Little Black Township
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Little Black Township clear sky chart from 2005-11-06 to 2024-11-02.

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	14% 9% 3 8% 5% 5% 5% 4 6% 7% 35%	101567
	Night	13% 10% 4 9% 5% 4 4 4 5% 6% 36%	97512
Transparency	Day	47% 6% 13% 23% 11% 1	101360
	Night	47% 6% 12% 23% 11% 1	97390
Seeing	Day	16% 10% 30% 26% 14% 4	16015
	Night	17% 8% 32% 31% 11% 1	25867

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	11% 17% 7% 18% 6% 5% 4 4 4 5% 20%	2527
	11th to 20th	Day	7% 14% 6% 16% 6% 8% 8% 7% 7% 5% 15%	2530
	21st to end	Day	11% 19% 7% 16% 6% 5% 4 4 5% 7% 16%	2886
February	1st to 10th	Day	8% 11% 5% 12% 6% 5% 6% 4 5% 7% 31%	1710
	11th to 20th	Day	10% 11% 4 10% 6% 5% 4 5% 6% 7% 32%	1693
	21st to end	Day	12% 13% 4 11% 7% 5% 5% 3 5% 5% 29%	1570
March	1st to 10th	Day	13% 10% 3 5% 4 4 4 2 4 6% 46%	3120
	11th to 20th	Day	9% 9% 4 10% 6% 5% 5% 4 6% 7% 35%	3443
	21st to end	Day	19% 12% 4 12% 6% 4 4 3 4 5% 27%	4055
April	1st to 10th	Day	15% 13% 4 7% 5% 5% 4 4 6% 7% 31%	2280
	11th to 20th	Day	20% 11% 3 9% 5% 4 5% 4 5% 5% 29%	2254
	21st to end	Day	20% 11% 3 7% 6% 5% 5% 4 5% 5% 30%	2370
May	1st to 10th	Day	16% 7% 3 7% 4 4 4 3 5% 7% 40%	4399
	11th to 20th	Day	16% 6% 2 6% 4 4 4 4 6% 7% 42%	4399
	21st to end	Day	17% 8% 3 7% 5% 5% 4 4 6% 6% 35%	4824
June	1st to 10th	Day	14% 6% 2 6% 5% 4 4 3 6% 8% 41%	2660
	11th to 20th	Day	13% 7% 3 7% 6% 6% 5% 4 6% 7% 36%	2660
	21st to end	Day	11% 6% 3 7% 5% 4 5% 4 6% 10% 38%	2660
July	1st to 10th	Day	14% 4 2 6% 5% 4 6% 5% 8% 9% 38%	4440
	11th to 20th	Day	6% 3 1 5% 3 4 4 4 7% 10% 51%	4440
	21st to end	Day	9% 6% 2 6% 4 5% 5% 4 6% 8% 46%	4813
August	1st to 10th	Day	14% 7% 3 6% 4 4 4 3 6% 7% 42%	4371
	11th to 20th	Day	14% 5% 1 6% 3 4 4 4 5% 8% 46%	3981
	21st to end	Day	13% 7% 3 7% 4 5% 5% 4 6% 9% 39%	4180
September	1st to 10th	Day	14% 7% 2 6% 4 3 5% 4 5% 8% 44%	2280
	11th to 20th	Day	12% 5% 2 6% 3 4 4 4 6% 9% 44%	2265
	21st to end	Day	16% 7% 2 7% 3 4 5% 4 5% 6% 39%	2052
October	1st to 10th	Day	16% 6% 2 7% 4 4 4 4 6% 7% 40%	1900
	11th to 20th	Day	19% 12% 3 7% 4 4 5% 3 5% 7% 32%	1900
	21st to end	Day	19% 11% 3 7% 4 5% 3 3 4 6% 32%	1924
November	1st to 10th	Day	13% 10% 3 7% 5% 3 4 3 6% 7% 37%	1681
	11th to 20th	Day	15% 13% 5% 10% 7% 5% 4 4 5% 7% 25%	1559
	21st to end	Day	14% 12% 5% 8% 7% 4 4 3 5% 7% 32%	1520
December	1st to 10th	Day	11% 14% 4 14% 9% 6% 6% 4 5% 5% 23%	1520
	11th to 20th	Day	12% 17% 7% 12% 6% 6% 5% 5% 5% 6% 21%	1918
	21st to end	Day	20% 21% 6% 14% 6% 5% 4 3 4 3 16%	2783
January	1st to 10th	Night	10% 14% 6% 15% 7% 5% 4 3 4 5% 26%	4428
	11th to 20th	Night	8% 13% 5% 16% 9% 7% 7% 6% 7% 5% 18%	4440
	21st to end	Night	11% 18% 9% 15% 5% 5% 4 4 4 5% 20%	4779
February	1st to 10th	Night	7% 13% 5% 11% 6% 5% 6% 4 5% 7% 32%	2470
	11th to 20th	Night	8% 10% 4 10% 5% 5% 5% 5% 5% 7% 36%	2372
