Tupelo
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Tupelo 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	12% 6% 2 6% 4 4 4 4 6% 7% 43%	100988
	Night	13% 6% 2 6% 4 4 4 3 5% 7% 47%	98439
Transparency	Day	38% 6% 10% 22% 19% 5%	104738
	Night	36% 5% 10% 21% 21% 7%	102818
Seeing	Day	14% 8% 19% 24% 22% 12%	15199
	Night	15% 6% 23% 31% 22% 4	24938

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	17% 12% 2 7% 3 3 3 3 3 5% 41%	2541
	11th to 20th	Day	21% 8% 3 5% 4 3 4 2 4 4 43%	2850
	21st to end	Day	21% 10% 2 5% 3 3 3 3 4 5% 41%	3349
February	1st to 10th	Day	19% 8% 3 5% 5% 3 4 3 4 6% 40%	1900
	11th to 20th	Day	20% 8% 3 6% 4 3 3 3 4 4 40%	1848
	21st to end	Day	22% 9% 2 6% 3 3 3 3 5% 5% 40%	1570
March	1st to 10th	Day	21% 9% 3 9% 4 5% 3 3 5% 4 33%	3120
	11th to 20th	Day	13% 6% 2 5% 5% 4 4 4 5% 8% 44%	3320
	21st to end	Day	14% 6% 2 7% 5% 5% 5% 4 5% 7% 40%	4158
April	1st to 10th	Day	12% 6% 3 5% 4 4 4 4 6% 6% 45%	2280
	11th to 20th	Day	16% 7% 2 5% 3 3 4 3 5% 5% 46%	2254
	21st to end	Day	11% 5% 2 6% 4 4 4 4 5% 8% 46%	2280
May	1st to 10th	Day	12% 6% 2 6% 4 5% 5% 4 6% 8% 42%	3792
	11th to 20th	Day	13% 6% 2 7% 5% 4 5% 3 6% 9% 40%	4081
	21st to end	Day	12% 6% 3 6% 5% 5% 5% 5% 6% 9% 39%	4476
June	1st to 10th	Day	9% 6% 2 7% 5% 5% 4 4 7% 10% 41%	2576
	11th to 20th	Day	5% 4 2 5% 5% 5% 6% 5% 8% 9% 47%	2660
	21st to end	Day	6% 3 2 5% 6% 5% 4 4 6% 8% 49%	2660
July	1st to 10th	Day	6% 5% 2 9% 6% 7% 7% 6% 9% 10% 33%	4440
	11th to 20th	Day	9% 5% 3 6% 5% 7% 8% 6% 10% 12% 30%	4390
	21st to end	Day	13% 9% 4 8% 7% 6% 6% 5% 7% 8% 27%	4197
August	1st to 10th	Day	3 2 1 5% 3 4 4 4 6% 8% 59%	3785
	11th to 20th	Day	6% 4 2 7% 4 5% 5% 4 6% 10% 47%	3729
	21st to end	Day	6% 4 2 5% 4 4 4 4 7% 7% 52%	4180
September	1st to 10th	Day	8% 5% 2 6% 5% 5% 5% 4 6% 6% 46%	2280
	11th to 20th	Day	12% 6% 2 7% 4 5% 4 3 5% 6% 45%	2154
	21st to end	Day	11% 4 1 5% 4 3 4 3 5% 7% 53%	2090
October	1st to 10th	Day	9% 4 2 5% 3 2 3 3 5% 6% 58%	2090
	11th to 20th	Day	8% 5% 1 5% 4 4 3 3 5% 6% 57%	1914
	21st to end	Day	14% 4 2 5% 3 4 3 2 3 5% 54%	2070
November	1st to 10th	Day	11% 5% 1 4 3 3 3 3 5% 6% 56%	1762
	11th to 20th	Day	12% 5% 2 5% 4 4 3 3 3 6% 54%	1800
	21st to end	Day	16% 7% 2 6% 4 4 3 3 4 7% 46%	1746
December	1st to 10th	Day	20% 9% 3 6% 5% 5% 4 3 5% 4 37%	1710
	11th to 20th	Day	15% 8% 3 6% 5% 4 4 3 4 5% 43%	2153
	21st to end	Day	14% 9% 3 7% 5% 4 5% 4 5% 6% 38%	2783
January	1st to 10th	Night	19% 10% 2 5% 4 4 4 3 4 5% 41%	4398
	11th to 20th	Night	19% 7% 2 6% 4 3 3 3 4 4 46%	4120
	21st to end	Night	22% 9% 3 5% 3 2 3 2 3 4 44%	4307
February	1st to 10th	Night	19% 8% 3 6% 3 3 3 3 4 4 43%	2280
	11th to 20th	Night	20% 8% 2 6% 4 3 3 3 4 4 43%	2218
	21st to end	Night	22% 7% 2 7% 4 4 3 3 4 6% 38%	1884
March	1st to 10th	Night	21% 10% 3 6% 4 4 3 2 4 6% 36%	3733
