Mequon Rotary Park
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Mequon Rotary Park clear sky chart from 2005-11-06 to 2024-11-02.

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% 8% 3 7% 5% 5% 5% 4 6% 7% 38%	101349
	Night	14% 10% 3 7% 5% 4 4 4 5% 7% 37%	97693
Transparency	Day	45% 3 12% 25% 13% 2	101140
	Night	48% 2 11% 24% 13% 2	97574
Seeing	Day	15% 6% 25% 31% 18% 4	15890
	Night	19% 7% 26% 29% 16% 3	25733

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% 14% 6% 10% 5% 5% 5% 4 5% 7% 27%	2527
	11th to 20th	Day	11% 12% 6% 12% 5% 4 7% 7% 10% 6% 19%	2530
	21st to end	Day	17% 17% 8% 10% 5% 5% 4 3 5% 6% 20%	2783
February	1st to 10th	Day	10% 13% 6% 10% 6% 5% 6% 4 5% 7% 29%	1708
	11th to 20th	Day	13% 11% 4 7% 5% 5% 5% 5% 6% 6% 35%	1848
	21st to end	Day	12% 12% 5% 10% 6% 4 5% 4 6% 5% 32%	1570
March	1st to 10th	Day	12% 9% 3 7% 5% 4 4 4 6% 5% 42%	3120
	11th to 20th	Day	11% 6% 2 8% 6% 6% 5% 4 5% 6% 42%	3264
	21st to end	Day	20% 11% 4 9% 5% 5% 4 3 4 6% 29%	4165
April	1st to 10th	Day	17% 11% 3 7% 5% 4 5% 4 6% 7% 32%	2280
	11th to 20th	Day	15% 9% 3 7% 5% 6% 4 4 6% 6% 35%	2254
	21st to end	Day	17% 9% 3 6% 5% 5% 5% 4 6% 6% 34%	2422
May	1st to 10th	Day	15% 8% 3 8% 4 5% 4 4 6% 6% 37%	4082
	11th to 20th	Day	12% 6% 2 7% 5% 5% 6% 5% 7% 8% 38%	4389
	21st to end	Day	11% 7% 2 6% 5% 4 5% 4 6% 9% 41%	4824
June	1st to 10th	Day	10% 6% 2 6% 5% 5% 5% 4 6% 8% 44%	2660
	11th to 20th	Day	10% 6% 2 6% 5% 4 5% 4 6% 8% 43%	2660
	21st to end	Day	9% 5% 2 6% 4 5% 5% 5% 8% 8% 44%	2660
July	1st to 10th	Day	12% 7% 3 7% 5% 5% 5% 4 6% 9% 37%	4440
	11th to 20th	Day	4 3 2 4 4 4 5% 5% 8% 12% 49%	4440
	21st to end	Day	6% 5% 2 6% 5% 5% 5% 4 6% 9% 48%	4813
August	1st to 10th	Day	10% 5% 2 5% 5% 4 6% 5% 7% 8% 44%	4396
	11th to 20th	Day	10% 4 2 5% 4 4 5% 4 6% 8% 48%	3835
	21st to end	Day	8% 6% 2 6% 5% 4 5% 4 6% 9% 45%	4180
September	1st to 10th	Day	11% 5% 2 6% 4 4 4 3 7% 7% 47%	2280
	11th to 20th	Day	11% 5% 2 5% 4 4 4 4 4 8% 50%	2159
	21st to end	Day	12% 6% 2 6% 5% 5% 5% 3 6% 9% 42%	2090
October	1st to 10th	Day	14% 6% 2 6% 3 3 4 4 5% 7% 45%	2032
	11th to 20th	Day	18% 8% 3 7% 5% 4 5% 4 6% 7% 32%	1857
	21st to end	Day	16% 8% 3 8% 6% 5% 4 4 4 6% 37%	1881
November	1st to 10th	Day	12% 8% 3 8% 5% 4 4 3 5% 7% 42%	1681
	11th to 20th	Day	11% 11% 3 9% 7% 6% 5% 4 6% 7% 30%	1710
	21st to end	Day	18% 12% 3 6% 5% 4 3 3 4 6% 38%	1588
December	1st to 10th	Day	16% 12% 5% 8% 7% 7% 4 3 6% 6% 25%	1520
	11th to 20th	Day	13% 13% 4 9% 6% 6% 6% 5% 6% 6% 27%	1918
	21st to end	Day	19% 21% 7% 12% 5% 4 4 4 3 4 17%	2783
January	1st to 10th	Night	16% 15% 7% 9% 4 4 4 4 4 6% 28%	4428
	11th to 20th	Night	13% 14% 6% 13% 7% 5% 6% 5% 8% 5% 16%	4440
	21st to end	Night	17% 18% 6% 11% 5% 4 4 3 5% 6% 22%	4884
February	1st to 10th	Night	13% 14% 5% 8% 5% 5% 5% 4 6% 5% 31%	2466
	11th to 20th	Night	12% 11% 3 7% 5% 4 5% 4 4 6% 38%	2218
