Higinbotham State Wildlife Managment Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Higinbotham State Wildlife Managment Area clear sky chart from 2005-11-06 to 2026-07-31.

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	11% 9% 3 9% 5% 5% 5% 4 6% 7% 35%	138561
	Night	9% 10% 4 10% 6% 5% 5% 4 6% 7% 33%	134788
Transparency	Day	46% 5% 13% 25% 10% 1	142011
	Night	49% 5% 13% 22% 10% 1	139424
Seeing	Day	15% 10% 31% 28% 13% 3	18609
	Night	15% 8% 34% 32% 11% 1	28475

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	5% 12% 7% 20% 8% 7% 7% 5% 5% 6% 18%	4124
	11th to 20th	Day	4 12% 5% 14% 10% 9% 11% 10% 7% 6% 12%	4249
	21st to end	Day	4 12% 8% 15% 7% 7% 7% 5% 7% 9% 19%	5315
February	1st to 10th	Day	8% 14% 6% 12% 7% 5% 7% 6% 7% 6% 23%	1890
	11th to 20th	Day	6% 12% 5% 10% 8% 7% 7% 4 9% 8% 24%	1844
	21st to end	Day	6% 11% 4 11% 9% 8% 8% 4 6% 7% 25%	1630
March	1st to 10th	Day	10% 9% 3 8% 7% 5% 5% 4 6% 8% 33%	4818
	11th to 20th	Day	8% 9% 5% 12% 8% 5% 5% 4 7% 8% 28%	5090
	21st to end	Day	14% 16% 5% 10% 5% 4 4 3 5% 6% 29%	5585
April	1st to 10th	Day	13% 12% 4 10% 6% 5% 5% 4 5% 6% 31%	2498
	11th to 20th	Day	17% 12% 4 8% 6% 5% 5% 4 5% 6% 30%	2702
	21st to end	Day	19% 9% 4 9% 5% 4 4 4 5% 6% 30%	2730
May	1st to 10th	Day	11% 7% 2 6% 4 4 4 4 5% 7% 47%	7815
	11th to 20th	Day	15% 9% 2 7% 5% 4 4 4 5% 7% 38%	8222
	21st to end	Day	13% 7% 2 6% 5% 4 4 3 5% 7% 44%	9641
June	1st to 10th	Day	15% 6% 2 6% 4 5% 5% 5% 6% 9% 38%	3150
	11th to 20th	Day	14% 6% 2 6% 5% 4 4 4 6% 9% 40%	3150
	21st to end	Day	12% 7% 3 6% 5% 5% 5% 4 6% 9% 37%	3150
July	1st to 10th	Day	6% 4 2 6% 4 5% 6% 5% 9% 11% 42%	6949
	11th to 20th	Day	10% 5% 2 6% 4 4 5% 4 7% 9% 44%	6950
	21st to end	Day	8% 5% 2 5% 4 5% 5% 5% 7% 9% 44%	7332
August	1st to 10th	Day	10% 5% 2 6% 4 4 5% 4 6% 8% 46%	4234
	11th to 20th	Day	11% 6% 2 6% 4 4 4 4 7% 8% 44%	4171
	21st to end	Day	12% 5% 2 6% 3 3 3 3 5% 8% 50%	4675
September	1st to 10th	Day	11% 6% 2 6% 3 3 3 3 5% 8% 49%	2452
	11th to 20th	Day	13% 7% 2 5% 4 4 4 3 6% 8% 42%	2204
	21st to end	Day	13% 7% 2 6% 4 3 4 4 6% 7% 44%	2200
October	1st to 10th	Day	16% 9% 3 7% 3 4 3 3 5% 6% 40%	2015
	11th to 20th	Day	16% 11% 3 7% 4 4 3 3 5% 7% 36%	2000
	21st to end	Day	15% 14% 5% 10% 4 5% 4 3 5% 7% 29%	2027
November	1st to 10th	Day	13% 16% 5% 10% 6% 4 3 4 4 5% 30%	1692
	11th to 20th	Day	12% 15% 5% 13% 6% 5% 5% 3 5% 4 27%	1680
	21st to end	Day	9% 14% 5% 14% 8% 6% 4 4 5% 5% 25%	1680
December	1st to 10th	Day	11% 14% 6% 16% 10% 11% 5% 4 5% 6% 13%	2413
	11th to 20th	Day	9% 18% 7% 11% 6% 4 5% 5% 7% 7% 21%	2709
	21st to end	Day	13% 15% 7% 18% 8% 6% 4 3 4 4 17%	3575
January	1st to 10th	Night	4 11% 6% 18% 9% 9% 7% 6% 6% 7% 17%	8800
	11th to 20th	Night	4 14% 6% 13% 9% 9% 10% 9% 7% 6% 13%	8665
	21st to end	Night	5% 12% 6% 13% 6% 6% 8% 5% 7% 8% 24%	8897
February	1st to 10th	Night	8% 12% 5% 11% 7% 6% 7% 5% 7% 6% 26%	2730
