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 2025-03-27.

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% 4 9% 6% 5% 5% 4 6% 7% 34%	108699
	Night	10% 10% 4 10% 6% 5% 5% 4 6% 7% 32%	110839
Transparency	Day	47% 6% 14% 24% 9%	112198
	Night	50% 6% 13% 22% 9% 1	115498
Seeing	Day	15% 9% 31% 28% 14% 3	16597
	Night	15% 7% 33% 32% 11% 1	26724

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	4 11% 7% 18% 8% 7% 8% 6% 6% 6% 19%	3178
	11th to 20th	Day	4 9% 4 14% 10% 10% 11% 10% 8% 6% 12%	3261
	21st to end	Day	5% 15% 10% 18% 8% 6% 5% 4 5% 7% 18%	4105
February	1st to 10th	Day	8% 14% 6% 11% 7% 5% 7% 6% 8% 6% 23%	1800
	11th to 20th	Day	5% 12% 4 9% 8% 8% 8% 4 9% 8% 24%	1754
	21st to end	Day	6% 12% 4 12% 8% 8% 8% 4 6% 7% 26%	1555
March	1st to 10th	Day	12% 11% 4 9% 8% 4 5% 4 5% 7% 31%	3383
	11th to 20th	Day	8% 9% 5% 12% 8% 5% 5% 4 6% 8% 30%	3590
	21st to end	Day	15% 15% 5% 10% 5% 4 4 3 5% 6% 28%	3880
April	1st to 10th	Day	12% 12% 4 9% 6% 5% 5% 4 5% 7% 31%	2260
	11th to 20th	Day	17% 12% 4 8% 6% 5% 5% 4 5% 6% 30%	2442
	21st to end	Day	19% 9% 4 9% 4 4 4 4 6% 6% 31%	2470
May	1st to 10th	Day	18% 9% 3 7% 4 4 4 4 5% 7% 34%	4198
	11th to 20th	Day	15% 8% 2 8% 5% 5% 5% 4 6% 7% 34%	4399
	21st to end	Day	19% 9% 3 6% 5% 4 5% 3 5% 6% 34%	5157
June	1st to 10th	Day	15% 5% 2 6% 4 5% 5% 5% 6% 9% 38%	2850
	11th to 20th	Day	15% 6% 2 6% 5% 4 4 4 6% 9% 40%	2850
	21st to end	Day	11% 7% 3 6% 5% 5% 4 4 7% 9% 39%	2850
July	1st to 10th	Day	7% 4 2 5% 4 5% 6% 5% 9% 12% 40%	4750
	11th to 20th	Day	7% 3 2 5% 3 4 5% 5% 8% 10% 49%	4750
	21st to end	Day	6% 4 2 5% 4 5% 5% 5% 8% 9% 48%	4998
August	1st to 10th	Day	10% 5% 2 6% 4 4 5% 4 6% 8% 47%	4104
	11th to 20th	Day	11% 6% 2 6% 4 4 4 4 7% 8% 43%	4041
	21st to end	Day	12% 5% 2 6% 3 3 3 3 5% 8% 50%	4532
September	1st to 10th	Day	12% 6% 2 5% 3 3 3 3 5% 8% 50%	2330
	11th to 20th	Day	13% 7% 2 5% 4 4 4 3 5% 8% 44%	2094
	21st to end	Day	13% 7% 2 6% 4 3 4 4 6% 7% 43%	2090
October	1st to 10th	Day	17% 9% 3 7% 4 3 3 3 5% 6% 39%	1914
	11th to 20th	Day	15% 11% 4 7% 4 4 3 3 5% 7% 36%	1900
	21st to end	Day	14% 14% 5% 10% 4 5% 4 3 5% 7% 29%	1926
November	1st to 10th	Day	13% 16% 5% 10% 6% 5% 3 4 4 5% 30%	1610
	11th to 20th	Day	13% 15% 6% 14% 6% 5% 5% 3 4 4 26%	1600
	21st to end	Day	10% 14% 5% 14% 8% 6% 4 4 5% 5% 24%	1600
December	1st to 10th	Day	11% 14% 6% 16% 9% 11% 5% 4 5% 6% 13%	2341
	11th to 20th	Day	9% 18% 7% 11% 6% 4 5% 5% 7% 7% 22%	2639
	21st to end	Day	13% 15% 7% 18% 8% 6% 4 3 4 4 17%	3498
January	1st to 10th	Night	4 10% 6% 18% 9% 10% 7% 6% 6% 6% 18%	6787
	11th to 20th	Night	4 13% 5% 14% 9% 9% 10% 8% 8% 6% 13%	6643
	21st to end	Night	6% 16% 7% 16% 6% 5% 6% 4 6% 6% 21%	6871
February	1st to 10th	Night	8% 12% 5% 11% 6% 6% 7% 5% 7% 6% 27%	2600
	11th to 20th	Night	7% 10% 4 9% 6% 6% 6% 5% 8% 8% 31%	2533
