Poplar Bluff
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Poplar Bluff clear sky chart from 2005-11-06 to 2026-04-17.

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% 6% 2 6% 4 4 4 4 6% 7% 46%	131355
	Night	13% 6% 2 5% 4 4 4 3 5% 7% 48%	131032
Transparency	Day	36% 6% 11% 26% 18% 4	134951
	Night	35% 5% 10% 25% 20% 5%	135514
Seeing	Day	15% 9% 25% 26% 18% 7%	17361
	Night	16% 7% 26% 32% 17% 2	27276

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	15% 7% 2 6% 3 4 4 3 5% 6% 45%	4769
	11th to 20th	Day	9% 6% 2 6% 4 3 3 3 4 5% 55%	5310
	21st to end	Day	18% 6% 2 5% 4 3 3 3 4 5% 47%	5812
February	1st to 10th	Day	18% 8% 3 6% 4 4 4 4 4 6% 40%	1933
	11th to 20th	Day	17% 9% 3 6% 4 4 4 3 5% 6% 42%	2048
	21st to end	Day	17% 8% 3 6% 4 4 4 3 5% 6% 39%	1730
March	1st to 10th	Day	19% 8% 3 7% 4 4 4 3 5% 5% 40%	4688
	11th to 20th	Day	11% 6% 2 4 3 3 3 2 5% 6% 54%	5090
	21st to end	Day	15% 6% 2 6% 4 4 4 4 6% 8% 43%	5880
April	1st to 10th	Day	13% 6% 2 6% 3 4 3 3 6% 7% 46%	2520
	11th to 20th	Day	15% 6% 3 6% 5% 4 4 3 6% 6% 42%	2446
	21st to end	Day	17% 6% 2 6% 4 4 5% 3 6% 7% 40%	2400
May	1st to 10th	Day	13% 7% 3 8% 6% 5% 6% 5% 8% 10% 30%	5405
	11th to 20th	Day	15% 6% 2 7% 5% 5% 6% 5% 8% 8% 33%	5965
	21st to end	Day	17% 6% 3 5% 4 3 4 4 6% 8% 39%	6935
June	1st to 10th	Day	8% 5% 2 6% 4 5% 5% 4 7% 8% 46%	2800
	11th to 20th	Day	5% 3 1 5% 5% 4 5% 4 7% 10% 50%	2800
	21st to end	Day	5% 3 1 4 4 5% 6% 5% 7% 10% 49%	2800
July	1st to 10th	Day	7% 4 2 6% 4 5% 6% 4 7% 9% 45%	6360
	11th to 20th	Day	4 3 1 5% 3 4 5% 4 7% 11% 51%	6235
	21st to end	Day	7% 5% 2 7% 4 5% 5% 4 6% 9% 44%	6422
August	1st to 10th	Day	3 2 1 4 3 3 4 4 6% 10% 60%	4106
	11th to 20th	Day	9% 5% 2 5% 4 4 6% 4 6% 8% 46%	3849
	21st to end	Day	5% 4 1 4 3 3 4 4 5% 9% 59%	4312
September	1st to 10th	Day	9% 5% 1 5% 4 4 4 5% 7% 8% 49%	2400
	11th to 20th	Day	11% 5% 2 5% 4 4 4 3 7% 7% 49%	2368
	21st to end	Day	12% 6% 2 4 3 3 3 3 5% 6% 53%	2200
October	1st to 10th	Day	9% 3 1 5% 3 4 3 3 4 6% 59%	2013
	11th to 20th	Day	12% 6% 2 4 4 3 3 2 5% 4 56%	2000
	21st to end	Day	20% 5% 2 5% 3 2 3 3 4 6% 48%	2200
November	1st to 10th	Day	11% 5% 3 4 3 2 4 2 5% 6% 54%	1886
	11th to 20th	Day	14% 7% 2 5% 4 3 3 3 4 6% 50%	1890
	21st to end	Day	20% 7% 1 5% 3 3 3 3 3 5% 47%	1890
December	1st to 10th	Day	12% 6% 2 5% 4 4 4 3 4 5% 51%	2735
	11th to 20th	Day	17% 6% 2 6% 4 4 3 3 4 6% 45%	3088
	21st to end	Day	23% 9% 3 7% 5% 4 4 3 4 5% 31%	4070
January	1st to 10th	Night	17% 7% 2 6% 3 3 3 3 5% 6% 44%	8137
	11th to 20th	Night	11% 6% 2 5% 4 3 3 3 4 5% 54%	7680
	21st to end	Night	19% 7% 2 5% 3 3 3 3 4 5% 44%	8402
February	1st to 10th	Night	18% 9% 2 6% 4 3 3 3 4 5% 42%	2684
	11th to 20th	Night	19% 6% 2 6% 4 3 3 2 4 6% 45%	2458
	21st to end	Night	18% 6% 2 5% 4 3 3 3 5% 6% 45%	2076
March	1st to 10th	Night	17% 8% 3 7% 4 4 4 3 5% 4 41%	5428
