Muscatine
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Muscatine clear sky chart from 2005-11-06 to 2024-11-25.

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% 8% 3 7% 5% 4 4 4 5% 7% 39%	101635
	Night	13% 9% 3 7% 4 4 4 3 5% 6% 41%	97920
Transparency	Day	24% 46% 7% 13% 9% 1	105228
	Night	24% 46% 6% 13% 9% 1	102466
Seeing	Day	16% 9% 28% 27% 15% 5%	15882
	Night	17% 8% 30% 31% 12% 1	25732

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% 11% 6% 16% 8% 6% 4 4 6% 5% 24%	2527
	11th to 20th	Day	11% 11% 4 14% 10% 6% 6% 5% 8% 4 22%	2592
	21st to end	Day	17% 20% 9% 12% 6% 4 3 2 4 4 19%	3135
February	1st to 10th	Day	14% 13% 4 9% 6% 5% 5% 4 4 7% 30%	1710
	11th to 20th	Day	14% 10% 4 7% 5% 6% 4 3 4 7% 36%	1733
	21st to end	Day	13% 12% 4 10% 6% 4 3 3 5% 6% 34%	1570
March	1st to 10th	Day	15% 12% 4 7% 4 3 3 2 4 5% 41%	3202
	11th to 20th	Day	9% 7% 3 6% 4 4 5% 4 5% 6% 47%	3480
	21st to end	Day	22% 12% 4 10% 5% 4 4 3 5% 6% 25%	3991
April	1st to 10th	Day	17% 12% 4 8% 4 4 3 4 4 6% 34%	2280
	11th to 20th	Day	17% 9% 3 6% 5% 4 4 3 6% 6% 37%	2254
	21st to end	Day	21% 8% 3 6% 5% 5% 4 3 5% 6% 34%	2280
May	1st to 10th	Day	16% 7% 2 8% 5% 5% 4 4 5% 8% 36%	4178
	11th to 20th	Day	16% 7% 3 6% 5% 4 4 3 5% 7% 41%	4399
	21st to end	Day	13% 6% 2 5% 4 4 4 4 6% 8% 44%	4824
June	1st to 10th	Day	9% 5% 2 6% 5% 5% 5% 4 7% 9% 45%	2660
	11th to 20th	Day	9% 5% 2 6% 4 5% 4 4 5% 8% 46%	2660
	21st to end	Day	11% 6% 2 6% 4 5% 5% 4 7% 8% 41%	2660
July	1st to 10th	Day	9% 8% 3 7% 5% 6% 6% 5% 6% 9% 36%	4440
	11th to 20th	Day	6% 4 2 4 4 4 4 4 5% 9% 53%	4440
	21st to end	Day	7% 4 2 6% 5% 5% 6% 5% 7% 11% 41%	4734
August	1st to 10th	Day	7% 4 2 6% 4 5% 5% 4 8% 10% 45%	4104
	11th to 20th	Day	11% 5% 2 6% 4 4 5% 4 7% 9% 42%	3891
	21st to end	Day	7% 5% 2 5% 4 4 4 4 6% 9% 51%	4180
September	1st to 10th	Day	12% 4 1 5% 4 4 4 4 4 8% 49%	2280
	11th to 20th	Day	9% 4 2 4 3 3 4 4 5% 7% 54%	2280
	21st to end	Day	10% 5% 3 6% 3 4 5% 4 5% 8% 48%	2030
October	1st to 10th	Day	13% 6% 2 5% 3 3 3 3 4 6% 50%	1900
	11th to 20th	Day	15% 8% 3 7% 4 3 3 3 4 6% 44%	1900
	21st to end	Day	20% 8% 2 6% 4 3 3 3 5% 5% 42%	2035
November	1st to 10th	Day	11% 9% 3 6% 4 4 4 4 5% 6% 45%	1762
	11th to 20th	Day	15% 11% 3 7% 4 4 4 3 4 8% 36%	1751
	21st to end	Day	16% 12% 3 7% 3 4 4 3 4 7% 38%	1552
December	1st to 10th	Day	15% 13% 4 10% 4 4 4 3 5% 5% 33%	1520
	11th to 20th	Day	13% 11% 4 7% 6% 5% 5% 3 6% 6% 33%	1918
	21st to end	Day	23% 20% 7% 11% 4 4 4 3 3 4 17%	2783
January	1st to 10th	Night	13% 11% 8% 14% 5% 5% 4 3 4 4 29%	4428
	11th to 20th	Night	13% 16% 7% 11% 5% 5% 4 4 7% 5% 23%	4376
	21st to end	Night	18% 16% 6% 12% 5% 4 4 3 4 6% 22%	4532
February	1st to 10th	Night	15% 12% 4 7% 7% 4 3 4 5% 7% 33%	2470
	11th to 20th	Night	13% 10% 3 7% 5% 4 4 3 5% 6% 40%	2332
	21st to end	Night	15% 11% 3 8% 5% 4 3 3 4 4 40%	1884
