Crex Meadows
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Crex Meadows clear sky chart from 2005-11-06 to 2024-12-24.

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 5% 4 5% 7% 36%	102279
	Night	13% 10% 4 8% 5% 4 4 3 5% 6% 37%	97888
Transparency	Day	45% 7% 14% 24% 10% 1	105849
	Night	46% 6% 12% 23% 12% 1	102458
Seeing	Day	16% 10% 31% 26% 14% 4	16220
	Night	16% 8% 31% 32% 11% 1	26182

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% 16% 8% 13% 6% 4 4 3 5% 5% 24%	2527
	11th to 20th	Day	6% 11% 5% 15% 9% 11% 9% 6% 5% 5% 18%	2530
	21st to end	Day	8% 20% 8% 13% 5% 5% 5% 4 5% 5% 21%	3037
February	1st to 10th	Day	9% 12% 4 10% 6% 5% 4 4 4 8% 34%	1710
	11th to 20th	Day	8% 12% 5% 8% 6% 5% 5% 4 6% 7% 35%	1664
	21st to end	Day	11% 12% 3 11% 6% 5% 5% 2 5% 7% 33%	1484
March	1st to 10th	Day	10% 13% 3 8% 5% 4 4 4 5% 6% 39%	3280
	11th to 20th	Day	9% 9% 3 9% 5% 5% 4 4 5% 7% 39%	3480
	21st to end	Day	20% 13% 4 9% 5% 4 5% 3 5% 5% 25%	3904
April	1st to 10th	Day	16% 11% 4 9% 5% 4 5% 4 5% 6% 33%	2280
	11th to 20th	Day	20% 12% 3 8% 4 4 4 3 5% 6% 31%	2254
	21st to end	Day	22% 10% 3 8% 5% 5% 5% 3 4 6% 30%	2466
May	1st to 10th	Day	17% 7% 2 7% 4 4 4 3 5% 7% 38%	4362
	11th to 20th	Day	15% 6% 3 6% 5% 4 5% 4 5% 6% 42%	4399
	21st to end	Day	18% 8% 3 7% 4 5% 5% 4 5% 7% 34%	4824
June	1st to 10th	Day	12% 5% 2 5% 5% 4 4 4 6% 8% 45%	2660
	11th to 20th	Day	13% 7% 2 7% 6% 5% 4 4 6% 8% 38%	2660
	21st to end	Day	11% 5% 2 6% 5% 5% 5% 5% 8% 10% 38%	2846
July	1st to 10th	Day	10% 5% 2 6% 5% 5% 5% 5% 7% 10% 39%	4512
	11th to 20th	Day	6% 4 1 5% 3 3 3 3 6% 10% 54%	4440
	21st to end	Day	8% 5% 2 5% 4 4 4 4 6% 10% 49%	4813
August	1st to 10th	Day	12% 7% 2 6% 4 4 5% 4 6% 8% 41%	4184
	11th to 20th	Day	12% 5% 2 6% 4 5% 5% 4 6% 9% 43%	4041
	21st to end	Day	13% 7% 3 7% 4 4 4 3 5% 6% 42%	4313
September	1st to 10th	Day	11% 5% 2 6% 4 4 5% 4 6% 9% 46%	2280
	11th to 20th	Day	12% 5% 2 7% 4 4 4 4 5% 7% 44%	2280
	21st to end	Day	16% 6% 2 5% 4 3 4 3 5% 8% 43%	1985
October	1st to 10th	Day	17% 8% 2 5% 4 3 4 4 6% 7% 39%	1900
	11th to 20th	Day	18% 11% 3 7% 5% 4 4 3 4 5% 36%	1900
	21st to end	Day	20% 11% 3 6% 5% 5% 4 3 4 6% 33%	2011
November	1st to 10th	Day	13% 13% 3 8% 5% 4 4 4 5% 7% 33%	1648
	11th to 20th	Day	13% 15% 6% 11% 6% 5% 4 4 5% 6% 25%	1600
	21st to end	Day	15% 13% 4 9% 5% 3 5% 3 5% 6% 32%	1600
December	1st to 10th	Day	10% 15% 6% 14% 9% 4 6% 4 4 6% 22%	1600
	11th to 20th	Day	13% 14% 7% 12% 6% 5% 4 4 5% 5% 25%	1998
	21st to end	Day	24% 17% 5% 13% 6% 5% 3 2 3 4 18%	2807
January	1st to 10th	Night	13% 12% 8% 14% 6% 4 4 3 4 5% 28%	4428
	11th to 20th	Night	6% 11% 5% 14% 9% 8% 8% 5% 6% 5% 22%	4440
	21st to end	Night	9% 23% 8% 12% 6% 4 4 3 4 5% 23%	4628
February	1st to 10th	Night	6% 11% 5% 10% 6% 5% 5% 3 5% 6% 36%	2470
	11th to 20th	Night	6% 11% 4 10% 6% 5% 4 4 6% 5% 37%	2403