	11th to 20th	Night	13% 7% 2 5% 4 3 4 3 5% 6% 47%	3654
	21st to end	Night	18% 7% 3 7% 4 4 4 3 4 5% 42%	3471
April	1st to 10th	Night	12% 6% 2 5% 4 3 4 3 5% 8% 47%	1900
	11th to 20th	Night	13% 5% 2 5% 4 3 4 3 5% 7% 50%	1875
	21st to end	Night	11% 6% 2 6% 4 4 3 4 5% 6% 50%	1900
May	1st to 10th	Night	14% 7% 2 6% 4 3 4 3 5% 8% 44%	3098
	11th to 20th	Night	13% 7% 2 7% 4 4 4 3 5% 7% 45%	2812
	21st to end	Night	9% 5% 2 6% 4 5% 5% 5% 7% 10% 43%	3079
June	1st to 10th	Night	7% 5% 2 7% 5% 5% 5% 4 5% 10% 46%	1597
	11th to 20th	Night	4 4 1 3 4 3 4 4 7% 11% 55%	1520
	21st to end	Night	4 4 1 4 3 3 4 4 6% 11% 54%	1520
July	1st to 10th	Night	4 6% 2 6% 6% 5% 5% 5% 8% 13% 40%	2530
	11th to 20th	Night	7% 5% 2 5% 4 4 4 6% 7% 12% 44%	2562
	21st to end	Night	9% 9% 4 10% 6% 6% 5% 5% 7% 9% 30%	3343
August	1st to 10th	Night	1 2 1 3 3 3 3 3 6% 9% 65%	3144
	11th to 20th	Night	3 3 2 5% 4 4 4 4 7% 11% 54%	3100
	21st to end	Night	5% 4 2 5% 4 4 4 4 6% 10% 54%	3476
September	1st to 10th	Night	8% 5% 2 5% 4 5% 5% 4 6% 7% 49%	1900
	11th to 20th	Night	12% 5% 1 6% 4 3 4 3 6% 7% 48%	2005
	21st to end	Night	8% 5% 2 4 3 3 3 3 5% 8% 55%	2090
October	1st to 10th	Night	7% 2 1 4 3 3 3 2 4 7% 64%	2090
	11th to 20th	Night	10% 5% 2 5% 3 3 3 2 5% 6% 56%	2263
	21st to end	Night	15% 5% 2 5% 3 3 3 2 3 5% 54%	2527
November	1st to 10th	Night	11% 5% 2 5% 3 3 3 3 5% 6% 54%	2536
	11th to 20th	Night	11% 6% 2 5% 4 3 3 3 5% 6% 53%	2600
	21st to end	Night	16% 5% 2 5% 3 3 3 3 4 5% 50%	2529
December	1st to 10th	Night	18% 7% 3 6% 4 3 3 3 4 5% 43%	2470
	11th to 20th	Night	15% 6% 2 7% 3 3 3 3 3 5% 49%	3042
	21st to end	Night	16% 7% 3 6% 5% 5% 5% 4 6% 7% 36%	4866

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	46% 3 6% 20% 21% 3	2542
	11th to 20th	Day	45% 4 7% 21% 21% 2	2850
	21st to end	Day	45% 3 7% 20% 21% 3	3349
February	1st to 10th	Day	46% 4 8% 19% 18% 5%	1900
	11th to 20th	Day	48% 4 5% 19% 19% 6%	1858
	21st to end	Day	48% 4 7% 15% 20% 7%	1570
March	1st to 10th	Day	53% 5% 8% 10% 14% 10%	3120
	11th to 20th	Day	38% 5% 8% 24% 17% 7%	3320
	21st to end	Day	44% 5% 10% 20% 19% 3	4158
April	1st to 10th	Day	38% 6% 9% 22% 19% 6%	2280
	11th to 20th	Day	39% 5% 7% 20% 21% 7%	2254
	21st to end	Day	35% 5% 9% 26% 22% 2	2280
May	1st to 10th	Day	38% 8% 9% 28% 14% 2	3827
	11th to 20th	Day	40% 8% 14% 25% 12% 1	4085
	21st to end	Day	40% 8% 11% 27% 12% 1	4489
June	1st to 10th	Day	37% 8% 12% 22% 19% 3	2576
	11th to 20th	Day	30% 8% 13% 25% 20% 3	2660
	21st to end	Day	32% 7% 15% 23% 18% 4	2660
July	1st to 10th	Day	40% 11% 18% 21% 8% 2	4371
	11th to 20th	Day	40% 10% 19% 25% 6% 1	4315
	21st to end	Day	53% 8% 12% 20% 7%	4064
August	1st to 10th	Day	21% 7% 12% 36% 23% 2	3773
	11th to 20th	Day	32% 8% 15% 27% 16% 2	3765
	21st to end	Day	29% 7% 12% 23% 25% 4	4179
September	1st to 10th	Day	35% 8% 12% 22% 18% 6%	2280