	11th to 20th	Night	12% 6% 2 7% 4 4 4 3 5% 6% 49%	5090
	21st to end	Night	12% 5% 2 6% 5% 5% 4 4 6% 7% 44%	5289
April	1st to 10th	Night	12% 6% 1 5% 4 3 4 4 5% 8% 49%	2100
	11th to 20th	Night	14% 5% 2 5% 4 4 4 3 6% 8% 46%	2035
	21st to end	Night	18% 5% 2 6% 5% 3 4 4 5% 7% 40%	2000
May	1st to 10th	Night	17% 7% 3 6% 4 3 5% 4 6% 7% 38%	4490
	11th to 20th	Night	15% 8% 3 7% 4 4 4 3 5% 6% 39%	3914
	21st to end	Night	17% 8% 3 6% 4 4 5% 3 6% 6% 38%	3942
June	1st to 10th	Night	8% 5% 2 5% 4 4 5% 4 8% 8% 47%	1600
	11th to 20th	Night	4 3 2 4 4 3 5% 3 6% 11% 57%	1600
	21st to end	Night	3 3 1 4 3 4 4 4 6% 12% 55%	1600
July	1st to 10th	Night	8% 4 2 6% 4 4 5% 4 6% 9% 47%	3618
	11th to 20th	Night	3 3 1 5% 4 5% 5% 4 6% 10% 52%	3724
	21st to end	Night	7% 5% 2 5% 4 4 5% 5% 7% 9% 47%	4449
August	1st to 10th	Night	3 2 1 4 3 4 3 4 6% 9% 61%	3048
	11th to 20th	Night	6% 3 2 5% 4 4 4 4 6% 9% 52%	3200
	21st to end	Night	4 3 1 4 3 3 4 4 7% 9% 58%	3586
September	1st to 10th	Night	9% 4 1 4 2 4 3 3 6% 8% 55%	2000
	11th to 20th	Night	9% 5% 2 5% 4 5% 4 4 4 6% 52%	2010
	21st to end	Night	10% 4 2 5% 4 3 3 3 4 6% 57%	2200
October	1st to 10th	Night	7% 4 1 4 3 2 3 3 4 6% 63%	2382
	11th to 20th	Night	13% 5% 1 4 3 2 2 2 4 4 59%	2400
	21st to end	Night	19% 6% 2 5% 3 3 2 2 4 5% 50%	2640
November	1st to 10th	Night	13% 5% 1 4 3 2 3 2 4 6% 58%	2631
	11th to 20th	Night	13% 5% 1 4 2 3 3 3 5% 6% 54%	2730
	21st to end	Night	18% 5% 2 5% 3 3 3 3 5% 6% 48%	2730
December	1st to 10th	Night	14% 7% 2 5% 3 3 3 3 5% 6% 50%	4670
	11th to 20th	Night	18% 7% 2 5% 4 3 3 2 4 6% 46%	5339
	21st to end	Night	25% 8% 3 6% 4 4 3 3 5% 5% 34%	7150

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	40% 3 13% 29% 12% 2	4770
	11th to 20th	Day	32% 4 6% 32% 21% 6%	5310
	21st to end	Day	41% 3 9% 21% 18% 8%	5812
February	1st to 10th	Day	46% 4 13% 21% 15% 1	1933
	11th to 20th	Day	45% 3 11% 22% 15% 4	2058
	21st to end	Day	46% 3 10% 20% 15% 6%	1730
March	1st to 10th	Day	47% 4 7% 20% 16% 8%	4688
	11th to 20th	Day	31% 4 8% 27% 22% 8%	5090
	21st to end	Day	40% 5% 11% 29% 15% 1	5882
April	1st to 10th	Day	37% 4 12% 25% 19% 3	2520
	11th to 20th	Day	41% 5% 12% 21% 16% 5%	2446
	21st to end	Day	42% 6% 11% 23% 16% 1	2400
May	1st to 10th	Day	45% 9% 15% 18% 11% 1	5440
	11th to 20th	Day	45% 9% 12% 20% 12% 1	5969
	21st to end	Day	42% 6% 10% 22% 17% 3	6949
June	1st to 10th	Day	33% 8% 14% 26% 19% 2	2800
	11th to 20th	Day	27% 7% 13% 30% 19% 4	2800
	21st to end	Day	26% 8% 16% 28% 17% 5%	2800
July	1st to 10th	Day	32% 8% 12% 25% 20% 2	6291
	11th to 20th	Day	25% 9% 17% 33% 14% 2	6160
	21st to end	Day	35% 8% 15% 32% 10% 1	6240
August	1st to 10th	Day	19% 7% 16% 32% 25% 1	4092
	11th to 20th	Day	34% 7% 15% 24% 18% 3	3885
	21st to end	Day	23% 5% 12% 39% 18% 3	4311
September	1st to 10th	Day	31% 7% 11% 28% 20% 4	2400