	21st to end	Night	12% 12% 3 8% 6% 5% 5% 3 5% 5% 35%	1968
March	1st to 10th	Night	9% 8% 3 7% 5% 4 4 3 5% 6% 46%	3587
	11th to 20th	Night	8% 10% 3 11% 5% 5% 4 4 5% 5% 40%	3480
	21st to end	Night	23% 14% 5% 10% 4 3 3 2 4 4 29%	3726
April	1st to 10th	Night	19% 10% 3 6% 5% 4 3 3 5% 5% 36%	1900
	11th to 20th	Night	22% 10% 3 6% 4 4 3 3 4 4 36%	1875
	21st to end	Night	20% 10% 3 7% 4 4 4 4 5% 6% 33%	1710
May	1st to 10th	Night	15% 8% 3 7% 5% 4 5% 3 5% 7% 38%	2543
	11th to 20th	Night	14% 6% 2 4 3 3 4 3 5% 8% 48%	2506
	21st to end	Night	14% 8% 3 7% 5% 4 4 4 6% 7% 38%	2743
June	1st to 10th	Night	11% 5% 2 6% 5% 5% 5% 4 6% 10% 43%	1520
	11th to 20th	Night	11% 5% 2 5% 5% 5% 5% 3 7% 7% 44%	1513
	21st to end	Night	8% 6% 2 6% 4 5% 5% 4 7% 7% 46%	1330
July	1st to 10th	Night	10% 4 2 5% 4 4 4 4 7% 9% 47%	2437
	11th to 20th	Night	4 3 1 4 4 3 4 3 6% 8% 58%	2530
	21st to end	Night	6% 4 2 4 3 3 4 3 6% 7% 57%	2750
August	1st to 10th	Night	10% 5% 2 6% 4 3 3 4 5% 8% 48%	2739
	11th to 20th	Night	14% 6% 2 5% 4 3 4 3 7% 7% 45%	2798
	21st to end	Night	13% 7% 3 7% 5% 4 5% 3 6% 7% 42%	3346
September	1st to 10th	Night	9% 5% 2 5% 4 4 4 4 4 7% 53%	1900
	11th to 20th	Night	10% 5% 1 5% 4 3 4 3 5% 8% 52%	1900
	21st to end	Night	15% 5% 2 5% 4 4 4 3 4 7% 47%	2173
October	1st to 10th	Night	15% 7% 2 5% 3 3 4 3 4 7% 47%	2280
	11th to 20th	Night	16% 10% 3 7% 5% 3 4 3 4 6% 39%	2280
	21st to end	Night	18% 10% 3 7% 5% 4 4 4 5% 5% 34%	2586
November	1st to 10th	Night	15% 10% 3 7% 5% 4 5% 3 5% 7% 37%	2647
	11th to 20th	Night	15% 11% 6% 10% 5% 4 4 4 4 5% 31%	2800
	21st to end	Night	13% 10% 4 9% 6% 5% 4 4 5% 6% 35%	2800
December	1st to 10th	Night	10% 15% 5% 12% 8% 5% 5% 4 5% 7% 25%	2800
	11th to 20th	Night	12% 17% 5% 11% 7% 6% 5% 4 4 5% 24%	3419
	21st to end	Night	24% 20% 4 9% 5% 4 3 2 3 5% 21%	4933

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	61% 8% 10% 17% 4	2528
	11th to 20th	Day	64% 8% 9% 14% 5%	2530
	21st to end	Day	62% 8% 11% 15% 4	3037
February	1st to 10th	Day	50% 6% 13% 22% 9% 1	1710
	11th to 20th	Day	47% 7% 14% 24% 8% 1	1673
	21st to end	Day	52% 6% 11% 20% 11% 1	1484
March	1st to 10th	Day	45% 7% 14% 22% 11% 1	3280
	11th to 20th	Day	42% 7% 14% 27% 10% 1	3480
	21st to end	Day	59% 8% 8% 20% 5%	3904
April	1st to 10th	Day	51% 6% 12% 18% 12% 1	2280
	11th to 20th	Day	54% 5% 9% 18% 12% 1	2254
	21st to end	Day	56% 6% 10% 19% 9%	2466
May	1st to 10th	Day	43% 8% 12% 24% 12% 1	4403
	11th to 20th	Day	40% 8% 14% 24% 12% 2	4403
	21st to end	Day	47% 9% 12% 22% 10% 1	4837
June	1st to 10th	Day	35% 7% 17% 29% 11% 1	2660
	11th to 20th	Day	43% 7% 15% 22% 13% 1	2660
	21st to end	Day	37% 9% 19% 26% 9% 1	2846
July	1st to 10th	Day	38% 6% 19% 23% 13%	4443
	11th to 20th	Day	25% 6% 17% 36% 15% 1	4365
	21st to end	Day	30% 6% 17% 30% 16%	4662
August	1st to 10th	Day	38% 6% 15% 27% 12% 1	4169