	21st to end	Night	7% 11% 5% 11% 8% 6% 5% 4 6% 7% 30%	2094
March	1st to 10th	Night	7% 11% 4 11% 8% 6% 4 4 4 6% 34%	3683
	11th to 20th	Night	7% 11% 4 10% 9% 6% 5% 3 5% 6% 35%	3589
	21st to end	Night	14% 15% 6% 12% 5% 4 4 3 4 6% 29%	3889
April	1st to 10th	Night	11% 10% 3 8% 5% 5% 3 4 7% 8% 36%	1914
	11th to 20th	Night	16% 12% 4 7% 4 4 3 3 5% 6% 34%	1689
	21st to end	Night	17% 10% 3 7% 5% 4 3 3 5% 6% 36%	1710
May	1st to 10th	Night	17% 9% 3 7% 4 4 4 4 6% 7% 37%	2750
	11th to 20th	Night	14% 6% 2 6% 5% 4 5% 4 6% 7% 40%	2506
	21st to end	Night	16% 8% 2 5% 4 3 3 3 4 7% 44%	2427
June	1st to 10th	Night	12% 6% 2 4 3 3 5% 5% 7% 8% 45%	1330
	11th to 20th	Night	12% 5% 2 5% 5% 4 6% 3 5% 9% 45%	1330
	21st to end	Night	8% 6% 2 4 5% 4 5% 4 7% 8% 48%	1330
July	1st to 10th	Night	8% 3 2 4 3 3 5% 5% 7% 11% 49%	2220
	11th to 20th	Night	4 3 2 4 3 3 4 3 5% 9% 61%	2220
	21st to end	Night	6% 4 1 5% 4 4 4 4 7% 11% 51%	2564
August	1st to 10th	Night	5% 3 2 5% 3 5% 4 4 7% 8% 53%	2836
	11th to 20th	Night	11% 3 2 5% 4 3 4 4 7% 8% 49%	2798
	21st to end	Night	11% 6% 2 5% 4 3 3 3 4 7% 52%	3135
September	1st to 10th	Night	10% 4 1 4 3 3 4 2 5% 9% 55%	1849
	11th to 20th	Night	11% 4 2 4 4 3 4 3 7% 7% 51%	2084
	21st to end	Night	14% 6% 2 4 3 4 4 3 6% 8% 47%	2090
October	1st to 10th	Night	15% 8% 2 6% 4 3 4 4 6% 7% 41%	2247
	11th to 20th	Night	16% 10% 3 6% 4 3 4 4 5% 7% 38%	2280
	21st to end	Night	16% 13% 3 8% 4 4 5% 4 4 7% 32%	2669
November	1st to 10th	Night	12% 13% 5% 10% 6% 4 4 4 5% 7% 32%	2688
	11th to 20th	Night	11% 16% 6% 13% 7% 5% 4 3 5% 6% 25%	2800
	21st to end	Night	11% 11% 5% 12% 8% 6% 5% 4 5% 7% 27%	2800
December	1st to 10th	Night	6% 15% 6% 16% 13% 9% 6% 4 5% 5% 14%	4836
	11th to 20th	Night	9% 15% 6% 15% 9% 6% 5% 3 6% 5% 22%	5568
	21st to end	Night	14% 14% 7% 17% 8% 6% 4 4 5% 4 17%	7480

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	64% 5% 8% 16% 7%	3179
	11th to 20th	Day	68% 4 9% 16% 3	3289
	21st to end	Day	67% 4 11% 13% 4	4105
February	1st to 10th	Day	58% 6% 12% 16% 8%	1800
	11th to 20th	Day	54% 5% 12% 18% 9% 1	1763
	21st to end	Day	57% 7% 13% 16% 7%	1555
March	1st to 10th	Day	51% 5% 12% 22% 8%	3385
	11th to 20th	Day	50% 6% 15% 24% 5%	3590
	21st to end	Day	58% 5% 10% 21% 6%	3880
April	1st to 10th	Day	51% 6% 11% 20% 11% 1	2260
	11th to 20th	Day	55% 5% 11% 18% 10% 1	2442
	21st to end	Day	53% 5% 12% 20% 8% 1	2470
May	1st to 10th	Day	47% 5% 14% 22% 10% 1	4209
	11th to 20th	Day	46% 7% 12% 24% 10% 1	4403
	21st to end	Day	48% 7% 11% 27% 7% 1	5157
June	1st to 10th	Day	41% 8% 17% 25% 9%	2850
	11th to 20th	Day	40% 7% 16% 26% 10% 1	2850
	21st to end	Day	41% 7% 16% 28% 7% 1	2850
July	1st to 10th	Day	32% 10% 21% 29% 8%	4676
	11th to 20th	Day	27% 7% 20% 34% 11%	4669
	21st to end	Day	30% 8% 18% 35% 9% 1	4839
August	1st to 10th	Day	34% 7% 16% 28% 14% 1	4090
	11th to 20th	Day	37% 6% 16% 31% 9%	4080