	11th to 20th	Night	7% 10% 4 9% 6% 6% 6% 5% 7% 8% 31%	2663
	21st to end	Night	7% 11% 5% 11% 8% 7% 5% 4 6% 6% 30%	2195
March	1st to 10th	Night	6% 10% 3 10% 7% 5% 4 4 5% 7% 37%	5253
	11th to 20th	Night	8% 11% 4 11% 9% 6% 5% 4 5% 6% 32%	5089
	21st to end	Night	13% 14% 6% 12% 5% 4 4 3 4 5% 29%	5588
April	1st to 10th	Night	12% 10% 3 8% 5% 5% 3 3 6% 8% 35%	2116
	11th to 20th	Night	15% 12% 4 8% 4 4 4 3 5% 6% 34%	1869
	21st to end	Night	16% 10% 3 7% 5% 4 3 3 5% 6% 37%	1890
May	1st to 10th	Night	12% 7% 2 5% 3 3 4 4 6% 7% 47%	5110
	11th to 20th	Night	15% 6% 2 5% 4 3 4 4 5% 7% 44%	4670
	21st to end	Night	12% 6% 2 5% 4 3 4 4 5% 7% 48%	4565
June	1st to 10th	Night	11% 6% 2 4 3 3 5% 5% 7% 8% 45%	1470
	11th to 20th	Night	11% 4 2 5% 5% 4 5% 3 6% 9% 44%	1470
	21st to end	Night	8% 6% 2 5% 5% 4 5% 4 7% 8% 46%	1470
July	1st to 10th	Night	8% 4 2 4 3 3 4 4 7% 11% 50%	3250
	11th to 20th	Night	5% 4 2 4 4 3 4 4 6% 9% 56%	3250
	21st to end	Night	6% 5% 2 6% 4 4 5% 4 7% 10% 46%	3761
August	1st to 10th	Night	5% 3 2 5% 3 5% 4 4 7% 8% 53%	2926
	11th to 20th	Night	11% 4 2 5% 4 3 4 4 7% 8% 49%	2888
	21st to end	Night	11% 5% 2 5% 4 3 4 3 4 7% 51%	3234
September	1st to 10th	Night	10% 4 1 4 3 3 4 3 5% 9% 55%	1947
	11th to 20th	Night	11% 5% 2 4 4 3 4 3 7% 8% 50%	2194
	21st to end	Night	13% 6% 2 4 3 4 4 3 5% 8% 49%	2200
October	1st to 10th	Night	14% 7% 2 6% 4 3 4 4 6% 7% 42%	2365
	11th to 20th	Night	16% 10% 3 6% 4 3 4 4 5% 7% 38%	2400
	21st to end	Night	16% 13% 3 8% 4 4 5% 4 4 7% 32%	2810
November	1st to 10th	Night	11% 13% 5% 11% 6% 4 4 4 5% 6% 32%	2826
	11th to 20th	Night	11% 15% 6% 12% 6% 5% 4 3 5% 6% 27%	2940
	21st to end	Night	11% 11% 5% 12% 8% 6% 5% 4 5% 6% 27%	2940
December	1st to 10th	Night	6% 15% 6% 16% 13% 9% 6% 4 5% 5% 15%	4984
	11th to 20th	Night	9% 15% 6% 15% 8% 6% 5% 3 6% 5% 22%	5718
	21st to end	Night	14% 15% 7% 16% 8% 6% 4 4 5% 4 17%	7645

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% 4 8% 14% 6%	4125
	11th to 20th	Day	70% 4 9% 13% 4	4277
	21st to end	Day	61% 4 10% 19% 7%	5315
February	1st to 10th	Day	59% 6% 12% 16% 7%	1890
	11th to 20th	Day	54% 6% 12% 18% 9% 1	1853
	21st to end	Day	57% 7% 13% 16% 7%	1630
March	1st to 10th	Day	47% 5% 16% 20% 11% 1	4820
	11th to 20th	Day	52% 5% 14% 22% 6%	5090
	21st to end	Day	58% 4 10% 22% 7%	5585
April	1st to 10th	Day	53% 5% 10% 20% 11% 1	2498
	11th to 20th	Day	54% 5% 12% 18% 10% 1	2702
	21st to end	Day	53% 5% 12% 20% 9% 1	2730
May	1st to 10th	Day	37% 4 12% 30% 16% 1	7826
	11th to 20th	Day	44% 5% 9% 25% 14% 2	8226
	21st to end	Day	39% 5% 9% 30% 15% 2	9641
June	1st to 10th	Day	41% 7% 17% 25% 9%	3150
	11th to 20th	Day	40% 7% 16% 27% 10% 1	3150
	21st to end	Day	42% 7% 16% 27% 7% 1	3150
July	1st to 10th	Day	32% 9% 23% 30% 6%	6876
	11th to 20th	Day	34% 6% 18% 32% 8%	6869
	21st to end	Day	34% 7% 18% 31% 9%	7123
August	1st to 10th	Day	34% 7% 16% 28% 15% 1	4220