	21st to end	Night	19% 12% 3 7% 3 4 4 3 5% 6% 35%	1884
March	1st to 10th	Night	17% 9% 3 7% 3 3 4 4 4 5% 41%	3733
	11th to 20th	Night	10% 7% 2 6% 4 4 5% 4 6% 8% 45%	3722
	21st to end	Night	19% 10% 5% 11% 6% 5% 3 3 4 4 29%	3466
April	1st to 10th	Night	16% 10% 3 6% 5% 4 5% 4 5% 6% 37%	1900
	11th to 20th	Night	20% 9% 3 6% 4 4 4 3 4 5% 38%	1875
	21st to end	Night	18% 8% 3 5% 4 4 3 4 5% 7% 40%	1758
May	1st to 10th	Night	15% 8% 3 7% 5% 5% 4 4 6% 7% 36%	2813
	11th to 20th	Night	15% 6% 3 7% 4 5% 5% 5% 7% 8% 35%	2511
	21st to end	Night	13% 7% 3 7% 5% 4 4 3 5% 6% 42%	2743
June	1st to 10th	Night	11% 4 2 5% 5% 4 6% 5% 5% 7% 46%	1520
	11th to 20th	Night	12% 6% 3 5% 4 3 4 4 6% 9% 43%	1520
	21st to end	Night	9% 7% 3 6% 5% 4 4 3 5% 8% 46%	1520
July	1st to 10th	Night	13% 7% 2 6% 5% 5% 4 4 7% 7% 41%	2530
	11th to 20th	Night	4 3 1 4 5% 4 4 4 7% 8% 56%	2530
	21st to end	Night	6% 4 2 6% 4 5% 5% 4 7% 9% 49%	2750
August	1st to 10th	Night	10% 5% 2 5% 4 3 4 4 6% 10% 48%	2542
	11th to 20th	Night	9% 5% 2 6% 4 4 4 4 6% 8% 49%	2977
	21st to end	Night	8% 4 2 5% 4 4 4 4 6% 9% 49%	3476
September	1st to 10th	Night	9% 4 2 6% 4 4 4 3 5% 7% 52%	1900
	11th to 20th	Night	11% 4 1 5% 4 3 4 3 5% 7% 53%	2001
	21st to end	Night	13% 7% 3 7% 4 4 3 3 5% 7% 46%	2090
October	1st to 10th	Night	14% 6% 2 6% 3 4 4 2 5% 6% 47%	2145
	11th to 20th	Night	18% 7% 2 6% 4 3 3 3 5% 6% 42%	2322
	21st to end	Night	19% 9% 3 7% 4 4 4 3 5% 7% 34%	2717
November	1st to 10th	Night	11% 8% 3 6% 5% 3 4 3 4 7% 46%	2431
	11th to 20th	Night	14% 11% 3 8% 5% 4 6% 4 5% 6% 34%	2470
	21st to end	Night	17% 10% 3 5% 5% 5% 5% 3 5% 6% 36%	2588
December	1st to 10th	Night	16% 13% 3 9% 5% 5% 6% 4 5% 6% 27%	2660
	11th to 20th	Night	15% 15% 5% 8% 5% 5% 5% 4 5% 6% 27%	3279
	21st to end	Night	22% 18% 4 10% 5% 5% 4 3 4 6% 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	59% 2 15% 18% 6%	2528
	11th to 20th	Day	61% 2 13% 21% 3	2530
	21st to end	Day	67% 2 9% 18% 4	2783
February	1st to 10th	Day	55% 4 12% 20% 8% 1	1708
	11th to 20th	Day	49% 2 11% 24% 11% 2	1858
	21st to end	Day	54% 3 11% 20% 11% 2	1570
March	1st to 10th	Day	44% 2 12% 27% 11% 3	3120
	11th to 20th	Day	44% 2 9% 27% 15% 2	3264
	21st to end	Day	58% 2 12% 18% 8% 1	4165
April	1st to 10th	Day	52% 4 11% 21% 11% 1	2280
	11th to 20th	Day	49% 4 9% 22% 13% 3	2254
	21st to end	Day	49% 4 13% 20% 12% 2	2422
May	1st to 10th	Day	48% 3 8% 25% 16% 1	4120
	11th to 20th	Day	44% 2 11% 28% 14% 1	4393
	21st to end	Day	40% 3 11% 24% 18% 4	4837
June	1st to 10th	Day	38% 3 12% 27% 17% 3	2660
	11th to 20th	Day	38% 3 14% 25% 19% 1	2660
	21st to end	Day	36% 5% 16% 26% 17% 2	2660
July	1st to 10th	Day	44% 3 12% 28% 12% 2	4371
	11th to 20th	Day	28% 3 17% 35% 16% 1	4365
	21st to end	Day	33% 4 16% 24% 19% 4	4662
August	1st to 10th	Day	37% 3 16% 31% 12% 1	4381
	11th to 20th	Day	33% 3 14% 37% 12% 1	3874
