Shipshewana
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Shipshewana clear sky chart from 2005-11-06 to 2026-09-29.

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	13% 10% 4 9% 5% 5% 5% 4 5% 7% 34%	148821
	Night	14% 11% 4 9% 5% 4 4 4 5% 6% 33%	142861
Transparency	Day	47% 7% 12% 21% 13% 1	152389
	Night	49% 6% 11% 20% 12% 1	147370
Seeing	Day	18% 12% 28% 23% 14% 5%	18349
	Night	19% 10% 30% 29% 12% 1	28098

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	13% 19% 9% 23% 5% 4 4 3 4 4 13%	4691
	11th to 20th	Day	11% 15% 9% 14% 9% 9% 6% 4 5% 4 14%	4710
	21st to end	Day	18% 17% 7% 14% 7% 6% 5% 3 3 4 15%	5252
February	1st to 10th	Day	15% 15% 6% 11% 8% 6% 4 4 5% 6% 21%	1995
	11th to 20th	Day	15% 13% 6% 14% 8% 5% 5% 3 5% 5% 22%	2048
	21st to end	Day	15% 16% 7% 11% 5% 5% 4 3 5% 5% 24%	1730
March	1st to 10th	Day	17% 12% 6% 12% 5% 4 4 3 4 5% 29%	4580
	11th to 20th	Day	11% 10% 5% 8% 4 4 4 4 6% 8% 35%	4967
	21st to end	Day	17% 15% 7% 11% 6% 5% 5% 3 5% 5% 21%	5762
April	1st to 10th	Day	19% 13% 4 8% 5% 4 5% 3 5% 6% 29%	2520
	11th to 20th	Day	16% 10% 3 7% 5% 4 4 4 5% 6% 36%	2535
	21st to end	Day	18% 8% 3 7% 5% 4 4 3 5% 7% 36%	2730
May	1st to 10th	Day	18% 9% 3 7% 4 4 5% 4 5% 7% 34%	7616
	11th to 20th	Day	13% 7% 3 6% 5% 5% 5% 4 6% 8% 38%	7626
	21st to end	Day	14% 6% 2 6% 4 4 4 4 6% 8% 41%	8802
June	1st to 10th	Day	10% 6% 2 6% 4 5% 5% 4 6% 8% 42%	2940
	11th to 20th	Day	10% 5% 2 5% 5% 5% 5% 4 6% 9% 43%	2940
	21st to end	Day	11% 6% 2 6% 5% 5% 5% 5% 7% 9% 41%	2940
July	1st to 10th	Day	10% 5% 2 7% 5% 5% 5% 4 7% 10% 40%	8280
	11th to 20th	Day	7% 5% 2 6% 4 5% 5% 4 7% 10% 46%	8280
	21st to end	Day	9% 6% 2 6% 4 5% 5% 5% 6% 9% 43%	8876
August	1st to 10th	Day	13% 6% 3 6% 4 4 5% 4 6% 8% 42%	6014
	11th to 20th	Day	14% 8% 3 7% 5% 5% 5% 4 6% 8% 37%	5951
	21st to end	Day	6% 4 2 6% 4 5% 5% 5% 6% 9% 47%	6083
September	1st to 10th	Day	10% 6% 3 5% 5% 4 4 3 5% 8% 46%	2473
	11th to 20th	Day	11% 4 1 5% 4 4 5% 4 6% 8% 48%	2310
	21st to end	Day	14% 6% 2 7% 4 4 4 4 5% 8% 42%	2288
October	1st to 10th	Day	13% 7% 2 6% 4 4 4 3 5% 8% 44%	2200
	11th to 20th	Day	17% 8% 3 6% 5% 4 5% 4 6% 6% 35%	1990
	21st to end	Day	19% 11% 3 7% 6% 6% 4 3 6% 7% 28%	1980
November	1st to 10th	Day	12% 10% 3 7% 5% 3 4 5% 4 7% 40%	1852
	11th to 20th	Day	16% 17% 5% 8% 5% 4 3 2 4 6% 28%	1890
	21st to end	Day	21% 16% 5% 10% 5% 4 4 3 4 5% 24%	1890
December	1st to 10th	Day	10% 17% 7% 15% 6% 4 4 3 4 5% 25%	2922
	11th to 20th	Day	16% 19% 9% 14% 6% 5% 4 3 4 4 16%	3088
	21st to end	Day	26% 20% 8% 14% 6% 3 4 2 3 4 10%	4070
January	1st to 10th	Night	13% 18% 8% 19% 6% 5% 4 2 4 4 17%	8232
	11th to 20th	Night	11% 17% 8% 17% 8% 7% 5% 5% 5% 5% 13%	8280
	21st to end	Night	16% 14% 6% 12% 8% 6% 5% 4 5% 5% 19%	8942
February	1st to 10th	Night	17% 15% 5% 10% 7% 5% 4 4 4 6% 24%	2620
	11th to 20th	Night	15% 13% 5% 11% 7% 5% 5% 3 5% 6% 26%	2458