	11th to 20th	Day	37% 6% 16% 32% 9%	4210
	21st to end	Day	33% 5% 19% 34% 9%	4674
September	1st to 10th	Day	34% 6% 14% 32% 12% 1	2452
	11th to 20th	Day	40% 6% 19% 27% 7%	2204
	21st to end	Day	38% 6% 15% 33% 7%	2200
October	1st to 10th	Day	35% 4 13% 31% 17% 1	3275
	11th to 20th	Day	42% 3 11% 26% 17%	3240
	21st to end	Day	51% 5% 12% 25% 7%	3260
November	1st to 10th	Day	57% 5% 12% 17% 8% 1	1692
	11th to 20th	Day	61% 6% 10% 15% 7% 1	1680
	21st to end	Day	61% 6% 14% 13% 5%	1680
December	1st to 10th	Day	72% 5% 11% 9% 2 1	2413
	11th to 20th	Day	59% 4 13% 15% 8%	2710
	21st to end	Day	71% 4 8% 14% 3	3575
January	1st to 10th	Night	65% 5% 12% 12% 7%	8800
	11th to 20th	Night	67% 4 8% 15% 5%	8712
	21st to end	Night	56% 5% 11% 20% 8%	8897
February	1st to 10th	Night	55% 6% 14% 17% 7%	2730
	11th to 20th	Night	48% 7% 12% 20% 12%	2664
	21st to end	Night	53% 6% 12% 20% 8% 1	2195
March	1st to 10th	Night	45% 5% 16% 22% 10% 2	5264
	11th to 20th	Night	52% 5% 13% 17% 12%	5090
	21st to end	Night	58% 4 10% 19% 8% 1	5588
April	1st to 10th	Night	46% 5% 11% 23% 13% 1	2116
	11th to 20th	Night	50% 5% 10% 19% 13% 2	1869
	21st to end	Night	48% 5% 11% 24% 10% 2	1890
May	1st to 10th	Night	35% 4 12% 30% 18%	5120
	11th to 20th	Night	39% 5% 10% 24% 20% 3	4671
	21st to end	Night	35% 4 10% 29% 19% 2	4565
June	1st to 10th	Night	34% 7% 19% 29% 10% 1	1470
	11th to 20th	Night	36% 8% 14% 25% 14% 3	1470
	21st to end	Night	34% 8% 17% 32% 8% 1	1470
July	1st to 10th	Night	27% 9% 23% 32% 9% 1	3215
	11th to 20th	Night	25% 6% 19% 38% 11% 1	3208
	21st to end	Night	32% 7% 24% 27% 10% 1	3656
August	1st to 10th	Night	28% 6% 16% 34% 15% 1	2916
	11th to 20th	Night	31% 7% 17% 34% 11% 1	2915
	21st to end	Night	33% 5% 18% 30% 13%	3234
September	1st to 10th	Night	27% 7% 16% 36% 13% 1	1947
	11th to 20th	Night	32% 7% 20% 29% 12%	2194
	21st to end	Night	34% 6% 13% 33% 14%	2200
October	1st to 10th	Night	33% 4 11% 35% 14% 2	3872
	11th to 20th	Night	41% 4 11% 28% 14% 1	3899
	21st to end	Night	48% 4 12% 26% 9%	4536
November	1st to 10th	Night	54% 5% 11% 19% 9% 2	2826
	11th to 20th	Night	59% 6% 12% 15% 7% 1	2940
	21st to end	Night	58% 5% 16% 15% 6%	2940
December	1st to 10th	Night	72% 6% 11% 10% 2	4984
	11th to 20th	Night	64% 4 11% 14% 7%	5716
	21st to end	Night	70% 5% 8% 12% 4	7645

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	11% 11% 40% 25% 10% 3	330
	11th to 20th	Day	12% 8% 40% 29% 11%	330
	21st to end	Day	14% 10% 39% 26% 10% 2	363
February	1st to 10th	Day	12% 15% 38% 26% 6% 2	330
	11th to 20th	Day	10% 13% 40% 21% 14% 2	330
	21st to end	Day	8% 8% 47% 29% 7%	273
March	1st to 10th	Day	15% 13% 36% 26% 9% 2	330
	11th to 20th	Day	16% 12% 36% 22% 12% 3	330
	21st to end	Day	16% 16% 33% 27% 6% 3	363
April	1st to 10th	Day	20% 16% 29% 25% 8% 2	518
	11th to 20th	Day	23% 14% 31% 24% 7% 1	740
	21st to end	Day	23% 10% 30% 25% 11% 1	750
