Jasper-Pulaski Fish and Wildlife Area
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jasper-Pulaski Fish and Wildlife Area clear sky chart from 2005-11-06 to 2025-05-26.

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% 4 5% 4 6% 7% 36%	113717
	Night	15% 10% 4 8% 5% 4 4 3 5% 6% 36%	115705
Transparency	Day	46% 6% 12% 22% 13% 2	117316
	Night	47% 5% 11% 21% 14% 2	120236
Seeing	Day	17% 10% 28% 24% 15% 6%	16410
	Night	19% 9% 29% 30% 12% 1	26363

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% 13% 8% 14% 5% 4 4 4 6% 7% 23%	3617
	11th to 20th	Day	11% 16% 7% 14% 6% 7% 4 6% 4 3 21%	3620
	21st to end	Day	20% 18% 5% 9% 4 4 3 3 4 5% 25%	4000
February	1st to 10th	Day	16% 15% 5% 12% 6% 4 4 4 4 5% 26%	1948
	11th to 20th	Day	15% 11% 5% 9% 5% 5% 4 3 5% 7% 31%	1948
	21st to end	Day	17% 13% 5% 9% 4 4 4 3 6% 6% 29%	1650
March	1st to 10th	Day	19% 14% 5% 8% 4 3 3 2 3 4 34%	4480
	11th to 20th	Day	9% 9% 4 7% 5% 4 5% 4 5% 7% 42%	4704
	21st to end	Day	18% 13% 6% 10% 6% 6% 5% 4 5% 5% 22%	5865
April	1st to 10th	Day	18% 12% 3 8% 4 4 4 4 6% 6% 32%	2400
	11th to 20th	Day	17% 10% 3 6% 4 3 4 4 5% 6% 37%	2374
	21st to end	Day	19% 9% 3 7% 5% 4 4 4 5% 7% 34%	2555
May	1st to 10th	Day	18% 8% 3 7% 4 5% 5% 4 7% 8% 31%	4212
	11th to 20th	Day	15% 7% 2 7% 4 4 5% 4 6% 9% 37%	4211
	21st to end	Day	10% 6% 2 5% 4 4 4 4 6% 9% 45%	4895
June	1st to 10th	Day	11% 5% 2 6% 4 5% 5% 4 7% 8% 43%	2660
	11th to 20th	Day	10% 5% 2 5% 4 5% 5% 4 7% 7% 45%	2660
	21st to end	Day	11% 6% 2 6% 6% 5% 5% 5% 6% 9% 39%	2660
July	1st to 10th	Day	13% 7% 2 7% 5% 6% 6% 5% 7% 9% 35%	4440
	11th to 20th	Day	7% 4 2 5% 4 4 6% 5% 7% 11% 46%	4440
	21st to end	Day	9% 6% 2 7% 5% 5% 6% 4 6% 9% 41%	4813
August	1st to 10th	Day	8% 5% 2 6% 5% 5% 5% 4 6% 8% 47%	4167
	11th to 20th	Day	9% 5% 2 5% 5% 4 5% 4 7% 9% 46%	3834
	21st to end	Day	7% 4 2 5% 4 4 5% 4 6% 10% 49%	4180
September	1st to 10th	Day	10% 5% 2 6% 4 4 5% 4 5% 8% 48%	2280
	11th to 20th	Day	11% 4 2 5% 4 4 4 4 7% 8% 47%	2104
	21st to end	Day	11% 7% 2 6% 5% 4 5% 4 6% 8% 42%	2090
October	1st to 10th	Day	12% 6% 2 6% 3 3 4 4 5% 7% 46%	2090
	11th to 20th	Day	18% 7% 2 6% 4 5% 5% 3 5% 6% 39%	1881
	21st to end	Day	21% 8% 3 8% 5% 4 5% 3 6% 6% 31%	1881
November	1st to 10th	Day	12% 8% 2 6% 4 4 4 3 6% 6% 46%	1762
	11th to 20th	Day	19% 11% 3 7% 6% 4 3 3 5% 6% 35%	1800
	21st to end	Day	18% 13% 3 8% 5% 4 4 3 4 5% 34%	1800
December	1st to 10th	Day	11% 12% 3 8% 4 3 4 3 4 7% 40%	2706
	11th to 20th	Day	14% 15% 6% 13% 6% 5% 5% 3 5% 6% 22%	3008
	21st to end	Day	27% 21% 7% 12% 5% 4 4 3 4 4 11%	3982
January	1st to 10th	Night	15% 15% 8% 13% 6% 4 3 3 5% 5% 22%	6348
	11th to 20th	Night	14% 19% 8% 13% 7% 4 4 3 5% 4 19%	6360
	21st to end	Night	20% 15% 5% 9% 4 4 4 3 3 4 29%	6974
February	1st to 10th	Night	18% 13% 5% 8% 6% 4 4 3 4 5% 29%	2450
	11th to 20th	Night	15% 11% 4 8% 5% 5% 4 3 4 6% 35%	2338
