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 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% 10% 4 8% 5% 5% 4 4 6% 7% 34%	101138
	Night	15% 11% 4 8% 5% 4 4 4 5% 7% 34%	97869
Transparency	Day	47% 7% 13% 20% 12% 1	100932
	Night	49% 7% 12% 19% 12% 1	97747
Seeing	Day	17% 11% 28% 24% 14% 6%	15713
	Night	19% 9% 29% 29% 12% 1	25538

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% 20% 8% 13% 5% 4 4 3 4 5% 18%	2527
	11th to 20th	Day	15% 18% 8% 13% 7% 6% 6% 6% 7% 4 10%	2530
	21st to end	Day	27% 22% 9% 13% 4 3 3 2 3 4 11%	2827
February	1st to 10th	Day	16% 15% 6% 11% 8% 6% 4 4 6% 5% 21%	1805
	11th to 20th	Day	15% 13% 5% 13% 8% 5% 6% 3 5% 5% 23%	1848
	21st to end	Day	16% 17% 6% 11% 5% 4 4 3 5% 5% 24%	1570
March	1st to 10th	Day	18% 14% 6% 8% 5% 4 4 3 4 6% 27%	3120
	11th to 20th	Day	12% 10% 5% 9% 5% 5% 4 4 7% 9% 30%	3402
	21st to end	Day	18% 13% 6% 11% 6% 5% 5% 3 5% 5% 23%	3933
April	1st to 10th	Day	18% 13% 4 8% 5% 4 5% 3 5% 6% 30%	2280
	11th to 20th	Day	17% 10% 3 7% 5% 4 4 4 5% 6% 36%	2291
	21st to end	Day	19% 8% 3 7% 5% 4 4 3 5% 7% 35%	2470
May	1st to 10th	Day	19% 8% 2 7% 5% 4 4 4 5% 8% 33%	4082
	11th to 20th	Day	14% 8% 2 6% 4 5% 4 3 6% 8% 38%	4081
	21st to end	Day	10% 6% 2 6% 4 5% 4 4 6% 8% 44%	4691
June	1st to 10th	Day	10% 7% 2 6% 4 5% 5% 4 6% 8% 42%	2660
	11th to 20th	Day	10% 5% 1 5% 5% 5% 5% 4 6% 9% 44%	2660
	21st to end	Day	12% 6% 2 6% 5% 5% 5% 5% 6% 9% 40%	2660
July	1st to 10th	Day	12% 6% 3 7% 5% 5% 5% 3 7% 9% 37%	4440
	11th to 20th	Day	8% 4 2 5% 3 4 4 4 7% 11% 47%	4440
	21st to end	Day	6% 6% 2 7% 5% 6% 5% 5% 6% 9% 42%	4755
August	1st to 10th	Day	9% 5% 2 6% 4 4 5% 4 6% 9% 46%	4104
	11th to 20th	Day	10% 6% 2 5% 4 4 5% 4 6% 8% 45%	4044
	21st to end	Day	7% 5% 2 6% 4 5% 5% 5% 5% 9% 47%	4183
September	1st to 10th	Day	11% 6% 3 5% 5% 5% 4 3 6% 8% 45%	2237
	11th to 20th	Day	11% 4 1 5% 4 3 5% 4 6% 8% 48%	2090
	21st to end	Day	14% 6% 2 6% 4 4 4 3 6% 8% 42%	2090
October	1st to 10th	Day	13% 8% 2 6% 4 4 4 3 5% 8% 43%	2090
	11th to 20th	Day	18% 9% 3 6% 5% 4 5% 4 6% 6% 34%	1891
	21st to end	Day	20% 11% 3 7% 6% 6% 4 3 6% 7% 27%	1881
November	1st to 10th	Day	12% 10% 3 7% 5% 3 4 5% 4 7% 41%	1681
	11th to 20th	Day	16% 17% 5% 8% 5% 4 4 2 5% 6% 28%	1710
	21st to end	Day	21% 15% 5% 10% 5% 4 4 3 5% 5% 25%	1710
December	1st to 10th	Day	14% 19% 8% 11% 6% 5% 4 3 4 5% 22%	1654
	11th to 20th	Day	13% 20% 7% 14% 6% 4 4 4 5% 5% 20%	1918
	21st to end	Day	22% 22% 8% 14% 6% 3 4 2 3 4 10%	2783
January	1st to 10th	Night	17% 16% 9% 13% 5% 5% 4 3 4 5% 19%	4428
	11th to 20th	Night	16% 19% 8% 15% 6% 4 4 6% 5% 5% 12%	4440
	21st to end	Night	26% 19% 9% 11% 6% 4 3 3 4 4 13%	4824
February	1st to 10th	Night	18% 15% 5% 10% 7% 5% 4 4 4 6% 23%	2371
	11th to 20th	Night	14% 13% 5% 10% 7% 5% 5% 3 5% 6% 26%	2218
	21st to end	Night	20% 13% 5% 10% 5% 4 4 3 4 5% 27%	1884