May	1st to 10th	Day	19% 12% 28% 29% 9% 3	753
	11th to 20th	Day	19% 11% 30% 26% 13% 2	775
	21st to end	Day	17% 8% 27% 29% 16% 3	844
June	1st to 10th	Day	13% 10% 28% 29% 16% 4	780
	11th to 20th	Day	15% 10% 37% 26% 11% 2	780
	21st to end	Day	13% 8% 29% 30% 15% 5%	780
July	1st to 10th	Day	8% 4 23% 35% 21% 9%	771
	11th to 20th	Day	11% 6% 32% 26% 19% 5%	768
	21st to end	Day	5% 5% 28% 33% 22% 7%	845
August	1st to 10th	Day	9% 5% 24% 33% 24% 5%	726
	11th to 20th	Day	12% 4 21% 34% 20% 9%	715
	21st to end	Day	12% 7% 27% 31% 19% 4	803
September	1st to 10th	Day	12% 8% 27% 32% 17% 3	582
	11th to 20th	Day	15% 9% 34% 31% 9% 3	334
	21st to end	Day	15% 10% 36% 23% 11% 5%	330
October	1st to 10th	Day	17% 11% 29% 29% 11% 2	330
	11th to 20th	Day	19% 12% 35% 26% 7% 1	330
	21st to end	Day	21% 13% 34% 22% 8% 2	363
November	1st to 10th	Day	20% 12% 31% 28% 9% 1	330
	11th to 20th	Day	18% 18% 37% 20% 6%	330
	21st to end	Day	19% 14% 33% 28% 5%	330
December	1st to 10th	Day	18% 11% 35% 28% 7% 1	330
	11th to 20th	Day	20% 15% 35% 25% 5%	330
	21st to end	Day	19% 11% 33% 25% 9% 3	363
January	1st to 10th	Night	10% 8% 39% 30% 11% 2	1050
	11th to 20th	Night	14% 8% 38% 32% 8%	1050
	21st to end	Night	15% 8% 40% 30% 7%	1155
February	1st to 10th	Night	13% 9% 33% 35% 8% 1	1050
	11th to 20th	Night	12% 9% 38% 29% 10% 2	1029
	21st to end	Night	11% 10% 38% 28% 11% 2	811
March	1st to 10th	Night	14% 9% 36% 30% 11% 1	740
	11th to 20th	Night	11% 9% 41% 30% 7% 1	630
	21st to end	Night	20% 8% 34% 26% 11% 2	693
April	1st to 10th	Night	18% 9% 35% 30% 8% 1	630
	11th to 20th	Night	21% 10% 34% 27% 7% 1	623
	21st to end	Night	22% 6% 29% 32% 11%	630
May	1st to 10th	Night	19% 6% 31% 34% 9% 1	630
	11th to 20th	Night	17% 6% 35% 32% 10% 1	621
	21st to end	Night	15% 5% 34% 31% 14%	683
June	1st to 10th	Night	14% 5% 29% 37% 15%	630
	11th to 20th	Night	13% 6% 31% 40% 10%	630
	21st to end	Night	10% 5% 27% 41% 16% 1	630
July	1st to 10th	Night	7% 2 24% 45% 21% 2	615
	11th to 20th	Night	6% 3 30% 41% 19% 1	612
	21st to end	Night	7% 3 24% 45% 20% 3	687
August	1st to 10th	Night	7% 3 20% 49% 21% 1	597
	11th to 20th	Night	11% 3 21% 41% 22% 2	594
	21st to end	Night	10% 5% 26% 40% 17% 2	660
September	1st to 10th	Night	11% 4 27% 40% 16% 2	600
	11th to 20th	Night	12% 5% 32% 39% 13%	600
	21st to end	Night	14% 6% 33% 34% 13%	600
October	1st to 10th	Night	19% 8% 34% 31% 7%	765
	11th to 20th	Night	21% 10% 32% 28% 8% 1	800
	21st to end	Night	21% 11% 33% 29% 6%	1050
November	1st to 10th	Night	17% 9% 37% 28% 8% 1	1025
	11th to 20th	Night	18% 11% 35% 28% 7% 1	1050
	21st to end	Night	16% 11% 41% 25% 6% 1	1050
December	1st to 10th	Night	13% 10% 37% 30% 10%	1050
	11th to 20th	Night	19% 10% 38% 26% 6% 1	1050
	21st to end	Night	23% 8% 33% 27% 8% 1	1155

Page generated at 2026-07-28 02:25:24. Version ac07

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