Dodgeville
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Dodgeville clear sky chart from 2005-11-06 to 2024-12-06.

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	13% 9% 3 8% 5% 4 4 4 6% 7% 38%	101771
	Night	13% 10% 4 8% 5% 4 4 3 5% 6% 39%	98044
Transparency	Day	45% 4 12% 25% 13% 1	105300
	Night	45% 4 11% 24% 15% 2	102655
Seeing	Day	17% 11% 29% 25% 13% 4	16001
	Night	17% 10% 31% 30% 11% 1	25887

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	10% 15% 9% 16% 6% 5% 3 2 4 5% 26%	2527
	11th to 20th	Day	10% 10% 5% 16% 7% 5% 6% 9% 7% 6% 20%	2530
	21st to end	Day	15% 18% 9% 12% 5% 4 3 3 4 6% 21%	2987
February	1st to 10th	Day	11% 13% 6% 9% 5% 5% 5% 4 6% 7% 31%	1710
	11th to 20th	Day	13% 11% 4 7% 5% 4 5% 4 5% 7% 35%	1749
	21st to end	Day	13% 13% 4 8% 5% 5% 5% 3 4 6% 33%	1570
March	1st to 10th	Day	14% 9% 3 6% 4 3 3 3 4 6% 45%	3120
	11th to 20th	Day	11% 7% 3 8% 5% 4 4 4 5% 7% 43%	3439
	21st to end	Day	21% 13% 4 10% 4 4 4 3 4 5% 27%	4063
April	1st to 10th	Day	18% 12% 4 7% 5% 5% 4 4 5% 6% 31%	2280
	11th to 20th	Day	17% 11% 3 9% 5% 4 4 4 5% 5% 35%	2254
	21st to end	Day	20% 9% 3 8% 5% 5% 4 3 6% 6% 32%	2302
May	1st to 10th	Day	16% 8% 3 8% 5% 5% 5% 4 6% 7% 37%	4300
	11th to 20th	Day	13% 7% 2 7% 5% 4 4 3 5% 8% 42%	4399
	21st to end	Day	14% 7% 3 7% 5% 4 5% 4 5% 8% 39%	4824
June	1st to 10th	Day	11% 5% 2 5% 5% 4 4 4 6% 9% 45%	2660
	11th to 20th	Day	11% 6% 2 6% 4 5% 5% 4 7% 9% 42%	2660
	21st to end	Day	12% 6% 3 6% 5% 5% 5% 4 6% 9% 40%	2660
July	1st to 10th	Day	10% 6% 3 8% 5% 6% 6% 6% 7% 9% 35%	4440
	11th to 20th	Day	5% 3 2 6% 4 4 5% 4 7% 9% 50%	4440
	21st to end	Day	8% 6% 3 8% 5% 5% 5% 4 6% 9% 41%	4813
August	1st to 10th	Day	10% 5% 3 7% 4 5% 6% 5% 7% 9% 40%	4267
	11th to 20th	Day	10% 5% 2 6% 4 4 5% 4 5% 8% 46%	3866
	21st to end	Day	9% 6% 2 6% 4 4 5% 4 7% 9% 45%	4180
September	1st to 10th	Day	13% 5% 2 7% 5% 4 4 3 5% 6% 45%	2280
	11th to 20th	Day	13% 5% 2 4 3 3 4 4 6% 7% 49%	2250
	21st to end	Day	13% 7% 3 7% 4 4 4 3 5% 7% 44%	2081
October	1st to 10th	Day	13% 6% 3 7% 4 3 3 3 4 6% 48%	1900
	11th to 20th	Day	18% 9% 3 7% 4 4 3 3 5% 6% 38%	1900
	21st to end	Day	17% 10% 3 6% 4 4 3 2 4 5% 41%	1952
November	1st to 10th	Day	10% 9% 5% 8% 4 4 3 3 6% 6% 43%	1762
	11th to 20th	Day	14% 13% 4 8% 5% 5% 4 3 5% 6% 33%	1745
	21st to end	Day	14% 13% 3 9% 5% 4 3 3 4 7% 36%	1600
December	1st to 10th	Day	13% 15% 4 10% 6% 3 3 4 5% 6% 31%	1560
	11th to 20th	Day	13% 12% 5% 10% 6% 4 5% 4 5% 7% 28%	1918
	21st to end	Day	16% 21% 9% 13% 6% 3 4 3 4 4 16%	2783
January	1st to 10th	Night	11% 13% 8% 13% 6% 5% 4 3 4 4 30%	4428
	11th to 20th	Night	11% 15% 6% 14% 7% 4 4 5% 8% 5% 21%	4440
	21st to end	Night	15% 19% 8% 12% 5% 5% 4 3 4 5% 22%	4678
February	1st to 10th	Night	10% 14% 4 10% 6% 5% 4 4 4 5% 32%	2470
	11th to 20th	Night	10% 10% 4 7% 7% 5% 5% 3 5% 5% 39%	2317