	21st to end	Night	19% 13% 3 8% 4 4 3 3 4 5% 32%	1980
March	1st to 10th	Night	16% 12% 4 7% 4 4 4 3 4 5% 38%	5373
	11th to 20th	Night	13% 7% 2 6% 4 4 4 4 6% 7% 44%	5242
	21st to end	Night	18% 10% 3 8% 5% 4 5% 4 5% 6% 31%	5105
April	1st to 10th	Night	14% 9% 3 6% 5% 4 4 3 5% 7% 38%	2000
	11th to 20th	Night	18% 10% 2 6% 4 4 4 3 4 7% 38%	1975
	21st to end	Night	17% 8% 3 6% 5% 4 4 4 6% 6% 37%	1845
May	1st to 10th	Night	16% 9% 3 7% 6% 5% 4 4 6% 8% 33%	2903
	11th to 20th	Night	18% 6% 2 5% 3 4 4 4 6% 8% 39%	2885
	21st to end	Night	11% 7% 3 6% 4 5% 5% 3 5% 7% 44%	2788
June	1st to 10th	Night	10% 5% 2 5% 4 5% 3 4 5% 8% 49%	1520
	11th to 20th	Night	8% 5% 2 6% 4 5% 4 4 6% 8% 48%	1520
	21st to end	Night	11% 5% 2 6% 5% 6% 5% 4 6% 9% 42%	1520
July	1st to 10th	Night	9% 5% 2 6% 5% 4 4 4 6% 9% 44%	2530
	11th to 20th	Night	7% 4 2 5% 4 3 4 3 5% 8% 55%	2530
	21st to end	Night	6% 5% 2 7% 6% 4 5% 5% 7% 9% 44%	2750
August	1st to 10th	Night	8% 5% 2 6% 5% 4 4 4 7% 9% 47%	2761
	11th to 20th	Night	7% 5% 2 5% 3 4 4 4 6% 8% 51%	2977
	21st to end	Night	8% 5% 2 6% 4 4 4 4 5% 7% 52%	3476
September	1st to 10th	Night	10% 4 2 6% 4 4 3 3 5% 6% 52%	1900
	11th to 20th	Night	9% 4 1 4 3 3 4 3 5% 8% 55%	2057
	21st to end	Night	11% 6% 2 6% 4 3 5% 4 5% 8% 46%	2090
October	1st to 10th	Night	12% 5% 2 5% 3 4 4 3 5% 6% 52%	2090
	11th to 20th	Night	17% 7% 2 6% 3 3 4 3 4 6% 45%	2294
	21st to end	Night	20% 9% 2 6% 4 4 3 4 5% 5% 38%	2717
November	1st to 10th	Night	13% 8% 2 6% 4 4 3 3 5% 7% 44%	2536
	11th to 20th	Night	14% 10% 3 8% 4 4 4 4 6% 6% 36%	2600
	21st to end	Night	18% 11% 4 8% 5% 4 4 3 4 6% 33%	2600
December	1st to 10th	Night	12% 9% 3 8% 4 3 4 3 5% 6% 43%	4476
	11th to 20th	Night	17% 14% 5% 10% 6% 4 5% 4 4 5% 27%	5199
	21st to end	Night	26% 18% 6% 10% 5% 5% 4 3 4 5% 14%	6996

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	59% 5% 10% 19% 6% 1	3618
	11th to 20th	Day	67% 3 9% 7% 10% 3	3620
	21st to end	Day	64% 3 11% 15% 7%	4000
February	1st to 10th	Day	61% 5% 11% 16% 7% 1	1948
	11th to 20th	Day	53% 5% 10% 23% 9% 1	1958
	21st to end	Day	54% 6% 12% 18% 8% 2	1650
March	1st to 10th	Day	55% 4 8% 21% 10% 2	4480
	11th to 20th	Day	41% 5% 11% 33% 10% 1	4704
	21st to end	Day	61% 6% 14% 13% 5% 1	5867
April	1st to 10th	Day	51% 6% 11% 20% 12%	2400
	11th to 20th	Day	47% 6% 11% 23% 11% 3	2374
	21st to end	Day	49% 6% 12% 20% 11% 2	2555
May	1st to 10th	Day	48% 8% 13% 23% 8%	4250
	11th to 20th	Day	43% 8% 14% 24% 10% 1	4215
	21st to end	Day	32% 8% 13% 23% 22% 2	4908
June	1st to 10th	Day	36% 7% 13% 24% 16% 4	2660
	11th to 20th	Day	35% 8% 11% 23% 20% 4	2660
	21st to end	Day	39% 9% 15% 19% 15% 3	2660
July	1st to 10th	Day	44% 7% 13% 21% 13% 2	4371
	11th to 20th	Day	30% 7% 15% 30% 16% 2	4365
	21st to end	Day	40% 7% 14% 18% 18% 3	4662
August	1st to 10th	Day	34% 7% 15% 28% 15% 1	4152