	21st to end	Night	18% 13% 5% 10% 5% 4 4 3 4 5% 28%	2076
March	1st to 10th	Night	15% 12% 5% 9% 5% 4 4 3 4 7% 34%	5493
	11th to 20th	Night	12% 8% 3 7% 5% 4 4 4 5% 7% 41%	5213
	21st to end	Night	17% 11% 4 10% 5% 4 4 3 5% 6% 32%	5453
April	1st to 10th	Night	17% 12% 2 5% 4 5% 4 4 5% 7% 35%	2100
	11th to 20th	Night	18% 8% 3 7% 5% 4 5% 4 5% 5% 37%	2033
	21st to end	Night	17% 9% 2 7% 4 3 4 4 5% 7% 37%	1890
May	1st to 10th	Night	18% 9% 3 7% 4 4 4 4 5% 6% 35%	5237
	11th to 20th	Night	14% 7% 2 6% 4 4 4 3 5% 8% 43%	5234
	21st to end	Night	14% 7% 2 6% 4 4 4 4 5% 7% 43%	5368
June	1st to 10th	Night	9% 5% 2 6% 3 3 4 3 6% 10% 47%	1680
	11th to 20th	Night	10% 5% 3 6% 5% 4 5% 4 6% 9% 44%	1680
	21st to end	Night	9% 5% 2 5% 5% 4 5% 5% 8% 9% 43%	1680
July	1st to 10th	Night	9% 5% 2 5% 4 4 4 4 6% 10% 47%	4708
	11th to 20th	Night	5% 5% 2 6% 3 4 5% 4 6% 9% 51%	4707
	21st to end	Night	9% 6% 2 6% 4 4 4 4 7% 9% 46%	5224
August	1st to 10th	Night	15% 6% 2 6% 4 3 4 4 6% 8% 43%	4135
	11th to 20th	Night	13% 8% 3 8% 5% 4 5% 4 5% 8% 39%	4095
	21st to end	Night	8% 5% 2 5% 4 4 4 3 5% 8% 51%	5039
September	1st to 10th	Night	10% 5% 2 6% 5% 4 4 3 5% 5% 52%	2126
	11th to 20th	Night	9% 5% 2 4 3 3 3 3 5% 7% 55%	2310
	21st to end	Night	15% 7% 2 6% 4 4 4 3 4 6% 45%	2289
October	1st to 10th	Night	12% 7% 2 5% 4 4 4 3 5% 6% 49%	2200
	11th to 20th	Night	17% 9% 3 8% 5% 4 3 3 4 6% 38%	2407
	21st to end	Night	21% 9% 3 6% 5% 3 4 3 5% 6% 36%	2860
November	1st to 10th	Night	12% 11% 4 7% 4 4 4 4 5% 7% 40%	2666
	11th to 20th	Night	15% 14% 4 8% 5% 4 4 4 6% 7% 29%	2730
	21st to end	Night	18% 18% 5% 8% 5% 4 3 3 5% 6% 25%	2730
December	1st to 10th	Night	13% 14% 6% 15% 7% 5% 5% 4 5% 6% 21%	4477
	11th to 20th	Night	16% 19% 9% 13% 8% 5% 4 3 4 4 16%	5339
	21st to end	Night	26% 20% 7% 11% 5% 4 4 3 4 5% 11%	7150

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	75% 6% 10% 8% 2	4692
	11th to 20th	Day	70% 6% 8% 8% 7%	4710
	21st to end	Day	73% 4 8% 10% 5%	5252
February	1st to 10th	Day	63% 6% 11% 12% 6% 1	1995
	11th to 20th	Day	63% 6% 10% 14% 7%	2058
	21st to end	Day	61% 6% 11% 14% 6% 1	1730
March	1st to 10th	Day	57% 6% 10% 19% 8%	4580
	11th to 20th	Day	44% 7% 16% 26% 7% 1	4967
	21st to end	Day	64% 7% 10% 14% 6%	5764
April	1st to 10th	Day	54% 6% 11% 18% 11%	2520
	11th to 20th	Day	48% 7% 11% 21% 11% 2	2535
	21st to end	Day	47% 6% 14% 19% 12% 2	2730
May	1st to 10th	Day	47% 8% 11% 20% 13%	7651
	11th to 20th	Day	42% 7% 15% 21% 13% 1	7630
	21st to end	Day	38% 7% 10% 21% 19% 4	8816
June	1st to 10th	Day	38% 7% 12% 24% 18% 1	2940
	11th to 20th	Day	35% 8% 13% 23% 18% 2	2940
	21st to end	Day	38% 9% 15% 20% 15% 2	2940
July	1st to 10th	Day	38% 7% 13% 24% 17% 2	8211
	11th to 20th	Day	31% 7% 14% 30% 17% 1	8205
	21st to end	Day	35% 7% 13% 24% 19% 2	8681
August	1st to 10th	Day	39% 6% 14% 21% 19% 1	6001