	11th to 20th	Day	38% 6% 13% 34% 9%	4080
	21st to end	Day	42% 5% 16% 24% 12% 1	4312
September	1st to 10th	Day	35% 7% 15% 32% 11%	2280
	11th to 20th	Day	36% 8% 19% 29% 7%	2280
	21st to end	Day	40% 6% 14% 31% 8% 1	1985
October	1st to 10th	Day	31% 5% 10% 36% 17%	3160
	11th to 20th	Day	42% 4 9% 26% 16% 2	3140
	21st to end	Day	48% 4 16% 24% 8%	3288
November	1st to 10th	Day	50% 6% 13% 19% 11% 1	1648
	11th to 20th	Day	60% 6% 13% 14% 7% 1	1600
	21st to end	Day	53% 6% 16% 18% 5% 2	1600
December	1st to 10th	Day	63% 6% 13% 13% 4	1600
	11th to 20th	Day	59% 8% 12% 15% 4 1	1995
	21st to end	Day	71% 5% 8% 9% 7%	2807
January	1st to 10th	Night	58% 6% 12% 18% 6% 1	4428
	11th to 20th	Night	60% 8% 13% 13% 5%	4440
	21st to end	Night	63% 6% 9% 16% 5%	4628
February	1st to 10th	Night	47% 7% 12% 22% 10% 1	2470
	11th to 20th	Night	46% 7% 14% 23% 8% 1	2404
	21st to end	Night	51% 6% 13% 20% 10% 1	1968
March	1st to 10th	Night	38% 6% 14% 24% 16% 2	3587
	11th to 20th	Night	44% 7% 11% 25% 13%	3480
	21st to end	Night	60% 4 8% 17% 10%	3726
April	1st to 10th	Night	49% 7% 8% 18% 16% 2	1900
	11th to 20th	Night	51% 5% 7% 21% 14% 2	1875
	21st to end	Night	49% 7% 9% 19% 13% 1	1710
May	1st to 10th	Night	43% 8% 12% 20% 16% 1	2567
	11th to 20th	Night	33% 7% 11% 28% 19% 3	2507
	21st to end	Night	40% 10% 14% 22% 13% 1	2751
June	1st to 10th	Night	34% 9% 16% 27% 12% 2	1520
	11th to 20th	Night	36% 7% 16% 20% 20% 2	1513
	21st to end	Night	32% 10% 15% 28% 13% 3	1330
July	1st to 10th	Night	33% 6% 22% 25% 13% 1	2397
	11th to 20th	Night	23% 6% 12% 40% 17% 2	2482
	21st to end	Night	25% 6% 14% 33% 19% 2	2662
August	1st to 10th	Night	34% 5% 14% 28% 15% 3	2730
	11th to 20th	Night	37% 6% 13% 32% 11% 1	2825
	21st to end	Night	41% 5% 16% 27% 10% 1	3346
September	1st to 10th	Night	29% 8% 15% 34% 13% 1	1900
	11th to 20th	Night	30% 7% 17% 33% 13%	1900
	21st to end	Night	37% 6% 13% 31% 12% 1	2173
October	1st to 10th	Night	26% 3 8% 36% 23% 4	3800
	11th to 20th	Night	39% 5% 12% 23% 21% 1	3779
	21st to end	Night	49% 5% 12% 24% 11%	4259
November	1st to 10th	Night	46% 6% 13% 23% 11% 1	2647
	11th to 20th	Night	55% 6% 13% 17% 9%	2800
	21st to end	Night	49% 7% 16% 21% 6% 1	2800
December	1st to 10th	Night	58% 7% 15% 16% 5%	2800
	11th to 20th	Night	59% 8% 12% 16% 5% 1	3421
	21st to end	Night	67% 6% 10% 14% 4	4933

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	14% 10% 37% 26% 9% 4	270
	11th to 20th	Day	14% 10% 39% 29% 8%	270
	21st to end	Day	15% 9% 40% 20% 14% 2	297
February	1st to 10th	Day	15% 13% 43% 23% 5% 1	270
	11th to 20th	Day	13% 18% 43% 18% 6% 3	270
	21st to end	Day	16% 14% 44% 22% 3	225
March	1st to 10th	Day	19% 15% 36% 20% 9% 1	270
	11th to 20th	Day	17% 12% 39% 22% 8% 2	270
	21st to end	Day	25% 13% 30% 20% 10% 2	349
April	1st to 10th	Day	22% 15% 35% 21% 7%	460
	11th to 20th	Day	26% 11% 29% 23% 10% 1	452