	11th to 20th	Day	33% 7% 13% 29% 17% 1	3873
	21st to end	Day	30% 6% 14% 26% 20% 4	4179
September	1st to 10th	Day	33% 7% 13% 25% 17% 4	2280
	11th to 20th	Day	33% 5% 13% 25% 20% 4	2104
	21st to end	Day	38% 5% 11% 24% 20% 2	2090
October	1st to 10th	Day	25% 4 10% 32% 26% 2	3480
	11th to 20th	Day	36% 4 11% 22% 26%	3097
	21st to end	Day	43% 4 10% 27% 13% 2	3081
November	1st to 10th	Day	38% 5% 15% 25% 14% 3	1762
	11th to 20th	Day	51% 4 12% 20% 12% 1	1800
	21st to end	Day	53% 4 13% 21% 8% 1	1800
December	1st to 10th	Day	45% 3 16% 26% 9%	2706
	11th to 20th	Day	61% 5% 13% 16% 4	3005
	21st to end	Day	78% 4 7% 8% 2	3982
January	1st to 10th	Night	64% 4 9% 15% 8%	6348
	11th to 20th	Night	69% 3 10% 8% 9% 2	6360
	21st to end	Night	61% 3 10% 17% 9% 1	6974
February	1st to 10th	Night	57% 5% 11% 16% 9% 2	2450
	11th to 20th	Night	52% 4 11% 20% 12% 1	2339
	21st to end	Night	54% 5% 12% 17% 10% 3	1980
March	1st to 10th	Night	49% 5% 9% 25% 11% 2	5373
	11th to 20th	Night	39% 5% 13% 26% 15% 2	5242
	21st to end	Night	52% 6% 11% 22% 8% 1	5105
April	1st to 10th	Night	44% 6% 14% 21% 14% 2	2000
	11th to 20th	Night	46% 5% 9% 21% 15% 3	1975
	21st to end	Night	47% 6% 10% 22% 12% 3	1845
May	1st to 10th	Night	48% 7% 11% 21% 12% 1	2930
	11th to 20th	Night	42% 8% 15% 24% 11% 1	2886
	21st to end	Night	38% 8% 11% 17% 22% 4	2796
June	1st to 10th	Night	32% 5% 13% 26% 21% 2	1520
	11th to 20th	Night	33% 6% 12% 24% 21% 4	1520
	21st to end	Night	37% 8% 16% 20% 15% 4	1520
July	1st to 10th	Night	36% 5% 14% 26% 13% 5%	2490
	11th to 20th	Night	27% 6% 12% 26% 27% 2	2482
	21st to end	Night	34% 7% 16% 19% 19% 5%	2662
August	1st to 10th	Night	32% 7% 17% 28% 15% 1	2752
	11th to 20th	Night	29% 6% 15% 29% 19% 1	3004
	21st to end	Night	31% 6% 11% 29% 20% 3	3476
September	1st to 10th	Night	31% 6% 13% 23% 20% 6%	1900
	11th to 20th	Night	27% 6% 8% 28% 27% 4	2057
	21st to end	Night	35% 6% 10% 26% 19% 3	2090
October	1st to 10th	Night	22% 4 8% 34% 31% 1	3480
	11th to 20th	Night	35% 3 8% 24% 28% 1	3804
	21st to end	Night	38% 4 9% 26% 21% 2	4467
November	1st to 10th	Night	40% 5% 10% 25% 17% 3	2536
	11th to 20th	Night	46% 6% 12% 21% 14% 2	2600
	21st to end	Night	54% 4 10% 23% 9%	2600
December	1st to 10th	Night	43% 3 15% 27% 10% 2	4476
	11th to 20th	Night	60% 5% 12% 14% 8% 1	5201
	21st to end	Night	73% 4 9% 10% 4	6996

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	23% 16% 34% 21% 5% 1	300
	11th to 20th	Day	23% 19% 35% 17% 4 2	300
	21st to end	Day	27% 17% 32% 19% 5%	330
February	1st to 10th	Day	23% 18% 35% 19% 4	300
	11th to 20th	Day	25% 16% 37% 18% 4 1	300
	21st to end	Day	24% 17% 40% 13% 5%	249
March	1st to 10th	Day	23% 20% 37% 19% 2	300
	11th to 20th	Day	23% 17% 34% 20% 7%	380
	21st to end	Day	29% 14% 32% 19% 6% 1	550
April	1st to 10th	Day	24% 14% 30% 22% 7% 2	500
	11th to 20th	Day	22% 15% 33% 17% 10% 3	492
