1st to 10th	Day	13% 3 17% 25% 26% 16%	486
	11th to 20th	Day	12% 4 19% 31% 22% 12%	479
	21st to end	Day	8% 4 12% 30% 28% 18%	539
September	1st to 10th	Day	14% 4 14% 28% 26% 15%	490
	11th to 20th	Day	12% 3 15% 28% 28% 14%	490
	21st to end	Day	19% 9% 19% 23% 23% 7%	490
October	1st to 10th	Day	12% 5% 23% 31% 22% 8%	490
	11th to 20th	Day	14% 15% 29% 23% 14% 4	490
	21st to end	Day	20% 15% 31% 24% 10% 1	439
November	1st to 10th	Day	16% 14% 32% 24% 11% 4	279
	11th to 20th	Day	24% 19% 28% 21% 7% 1	270
	21st to end	Day	25% 13% 38% 18% 4 1	270
December	1st to 10th	Day	25% 23% 29% 17% 6% 1	270
	11th to 20th	Day	21% 22% 35% 17% 5%	270
	21st to end	Day	29% 20% 37% 12% 2	297
January	1st to 10th	Night	22% 19% 33% 21% 5%	760
	11th to 20th	Night	30% 17% 31% 19% 3	760
	21st to end	Night	24% 15% 35% 24% 2	836
February	1st to 10th	Night	29% 12% 34% 23% 2	760
	11th to 20th	Night	26% 17% 36% 20% 1	743
	21st to end	Night	28% 18% 35% 18% 1	628
March	1st to 10th	Night	23% 16% 33% 23% 6%	760
	11th to 20th	Night	24% 14% 34% 22% 6%	760
	21st to end	Night	21% 13% 32% 27% 7%	836
April	1st to 10th	Night	18% 14% 31% 30% 7%	660
	11th to 20th	Night	16% 13% 30% 27% 13% 1	563
	21st to end	Night	18% 9% 35% 29% 8% 1	570
May	1st to 10th	Night	18% 8% 30% 29% 13% 2	570
	11th to 20th	Night	16% 7% 21% 36% 19% 1	561
	21st to end	Night	9% 5% 20% 34% 28% 4	617
June	1st to 10th	Night	9% 3 18% 41% 26% 3	570
	11th to 20th	Night	8% 2 15% 41% 30% 3	570
	21st to end	Night	8% 3 21% 38% 27% 3	570
July	1st to 10th	Night	11% 3 12% 33% 32% 10%	555
	11th to 20th	Night	6% 3 13% 35% 39% 4	552
	21st to end	Night	11% 2 11% 36% 36% 4	624
August	1st to 10th	Night	9% 2 9% 34% 40% 5%	567
	11th to 20th	Night	7% 4 11% 38% 34% 6%	564
	21st to end	Night	7% 2 10% 31% 43% 7%	627
September	1st to 10th	Night	13% 2 13% 32% 35% 5%	692
	11th to 20th	Night	12% 3 13% 32% 33% 7%	760
	21st to end	Night	15% 5% 20% 32% 26% 3	760
October	1st to 10th	Night	11% 6% 19% 32% 28% 5%	760
	11th to 20th	Night	16% 7% 26% 33% 17% 2	760
	21st to end	Night	20% 11% 30% 25% 12% 1	836
November	1st to 10th	Night	15% 9% 26% 31% 17% 2	755
	11th to 20th	Night	20% 12% 30% 26% 11% 1	760
	21st to end	Night	23% 12% 26% 28% 10% 1	760
December	1st to 10th	Night	27% 14% 29% 24% 5%	760
	11th to 20th	Night	24% 13% 31% 26% 6% 1	760
	21st to end	Night	27% 16% 31% 23% 4	836

Page generated at 2024-11-01 22:47:30. Version ac07

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