March	1st to 10th	Night	17% 9% 3 6% 4 4 3 3 4 5% 41%	3679
	11th to 20th	Night	11% 6% 2 6% 4 3 4 3 4 7% 50%	3480
	21st to end	Night	23% 12% 5% 10% 5% 5% 4 4 4 4 23%	3638
April	1st to 10th	Night	16% 10% 3 6% 4 3 3 3 5% 6% 41%	1900
	11th to 20th	Night	17% 8% 3 6% 4 4 4 3 4 5% 43%	1875
	21st to end	Night	17% 7% 3 7% 4 4 4 4 6% 7% 38%	1900
May	1st to 10th	Night	20% 7% 3 7% 5% 4 4 3 5% 7% 37%	2706
	11th to 20th	Night	13% 5% 2 6% 5% 5% 5% 3 6% 6% 43%	2506
	21st to end	Night	8% 5% 2 5% 4 4 5% 4 6% 8% 49%	2743
June	1st to 10th	Night	8% 6% 2 6% 4 3 5% 4 6% 8% 49%	1520
	11th to 20th	Night	8% 4 2 6% 4 4 5% 5% 6% 9% 46%	1520
	21st to end	Night	10% 5% 2 6% 4 5% 3 4 7% 8% 47%	1520
July	1st to 10th	Night	13% 5% 2 7% 5% 4 5% 4 7% 8% 40%	2530
	11th to 20th	Night	5% 3 1 3 4 3 4 4 5% 8% 60%	2530
	21st to end	Night	6% 4 2 5% 4 5% 5% 4 7% 9% 48%	2825
August	1st to 10th	Night	5% 4 1 5% 4 4 4 4 6% 9% 55%	2836
	11th to 20th	Night	7% 4 2 5% 4 4 4 3 5% 8% 55%	2942
	21st to end	Night	7% 3 2 5% 4 4 4 4 5% 8% 55%	3476
September	1st to 10th	Night	11% 4 1 5% 3 3 3 3 4 6% 57%	1900
	11th to 20th	Night	10% 5% 2 5% 3 4 4 3 5% 7% 52%	1900
	21st to end	Night	7% 5% 2 5% 3 4 5% 3 5% 8% 52%	2125
October	1st to 10th	Night	11% 5% 3 5% 4 3 3 2 5% 5% 54%	2280
	11th to 20th	Night	14% 6% 2 5% 4 4 3 2 5% 6% 49%	2280
	21st to end	Night	18% 8% 3 7% 4 4 3 3 5% 5% 41%	2560
November	1st to 10th	Night	12% 7% 2 4 3 3 3 3 5% 6% 52%	2536
	11th to 20th	Night	14% 9% 3 7% 5% 3 4 3 5% 6% 40%	2645
	21st to end	Night	17% 11% 3 7% 4 3 4 3 5% 6% 39%	2723
December	1st to 10th	Night	13% 13% 4 8% 5% 4 4 4 4 6% 36%	2660
	11th to 20th	Night	14% 11% 4 8% 6% 4 4 3 5% 6% 35%	3279
	21st to end	Night	21% 17% 7% 11% 5% 4 4 3 4 4 20%	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	43% 36% 7% 11% 3	2528
	11th to 20th	Day	41% 37% 7% 10% 6%	2592
	21st to end	Day	48% 38% 5% 6% 3	3135
February	1st to 10th	Day	19% 65% 4 6% 5%	1710
	11th to 20th	Day	17% 64% 4 9% 5% 1	1742
	21st to end	Day	17% 65% 4 9% 4 2	1570
March	1st to 10th	Day	28% 40% 6% 13% 11% 2	3202
	11th to 20th	Day	19% 40% 7% 20% 14% 1	3480
	21st to end	Day	38% 39% 11% 10% 2	3991
April	1st to 10th	Day	21% 65% 4 7% 3	2280
	11th to 20th	Day	17% 65% 4 8% 4 1	2254
	21st to end	Day	18% 65% 3 6% 6% 1	2280
May	1st to 10th	Day	28% 40% 7% 13% 12%	4214
	11th to 20th	Day	27% 40% 7% 20% 6%	4403
	21st to end	Day	21% 40% 6% 18% 15% 1	4837
June	1st to 10th	Day	8% 66% 6% 10% 8% 2	2660
	11th to 20th	Day	13% 66% 6% 8% 7% 1	2660
	21st to end	Day	14% 65% 7% 9% 4 1	2660
July	1st to 10th	Day	32% 38% 7% 15% 7% 1	4371
	11th to 20th	Day	17% 37% 11% 23% 12%	4365
	21st to end	Day	22% 39% 14% 12% 12% 1	4585
August	1st to 10th	Day	20% 38% 14% 20% 8%	4090
	11th to 20th	Day	26% 38% 10% 17% 8%	3930
	21st to end	Day	22% 40% 9% 20% 9% 1	4179