March	1st to 10th	Night	15% 12% 5% 8% 5% 4 4 3 4 7% 34%	3733
	11th to 20th	Night	10% 8% 3 7% 5% 4 4 4 6% 7% 41%	3558
	21st to end	Night	19% 10% 4 11% 5% 4 4 3 5% 6% 30%	3727
April	1st to 10th	Night	16% 11% 2 5% 5% 5% 4 4 5% 7% 36%	1900
	11th to 20th	Night	19% 8% 3 7% 4 4 5% 4 5% 5% 37%	1837
	21st to end	Night	18% 9% 3 7% 4 3 4 4 5% 7% 36%	1710
May	1st to 10th	Night	15% 8% 3 8% 4 5% 5% 5% 6% 8% 33%	2813
	11th to 20th	Night	18% 9% 2 5% 3 3 3 3 4 8% 40%	2812
	21st to end	Night	12% 6% 3 6% 4 4 4 4 5% 7% 44%	2868
June	1st to 10th	Night	9% 5% 2 6% 3 3 4 3 6% 10% 48%	1520
	11th to 20th	Night	9% 6% 2 6% 5% 4 5% 4 6% 8% 44%	1520
	21st to end	Night	9% 6% 2 5% 5% 4 5% 5% 7% 9% 43%	1520
July	1st to 10th	Night	9% 4 2 5% 5% 4 4 4 6% 11% 45%	2530
	11th to 20th	Night	6% 4 2 5% 3 3 4 4 6% 8% 56%	2530
	21st to end	Night	7% 6% 2 6% 5% 4 5% 5% 8% 9% 45%	2805
August	1st to 10th	Night	11% 6% 2 6% 4 3 4 5% 6% 9% 43%	2825
	11th to 20th	Night	9% 5% 2 6% 4 4 5% 4 5% 8% 48%	2785
	21st to end	Night	10% 6% 3 6% 3 4 4 3 5% 8% 49%	3469
September	1st to 10th	Night	10% 5% 2 5% 4 3 4 3 5% 5% 52%	1924
	11th to 20th	Night	9% 5% 2 4 3 3 3 3 5% 7% 56%	2090
	21st to end	Night	15% 7% 2 6% 4 4 3 3 4 6% 45%	2090
October	1st to 10th	Night	13% 7% 2 5% 4 3 4 3 5% 6% 48%	2090
	11th to 20th	Night	18% 10% 3 8% 5% 3 3 3 4 6% 38%	2286
	21st to end	Night	22% 9% 3 7% 5% 4 4 3 5% 5% 35%	2717
November	1st to 10th	Night	12% 11% 4 6% 4 4 4 4 5% 7% 40%	2420
	11th to 20th	Night	16% 14% 4 8% 5% 4 3 4 6% 7% 29%	2470
	21st to end	Night	19% 16% 4 9% 5% 4 3 3 5% 6% 26%	2470
December	1st to 10th	Night	18% 17% 6% 11% 6% 5% 4 4 4 5% 20%	2522
	11th to 20th	Night	16% 17% 8% 11% 7% 5% 4 3 4 5% 21%	3279
	21st to end	Night	26% 19% 7% 10% 5% 4 4 4 5% 5% 12%	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	67% 7% 12% 11% 3	2528
	11th to 20th	Day	70% 8% 11% 8% 3	2530
	21st to end	Day	80% 3 6% 9% 2	2827
February	1st to 10th	Day	63% 6% 11% 12% 6% 1	1805
	11th to 20th	Day	62% 6% 10% 14% 8%	1858
	21st to end	Day	61% 6% 11% 14% 5% 2	1570
March	1st to 10th	Day	57% 7% 10% 18% 7%	3120
	11th to 20th	Day	46% 9% 15% 23% 7% 1	3402
	21st to end	Day	61% 8% 12% 15% 4	3933
April	1st to 10th	Day	53% 6% 11% 19% 11%	2280
	11th to 20th	Day	48% 7% 10% 21% 11% 2	2291
	21st to end	Day	48% 6% 13% 17% 13% 2	2470
May	1st to 10th	Day	45% 10% 14% 21% 10%	4120
	11th to 20th	Day	41% 9% 16% 24% 9% 1	4085
	21st to end	Day	33% 10% 12% 21% 22% 1	4704
June	1st to 10th	Day	37% 7% 13% 25% 17% 1	2660
	11th to 20th	Day	34% 9% 13% 23% 19% 2	2660
	21st to end	Day	39% 9% 15% 19% 15% 2	2660
July	1st to 10th	Day	43% 6% 14% 19% 16% 3	4371
	11th to 20th	Day	29% 7% 16% 31% 16% 1	4365
	21st to end	Day	36% 10% 15% 17% 20% 3	4605
August	1st to 10th	Day	34% 7% 16% 26% 16% 1	4091
	11th to 20th	Day	34% 8% 13% 28% 16% 1	4083
	21st to end	Day	32% 7% 13% 28% 17% 3	4182