	21st to end	Night	13% 12% 4 10% 6% 5% 5% 3 4 5% 33%	1884
March	1st to 10th	Night	9% 8% 2 6% 4 4 4 4 6% 8% 44%	3733
	11th to 20th	Night	8% 8% 4 10% 6% 6% 5% 4 6% 6% 38%	3544
	21st to end	Night	22% 11% 4 12% 5% 4 3 2 4 4 28%	3575
April	1st to 10th	Night	19% 11% 3 8% 4 4 4 3 4 7% 34%	1900
	11th to 20th	Night	22% 8% 2 6% 4 3 5% 4 4 6% 37%	1875
	21st to end	Night	18% 10% 2 6% 4 4 3 4 6% 7% 35%	1805
May	1st to 10th	Night	17% 10% 2 6% 5% 4 5% 4 6% 7% 35%	2506
	11th to 20th	Night	12% 6% 3 6% 4 3 3 3 5% 7% 48%	2506
	21st to end	Night	13% 7% 3 7% 5% 5% 5% 3 5% 7% 41%	2743
June	1st to 10th	Night	12% 6% 2 5% 4 4 4 3 6% 8% 45%	1520
	11th to 20th	Night	11% 7% 2 6% 4 5% 5% 4 7% 8% 41%	1520
	21st to end	Night	9% 6% 2 5% 4 5% 5% 4 7% 9% 46%	1520
July	1st to 10th	Night	13% 5% 2 5% 4 3 5% 4 6% 7% 46%	2530
	11th to 20th	Night	5% 4 1 3 3 4 4 4 5% 9% 57%	2530
	21st to end	Night	6% 6% 2 5% 4 3 4 4 5% 8% 53%	2750
August	1st to 10th	Night	11% 5% 2 6% 4 4 5% 4 5% 8% 46%	2566
	11th to 20th	Night	13% 5% 2 5% 4 4 4 4 5% 7% 49%	2855
	21st to end	Night	14% 7% 2 6% 4 4 4 4 5% 6% 45%	3476
September	1st to 10th	Night	9% 6% 2 5% 3 4 4 3 5% 7% 52%	1900
	11th to 20th	Night	11% 6% 2 4 3 3 4 4 4 7% 52%	1900
	21st to end	Night	11% 8% 3 6% 5% 3 3 4 5% 7% 47%	2120
October	1st to 10th	Night	14% 5% 2 6% 4 4 3 4 5% 6% 47%	2280
	11th to 20th	Night	15% 11% 3 7% 4 4 5% 3 5% 6% 37%	2280
	21st to end	Night	18% 11% 3 7% 5% 4 4 4 6% 6% 31%	2674
November	1st to 10th	Night	15% 10% 3 7% 4 4 4 3 5% 7% 39%	2431
	11th to 20th	Night	14% 12% 4 9% 5% 5% 4 4 5% 6% 31%	2617
	21st to end	Night	13% 12% 4 9% 6% 4 4 4 5% 7% 32%	2660
December	1st to 10th	Night	10% 13% 5% 12% 7% 6% 4 4 6% 7% 27%	2660
	11th to 20th	Night	12% 15% 6% 14% 8% 5% 4 4 5% 6% 23%	3279
	21st to end	Night	24% 17% 6% 11% 5% 4 3 3 4 5% 19%	4884

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	65% 5% 9% 16% 4	2528
	11th to 20th	Day	67% 6% 8% 12% 6%	2530
	21st to end	Day	67% 6% 11% 12% 4	2886
February	1st to 10th	Day	51% 6% 12% 20% 10% 1	1710
	11th to 20th	Day	49% 7% 12% 23% 8% 1	1702
	21st to end	Day	56% 5% 11% 17% 9% 2	1570
March	1st to 10th	Day	40% 5% 14% 21% 18% 2	3120
	11th to 20th	Day	44% 7% 12% 23% 14% 1	3443
	21st to end	Day	60% 5% 8% 20% 6% 1	4055
April	1st to 10th	Day	52% 7% 10% 19% 12%	2280
	11th to 20th	Day	55% 6% 9% 18% 10% 2	2254
	21st to end	Day	55% 6% 11% 17% 11% 1	2370
May	1st to 10th	Day	42% 7% 11% 27% 12% 1	4440
	11th to 20th	Day	39% 7% 14% 28% 12% 1	4403
	21st to end	Day	47% 7% 11% 21% 13% 1	4837
June	1st to 10th	Day	38% 8% 14% 27% 12% 1	2660
	11th to 20th	Day	44% 8% 12% 22% 13% 1	2660
	21st to end	Day	39% 8% 17% 25% 10% 1	2660
July	1st to 10th	Day	40% 7% 18% 27% 9% 1	4371
	11th to 20th	Day	26% 7% 16% 35% 15% 2	4365
	21st to end	Day	35% 7% 14% 27% 17% 1	4662
August	1st to 10th	Day	40% 6% 14% 26% 13% 1	4356
