Jackson (WI)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jackson (WI) clear sky chart from 2005-11-06 to 2024-11-28.

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	12% 9% 3 8% 5% 4 5% 4 6% 7% 38%	101596
	Night	13% 9% 3 7% 4 4 4 4 5% 7% 39%	98004
Transparency	Day	43% 5% 12% 25% 13% 1	105141
	Night	44% 4 12% 24% 14% 2	102600
Seeing	Day	16% 11% 30% 26% 12% 4	15980
	Night	17% 10% 31% 28% 12% 1	25848

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	12% 13% 6% 10% 6% 5% 5% 4 4 5% 30%	2527
	11th to 20th	Day	11% 12% 4 14% 6% 4 6% 6% 7% 8% 22%	2530
	21st to end	Day	17% 19% 8% 10% 4 3 4 3 4 5% 22%	2783
February	1st to 10th	Day	10% 13% 6% 9% 5% 3 4 5% 5% 7% 32%	1710
	11th to 20th	Day	13% 11% 4 8% 4 4 5% 4 5% 5% 37%	1842
	21st to end	Day	11% 15% 4 10% 5% 5% 5% 4 5% 7% 31%	1570
March	1st to 10th	Day	12% 9% 3 7% 5% 4 4 3 5% 6% 42%	3120
	11th to 20th	Day	10% 7% 3 8% 5% 5% 5% 3 6% 6% 42%	3271
	21st to end	Day	20% 13% 4 10% 4 4 4 3 4 5% 29%	4165
April	1st to 10th	Day	17% 13% 3 7% 6% 4 4 4 5% 5% 31%	2280
	11th to 20th	Day	16% 9% 4 8% 5% 5% 4 3 6% 6% 34%	2254
	21st to end	Day	17% 10% 3 7% 4 4 5% 4 6% 7% 32%	2413
May	1st to 10th	Day	15% 8% 3 7% 5% 4 4 4 5% 7% 38%	4104
	11th to 20th	Day	12% 6% 2 6% 5% 5% 4 3 6% 8% 44%	4399
	21st to end	Day	12% 7% 2 7% 4 4 4 4 7% 8% 40%	4824
June	1st to 10th	Day	9% 6% 2 6% 5% 4 4 4 7% 8% 45%	2660
	11th to 20th	Day	11% 6% 2 6% 5% 4 4 4 7% 8% 42%	2660
	21st to end	Day	9% 5% 2 6% 4 4 5% 5% 7% 9% 42%	2660
July	1st to 10th	Day	11% 7% 3 8% 5% 4 6% 5% 7% 9% 35%	4440
	11th to 20th	Day	5% 3 1 5% 4 5% 6% 5% 7% 11% 48%	4440
	21st to end	Day	7% 6% 2 7% 4 4 5% 4 7% 9% 45%	4813
August	1st to 10th	Day	10% 5% 2 7% 5% 5% 6% 4 7% 9% 40%	4409
	11th to 20th	Day	11% 5% 2 6% 4 5% 5% 4 7% 8% 43%	3824
	21st to end	Day	10% 7% 3 7% 4 4 4 4 6% 9% 43%	4180
September	1st to 10th	Day	10% 6% 3 6% 5% 4 5% 5% 5% 7% 45%	2280
	11th to 20th	Day	11% 5% 2 6% 3 4 5% 3 5% 8% 48%	2167
	21st to end	Day	13% 7% 2 6% 5% 4 5% 4 5% 7% 43%	2090
October	1st to 10th	Day	13% 7% 2 6% 4 4 4 4 5% 8% 44%	2019
	11th to 20th	Day	20% 8% 3 7% 4 4 4 4 6% 7% 31%	1867
	21st to end	Day	16% 8% 3 7% 4 4 5% 5% 4 6% 36%	1881
November	1st to 10th	Day	11% 9% 3 8% 4 4 4 2 5% 6% 43%	1762
	11th to 20th	Day	10% 11% 3 10% 7% 6% 5% 4 6% 8% 31%	1800
	21st to end	Day	16% 12% 3 6% 5% 4 4 3 5% 6% 36%	1631
December	1st to 10th	Day	14% 11% 4 8% 6% 6% 4 3 5% 8% 31%	1520
	11th to 20th	Day	12% 13% 4 8% 5% 5% 4 5% 7% 6% 30%	1918
	21st to end	Day	18% 19% 7% 14% 4 4 4 2 4 5% 19%	2783
January	1st to 10th	Night	14% 13% 7% 11% 4 4 4 3 4 4 33%	4428
	11th to 20th	Night	12% 13% 5% 15% 6% 5% 6% 5% 6% 6% 20%	4440
	21st to end	Night	15% 17% 7% 12% 5% 4 4 3 5% 6% 24%	4880
February	1st to 10th	Night	11% 14% 3 9% 5% 4 4 4 5% 5% 35%	2470
	11th to 20th	Night	12% 8% 3 7% 5% 5% 5% 4 5% 6% 40%	2223