	21st to end	Day	37% 3 14% 26% 19% 2	4179
September	1st to 10th	Day	36% 5% 11% 31% 15% 2	2280
	11th to 20th	Day	33% 3 11% 35% 16% 1	2159
	21st to end	Day	40% 3 11% 32% 13% 1	2090
October	1st to 10th	Day	38% 3 10% 33% 15% 1	2032
	11th to 20th	Day	51% 4 12% 21% 11% 1	1857
	21st to end	Day	49% 4 11% 25% 11% 1	1881
November	1st to 10th	Day	43% 3 12% 27% 13% 1	1681
	11th to 20th	Day	53% 4 14% 22% 7%	1710
	21st to end	Day	50% 3 15% 25% 7%	1588
December	1st to 10th	Day	59% 2 15% 16% 7% 1	1520
	11th to 20th	Day	57% 2 15% 18% 6% 2	1915
	21st to end	Day	74% 2 7% 13% 4	2783
January	1st to 10th	Night	60% 1 10% 20% 9% 1	4428
	11th to 20th	Night	67% 2 9% 16% 6%	4440
	21st to end	Night	65% 2 10% 18% 5%	4884
February	1st to 10th	Night	54% 3 10% 20% 11% 1	2466
	11th to 20th	Night	48% 3 10% 24% 14% 1	2219
	21st to end	Night	51% 2 11% 21% 13% 2	1884
March	1st to 10th	Night	47% 2 12% 27% 8% 3	3733
	11th to 20th	Night	38% 2 11% 27% 19% 3	3722
	21st to end	Night	61% 2 8% 17% 11% 2	3466
April	1st to 10th	Night	48% 3 8% 22% 17% 1	1900
	11th to 20th	Night	49% 3 5% 21% 18% 4	1875
	21st to end	Night	44% 3 11% 25% 15% 2	1758
May	1st to 10th	Night	48% 2 10% 21% 17% 2	2840
	11th to 20th	Night	47% 2 9% 27% 13% 1	2512
	21st to end	Night	44% 2 10% 19% 17% 8%	2751
June	1st to 10th	Night	37% 4 11% 29% 18% 2	1520
	11th to 20th	Night	38% 3 9% 26% 22% 3	1520
	21st to end	Night	37% 4 14% 24% 18% 2	1520
July	1st to 10th	Night	43% 3 14% 24% 12% 5%	2490
	11th to 20th	Night	27% 3 14% 37% 17% 3	2482
	21st to end	Night	32% 3 15% 22% 25% 3	2662
August	1st to 10th	Night	33% 3 15% 28% 19% 2	2533
	11th to 20th	Night	34% 2 11% 34% 17% 1	3004
	21st to end	Night	32% 3 12% 28% 21% 3	3476
September	1st to 10th	Night	32% 4 10% 28% 23% 2	1900
	11th to 20th	Night	32% 2 9% 37% 18% 2	2001
	21st to end	Night	41% 2 8% 32% 15% 1	2090
October	1st to 10th	Night	38% 3 9% 32% 17% 1	2145
	11th to 20th	Night	44% 3 13% 23% 16% 1	2322
	21st to end	Night	50% 3 12% 22% 12% 1	2717
November	1st to 10th	Night	41% 3 10% 28% 17% 2	2431
	11th to 20th	Night	50% 3 13% 22% 11% 1	2470
	21st to end	Night	49% 3 15% 24% 8% 1	2588
December	1st to 10th	Night	58% 2 11% 21% 7% 1	2660
	11th to 20th	Night	59% 2 12% 18% 9% 1	3281
	21st to end	Night	69% 2 9% 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	19% 10% 33% 27% 10% 1	270
	11th to 20th	Day	19% 11% 33% 26% 11% 1	270
	21st to end	Day	22% 6% 31% 31% 8% 2	297
February	1st to 10th	Day	13% 12% 40% 25% 8% 1	270
	11th to 20th	Day	16% 14% 36% 25% 8% 1	270
	21st to end	Day	19% 11% 43% 24% 4	225
March	1st to 10th	Day	13% 13% 46% 24% 5%	270
	11th to 20th	Day	16% 13% 35% 24% 10% 2	298
	21st to end	Day	26% 9% 30% 26% 8% 1	506
April	1st to 10th	Day	24% 8% 35% 25% 8%	460
	11th to 20th	Day	18% 10% 35% 25% 9% 4	452
	21st to end	Day	22% 7% 29% 27% 13% 2	460