	21st to end	Night	15% 13% 4 7% 4 4 4 3 5% 5% 36%	1884
March	1st to 10th	Night	16% 11% 3 6% 4 4 3 3 4 5% 41%	3733
	11th to 20th	Night	10% 6% 2 6% 4 4 4 3 7% 7% 46%	3549
	21st to end	Night	24% 13% 4 10% 4 4 3 3 3 5% 26%	3567
April	1st to 10th	Night	16% 10% 2 8% 5% 3 4 4 4 6% 38%	1900
	11th to 20th	Night	18% 9% 2 7% 5% 4 4 3 5% 5% 39%	1875
	21st to end	Night	17% 8% 3 6% 5% 4 5% 4 6% 7% 36%	1876
May	1st to 10th	Night	17% 7% 3 6% 5% 4 5% 4 6% 6% 37%	2599
	11th to 20th	Night	11% 9% 2 6% 5% 4 5% 4 5% 6% 42%	2506
	21st to end	Night	10% 7% 2 7% 4 4 4 3 6% 7% 44%	2743
June	1st to 10th	Night	9% 4 2 5% 5% 4 5% 5% 6% 9% 46%	1520
	11th to 20th	Night	12% 6% 2 4 3 4 4 4 5% 9% 47%	1520
	21st to end	Night	8% 7% 3 4 4 3 5% 3 6% 8% 49%	1520
July	1st to 10th	Night	13% 7% 3 5% 3 4 4 4 6% 8% 42%	2530
	11th to 20th	Night	4 3 1 4 4 4 4 4 5% 8% 57%	2530
	21st to end	Night	6% 4 2 5% 5% 5% 5% 4 5% 9% 50%	2750
August	1st to 10th	Night	10% 4 2 5% 3 5% 5% 4 6% 7% 50%	2669
	11th to 20th	Night	10% 5% 2 5% 4 4 4 4 5% 8% 49%	2965
	21st to end	Night	9% 5% 2 6% 4 4 4 4 5% 7% 50%	3476
September	1st to 10th	Night	9% 4 2 4 3 3 4 3 5% 7% 56%	1900
	11th to 20th	Night	10% 4 2 5% 4 4 4 3 5% 6% 52%	1910
	21st to end	Night	10% 6% 2 4 4 4 4 4 5% 6% 52%	2095
October	1st to 10th	Night	12% 6% 2 4 3 4 4 3 5% 5% 52%	2280
	11th to 20th	Night	15% 8% 2 6% 4 3 4 4 5% 6% 43%	2280
	21st to end	Night	16% 10% 3 7% 4 4 4 4 4 7% 37%	2646
November	1st to 10th	Night	12% 8% 2 7% 4 3 3 3 5% 5% 48%	2536
	11th to 20th	Night	14% 11% 4 8% 6% 5% 5% 3 5% 5% 34%	2652
	21st to end	Night	15% 11% 4 8% 5% 3 4 3 5% 6% 38%	2800
December	1st to 10th	Night	13% 12% 5% 10% 6% 5% 5% 4 6% 6% 31%	2737
	11th to 20th	Night	14% 12% 4 12% 6% 5% 5% 4 4 5% 28%	3279
	21st to end	Night	18% 17% 6% 13% 6% 5% 4 3 5% 4 19%	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	63% 2 12% 15% 7%	2528
	11th to 20th	Day	60% 3 13% 16% 8% 1	2530
	21st to end	Day	67% 2 10% 15% 5%	2987
February	1st to 10th	Day	53% 2 12% 20% 11% 1	1710
	11th to 20th	Day	48% 4 10% 26% 10% 2	1758
	21st to end	Day	53% 4 9% 21% 11% 3	1570
March	1st to 10th	Day	43% 2 11% 28% 13% 3	3120
	11th to 20th	Day	40% 4 10% 33% 12% 1	3439
	21st to end	Day	62% 3 11% 17% 6% 1	4063
April	1st to 10th	Day	54% 4 9% 21% 11%	2280
	11th to 20th	Day	52% 3 8% 22% 12% 2	2254
	21st to end	Day	51% 4 11% 20% 13% 1	2302
May	1st to 10th	Day	47% 4 10% 23% 16% 1	4339
	11th to 20th	Day	42% 4 10% 33% 12%	4403
	21st to end	Day	43% 5% 9% 25% 15% 3	4837
June	1st to 10th	Day	36% 5% 14% 28% 16% 1	2660
	11th to 20th	Day	39% 4 13% 24% 18% 1	2660
	21st to end	Day	41% 5% 13% 26% 13% 2	2660
July	1st to 10th	Day	44% 6% 14% 28% 8% 1	4371
	11th to 20th	Day	29% 5% 15% 33% 17% 1	4365
	21st to end	Day	39% 6% 14% 21% 18% 2	4662
August	1st to 10th	Day	39% 5% 15% 27% 13% 1	4252
	11th to 20th	Day	36% 5% 13% 31% 14% 1	3905