	21st to end	Night	17% 12% 3 6% 4 4 4 3 5% 6% 35%	1884
March	1st to 10th	Night	15% 10% 3 6% 3 3 4 3 5% 6% 42%	3733
	11th to 20th	Night	10% 7% 2 6% 4 5% 4 4 6% 9% 44%	3704
	21st to end	Night	19% 11% 4 12% 5% 3 4 4 4 5% 30%	3466
April	1st to 10th	Night	16% 10% 3 7% 5% 4 4 3 5% 6% 37%	1900
	11th to 20th	Night	20% 9% 3 6% 4 3 4 3 5% 6% 37%	1875
	21st to end	Night	16% 8% 3 6% 3 4 5% 4 5% 6% 39%	1767
May	1st to 10th	Night	14% 8% 3 7% 5% 4 5% 3 6% 8% 37%	2790
	11th to 20th	Night	12% 6% 2 6% 4 5% 5% 5% 7% 9% 39%	2506
	21st to end	Night	12% 8% 3 7% 5% 4 4 4 5% 7% 41%	2743
June	1st to 10th	Night	10% 4 3 5% 4 5% 5% 3 6% 9% 46%	1520
	11th to 20th	Night	12% 5% 2 5% 4 4 4 5% 6% 9% 44%	1520
	21st to end	Night	9% 6% 2 6% 5% 4 4 3 6% 7% 48%	1520
July	1st to 10th	Night	12% 7% 3 7% 4 4 5% 4 6% 8% 41%	2530
	11th to 20th	Night	3 3 1 4 4 4 4 4 7% 8% 57%	2530
	21st to end	Night	6% 4 2 5% 4 5% 5% 4 6% 8% 50%	2750
August	1st to 10th	Night	10% 5% 2 5% 3 4 4 4 6% 8% 48%	2517
	11th to 20th	Night	9% 5% 2 5% 4 5% 4 3 6% 8% 49%	3001
	21st to end	Night	7% 5% 2 6% 4 4 4 4 6% 9% 49%	3476
September	1st to 10th	Night	9% 5% 2 6% 3 3 4 3 4 6% 56%	1900
	11th to 20th	Night	11% 3 1 4 4 4 4 4 5% 7% 54%	1992
	21st to end	Night	12% 7% 2 7% 4 3 4 3 4 8% 47%	2090
October	1st to 10th	Night	13% 6% 2 5% 4 4 3 3 4 6% 49%	2159
	11th to 20th	Night	16% 7% 2 6% 4 3 4 3 4 7% 43%	2312
	21st to end	Night	18% 9% 3 6% 4 4 4 3 6% 7% 36%	2717
November	1st to 10th	Night	12% 7% 2 6% 4 3 4 4 5% 6% 46%	2536
	11th to 20th	Night	14% 9% 3 8% 5% 5% 5% 3 6% 7% 35%	2600
	21st to end	Night	16% 9% 3 6% 5% 4 4 3 5% 6% 37%	2702
December	1st to 10th	Night	14% 12% 4 8% 5% 5% 5% 4 5% 7% 33%	2660
	11th to 20th	Night	13% 14% 4 8% 6% 5% 5% 3 6% 6% 30%	3279
	21st to end	Night	19% 18% 5% 9% 5% 4 4 3 4 6% 22%	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	58% 4 14% 17% 7%	2528
	11th to 20th	Day	59% 5% 12% 19% 5%	2530
	21st to end	Day	66% 3 8% 18% 5%	2783
February	1st to 10th	Day	52% 4 12% 21% 9% 1	1710
	11th to 20th	Day	48% 5% 10% 24% 11% 2	1852
	21st to end	Day	54% 4 11% 19% 11% 2	1570
March	1st to 10th	Day	43% 5% 10% 26% 13% 4	3120
	11th to 20th	Day	42% 4 12% 26% 15% 2	3271
	21st to end	Day	58% 3 12% 18% 7% 1	4165
April	1st to 10th	Day	53% 5% 11% 19% 11% 1	2280
	11th to 20th	Day	50% 5% 10% 20% 13% 3	2254
	21st to end	Day	49% 6% 12% 19% 12% 1	2413
May	1st to 10th	Day	45% 4 11% 24% 15% 1	4142
	11th to 20th	Day	40% 4 15% 27% 13% 1	4403
	21st to end	Day	40% 6% 12% 22% 16% 3	4837
June	1st to 10th	Day	36% 5% 14% 27% 17% 2	2660
	11th to 20th	Day	37% 6% 14% 25% 17% 1	2660
	21st to end	Day	37% 7% 15% 25% 16% 2	2660
July	1st to 10th	Day	43% 7% 12% 25% 11% 2	4371
	11th to 20th	Day	27% 7% 17% 32% 16% 1	4365
	21st to end	Day	35% 7% 16% 21% 20% 2	4662
August	1st to 10th	Day	38% 6% 14% 30% 11% 1	4394