	11th to 20th	Day	43% 8% 13% 23% 12%	5990
	21st to end	Day	31% 7% 15% 30% 14% 2	6082
September	1st to 10th	Day	35% 7% 15% 22% 17% 3	2473
	11th to 20th	Day	33% 6% 12% 27% 21% 2	2310
	21st to end	Day	40% 6% 13% 23% 17% 2	2288
October	1st to 10th	Day	29% 4 10% 36% 19% 1	3590
	11th to 20th	Day	41% 5% 11% 21% 23%	3219
	21st to end	Day	46% 6% 12% 23% 12% 2	3180
November	1st to 10th	Day	42% 7% 11% 25% 14% 1	1852
	11th to 20th	Day	57% 5% 11% 18% 8% 1	1890
	21st to end	Day	63% 5% 11% 16% 5%	1890
December	1st to 10th	Day	61% 6% 14% 16% 3	2922
	11th to 20th	Day	70% 7% 9% 12% 2	3085
	21st to end	Day	80% 4 6% 7% 3	4070
January	1st to 10th	Night	70% 5% 9% 13% 3	8233
	11th to 20th	Night	71% 6% 9% 9% 5%	8280
	21st to end	Night	66% 5% 12% 10% 6%	8942
February	1st to 10th	Night	60% 6% 12% 14% 7% 1	2620
	11th to 20th	Night	58% 6% 10% 18% 8% 1	2459
	21st to end	Night	58% 5% 13% 15% 7% 1	2076
March	1st to 10th	Night	50% 5% 12% 25% 7% 1	5493
	11th to 20th	Night	40% 7% 13% 28% 11% 2	5213
	21st to end	Night	51% 6% 11% 19% 11% 1	5453
April	1st to 10th	Night	47% 6% 12% 21% 13% 1	2100
	11th to 20th	Night	48% 6% 10% 17% 17% 2	2033
	21st to end	Night	46% 7% 12% 22% 12% 2	1890
May	1st to 10th	Night	48% 7% 11% 19% 14% 1	5264
	11th to 20th	Night	39% 7% 12% 25% 16% 1	5235
	21st to end	Night	39% 6% 12% 17% 20% 4	5378
June	1st to 10th	Night	32% 7% 13% 27% 19% 3	1680
	11th to 20th	Night	35% 8% 14% 22% 19% 2	1680
	21st to end	Night	34% 10% 16% 22% 15% 3	1680
July	1st to 10th	Night	33% 6% 11% 29% 17% 4	4670
	11th to 20th	Night	29% 6% 14% 26% 24% 2	4662
	21st to end	Night	33% 7% 12% 24% 22% 2	5108
August	1st to 10th	Night	39% 7% 12% 24% 19% 1	4124
	11th to 20th	Night	42% 7% 13% 23% 13% 1	4122
	21st to end	Night	30% 6% 11% 33% 18% 2	5039
September	1st to 10th	Night	32% 7% 12% 25% 19% 4	2126
	11th to 20th	Night	29% 5% 9% 30% 25% 2	2310
	21st to end	Night	39% 6% 10% 26% 17% 2	2289
October	1st to 10th	Night	24% 4 9% 34% 28% 1	3590
	11th to 20th	Night	39% 4 10% 23% 23% 1	3917
	21st to end	Night	38% 4 10% 29% 18%	4610
November	1st to 10th	Night	44% 6% 11% 23% 15% 1	2666
	11th to 20th	Night	52% 7% 14% 18% 8% 2	2730
	21st to end	Night	60% 6% 11% 18% 6%	2730
December	1st to 10th	Night	61% 7% 14% 14% 4	4477
	11th to 20th	Night	71% 5% 9% 11% 3	5341
	21st to end	Night	75% 6% 9% 7% 2	7150

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	18% 23% 35% 15% 8% 1	330
	11th to 20th	Day	23% 20% 41% 11% 4 1	330
	21st to end	Day	29% 18% 31% 19% 3	363
February	1st to 10th	Day	26% 17% 35% 15% 5% 1	330
	11th to 20th	Day	25% 21% 32% 18% 3	330
	21st to end	Day	23% 24% 40% 10% 3	273
March	1st to 10th	Day	21% 22% 41% 12% 4	330
	11th to 20th	Day	27% 15% 32% 20% 6% 1	482
	21st to end	Day	30% 16% 30% 18% 5% 1	594
April	1st to 10th	Day	27% 16% 30% 21% 5% 1	540
	11th to 20th	Day	22% 20% 30% 17% 9% 3	532
	21st to end	Day	23% 14% 31% 21% 9% 2	540