	21st to end	Day	34% 5% 18% 34% 9%	4531
September	1st to 10th	Day	34% 6% 14% 32% 13% 1	2330
	11th to 20th	Day	39% 6% 19% 28% 7% 1	2094
	21st to end	Day	39% 7% 15% 32% 7%	2090
October	1st to 10th	Day	35% 4 13% 31% 16% 1	3174
	11th to 20th	Day	41% 4 11% 27% 17%	3140
	21st to end	Day	51% 5% 12% 25% 8%	3159
November	1st to 10th	Day	56% 5% 12% 17% 8% 1	1610
	11th to 20th	Day	62% 6% 10% 14% 7%	1600
	21st to end	Day	61% 6% 15% 13% 5%	1600
December	1st to 10th	Day	72% 5% 11% 9% 2 1	2341
	11th to 20th	Day	59% 4 13% 15% 8%	2640
	21st to end	Day	71% 4 8% 14% 3	3498
January	1st to 10th	Night	64% 5% 10% 13% 8%	6787
	11th to 20th	Night	66% 5% 9% 14% 6%	6690
	21st to end	Night	63% 6% 12% 15% 4	6871
February	1st to 10th	Night	54% 6% 14% 18% 7%	2600
	11th to 20th	Night	48% 7% 13% 20% 12%	2534
	21st to end	Night	52% 6% 12% 20% 9% 1	2094
March	1st to 10th	Night	50% 6% 12% 22% 9% 1	3694
	11th to 20th	Night	48% 7% 15% 20% 10%	3590
	21st to end	Night	57% 5% 10% 19% 8% 1	3889
April	1st to 10th	Night	45% 5% 12% 24% 14% 1	1914
	11th to 20th	Night	50% 5% 10% 19% 13% 3	1689
	21st to end	Night	48% 5% 11% 23% 10% 2	1710
May	1st to 10th	Night	45% 6% 12% 25% 11% 1	2759
	11th to 20th	Night	41% 7% 11% 25% 13% 3	2507
	21st to end	Night	41% 5% 11% 31% 11% 1	2427
June	1st to 10th	Night	34% 7% 18% 29% 10% 2	1330
	11th to 20th	Night	36% 8% 14% 24% 14% 3	1330
	21st to end	Night	32% 8% 18% 33% 8% 1	1330
July	1st to 10th	Night	27% 10% 23% 30% 10% 1	2185
	11th to 20th	Night	21% 6% 15% 45% 12% 1	2178
	21st to end	Night	27% 6% 23% 32% 11% 1	2483
August	1st to 10th	Night	27% 6% 16% 35% 14% 1	2826
	11th to 20th	Night	30% 7% 17% 34% 11% 1	2825
	21st to end	Night	33% 5% 18% 30% 13%	3135
September	1st to 10th	Night	27% 7% 16% 35% 13% 1	1849
	11th to 20th	Night	31% 7% 20% 30% 13%	2084
	21st to end	Night	35% 6% 13% 33% 14%	2090
October	1st to 10th	Night	33% 4 11% 35% 14% 2	3754
	11th to 20th	Night	41% 4 11% 29% 14% 1	3779
	21st to end	Night	48% 4 11% 26% 10%	4395
November	1st to 10th	Night	53% 5% 11% 20% 9% 1	2688
	11th to 20th	Night	60% 6% 12% 15% 6% 1	2800
	21st to end	Night	58% 5% 16% 15% 6%	2800
December	1st to 10th	Night	72% 6% 11% 9% 2	4836
	11th to 20th	Night	64% 4 10% 14% 7%	5566
	21st to end	Night	70% 5% 8% 12% 4	7480

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% 10% 39% 26% 11% 3	300
	11th to 20th	Day	12% 7% 39% 29% 12%	300
	21st to end	Day	15% 10% 37% 25% 11% 3	330
February	1st to 10th	Day	13% 15% 38% 26% 6% 2	300
	11th to 20th	Day	10% 14% 42% 20% 13% 2	300
	21st to end	Day	8% 8% 46% 31% 7%	249
March	1st to 10th	Day	13% 14% 34% 27% 10% 2	300
	11th to 20th	Day	16% 11% 35% 21% 13% 3	300
	21st to end	Day	18% 13% 30% 29% 6% 3	315
April	1st to 10th	Day	17% 16% 31% 25% 9% 2	440
	11th to 20th	Day	23% 14% 30% 24% 8% 1	640
	21st to end	Day	22% 10% 31% 24% 12% 1	650