	21st to end	Day	34% 4 13% 32% 15% 1	4179
September	1st to 10th	Day	39% 5% 11% 26% 18% 2	2280
	11th to 20th	Day	34% 4 12% 32% 17% 2	2250
	21st to end	Day	40% 4 10% 29% 16% 1	2081
October	1st to 10th	Day	25% 2 6% 40% 25% 1	3160
	11th to 20th	Day	35% 3 9% 27% 24% 3	3140
	21st to end	Day	43% 2 10% 28% 15% 3	3190
November	1st to 10th	Day	42% 3 13% 26% 13% 2	1762
	11th to 20th	Day	52% 3 12% 21% 10% 1	1745
	21st to end	Day	50% 4 15% 23% 8% 1	1600
December	1st to 10th	Day	54% 3 13% 20% 9% 1	1560
	11th to 20th	Day	56% 3 15% 15% 9% 2	1915
	21st to end	Day	73% 2 9% 11% 5%	2783
January	1st to 10th	Night	58% 3 10% 20% 9% 1	4428
	11th to 20th	Night	62% 3 10% 16% 9%	4440
	21st to end	Night	67% 3 8% 16% 6% 1	4678
February	1st to 10th	Night	54% 3 11% 19% 13% 2	2470
	11th to 20th	Night	46% 3 11% 24% 14% 1	2318
	21st to end	Night	50% 2 11% 22% 11% 4	1884
March	1st to 10th	Night	47% 3 10% 25% 10% 5%	3733
	11th to 20th	Night	35% 4 9% 33% 18% 2	3549
	21st to end	Night	62% 2 7% 18% 9% 1	3567
April	1st to 10th	Night	48% 3 10% 23% 14% 2	1900
	11th to 20th	Night	48% 3 7% 19% 19% 3	1875
	21st to end	Night	47% 4 12% 22% 13% 3	1876
May	1st to 10th	Night	48% 4 10% 17% 19% 1	2625
	11th to 20th	Night	42% 4 11% 26% 17% 1	2507
	21st to end	Night	35% 7% 11% 24% 21% 2	2751
June	1st to 10th	Night	34% 5% 13% 28% 18% 1	1520
	11th to 20th	Night	35% 4 10% 26% 22% 2	1520
	21st to end	Night	34% 4 16% 23% 18% 4	1520
July	1st to 10th	Night	40% 5% 16% 25% 12% 2	2490
	11th to 20th	Night	25% 5% 14% 35% 17% 3	2482
	21st to end	Night	31% 6% 17% 22% 20% 4	2662
August	1st to 10th	Night	33% 5% 13% 29% 19% 1	2660
	11th to 20th	Night	33% 4 13% 32% 17% 1	2992
	21st to end	Night	33% 5% 13% 27% 18% 4	3476
September	1st to 10th	Night	29% 4 11% 29% 25% 2	1900
	11th to 20th	Night	33% 4 10% 32% 18% 2	1910
	21st to end	Night	33% 4 9% 30% 22% 1	2095
October	1st to 10th	Night	25% 3 5% 37% 28% 1	3800
	11th to 20th	Night	32% 2 11% 26% 27% 2	3779
	21st to end	Night	45% 3 9% 27% 15% 2	4358
November	1st to 10th	Night	39% 3 11% 27% 17% 2	2536
	11th to 20th	Night	51% 3 12% 20% 12% 2	2652
	21st to end	Night	49% 3 13% 25% 10% 1	2800
December	1st to 10th	Night	54% 3 12% 21% 8% 1	2737
	11th to 20th	Night	58% 3 12% 18% 8% 1	3281
	21st to end	Night	69% 3 8% 15% 5%	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% 31% 25% 9% 2	270
	11th to 20th	Day	20% 15% 39% 19% 6% 1	270
	21st to end	Day	22% 15% 34% 25% 4	297
February	1st to 10th	Day	16% 19% 42% 17% 5%	270
	11th to 20th	Day	21% 22% 34% 17% 6%	270
	21st to end	Day	21% 20% 44% 13% 2	225
March	1st to 10th	Day	17% 18% 43% 16% 4	270
	11th to 20th	Day	18% 21% 37% 16% 5% 2	270
	21st to end	Day	30% 12% 32% 19% 7% 1	443
April	1st to 10th	Day	27% 15% 33% 19% 5%	460
	11th to 20th	Day	24% 19% 26% 19% 12% 1	452
	21st to end	Day	23% 16% 27% 21% 11% 2	460