	11th to 20th	Day	36% 7% 11% 33% 12% 1	3863
	21st to end	Day	37% 6% 13% 24% 18% 1	4179
September	1st to 10th	Day	37% 7% 10% 27% 17% 2	2280
	11th to 20th	Day	35% 4 12% 32% 17% 1	2167
	21st to end	Day	41% 4 11% 30% 13% 1	2090
October	1st to 10th	Day	25% 3 6% 40% 25% 1	3357
	11th to 20th	Day	37% 4 10% 27% 22% 1	3083
	21st to end	Day	41% 4 11% 28% 14% 2	3081
November	1st to 10th	Day	42% 4 13% 26% 14% 1	1762
	11th to 20th	Day	51% 5% 13% 21% 9% 1	1800
	21st to end	Day	49% 5% 13% 25% 8%	1631
December	1st to 10th	Day	53% 4 16% 19% 7% 1	1520
	11th to 20th	Day	52% 5% 15% 19% 7% 2	1915
	21st to end	Day	70% 3 9% 12% 5%	2783
January	1st to 10th	Night	56% 3 10% 20% 10% 1	4428
	11th to 20th	Night	64% 4 10% 15% 8%	4440
	21st to end	Night	63% 3 11% 17% 6%	4880
February	1st to 10th	Night	51% 4 10% 20% 12% 2	2470
	11th to 20th	Night	44% 4 11% 24% 15% 2	2224
	21st to end	Night	50% 3 12% 20% 13% 3	1884
March	1st to 10th	Night	44% 3 13% 26% 10% 3	3733
	11th to 20th	Night	36% 4 12% 26% 20% 3	3704
	21st to end	Night	58% 3 10% 17% 10% 2	3466
April	1st to 10th	Night	48% 5% 9% 20% 17% 1	1900
	11th to 20th	Night	48% 4 7% 21% 17% 3	1875
	21st to end	Night	44% 4 12% 23% 14% 2	1767
May	1st to 10th	Night	45% 4 13% 19% 16% 3	2817
	11th to 20th	Night	40% 5% 15% 26% 13% 1	2507
	21st to end	Night	42% 5% 11% 19% 15% 8%	2751
June	1st to 10th	Night	33% 6% 14% 27% 18% 2	1520
	11th to 20th	Night	35% 5% 11% 26% 21% 2	1520
	21st to end	Night	36% 4 16% 24% 18% 2	1520
July	1st to 10th	Night	41% 4 14% 24% 12% 4	2490
	11th to 20th	Night	23% 5% 17% 35% 18% 3	2482
	21st to end	Night	30% 6% 16% 21% 23% 4	2662
August	1st to 10th	Night	34% 5% 15% 26% 19% 2	2508
	11th to 20th	Night	32% 5% 13% 33% 16% 1	3028
	21st to end	Night	31% 5% 13% 27% 21% 3	3476
September	1st to 10th	Night	30% 5% 11% 28% 24% 2	1900
	11th to 20th	Night	31% 4 9% 36% 18% 2	1992
	21st to end	Night	38% 3 10% 32% 16% 1	2090
October	1st to 10th	Night	26% 3 7% 39% 23% 1	3601
	11th to 20th	Night	34% 3 13% 26% 21% 3	3835
	21st to end	Night	43% 4 9% 27% 17% 1	4467
November	1st to 10th	Night	39% 4 11% 27% 17% 2	2536
	11th to 20th	Night	48% 5% 13% 22% 11% 2	2600
	21st to end	Night	48% 5% 15% 22% 9% 1	2702
December	1st to 10th	Night	52% 4 13% 21% 8% 1	2660
	11th to 20th	Night	55% 5% 12% 17% 9% 1	3281
	21st to end	Night	66% 4 10% 14% 6%	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	16% 17% 38% 23% 5% 1	270
	11th to 20th	Day	16% 20% 34% 25% 5% 1	270
	21st to end	Day	24% 13% 36% 21% 4 1	297
February	1st to 10th	Day	12% 20% 45% 15% 6% 1	270
	11th to 20th	Day	18% 24% 38% 14% 6%	270
	21st to end	Day	21% 22% 42% 14%	225
March	1st to 10th	Day	16% 23% 44% 14% 2	270
	11th to 20th	Day	23% 19% 32% 19% 7% 1	291
	21st to end	Day	26% 14% 29% 23% 6% 1	506
April	1st to 10th	Day	26% 13% 37% 20% 4	460
	11th to 20th	Day	21% 20% 27% 22% 8% 2	452