May	1st to 10th	Day	21% 12% 27% 28% 8% 3	653
	11th to 20th	Day	17% 9% 30% 28% 13% 2	675
	21st to end	Day	18% 9% 28% 27% 16% 3	734
June	1st to 10th	Day	12% 9% 28% 30% 17% 4	680
	11th to 20th	Day	15% 9% 35% 26% 12% 2	680
	21st to end	Day	12% 7% 30% 30% 16% 5%	680
July	1st to 10th	Day	8% 4 24% 33% 22% 9%	671
	11th to 20th	Day	11% 6% 30% 26% 21% 6%	668
	21st to end	Day	5% 4 26% 33% 24% 7%	739
August	1st to 10th	Day	8% 4 24% 33% 24% 6%	676
	11th to 20th	Day	12% 4 21% 34% 20% 9%	665
	21st to end	Day	13% 7% 27% 31% 19% 4	748
September	1st to 10th	Day	12% 8% 28% 33% 17% 3	540
	11th to 20th	Day	14% 10% 34% 31% 9% 3	304
	21st to end	Day	16% 11% 37% 22% 11% 2	300
October	1st to 10th	Day	18% 12% 28% 29% 10% 3	300
	11th to 20th	Day	17% 11% 35% 28% 8% 1	300
	21st to end	Day	21% 13% 35% 21% 8% 2	330
November	1st to 10th	Day	19% 10% 31% 29% 10% 1	300
	11th to 20th	Day	19% 17% 37% 20% 6%	300
	21st to end	Day	20% 13% 34% 28% 5%	300
December	1st to 10th	Day	18% 10% 35% 29% 7% 1	300
	11th to 20th	Day	19% 15% 36% 26% 5%	300
	21st to end	Day	18% 11% 33% 25% 10% 3	330
January	1st to 10th	Night	10% 8% 38% 30% 12% 2	1000
	11th to 20th	Night	14% 8% 37% 33% 8% 1	1000
	21st to end	Night	15% 8% 39% 29% 7%	1100
February	1st to 10th	Night	13% 9% 33% 35% 9% 1	1000
	11th to 20th	Night	12% 9% 39% 29% 10% 2	979
	21st to end	Night	12% 9% 38% 29% 11% 2	774
March	1st to 10th	Night	14% 8% 36% 30% 11% 2	705
	11th to 20th	Night	11% 9% 41% 31% 7% 1	600
	21st to end	Night	20% 7% 32% 28% 11% 3	647
April	1st to 10th	Night	17% 8% 35% 30% 8% 1	570
	11th to 20th	Night	22% 9% 34% 26% 8% 1	563
	21st to end	Night	22% 6% 29% 31% 12%	570
May	1st to 10th	Night	19% 7% 32% 31% 9% 1	570
	11th to 20th	Night	17% 6% 34% 33% 11% 1	561
	21st to end	Night	15% 6% 35% 30% 13%	617
June	1st to 10th	Night	15% 5% 28% 36% 16%	570
	11th to 20th	Night	14% 5% 31% 39% 11%	570
	21st to end	Night	10% 4 27% 41% 17% 1	570
July	1st to 10th	Night	7% 2 24% 44% 22% 2	555
	11th to 20th	Night	6% 3 28% 42% 20% 1	552
	21st to end	Night	6% 2 23% 45% 21% 3	624
August	1st to 10th	Night	7% 2 20% 50% 20% 1	567
	11th to 20th	Night	11% 3 21% 41% 22% 2	564
	21st to end	Night	11% 5% 25% 40% 17% 2	627
September	1st to 10th	Night	12% 3 27% 40% 15% 2	570
	11th to 20th	Night	12% 4 32% 38% 13%	570
	21st to end	Night	15% 6% 34% 34% 11%	570
October	1st to 10th	Night	20% 8% 33% 31% 8%	727
	11th to 20th	Night	21% 10% 33% 28% 8% 1	760
	21st to end	Night	21% 11% 33% 29% 7%	997
November	1st to 10th	Night	18% 8% 37% 28% 9% 1	975
	11th to 20th	Night	18% 11% 35% 28% 7% 1	1000
	21st to end	Night	16% 11% 41% 25% 6% 1	1000
December	1st to 10th	Night	14% 10% 36% 30% 10%	1000
	11th to 20th	Night	19% 9% 39% 27% 7% 1	1000
	21st to end	Night	23% 7% 33% 28% 8% 1	1100

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