September	1st to 10th	Day	36% 8% 16% 20% 18% 3	2237
	11th to 20th	Day	32% 7% 12% 27% 21% 2	2090
	21st to end	Day	39% 5% 14% 23% 17% 1	2090
October	1st to 10th	Day	40% 6% 12% 26% 15% 2	2090
	11th to 20th	Day	48% 5% 12% 20% 15%	1891
	21st to end	Day	55% 6% 13% 16% 9% 1	1881
November	1st to 10th	Day	42% 7% 12% 24% 14% 1	1681
	11th to 20th	Day	57% 5% 11% 18% 8% 1	1710
	21st to end	Day	62% 5% 12% 15% 6%	1710
December	1st to 10th	Day	65% 6% 10% 14% 5%	1654
	11th to 20th	Day	63% 9% 13% 13% 2	1915
	21st to end	Day	79% 5% 7% 5% 3	2783
January	1st to 10th	Night	65% 7% 11% 12% 4	4428
	11th to 20th	Night	73% 6% 10% 8% 3	4440
	21st to end	Night	75% 5% 10% 8% 3	4824
February	1st to 10th	Night	62% 6% 12% 13% 6% 1	2371
	11th to 20th	Night	57% 6% 10% 18% 8% 1	2219
	21st to end	Night	59% 5% 12% 15% 7% 2	1884
March	1st to 10th	Night	50% 5% 12% 24% 8% 1	3733
	11th to 20th	Night	38% 9% 14% 24% 13% 2	3558
	21st to end	Night	52% 7% 14% 19% 7% 1	3727
April	1st to 10th	Night	45% 7% 13% 21% 13% 1	1900
	11th to 20th	Night	47% 7% 9% 17% 17% 2	1837
	21st to end	Night	47% 7% 11% 20% 13% 2	1710
May	1st to 10th	Night	45% 9% 12% 21% 11% 1	2840
	11th to 20th	Night	42% 7% 12% 27% 11% 1	2813
	21st to end	Night	35% 9% 15% 18% 21% 2	2876
June	1st to 10th	Night	31% 7% 13% 28% 18% 3	1520
	11th to 20th	Night	35% 8% 13% 23% 19% 2	1520
	21st to end	Night	35% 10% 16% 21% 16% 3	1520
July	1st to 10th	Night	33% 8% 14% 25% 15% 6%	2490
	11th to 20th	Night	25% 6% 16% 27% 23% 3	2482
	21st to end	Night	32% 8% 15% 17% 24% 3	2716
August	1st to 10th	Night	35% 8% 14% 28% 14% 1	2814
	11th to 20th	Night	32% 7% 13% 29% 17% 1	2812
	21st to end	Night	33% 7% 10% 29% 19% 3	3469
September	1st to 10th	Night	32% 7% 12% 23% 21% 5%	1924
	11th to 20th	Night	28% 5% 10% 31% 24% 2	2090
	21st to end	Night	39% 6% 10% 27% 17% 1	2090
October	1st to 10th	Night	36% 5% 10% 28% 19% 1	2090
	11th to 20th	Night	47% 6% 11% 22% 14% 1	2286
	21st to end	Night	50% 5% 11% 21% 11% 1	2717
November	1st to 10th	Night	44% 6% 11% 22% 16% 1	2420
	11th to 20th	Night	52% 7% 14% 18% 8% 1	2470
	21st to end	Night	59% 6% 11% 18% 6%	2470
December	1st to 10th	Night	66% 6% 11% 12% 5%	2522
	11th to 20th	Night	65% 7% 10% 13% 4	3281
	21st to end	Night	73% 7% 11% 7% 2	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	19% 24% 33% 16% 8% 1	270
	11th to 20th	Day	25% 14% 43% 13% 5% 1	270
	21st to end	Day	31% 15% 30% 21% 4	297
February	1st to 10th	Day	25% 17% 34% 18% 5% 1	270
	11th to 20th	Day	24% 20% 32% 20% 4	270
	21st to end	Day	22% 26% 38% 11% 3	225
March	1st to 10th	Day	20% 22% 38% 14% 5%	270
	11th to 20th	Day	25% 13% 32% 22% 7% 1	408
	21st to end	Day	33% 13% 27% 20% 6% 1	506
April	1st to 10th	Day	25% 14% 31% 23% 6% 1	460
	11th to 20th	Day	22% 19% 30% 17% 10% 3	452
	21st to end	Day	24% 15% 31% 19% 9% 2	460