	11th to 20th	Day	36% 6% 13% 33% 12%	4020
	21st to end	Day	42% 6% 14% 26% 11% 1	4179
September	1st to 10th	Day	39% 5% 15% 26% 14%	2280
	11th to 20th	Day	35% 8% 18% 29% 8% 1	2265
	21st to end	Day	43% 6% 12% 29% 10%	2052
October	1st to 10th	Day	41% 6% 12% 29% 10%	1900
	11th to 20th	Day	51% 6% 12% 20% 9% 1	1900
	21st to end	Day	52% 5% 14% 21% 8%	1924
November	1st to 10th	Day	46% 6% 12% 22% 12% 2	1681
	11th to 20th	Day	58% 6% 12% 17% 6% 1	1559
	21st to end	Day	51% 6% 15% 20% 6% 1	1520
December	1st to 10th	Day	62% 5% 11% 17% 5%	1520
	11th to 20th	Day	62% 6% 12% 14% 5% 1	1915
	21st to end	Day	72% 6% 6% 12% 5%	2783
January	1st to 10th	Night	59% 5% 10% 19% 6% 1	4428
	11th to 20th	Night	63% 7% 10% 14% 6%	4440
	21st to end	Night	65% 6% 8% 16% 5% 1	4779
February	1st to 10th	Night	51% 6% 10% 21% 11% 2	2470
	11th to 20th	Night	45% 7% 14% 24% 10% 2	2373
	21st to end	Night	53% 5% 13% 19% 9% 2	1884
March	1st to 10th	Night	37% 5% 14% 27% 13% 3	3733
	11th to 20th	Night	42% 7% 11% 24% 14% 1	3544
	21st to end	Night	61% 4 7% 19% 9% 1	3575
April	1st to 10th	Night	50% 6% 8% 18% 17% 1	1900
	11th to 20th	Night	47% 6% 11% 21% 14% 3	1875
	21st to end	Night	47% 7% 9% 22% 13% 2	1805
May	1st to 10th	Night	45% 9% 14% 14% 17% 1	2530
	11th to 20th	Night	35% 6% 11% 31% 15% 3	2507
	21st to end	Night	41% 8% 14% 20% 16% 1	2751
June	1st to 10th	Night	35% 8% 14% 27% 14% 1	1520
	11th to 20th	Night	38% 8% 14% 23% 15% 2	1520
	21st to end	Night	33% 9% 15% 29% 12% 2	1520
July	1st to 10th	Night	37% 6% 19% 23% 14% 2	2490
	11th to 20th	Night	23% 7% 14% 36% 18% 2	2482
	21st to end	Night	29% 7% 12% 32% 18% 2	2662
August	1st to 10th	Night	36% 6% 16% 27% 14% 2	2557
	11th to 20th	Night	34% 7% 15% 30% 14% 1	2882
	21st to end	Night	39% 5% 16% 24% 15% 2	3476
September	1st to 10th	Night	31% 7% 13% 32% 16% 1	1900
	11th to 20th	Night	32% 7% 14% 34% 14%	1900
	21st to end	Night	36% 7% 12% 31% 13% 1	2120
October	1st to 10th	Night	37% 6% 12% 30% 14% 1	2280
	11th to 20th	Night	45% 8% 12% 24% 11% 1	2280
	21st to end	Night	52% 5% 11% 20% 11%	2674
November	1st to 10th	Night	45% 4 13% 23% 14% 1	2431
	11th to 20th	Night	52% 6% 14% 16% 11% 1	2617
	21st to end	Night	51% 6% 15% 22% 6% 1	2660
December	1st to 10th	Night	56% 6% 13% 20% 5%	2660
	11th to 20th	Night	62% 5% 11% 16% 5% 1	3281
	21st to end	Night	68% 5% 7% 15% 4	4884

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	16% 12% 33% 24% 12% 3	270
	11th to 20th	Day	22% 10% 36% 25% 7% 1	270
	21st to end	Day	19% 9% 35% 29% 7% 2	297
February	1st to 10th	Day	11% 13% 47% 18% 7% 3	270
	11th to 20th	Day	15% 16% 42% 18% 9%	270
	21st to end	Day	16% 13% 44% 24% 4	225
March	1st to 10th	Day	16% 14% 38% 19% 11% 1	270
	11th to 20th	Day	17% 13% 38% 21% 10% 2	270
	21st to end	Day	21% 13% 31% 23% 9% 3	435
April	1st to 10th	Day	22% 14% 33% 23% 7% 1	460
	11th to 20th	Day	27% 13% 28% 21% 9% 2	452