	21st to end	Day	24% 14% 30% 21% 9% 2	500
May	1st to 10th	Day	23% 11% 28% 25% 9% 3	503
	11th to 20th	Day	20% 9% 28% 22% 16% 5%	527
	21st to end	Day	14% 6% 28% 26% 18% 8%	760
June	1st to 10th	Day	11% 8% 27% 28% 19% 6%	680
	11th to 20th	Day	12% 7% 25% 32% 19% 6%	680
	21st to end	Day	13% 6% 30% 29% 15% 6%	680
July	1st to 10th	Day	11% 3 19% 28% 21% 18%	671
	11th to 20th	Day	9% 2 24% 29% 22% 13%	668
	21st to end	Day	10% 3 19% 33% 24% 11%	739
August	1st to 10th	Day	9% 2 18% 28% 30% 13%	524
	11th to 20th	Day	11% 3 21% 28% 24% 13%	479
	21st to end	Day	10% 2 16% 32% 28% 12%	539
September	1st to 10th	Day	11% 5% 19% 30% 26% 9%	490
	11th to 20th	Day	10% 3 16% 27% 29% 16%	490
	21st to end	Day	15% 9% 20% 24% 24% 8%	490
October	1st to 10th	Day	15% 5% 28% 28% 19% 6%	490
	11th to 20th	Day	19% 17% 26% 25% 11% 1	339
	21st to end	Day	32% 11% 36% 15% 5% 1	330
November	1st to 10th	Day	14% 12% 37% 22% 11% 4	300
	11th to 20th	Day	25% 13% 34% 18% 8% 2	300
	21st to end	Day	28% 13% 37% 18% 5%	300
December	1st to 10th	Day	18% 17% 38% 20% 6%	300
	11th to 20th	Day	22% 16% 38% 18% 6%	300
	21st to end	Day	31% 15% 35% 16% 3	330
January	1st to 10th	Night	22% 16% 35% 22% 5%	1000
	11th to 20th	Night	25% 15% 35% 22% 4	1000
	21st to end	Night	23% 13% 36% 24% 4	1100
February	1st to 10th	Night	24% 12% 37% 23% 4	850
	11th to 20th	Night	22% 15% 34% 26% 4	783
	21st to end	Night	25% 13% 38% 21% 3	660
March	1st to 10th	Night	21% 13% 37% 24% 5%	800
	11th to 20th	Night	19% 10% 39% 26% 6%	800
	21st to end	Night	24% 10% 34% 26% 6%	725
April	1st to 10th	Night	19% 12% 38% 25% 6%	600
	11th to 20th	Night	22% 9% 34% 27% 7% 1	593
	21st to end	Night	21% 10% 34% 27% 8%	600
May	1st to 10th	Night	21% 7% 34% 30% 8% 1	600
	11th to 20th	Night	20% 5% 27% 32% 14% 1	591
	21st to end	Night	13% 3 24% 40% 19% 1	634
June	1st to 10th	Night	11% 2 24% 45% 16%	570
	11th to 20th	Night	11% 2 27% 41% 19% 1	570
	21st to end	Night	12% 3 23% 40% 21% 1	570
July	1st to 10th	Night	8% 2 15% 41% 28% 6%	555
	11th to 20th	Night	10% 2 16% 39% 29% 4	552
	21st to end	Night	7% 2 13% 46% 31% 1	624
August	1st to 10th	Night	7% 1 10% 46% 31% 5%	567
	11th to 20th	Night	9% 1 13% 43% 31% 3	564
	21st to end	Night	9% 1 14% 38% 34% 3	627
September	1st to 10th	Night	12% 2 14% 41% 27% 4	570
	11th to 20th	Night	10% 3 15% 37% 30% 3	727
	21st to end	Night	13% 6% 23% 31% 25% 3	760
October	1st to 10th	Night	14% 5% 23% 37% 19% 2	760
	11th to 20th	Night	20% 12% 28% 29% 9%	760
	21st to end	Night	24% 13% 31% 26% 7%	836
November	1st to 10th	Night	18% 11% 35% 26% 9% 1	780
	11th to 20th	Night	21% 14% 33% 25% 7% 1	800
	21st to end	Night	24% 14% 32% 25% 6%	800
December	1st to 10th	Night	24% 13% 35% 23% 5%	935
	11th to 20th	Night	25% 11% 32% 27% 6%	1000
	21st to end	Night	33% 11% 29% 23% 4	1100

Page generated at 2025-05-23 08:21:03. Version ac07

Copyright © 2025 Attilla Danko.