May	1st to 10th	Day	21% 5% 33% 32% 7% 2	463
	11th to 20th	Day	18% 5% 26% 34% 15% 2	665
	21st to end	Day	14% 4 23% 28% 22% 7%	734
June	1st to 10th	Day	9% 4 23% 39% 20% 4	680
	11th to 20th	Day	13% 3 20% 40% 19% 4	680
	21st to end	Day	11% 3 19% 40% 24% 4	680
July	1st to 10th	Day	8% 2 12% 37% 32% 10%	671
	11th to 20th	Day	7% 2 18% 37% 28% 8%	668
	21st to end	Day	5% 2 17% 41% 29% 6%	739
August	1st to 10th	Day	10% 2 12% 37% 32% 8%	662
	11th to 20th	Day	10% 2 15% 31% 30% 11%	479
	21st to end	Day	9% 3 14% 36% 29% 9%	539
September	1st to 10th	Day	12% 3 17% 34% 25% 9%	490
	11th to 20th	Day	11% 3 15% 31% 29% 12%	490
	21st to end	Day	15% 7% 23% 27% 21% 7%	490
October	1st to 10th	Day	18% 6% 25% 26% 21% 4	432
	11th to 20th	Day	21% 10% 28% 27% 13% 2	300
	21st to end	Day	20% 8% 34% 28% 8% 2	330
November	1st to 10th	Day	14% 12% 30% 27% 14% 2	273
	11th to 20th	Day	15% 16% 36% 24% 10%	270
	21st to end	Day	26% 9% 37% 21% 8%	270
December	1st to 10th	Day	23% 11% 37% 20% 10%	270
	11th to 20th	Day	24% 11% 36% 20% 7% 1	270
	21st to end	Day	25% 14% 37% 20% 3 1	297
January	1st to 10th	Night	20% 13% 37% 22% 7%	950
	11th to 20th	Night	23% 12% 36% 23% 6% 1	950
	21st to end	Night	21% 10% 36% 26% 7%	1045
February	1st to 10th	Night	21% 10% 35% 27% 7% 1	941
	11th to 20th	Night	20% 10% 37% 27% 6%	743
	21st to end	Night	26% 10% 35% 24% 4	628
March	1st to 10th	Night	18% 9% 32% 29% 12% 1	760
	11th to 20th	Night	15% 9% 34% 31% 10% 1	751
	21st to end	Night	23% 6% 25% 34% 10% 2	627
April	1st to 10th	Night	21% 7% 30% 31% 10% 1	570
	11th to 20th	Night	25% 5% 28% 27% 12% 3	563
	21st to end	Night	22% 4 22% 35% 16% 2	570
May	1st to 10th	Night	17% 4 21% 40% 15% 2	570
	11th to 20th	Night	21% 3 20% 33% 20% 2	561
	21st to end	Night	13% 2 17% 34% 26% 7%	617
June	1st to 10th	Night	13% 2 15% 38% 27% 5%	570
	11th to 20th	Night	15% 2 16% 36% 25% 5%	570
	21st to end	Night	10% 2 16% 38% 31% 3	570
July	1st to 10th	Night	10% 1 6% 33% 39% 10%	555
	11th to 20th	Night	8% 2 13% 36% 33% 9%	552
	21st to end	Night	8% 1 13% 39% 34% 5%	624
August	1st to 10th	Night	7% 2 10% 37% 36% 8%	567
	11th to 20th	Night	10% 2 12% 32% 32% 11%	564
	21st to end	Night	11% 2 13% 34% 35% 5%	627
September	1st to 10th	Night	11% 2 15% 34% 29% 9%	570
	11th to 20th	Night	12% 4 15% 28% 31% 11%	671
	21st to end	Night	18% 6% 19% 24% 24% 8%	760
October	1st to 10th	Night	18% 5% 24% 26% 24% 4	760
	11th to 20th	Night	22% 8% 31% 26% 12% 1	760
	21st to end	Night	27% 8% 28% 26% 10% 1	836
November	1st to 10th	Night	17% 9% 33% 28% 11% 2	748
	11th to 20th	Night	20% 15% 35% 22% 8%	760
	21st to end	Night	22% 12% 35% 24% 7%	878
December	1st to 10th	Night	25% 13% 35% 21% 5%	950
	11th to 20th	Night	25% 11% 35% 21% 7%	950
	21st to end	Night	30% 13% 33% 21% 4	1045

Page generated at 2024-10-30 12:19:24. Version ac07

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