	21st to end	Day	22% 14% 29% 23% 10% 2	488
May	1st to 10th	Day	19% 13% 32% 27% 7% 2	653
	11th to 20th	Day	20% 11% 28% 24% 14% 3	675
	21st to end	Day	18% 10% 25% 27% 13% 7%	734
June	1st to 10th	Day	13% 7% 31% 30% 15% 5%	680
	11th to 20th	Day	14% 9% 33% 27% 13% 4	680
	21st to end	Day	12% 8% 29% 29% 15% 6%	680
July	1st to 10th	Day	10% 4 19% 30% 26% 11%	671
	11th to 20th	Day	9% 5% 28% 31% 18% 9%	668
	21st to end	Day	6% 3 24% 34% 24% 8%	739
August	1st to 10th	Day	11% 5% 24% 30% 23% 8%	676
	11th to 20th	Day	16% 4 17% 27% 27% 9%	631
	21st to end	Day	14% 5% 25% 28% 21% 6%	539
September	1st to 10th	Day	18% 6% 23% 26% 21% 6%	490
	11th to 20th	Day	11% 5% 26% 34% 20% 4	490
	21st to end	Day	17% 9% 27% 28% 14% 5%	452
October	1st to 10th	Day	15% 12% 26% 28% 13% 6%	300
	11th to 20th	Day	22% 17% 31% 22% 7% 1	300
	21st to end	Day	24% 13% 39% 18% 4 1	330
November	1st to 10th	Day	19% 12% 30% 28% 9% 2	273
	11th to 20th	Day	20% 15% 37% 23% 5%	270
	21st to end	Day	20% 13% 42% 19% 7%	270
December	1st to 10th	Day	14% 14% 44% 21% 7%	270
	11th to 20th	Day	21% 15% 39% 19% 6%	270
	21st to end	Day	28% 15% 37% 18% 3	297
January	1st to 10th	Night	14% 11% 37% 29% 8% 1	950
	11th to 20th	Night	17% 10% 38% 28% 5% 1	950
	21st to end	Night	18% 8% 37% 30% 7% 1	1045
February	1st to 10th	Night	13% 11% 38% 31% 7% 1	950
	11th to 20th	Night	13% 11% 41% 27% 8%	898
	21st to end	Night	19% 12% 38% 27% 4	628
March	1st to 10th	Night	17% 10% 35% 30% 6% 1	760
	11th to 20th	Night	16% 12% 35% 28% 8% 1	608
	21st to end	Night	23% 9% 30% 26% 9% 2	627
April	1st to 10th	Night	22% 11% 36% 24% 6% 1	570
	11th to 20th	Night	25% 9% 31% 28% 7%	563
	21st to end	Night	22% 8% 32% 30% 8% 1	570
May	1st to 10th	Night	24% 8% 34% 28% 5% 1	570
	11th to 20th	Night	19% 7% 33% 31% 9% 1	561
	21st to end	Night	16% 5% 25% 37% 16% 1	617
June	1st to 10th	Night	14% 8% 28% 36% 14% 1	570
	11th to 20th	Night	14% 6% 29% 40% 9% 1	570
	21st to end	Night	11% 4 24% 43% 16% 1	570
July	1st to 10th	Night	7% 3 21% 39% 28% 2	555
	11th to 20th	Night	10% 4 22% 36% 26% 2	552
	21st to end	Night	6% 2 20% 43% 27% 3	624
August	1st to 10th	Night	9% 2 16% 46% 25% 2	567
	11th to 20th	Night	15% 3 18% 33% 29% 3	564
	21st to end	Night	15% 4 20% 37% 22% 2	627
September	1st to 10th	Night	10% 4 26% 38% 19% 4	570
	11th to 20th	Night	14% 4 27% 34% 19% 2	570
	21st to end	Night	13% 8% 30% 35% 13% 1	755
October	1st to 10th	Night	16% 7% 29% 31% 16% 1	760
	11th to 20th	Night	19% 11% 34% 28% 7% 1	760
	21st to end	Night	23% 9% 33% 27% 8%	836
November	1st to 10th	Night	20% 9% 33% 30% 8% 1	748
	11th to 20th	Night	19% 11% 40% 22% 7%	907
	21st to end	Night	19% 14% 37% 24% 6%	950
December	1st to 10th	Night	17% 10% 41% 24% 7% 1	950
	11th to 20th	Night	20% 10% 37% 24% 8% 1	950
	21st to end	Night	26% 12% 33% 24% 5%	1045

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