September	1st to 10th	Day	14% 60% 4 10% 10% 1	2280
	11th to 20th	Day	10% 60% 5% 14% 7% 3	2280
	21st to end	Day	16% 60% 5% 12% 7% 1	2030
October	1st to 10th	Day	12% 36% 2 18% 30% 1	3160
	11th to 20th	Day	12% 36% 7% 14% 26% 4	3140
	21st to end	Day	25% 37% 5% 20% 12% 2	3337
November	1st to 10th	Day	20% 57% 6% 9% 6% 1	1762
	11th to 20th	Day	19% 56% 5% 10% 8% 1	1751
	21st to end	Day	23% 59% 5% 9% 3	1552
December	1st to 10th	Day	22% 59% 6% 7% 4 1	1520
	11th to 20th	Day	24% 48% 6% 14% 6% 2	1915
	21st to end	Day	52% 37% 4 5% 2	2783
January	1st to 10th	Night	42% 36% 6% 11% 5%	4428
	11th to 20th	Night	41% 37% 7% 8% 7% 1	4376
	21st to end	Night	43% 39% 6% 9% 3	4532
February	1st to 10th	Night	18% 65% 5% 8% 5%	2470
	11th to 20th	Night	17% 64% 4 9% 6%	2333
	21st to end	Night	15% 64% 2 9% 7% 2	1884
March	1st to 10th	Night	30% 40% 4 14% 11% 1	3679
	11th to 20th	Night	18% 40% 5% 23% 12% 2	3480
	21st to end	Night	41% 40% 8% 8% 3	3638
April	1st to 10th	Night	18% 65% 3 10% 3 1	1900
	11th to 20th	Night	15% 66% 4 9% 5% 1	1875
	21st to end	Night	16% 65% 3 7% 7% 2	1900
May	1st to 10th	Night	31% 41% 6% 10% 11% 1	2734
	11th to 20th	Night	24% 40% 11% 19% 6%	2507
	21st to end	Night	18% 39% 6% 20% 16% 1	2751
June	1st to 10th	Night	10% 66% 6% 9% 7% 2	1520
	11th to 20th	Night	12% 66% 4 11% 7% 1	1520
	21st to end	Night	13% 64% 6% 10% 6% 1	1520
July	1st to 10th	Night	32% 37% 9% 14% 7% 1	2490
	11th to 20th	Night	14% 37% 11% 24% 15%	2482
	21st to end	Night	20% 39% 14% 13% 13% 2	2735
August	1st to 10th	Night	16% 39% 12% 21% 12%	2826
	11th to 20th	Night	19% 38% 12% 21% 9% 1	2969
	21st to end	Night	20% 39% 9% 21% 9% 1	3476
September	1st to 10th	Night	12% 60% 5% 10% 12% 1	1900
	11th to 20th	Night	12% 60% 5% 12% 9% 3	1900
	21st to end	Night	14% 60% 4 10% 10% 1	2125
October	1st to 10th	Night	16% 36% 2 17% 27% 2	3800
	11th to 20th	Night	12% 36% 6% 15% 27% 5%	3779
	21st to end	Night	29% 36% 4 14% 14% 3	4208
November	1st to 10th	Night	18% 56% 6% 11% 8% 2	2536
	11th to 20th	Night	19% 57% 4 11% 9% 1	2645
	21st to end	Night	22% 58% 5% 11% 4 1	2723
December	1st to 10th	Night	21% 60% 5% 9% 5% 1	2660
	11th to 20th	Night	23% 49% 6% 16% 5% 1	3281
	21st to end	Night	48% 36% 5% 7% 3	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	22% 14% 35% 20% 8% 1	270
	11th to 20th	Day	21% 19% 40% 15% 4 1	270
	21st to end	Day	21% 17% 34% 21% 6% 1	297
February	1st to 10th	Day	24% 14% 41% 16% 5%	270
	11th to 20th	Day	23% 17% 33% 19% 6% 1	270
	21st to end	Day	22% 15% 44% 15% 3	225
March	1st to 10th	Day	17% 19% 41% 19% 3	270
	11th to 20th	Day	19% 21% 32% 19% 6% 2	270
	21st to end	Day	29% 16% 34% 15% 5% 1	397
April	1st to 10th	Day	25% 14% 35% 20% 7%	460
	11th to 20th	Day	23% 16% 27% 21% 11% 1	452
	21st to end	Day	24% 11% 35% 19% 9% 2	460
May	1st to 10th	Day	17% 10% 38% 25% 8% 2	596