May	1st to 10th	Day	23% 16% 31% 18% 8% 3	543
	11th to 20th	Day	22% 12% 28% 21% 11% 5%	567
	21st to end	Day	15% 7% 26% 26% 18% 7%	755
June	1st to 10th	Day	12% 10% 28% 30% 16% 5%	780
	11th to 20th	Day	15% 8% 28% 29% 16% 5%	780
	21st to end	Day	12% 8% 29% 30% 16% 5%	780
July	1st to 10th	Day	10% 4 20% 31% 23% 12%	771
	11th to 20th	Day	10% 5% 23% 30% 22% 10%	768
	21st to end	Day	7% 4 24% 32% 23% 10%	811
August	1st to 10th	Day	9% 3 17% 29% 25% 16%	566
	11th to 20th	Day	13% 5% 20% 29% 25% 9%	559
	21st to end	Day	10% 4 18% 28% 28% 12%	627
September	1st to 10th	Day	12% 6% 22% 26% 22% 11%	570
	11th to 20th	Day	9% 4 18% 24% 30% 15%	570
	21st to end	Day	17% 11% 19% 25% 21% 7%	562
October	1st to 10th	Day	15% 6% 28% 28% 17% 6%	530
	11th to 20th	Day	19% 16% 27% 28% 8% 1	460
	21st to end	Day	25% 14% 40% 16% 4 1	363
November	1st to 10th	Day	15% 18% 34% 24% 6% 2	330
	11th to 20th	Day	25% 20% 32% 17% 6%	330
	21st to end	Day	32% 13% 37% 15% 3	330
December	1st to 10th	Day	22% 22% 34% 16% 6% 1	330
	11th to 20th	Day	24% 20% 36% 16% 3	330
	21st to end	Day	26% 21% 40% 11% 2	363
January	1st to 10th	Night	22% 15% 36% 22% 4	1050
	11th to 20th	Night	24% 16% 37% 18% 4 1	1050
	21st to end	Night	22% 14% 37% 24% 3	1117
February	1st to 10th	Night	25% 11% 38% 23% 3	840
	11th to 20th	Night	21% 14% 37% 25% 3	823
	21st to end	Night	25% 11% 41% 20% 3	692
March	1st to 10th	Night	21% 13% 35% 23% 7% 1	840
	11th to 20th	Night	19% 11% 40% 23% 6%	840
	21st to end	Night	25% 11% 31% 28% 5%	866
April	1st to 10th	Night	21% 13% 34% 25% 6% 1	630
	11th to 20th	Night	23% 11% 34% 26% 6% 1	623
	21st to end	Night	19% 9% 34% 27% 9% 1	630
May	1st to 10th	Night	21% 6% 33% 33% 7%	630
	11th to 20th	Night	21% 7% 28% 31% 13%	621
	21st to end	Night	12% 5% 26% 39% 17% 1	683
June	1st to 10th	Night	11% 4 26% 44% 14%	630
	11th to 20th	Night	11% 4 29% 39% 17% 1	630
	21st to end	Night	11% 3 22% 40% 22% 2	630
July	1st to 10th	Night	7% 3 16% 42% 27% 4	615
	11th to 20th	Night	8% 2 18% 41% 28% 3	612
	21st to end	Night	7% 2 15% 43% 32% 2	690
August	1st to 10th	Night	8% 3 11% 45% 28% 4	627
	11th to 20th	Night	9% 2 15% 42% 28% 4	624
	21st to end	Night	10% 2 16% 34% 33% 4	693
September	1st to 10th	Night	12% 2 18% 37% 27% 3	656
	11th to 20th	Night	9% 5% 17% 38% 28% 4	840
	21st to end	Night	17% 6% 24% 30% 19% 4	833
October	1st to 10th	Night	14% 7% 26% 33% 19% 2	800
	11th to 20th	Night	20% 15% 29% 27% 9% 1	800
	21st to end	Night	24% 13% 31% 24% 7%	880
November	1st to 10th	Night	19% 12% 32% 27% 10% 1	820
	11th to 20th	Night	22% 16% 34% 22% 5% 1	840
	21st to end	Night	27% 14% 32% 24% 4	840
December	1st to 10th	Night	26% 15% 35% 19% 5%	898
	11th to 20th	Night	24% 14% 37% 21% 4	1050
	21st to end	Night	31% 14% 34% 18% 3	1155

Page generated at 2026-09-26 04:18:41. Version ac07

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