	21st to end	Day	26% 11% 31% 20% 10% 2	646
May	1st to 10th	Day	19% 16% 30% 25% 9% 2	653
	11th to 20th	Day	18% 12% 28% 27% 12% 4	675
	21st to end	Day	18% 11% 26% 24% 17% 4	734
June	1st to 10th	Day	11% 7% 29% 31% 18% 5%	680
	11th to 20th	Day	12% 9% 36% 29% 11% 2	680
	21st to end	Day	13% 7% 30% 28% 16% 6%	680
July	1st to 10th	Day	9% 4 21% 31% 25% 11%	671
	11th to 20th	Day	9% 6% 27% 27% 21% 11%	668
	21st to end	Day	7% 3 26% 34% 22% 8%	739
August	1st to 10th	Day	10% 5% 23% 33% 23% 6%	676
	11th to 20th	Day	14% 6% 18% 31% 23% 7%	665
	21st to end	Day	12% 7% 24% 31% 22% 5%	620
September	1st to 10th	Day	12% 6% 28% 33% 17% 5%	490
	11th to 20th	Day	12% 6% 28% 30% 20% 4	490
	21st to end	Day	22% 10% 29% 18% 16% 6%	314
October	1st to 10th	Day	18% 11% 31% 19% 14% 7%	300
	11th to 20th	Day	19% 18% 32% 25% 5% 1	300
	21st to end	Day	24% 14% 39% 15% 7% 1	330
November	1st to 10th	Day	22% 12% 36% 20% 9% 2	300
	11th to 20th	Day	19% 18% 37% 19% 6%	300
	21st to end	Day	23% 12% 37% 24% 5%	300
December	1st to 10th	Day	15% 12% 39% 24% 10%	300
	11th to 20th	Day	22% 15% 37% 21% 6%	300
	21st to end	Day	26% 12% 37% 21% 2	306
January	1st to 10th	Night	13% 11% 35% 31% 9% 1	950
	11th to 20th	Night	17% 7% 38% 29% 8% 1	950
	21st to end	Night	17% 8% 36% 31% 7% 1	1045
February	1st to 10th	Night	12% 9% 40% 30% 8%	950
	11th to 20th	Night	10% 11% 40% 30% 8% 1	929
	21st to end	Night	18% 10% 34% 29% 8% 1	712
March	1st to 10th	Night	16% 11% 35% 29% 8% 1	679
	11th to 20th	Night	18% 8% 40% 28% 6%	570
	21st to end	Night	21% 11% 28% 27% 10% 2	627
April	1st to 10th	Night	22% 11% 33% 28% 6%	570
	11th to 20th	Night	26% 9% 29% 27% 8% 1	563
	21st to end	Night	24% 7% 29% 31% 8% 1	570
May	1st to 10th	Night	18% 11% 33% 31% 6% 1	570
	11th to 20th	Night	16% 7% 32% 32% 11% 2	561
	21st to end	Night	15% 6% 27% 37% 14%	617
June	1st to 10th	Night	11% 5% 30% 41% 12% 1	570
	11th to 20th	Night	12% 4 31% 43% 10%	570
	21st to end	Night	10% 5% 23% 42% 18% 1	570
July	1st to 10th	Night	6% 3 21% 42% 27% 2	555
	11th to 20th	Night	7% 3 27% 41% 21% 1	552
	21st to end	Night	6% 3 19% 46% 24% 2	624
August	1st to 10th	Night	7% 3 15% 53% 21% 1	567
	11th to 20th	Night	13% 4 18% 36% 26% 2	564
	21st to end	Night	13% 4 20% 38% 23% 2	627
September	1st to 10th	Night	9% 4 24% 40% 19% 3	570
	11th to 20th	Night	11% 4 27% 38% 17% 2	570
	21st to end	Night	15% 8% 32% 27% 17% 1	670
October	1st to 10th	Night	20% 8% 27% 31% 12% 2	760
	11th to 20th	Night	19% 11% 34% 29% 6%	760
	21st to end	Night	24% 9% 29% 30% 8%	836
November	1st to 10th	Night	20% 9% 34% 30% 7%	891
	11th to 20th	Night	20% 12% 32% 28% 8%	1000
	21st to end	Night	18% 12% 37% 26% 7%	1000
December	1st to 10th	Night	17% 11% 32% 31% 8% 1	1000
	11th to 20th	Night	20% 9% 36% 25% 9% 1	1000
	21st to end	Night	26% 9% 34% 25% 6% 1	1063

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