	11th to 20th	Day	33% 5% 9% 25% 25% 3	2368
	21st to end	Day	32% 4 8% 24% 28% 4	2200
October	1st to 10th	Day	17% 2 5% 17% 43% 15%	3273
	11th to 20th	Day	23% 3 5% 21% 38% 10%	3240
	21st to end	Day	31% 3 5% 29% 27% 5%	3538
November	1st to 10th	Day	31% 5% 10% 25% 22% 7%	1886
	11th to 20th	Day	36% 3 7% 25% 24% 6%	1890
	21st to end	Day	42% 3 7% 25% 20% 2	1890
December	1st to 10th	Day	35% 4 8% 33% 18% 2	2735
	11th to 20th	Day	41% 4 9% 29% 16% 2	3085
	21st to end	Day	55% 4 11% 18% 10% 2	4070
January	1st to 10th	Night	42% 3 11% 30% 14% 1	8138
	11th to 20th	Night	31% 3 7% 26% 28% 5%	7680
	21st to end	Night	43% 4 9% 24% 17% 5%	8402
February	1st to 10th	Night	45% 3 9% 24% 17% 2	2684
	11th to 20th	Night	42% 3 10% 23% 18% 4	2459
	21st to end	Night	40% 4 9% 22% 19% 6%	2076
March	1st to 10th	Night	46% 4 6% 19% 17% 8%	5428
	11th to 20th	Night	37% 4 7% 24% 17% 11%	5090
	21st to end	Night	39% 5% 8% 31% 16% 2	5289
April	1st to 10th	Night	33% 5% 13% 25% 20% 5%	2100
	11th to 20th	Night	36% 4 10% 24% 19% 6%	2035
	21st to end	Night	42% 7% 8% 25% 17% 2	2000
May	1st to 10th	Night	45% 7% 15% 23% 10% 1	4520
	11th to 20th	Night	45% 7% 13% 21% 13% 2	3915
	21st to end	Night	44% 7% 9% 21% 15% 4	3950
June	1st to 10th	Night	31% 7% 13% 26% 21% 2	1600
	11th to 20th	Night	22% 5% 12% 30% 24% 7%	1600
	21st to end	Night	21% 7% 16% 29% 20% 8%	1600
July	1st to 10th	Night	32% 7% 13% 24% 22% 3	3580
	11th to 20th	Night	26% 8% 18% 30% 15% 3	3679
	21st to end	Night	30% 8% 18% 29% 14%	4320
August	1st to 10th	Night	18% 6% 17% 34% 23% 1	3038
	11th to 20th	Night	27% 7% 17% 28% 17% 4	3230
	21st to end	Night	21% 5% 10% 37% 23% 3	3586
September	1st to 10th	Night	27% 5% 10% 30% 22% 7%	2000
	11th to 20th	Night	32% 6% 9% 24% 25% 4	2010
	21st to end	Night	29% 5% 9% 21% 30% 6%	2200
October	1st to 10th	Night	14% 2 5% 17% 41% 20%	3902
	11th to 20th	Night	21% 3 5% 18% 38% 16%	3899
	21st to end	Night	29% 3 5% 25% 30% 8%	4252
November	1st to 10th	Night	29% 3 8% 27% 26% 6%	2631
	11th to 20th	Night	31% 3 7% 27% 24% 8%	2730
	21st to end	Night	37% 4 7% 25% 23% 3	2730
December	1st to 10th	Night	36% 4 7% 33% 18% 2	4670
	11th to 20th	Night	41% 3 9% 24% 21% 3	5341
	21st to end	Night	51% 4 11% 21% 11% 2	7150

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	26% 14% 37% 18% 4	330
	11th to 20th	Day	24% 16% 44% 15% 2	330
	21st to end	Day	18% 17% 46% 16% 3	363
February	1st to 10th	Day	23% 17% 40% 15% 5%	330
	11th to 20th	Day	28% 22% 36% 12% 2	330
	21st to end	Day	29% 19% 35% 14% 3	273
March	1st to 10th	Day	25% 16% 41% 14% 4 1	330
	11th to 20th	Day	25% 17% 42% 14% 2	330
	21st to end	Day	25% 15% 37% 16% 7%	492
April	1st to 10th	Day	19% 14% 32% 26% 7%	540
	11th to 20th	Day	23% 16% 30% 22% 8% 1	516
	21st to end	Day	20% 12% 35% 22% 9% 2	500
May	1st to 10th	Day	19% 13% 31% 25% 10% 2	503