	21st to end	Day	21% 13% 29% 25% 11% 1	460
May	1st to 10th	Day	23% 11% 33% 24% 7% 2	472
	11th to 20th	Day	20% 10% 32% 26% 9% 3	675
	21st to end	Day	15% 7% 31% 28% 12% 6%	734
June	1st to 10th	Day	9% 8% 33% 32% 14% 4	680
	11th to 20th	Day	14% 9% 29% 32% 13% 5%	680
	21st to end	Day	11% 8% 32% 31% 15% 4	680
July	1st to 10th	Day	9% 3 20% 34% 24% 10%	671
	11th to 20th	Day	8% 5% 26% 34% 19% 7%	668
	21st to end	Day	7% 3 26% 37% 21% 6%	739
August	1st to 10th	Day	7% 3 24% 38% 18% 9%	675
	11th to 20th	Day	11% 5% 16% 31% 25% 12%	479
	21st to end	Day	11% 6% 19% 33% 22% 9%	539
September	1st to 10th	Day	11% 9% 23% 28% 21% 8%	490
	11th to 20th	Day	10% 4 22% 31% 23% 10%	490
	21st to end	Day	16% 12% 24% 26% 16% 6%	490
October	1st to 10th	Day	20% 9% 25% 27% 13% 5%	419
	11th to 20th	Day	21% 18% 33% 20% 9%	300
	21st to end	Day	24% 16% 37% 18% 3 1	330
November	1st to 10th	Day	16% 18% 35% 21% 8% 1	300
	11th to 20th	Day	17% 20% 37% 19% 7%	300
	21st to end	Day	24% 12% 40% 20% 4	291
December	1st to 10th	Day	21% 20% 38% 15% 6% 1	270
	11th to 20th	Day	21% 18% 37% 16% 6% 1	270
	21st to end	Day	25% 19% 37% 16% 3 1	297
January	1st to 10th	Night	19% 17% 36% 23% 5%	950
	11th to 20th	Night	21% 15% 38% 19% 7% 1	950
	21st to end	Night	19% 13% 37% 25% 6%	1045
February	1st to 10th	Night	19% 14% 37% 24% 5%	950
	11th to 20th	Night	18% 16% 36% 25% 4	748
	21st to end	Night	24% 16% 38% 18% 5%	628
March	1st to 10th	Night	19% 12% 35% 24% 8% 1	760
	11th to 20th	Night	14% 13% 38% 26% 8%	738
	21st to end	Night	22% 6% 30% 31% 9% 1	627
April	1st to 10th	Night	21% 12% 34% 26% 6%	570
	11th to 20th	Night	24% 10% 32% 25% 7% 1	563
	21st to end	Night	22% 6% 30% 29% 12% 1	570
May	1st to 10th	Night	17% 8% 31% 35% 7% 1	570
	11th to 20th	Night	19% 5% 29% 32% 14% 1	561
	21st to end	Night	13% 4 24% 37% 20% 2	617
June	1st to 10th	Night	12% 3 25% 41% 18% 1	570
	11th to 20th	Night	13% 3 30% 36% 16% 2	570
	21st to end	Night	11% 3 25% 42% 18% 1	570
July	1st to 10th	Night	9% 2 14% 41% 29% 5%	555
	11th to 20th	Night	7% 2 21% 43% 24% 4	552
	21st to end	Night	7% 2 20% 43% 27% 1	624
August	1st to 10th	Night	8% 2 17% 44% 27% 3	567
	11th to 20th	Night	10% 3 16% 38% 29% 5%	564
	21st to end	Night	10% 2 18% 40% 27% 3	627
September	1st to 10th	Night	10% 4 21% 35% 26% 5%	570
	11th to 20th	Night	11% 4 20% 31% 28% 5%	662
	21st to end	Night	14% 8% 23% 28% 22% 5%	760
October	1st to 10th	Night	16% 7% 27% 31% 16% 1	760
	11th to 20th	Night	20% 12% 32% 27% 8% 1	760
	21st to end	Night	23% 11% 32% 25% 8% 1	836
November	1st to 10th	Night	17% 11% 38% 24% 10% 1	780
	11th to 20th	Night	19% 17% 36% 21% 7%	800
	21st to end	Night	21% 13% 37% 22% 6%	929
December	1st to 10th	Night	23% 16% 36% 20% 5%	950
	11th to 20th	Night	22% 13% 37% 21% 5% 1	950
	21st to end	Night	28% 15% 35% 19% 3	1045

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