May	1st to 10th	Day	22% 15% 32% 19% 9% 3	463
	11th to 20th	Day	23% 11% 26% 23% 12% 5%	487
	21st to end	Day	14% 7% 26% 26% 20% 7%	653
June	1st to 10th	Day	10% 10% 28% 31% 16% 5%	680
	11th to 20th	Day	14% 6% 27% 30% 18% 5%	680
	21st to end	Day	13% 7% 30% 28% 17% 6%	680
July	1st to 10th	Day	10% 4 20% 30% 23% 13%	671
	11th to 20th	Day	11% 4 23% 30% 21% 11%	668
	21st to end	Day	7% 3 23% 32% 23% 11%	705
August	1st to 10th	Day	9% 2 18% 29% 25% 17%	486
	11th to 20th	Day	11% 3 20% 30% 27% 9%	479
	21st to end	Day	11% 3 17% 28% 28% 12%	539
September	1st to 10th	Day	12% 7% 22% 26% 23% 10%	490
	11th to 20th	Day	8% 4 18% 24% 32% 14%	490
	21st to end	Day	17% 12% 19% 25% 20% 7%	490
October	1st to 10th	Day	15% 6% 29% 27% 16% 6%	490
	11th to 20th	Day	20% 17% 26% 28% 8% 1	424
	21st to end	Day	27% 14% 38% 15% 5% 1	330
November	1st to 10th	Day	14% 15% 34% 26% 8% 3	273
	11th to 20th	Day	24% 18% 31% 20% 7%	270
	21st to end	Day	30% 12% 37% 17% 3	270
December	1st to 10th	Day	22% 22% 34% 14% 7% 1	270
	11th to 20th	Day	22% 19% 37% 17% 4	270
	21st to end	Day	23% 23% 40% 13% 1	297
January	1st to 10th	Night	22% 15% 36% 22% 5%	950
	11th to 20th	Night	25% 14% 36% 19% 5% 1	950
	21st to end	Night	23% 13% 36% 25% 3	1011
February	1st to 10th	Night	26% 10% 37% 23% 4	760
	11th to 20th	Night	20% 14% 37% 26% 3	743
	21st to end	Night	26% 11% 40% 20% 3	628
March	1st to 10th	Night	21% 13% 35% 24% 7% 1	760
	11th to 20th	Night	18% 10% 40% 25% 7%	760
	21st to end	Night	26% 10% 30% 29% 5% 1	784
April	1st to 10th	Night	19% 12% 35% 26% 6% 1	570
	11th to 20th	Night	23% 10% 34% 26% 6% 1	563
	21st to end	Night	20% 10% 34% 26% 9% 1	570
May	1st to 10th	Night	20% 6% 31% 34% 7% 1	570
	11th to 20th	Night	22% 6% 27% 30% 14%	561
	21st to end	Night	12% 5% 25% 38% 19% 1	617
June	1st to 10th	Night	10% 4 26% 45% 15%	570
	11th to 20th	Night	10% 3 27% 40% 18% 1	570
	21st to end	Night	11% 3 23% 38% 23% 2	570
July	1st to 10th	Night	7% 3 17% 41% 28% 4	555
	11th to 20th	Night	8% 2 18% 40% 28% 3	552
	21st to end	Night	7% 2 15% 43% 32% 2	624
August	1st to 10th	Night	8% 3 12% 45% 28% 5%	567
	11th to 20th	Night	9% 2 14% 43% 29% 4	564
	21st to end	Night	11% 2 16% 33% 34% 4	627
September	1st to 10th	Night	13% 2 18% 37% 27% 3	594
	11th to 20th	Night	9% 4 16% 38% 28% 4	760
	21st to end	Night	17% 6% 24% 30% 19% 4	760
October	1st to 10th	Night	14% 7% 26% 33% 18% 2	760
	11th to 20th	Night	21% 15% 29% 26% 9% 1	760
	21st to end	Night	25% 13% 32% 24% 7%	836
November	1st to 10th	Night	19% 12% 31% 28% 10% 1	745
	11th to 20th	Night	23% 15% 33% 22% 6% 1	760
	21st to end	Night	26% 13% 32% 25% 4	760
December	1st to 10th	Night	26% 16% 34% 19% 5%	812
	11th to 20th	Night	24% 13% 37% 21% 4	950
	21st to end	Night	31% 14% 35% 18% 2	1045

Page generated at 2024-10-30 01:22:57. Version ac07

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