May	1st to 10th	Day	21% 14% 32% 25% 8% 1	591
	11th to 20th	Day	18% 13% 29% 24% 13% 3	675
	21st to end	Day	17% 10% 26% 26% 15% 6%	734
June	1st to 10th	Day	11% 7% 27% 32% 18% 5%	680
	11th to 20th	Day	13% 8% 32% 29% 15% 4	680
	21st to end	Day	14% 8% 31% 28% 14% 5%	680
July	1st to 10th	Day	8% 4 19% 32% 26% 11%	671
	11th to 20th	Day	8% 6% 26% 32% 20% 8%	668
	21st to end	Day	7% 5% 27% 34% 20% 7%	739
August	1st to 10th	Day	8% 4 22% 34% 23% 9%	676
	11th to 20th	Day	13% 6% 20% 27% 23% 11%	568
	21st to end	Day	11% 7% 21% 32% 20% 8%	539
September	1st to 10th	Day	17% 6% 21% 32% 19% 6%	490
	11th to 20th	Day	12% 5% 20% 34% 22% 7%	490
	21st to end	Day	17% 9% 28% 26% 17% 3	481
October	1st to 10th	Day	15% 11% 29% 28% 15% 1	300
	11th to 20th	Day	24% 19% 31% 19% 6%	300
	21st to end	Day	26% 16% 33% 18% 5% 2	330
November	1st to 10th	Day	14% 18% 41% 20% 7% 2	300
	11th to 20th	Day	20% 21% 33% 18% 7% 1	300
	21st to end	Day	23% 12% 41% 21% 3	300
December	1st to 10th	Day	17% 19% 38% 18% 7% 1	285
	11th to 20th	Day	20% 11% 40% 21% 7%	270
	21st to end	Day	29% 16% 37% 16% 2	297
January	1st to 10th	Night	16% 16% 36% 24% 7% 1	950
	11th to 20th	Night	18% 14% 38% 24% 5% 1	950
	21st to end	Night	20% 12% 36% 26% 5%	1045
February	1st to 10th	Night	18% 13% 37% 26% 5%	950
	11th to 20th	Night	16% 15% 40% 26% 4	843
	21st to end	Night	22% 17% 37% 19% 4	628
March	1st to 10th	Night	20% 13% 38% 22% 6% 1	760
	11th to 20th	Night	17% 11% 36% 28% 7%	613
	21st to end	Night	25% 12% 31% 25% 7%	627
April	1st to 10th	Night	20% 15% 37% 23% 5%	570
	11th to 20th	Night	21% 13% 31% 28% 6%	563
	21st to end	Night	19% 9% 33% 28% 9% 1	570
May	1st to 10th	Night	19% 9% 33% 31% 7% 1	570
	11th to 20th	Night	16% 9% 30% 33% 11%	561
	21st to end	Night	14% 6% 28% 36% 16% 1	617
June	1st to 10th	Night	10% 5% 27% 42% 14% 1	570
	11th to 20th	Night	15% 5% 31% 36% 13%	570
	21st to end	Night	12% 5% 25% 42% 16% 1	570
July	1st to 10th	Night	8% 3 14% 42% 31% 3	555
	11th to 20th	Night	8% 4 19% 43% 24% 2	552
	21st to end	Night	8% 3 17% 45% 25% 2	624
August	1st to 10th	Night	7% 2 16% 46% 26% 3	567
	11th to 20th	Night	11% 2 15% 42% 23% 6%	564
	21st to end	Night	11% 3 17% 46% 20% 3	627
September	1st to 10th	Night	10% 4 22% 38% 20% 5%	570
	11th to 20th	Night	12% 3 23% 34% 24% 4	580
	21st to end	Night	13% 7% 27% 34% 18% 1	760
October	1st to 10th	Night	15% 7% 28% 31% 18% 1	760
	11th to 20th	Night	19% 12% 33% 27% 9%	760
	21st to end	Night	20% 13% 34% 25% 8%	836
November	1st to 10th	Night	16% 11% 39% 25% 9%	780
	11th to 20th	Night	19% 17% 37% 21% 6%	852
	21st to end	Night	20% 14% 35% 24% 6%	1000
December	1st to 10th	Night	19% 14% 39% 22% 5% 1	978
	11th to 20th	Night	22% 12% 37% 24% 5%	950
	21st to end	Night	26% 16% 35% 20% 3	1045

Page generated at 2024-12-03 05:45:13. Version ac07

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