	11th to 20th	Day	19% 7% 26% 26% 15% 7%	591
	21st to end	Day	12% 6% 28% 28% 19% 7%	789
June	1st to 10th	Day	10% 5% 19% 30% 25% 12%	730
	11th to 20th	Day	6% 3 16% 39% 24% 10%	730
	21st to end	Day	5% 3 21% 37% 25% 10%	730
July	1st to 10th	Day	9% 2 11% 28% 34% 17%	721
	11th to 20th	Day	5% 2 14% 35% 32% 12%	718
	21st to end	Day	8% 2 12% 30% 34% 15%	794
August	1st to 10th	Day	6% 1 12% 36% 31% 13%	650
	11th to 20th	Day	13% 2 12% 29% 32% 13%	519
	21st to end	Day	9% 2 8% 30% 33% 17%	583
September	1st to 10th	Day	8% 3 11% 31% 34% 13%	530
	11th to 20th	Day	10% 3 11% 26% 34% 16%	530
	21st to end	Day	15% 6% 21% 25% 22% 11%	530
October	1st to 10th	Day	9% 6% 19% 38% 21% 7%	343
	11th to 20th	Day	15% 14% 28% 25% 15% 4	330
	21st to end	Day	26% 13% 34% 17% 9% 1	363
November	1st to 10th	Day	15% 16% 33% 25% 10% 2	330
	11th to 20th	Day	15% 14% 36% 26% 10%	330
	21st to end	Day	25% 13% 33% 19% 8% 1	330
December	1st to 10th	Day	19% 16% 35% 19% 8% 2	330
	11th to 20th	Day	25% 14% 31% 20% 8% 1	330
	21st to end	Day	28% 18% 33% 19% 3	363
January	1st to 10th	Night	22% 11% 34% 28% 5%	1050
	11th to 20th	Night	20% 13% 38% 24% 4	1050
	21st to end	Night	19% 10% 41% 28% 3	1155
February	1st to 10th	Night	23% 10% 38% 27% 3	1004
	11th to 20th	Night	21% 13% 39% 24% 2	823
	21st to end	Night	23% 13% 38% 26% 2	692
March	1st to 10th	Night	22% 12% 34% 30% 3	814
	11th to 20th	Night	22% 8% 36% 29% 4	630
	21st to end	Night	20% 10% 36% 25% 9%	693
April	1st to 10th	Night	14% 10% 39% 30% 7%	630
	11th to 20th	Night	16% 12% 31% 30% 11% 1	611
	21st to end	Night	19% 6% 34% 30% 10% 1	600
May	1st to 10th	Night	16% 5% 30% 34% 14% 1	600
	11th to 20th	Night	18% 4 24% 35% 18% 2	591
	21st to end	Night	11% 5% 22% 36% 23% 3	650
June	1st to 10th	Night	9% 3 16% 38% 30% 4	600
	11th to 20th	Night	6% 1 12% 50% 28% 3	600
	21st to end	Night	4 2 16% 40% 36% 3	600
July	1st to 10th	Night	6% 2 9% 33% 43% 8%	585
	11th to 20th	Night	6% 1 6% 39% 42% 7%	582
	21st to end	Night	7% 2 8% 35% 40% 8%	657
August	1st to 10th	Night	6% 1 9% 37% 42% 6%	597
	11th to 20th	Night	8% 1 6% 35% 43% 6%	594
	21st to end	Night	7% 2 8% 34% 43% 7%	660
September	1st to 10th	Night	11% 1 9% 35% 39% 5%	600
	11th to 20th	Night	10% 1 10% 34% 37% 8%	610
	21st to end	Night	11% 4 17% 35% 28% 5%	800
October	1st to 10th	Night	8% 3 19% 39% 27% 3	800
	11th to 20th	Night	16% 5% 28% 33% 17% 1	800
	21st to end	Night	22% 6% 27% 32% 11%	880
November	1st to 10th	Night	16% 5% 30% 35% 14%	820
	11th to 20th	Night	15% 8% 33% 33% 11%	840
	21st to end	Night	19% 7% 31% 32% 10%	840
December	1st to 10th	Night	22% 8% 31% 32% 7%	1013
	11th to 20th	Night	23% 8% 29% 33% 7%	1050
	21st to end	Night	25% 11% 31% 29% 4	1155

Page generated at 2026-04-14 01:44:30. Version ac07

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