	11th to 20th	Day	21% 11% 26% 25% 14% 3	675
	21st to end	Day	17% 7% 27% 27% 14% 7%	734
June	1st to 10th	Day	7% 6% 25% 33% 21% 8%	680
	11th to 20th	Day	9% 5% 29% 33% 21% 4	680
	21st to end	Day	12% 7% 30% 31% 17% 3	680
July	1st to 10th	Day	10% 4 17% 31% 23% 15%	671
	11th to 20th	Day	10% 4 19% 37% 23% 7%	668
	21st to end	Day	6% 2 19% 39% 28% 7%	739
August	1st to 10th	Day	7% 2 22% 35% 25% 9%	676
	11th to 20th	Day	10% 4 17% 34% 23% 11%	580
	21st to end	Day	8% 3 17% 35% 27% 10%	539
September	1st to 10th	Day	13% 5% 18% 33% 23% 8%	490
	11th to 20th	Day	7% 3 19% 37% 24% 10%	490
	21st to end	Day	13% 7% 26% 26% 20% 9%	424
October	1st to 10th	Day	18% 7% 24% 28% 17% 6%	300
	11th to 20th	Day	18% 19% 31% 21% 10% 1	300
	21st to end	Day	33% 11% 30% 20% 5% 1	330
November	1st to 10th	Day	16% 9% 42% 21% 8% 3	300
	11th to 20th	Day	22% 16% 30% 22% 8% 2	300
	21st to end	Day	26% 8% 37% 23% 6%	282
December	1st to 10th	Day	16% 17% 36% 22% 6% 3	270
	11th to 20th	Day	17% 16% 35% 23% 10%	270
	21st to end	Day	26% 20% 35% 17% 2	297
January	1st to 10th	Night	17% 11% 39% 25% 7% 1	950
	11th to 20th	Night	19% 12% 36% 27% 5%	950
	21st to end	Night	20% 12% 35% 28% 5%	1045
February	1st to 10th	Night	21% 10% 38% 25% 5%	950
	11th to 20th	Night	18% 13% 36% 29% 3	858
	21st to end	Night	22% 14% 39% 22% 3 1	628
March	1st to 10th	Night	20% 11% 40% 23% 5% 1	732
	11th to 20th	Night	18% 11% 34% 31% 7%	570
	21st to end	Night	26% 10% 34% 25% 4 1	627
April	1st to 10th	Night	22% 14% 37% 24% 3	570
	11th to 20th	Night	21% 13% 29% 30% 6% 1	563
	21st to end	Night	21% 8% 33% 30% 8%	570
May	1st to 10th	Night	19% 7% 36% 29% 8% 1	570
	11th to 20th	Night	19% 5% 29% 37% 10% 1	561
	21st to end	Night	11% 5% 28% 36% 19% 1	617
June	1st to 10th	Night	11% 3 22% 47% 15% 1	570
	11th to 20th	Night	9% 3 28% 42% 18%	570
	21st to end	Night	12% 4 25% 41% 18% 1	570
July	1st to 10th	Night	8% 2 12% 42% 31% 4	555
	11th to 20th	Night	5% 2 18% 44% 27% 3	552
	21st to end	Night	7% 2 16% 42% 31% 2	624
August	1st to 10th	Night	6% 2 13% 45% 31% 2	567
	11th to 20th	Night	8% 2 13% 45% 27% 5%	564
	21st to end	Night	8% 1 15% 45% 28% 3	627
September	1st to 10th	Night	12% 3 17% 39% 26% 4	570
	11th to 20th	Night	12% 2 19% 36% 26% 5%	570
	21st to end	Night	9% 6% 25% 35% 23% 2	733
October	1st to 10th	Night	14% 6% 28% 32% 19% 2	760
	11th to 20th	Night	19% 10% 29% 32% 11%	760
	21st to end	Night	23% 10% 33% 27% 7%	836
November	1st to 10th	Night	16% 8% 37% 30% 8% 1	780
	11th to 20th	Night	20% 12% 37% 25% 6%	845
	21st to end	Night	21% 12% 35% 26% 6%	973
December	1st to 10th	Night	19% 11% 38% 25% 6% 1	950
	11th to 20th	Night	23% 10% 33% 28% 6%	950
	21st to end	Night	27% 13% 32% 24% 3	1045

Page generated at 2024-11-22 07:02:27. Version ac07

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