	11th to 20th	Day	40% 6% 12% 14% 23% 6%	2154
	21st to end	Day	30% 5% 11% 23% 21% 9%	2090
October	1st to 10th	Day	19% 3 5% 15% 31% 27%	3480
	11th to 20th	Day	18% 2 5% 20% 36% 19%	3154
	21st to end	Day	26% 2 5% 24% 33% 10%	3384
November	1st to 10th	Day	30% 4 9% 19% 28% 9%	1762
	11th to 20th	Day	34% 3 6% 19% 29% 9%	1800
	21st to end	Day	40% 3 7% 20% 24% 5%	1746
December	1st to 10th	Day	50% 4 5% 17% 17% 5%	1710
	11th to 20th	Day	45% 3 6% 20% 21% 5%	2150
	21st to end	Day	45% 4 11% 21% 17% 2	2783
January	1st to 10th	Night	47% 3 6% 16% 25% 3	4398
	11th to 20th	Night	43% 4 6% 22% 21% 5%	4120
	21st to end	Night	46% 2 6% 21% 20% 4	4307
February	1st to 10th	Night	45% 3 7% 19% 20% 5%	2280
	11th to 20th	Night	46% 3 6% 18% 20% 7%	2219
	21st to end	Night	48% 4 6% 15% 18% 9%	1884
March	1st to 10th	Night	50% 4 10% 13% 15% 9%	3733
	11th to 20th	Night	37% 4 8% 21% 20% 9%	3654
	21st to end	Night	46% 3 7% 18% 23% 3	3471
April	1st to 10th	Night	36% 4 11% 23% 20% 7%	1900
	11th to 20th	Night	35% 4 7% 21% 25% 9%	1875
	21st to end	Night	34% 6% 9% 24% 22% 5%	1900
May	1st to 10th	Night	39% 6% 11% 24% 18% 2	3128
	11th to 20th	Night	39% 7% 14% 25% 13% 2	2813
	21st to end	Night	34% 10% 12% 26% 16% 2	3087
June	1st to 10th	Night	34% 8% 12% 23% 20% 3	1597
	11th to 20th	Night	23% 8% 15% 27% 24% 4	1520
	21st to end	Night	24% 7% 18% 24% 23% 5%	1520
July	1st to 10th	Night	33% 10% 23% 23% 9% 2	2490
	11th to 20th	Night	30% 9% 22% 29% 8% 2	2514
	21st to end	Night	50% 8% 14% 19% 9% 1	3237
August	1st to 10th	Night	16% 6% 13% 36% 28% 2	3132
	11th to 20th	Night	23% 8% 22% 28% 17% 2	3130
	21st to end	Night	26% 7% 14% 20% 26% 6%	3476
September	1st to 10th	Night	32% 7% 13% 21% 20% 7%	1900
	11th to 20th	Night	36% 6% 11% 17% 23% 6%	2005
	21st to end	Night	28% 6% 10% 23% 25% 9%	2090
October	1st to 10th	Night	17% 4 6% 16% 31% 27%	3480
	11th to 20th	Night	20% 2 5% 15% 32% 26%	3762
	21st to end	Night	24% 3 5% 25% 28% 16%	4151
November	1st to 10th	Night	32% 4 9% 20% 25% 11%	2536
	11th to 20th	Night	32% 3 7% 18% 28% 11%	2600
	21st to end	Night	37% 3 7% 21% 24% 8%	2529
December	1st to 10th	Night	44% 4 7% 20% 21% 4	2470
	11th to 20th	Night	39% 3 6% 20% 26% 5%	3044
	21st to end	Night	46% 4 11% 19% 15% 5%	4866

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	23% 21% 32% 18% 7%	270
	11th to 20th	Day	25% 19% 34% 14% 4 3	270
	21st to end	Day	20% 18% 40% 19% 3	297
February	1st to 10th	Day	21% 18% 34% 18% 9% 1	270
	11th to 20th	Day	32% 16% 34% 14% 3 1	270
	21st to end	Day	34% 17% 36% 11% 2	225
March	1st to 10th	Day	24% 16% 30% 21% 6% 1	270
	11th to 20th	Day	17% 20% 36% 23% 3 1	270
	21st to end	Day	19% 13% 33% 25% 8% 1	499
April	1st to 10th	Day	17% 16% 27% 26% 12% 1	460
	11th to 20th	Day	19% 14% 27% 25% 12% 3	452
	21st to end	Day	15% 13% 23% 30% 15% 3	460
May	1st to 10th	Day	16% 9% 24% 29% 18% 5%	463
	11th to 20th	Day	10% 6% 22% 29% 20% 13%	487
	21st to end	Day	10% 4 18% 27% 26% 14%	529
June	1st to 10th	Day	11% 4 13% 28% 28% 16%	596
	11th to 20th	Day	6% 3 11% 26% 35% 18%	680
	21st to end	Day	9% 2 11% 26% 33% 19%	680
July	1st to 10th	Day	8% 2 8% 25% 35% 23%	671
	11th to 20th	Day	8% 2 6% 22% 32% 30%	668
	21st to end	Day	8% 2 6% 22% 35% 28%	585
August	1st to 10th	Day	6% 1 6% 21% 41% 25%	486
	11th to 20th	Day	9% 2 9% 27% 34% 19%	479
	21st to end	Day	12% 2 9% 17% 30% 29%	539
September	1st to 10th	Day	10% 2 7% 23% 40% 18%	490
	11th to 20th	Day	12% 2 11% 22% 32% 21%	490
	21st to end	Day	13% 3 10% 28% 32% 14%	490
October	1st to 10th	Day	8% 2 18% 29% 31% 13%	490
	11th to 20th	Day	9% 8% 27% 35% 17% 4	314
	21st to end	Day	19% 8% 23% 30% 16% 4	330
November	1st to 10th	Day	16% 9% 25% 28% 19% 3	300
	11th to 20th	Day	14% 11% 36% 29% 9% 2	300
	21st to end	Day	17% 17% 26% 22% 14% 4	282
December	1st to 10th	Day	25% 15% 30% 20% 9%	270
	11th to 20th	Day	18% 15% 33% 22% 10% 2	270
	21st to end	Day	23% 16% 34% 22% 4 1	297
January	1st to 10th	Night	22% 11% 34% 27% 6%	950
	11th to 20th	Night	26% 10% 32% 25% 7%	950
	21st to end	Night	21% 9% 38% 29% 3	911
February	1st to 10th	Night	24% 9% 33% 30% 4	760
	11th to 20th	Night	24% 12% 31% 30% 3	743
	21st to end	Night	25% 11% 38% 23% 2	628
March	1st to 10th	Night	18% 11% 32% 33% 6%	760
	11th to 20th	Night	20% 8% 35% 30% 7%	679
	21st to end	Night	19% 8% 33% 29% 11%	627
April	1st to 10th	Night	15% 9% 32% 31% 12%	570
	11th to 20th	Night	15% 7% 29% 35% 13% 1	563
	21st to end	Night	14% 4 32% 35% 13% 1	570
May	1st to 10th	Night	13% 5% 25% 35% 20% 2	570
	11th to 20th	Night	12% 3 22% 34% 25% 4	561
	21st to end	Night	9% 1 12% 40% 32% 6%	617
June	1st to 10th	Night	7% 3 12% 37% 35% 7%	570
	11th to 20th	Night	4 1 8% 34% 44% 9%	570
	21st to end	Night	5% 1 8% 31% 45% 10%	570
July	1st to 10th	Night	6% 1 6% 26% 50% 12%	555
	11th to 20th	Night	7% 1 5% 23% 47% 18%	552
	21st to end	Night	6% 1 5% 25% 48% 14%	624
August	1st to 10th	Night	4 5% 25% 52% 13%	567
	11th to 20th	Night	6% 1 5% 31% 46% 11%	564
	21st to end	Night	9% 1 7% 23% 49% 11%	627
September	1st to 10th	Night	11% 1 8% 32% 43% 5%	570
	11th to 20th	Night	12% 1 11% 30% 40% 6%	675
	21st to end	Night	10% 3 13% 32% 39% 4	760
October	1st to 10th	Night	8% 2 13% 38% 33% 5%	760
	11th to 20th	Night	13% 4 20% 41% 21% 1	760
	21st to end	Night	18% 4 20% 35% 21% 2	836
November	1st to 10th	Night	15% 4 21% 37% 22% 2	780
	11th to 20th	Night	12% 8% 31% 37% 12% 1	800
	21st to end	Night	18% 8% 27% 33% 13% 1	779
December	1st to 10th	Night	21% 9% 31% 31% 8% 1	760
	11th to 20th	Night	20% 7% 33% 31% 9%	760
	21st to end	Night	25% 9% 31% 29% 6%	1040

Page generated at 2024-11-22 07:02:28. Version ac07

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