Jackson (MS)
Clear Sky Chart
History

This sumarizes the distribution of each different forecast outcome for the Jackson (MS) clear sky chart from 2005-11-06 to 2024-11-04.

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	11% 6% 2 6% 5% 5% 5% 4 6% 8% 42%	100373
	Night	12% 6% 2 6% 4 4 4 4 6% 7% 46%	98614
Transparency	Day	39% 5% 11% 20% 19% 7%	104077
	Night	36% 5% 10% 20% 20% 9%	103050
Seeing	Day	13% 9% 21% 25% 23% 10%	15014
	Night	14% 7% 23% 30% 21% 4	24719

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	16% 12% 3 5% 3 3 3 3 5% 6% 41%	2847
	11th to 20th	Day	16% 7% 2 6% 3 3 3 3 5% 5% 47%	2850
	21st to end	Day	22% 10% 2 6% 3 3 3 3 4 5% 41%	3229
February	1st to 10th	Day	15% 11% 3 7% 5% 3 4 3 4 5% 40%	1900
	11th to 20th	Day	21% 8% 3 5% 4 3 4 2 5% 5% 40%	1848
	21st to end	Day	17% 8% 3 7% 5% 4 3 4 4 5% 39%	1570
March	1st to 10th	Day	21% 10% 3 9% 4 4 4 3 5% 6% 29%	3239
	11th to 20th	Day	16% 8% 2 6% 4 5% 5% 4 7% 8% 35%	3480
	21st to end	Day	13% 8% 3 8% 6% 4 5% 4 5% 6% 39%	4005
April	1st to 10th	Day	11% 6% 3 7% 5% 4 5% 4 6% 7% 44%	2280
	11th to 20th	Day	15% 7% 2 7% 4 4 3 3 6% 7% 42%	2254
	21st to end	Day	8% 5% 2 6% 4 5% 5% 4 5% 9% 47%	2280
May	1st to 10th	Day	10% 6% 2 5% 5% 5% 5% 4 7% 10% 40%	3765
	11th to 20th	Day	12% 6% 3 6% 5% 4 4 3 6% 7% 44%	3764
	21st to end	Day	8% 4 2 6% 5% 4 5% 5% 8% 11% 43%	4319
June	1st to 10th	Day	9% 5% 1 6% 5% 7% 6% 5% 8% 10% 37%	2614
	11th to 20th	Day	5% 5% 2 6% 5% 6% 7% 5% 8% 9% 42%	2660
	21st to end	Day	5% 4 2 6% 6% 7% 7% 5% 8% 10% 39%	2634
July	1st to 10th	Day	5% 5% 3 8% 8% 7% 9% 7% 9% 11% 29%	4120
	11th to 20th	Day	7% 5% 3 7% 5% 7% 8% 7% 10% 12% 30%	4120
	21st to end	Day	11% 8% 4 10% 7% 6% 7% 5% 8% 9% 26%	4289
August	1st to 10th	Day	3 3 1 4 3 4 4 4 6% 7% 63%	3785
	11th to 20th	Day	4 3 2 5% 5% 5% 5% 5% 7% 11% 46%	3729
	21st to end	Day	8% 4 2 6% 5% 6% 5% 4 6% 8% 45%	4180
September	1st to 10th	Day	8% 5% 2 7% 7% 5% 7% 5% 6% 8% 41%	2280
	11th to 20th	Day	12% 6% 2 7% 4 5% 5% 4 5% 7% 43%	2228
	21st to end	Day	9% 4 2 4 3 3 4 4 5% 8% 53%	2090
October	1st to 10th	Day	6% 4 1 5% 4 3 4 3 4 6% 59%	1979
	11th to 20th	Day	8% 5% 2 5% 4 3 3 3 5% 6% 56%	1900
	21st to end	Day	12% 5% 2 4 3 3 3 2 3 5% 57%	2090
November	1st to 10th	Day	10% 5% 2 5% 4 3 4 3 5% 5% 55%	1887
	11th to 20th	Day	11% 7% 2 4 4 3 3 4 4 6% 52%	1710
	21st to end	Day	15% 7% 2 5% 4 4 3 3 4 6% 47%	1710
December	1st to 10th	Day	16% 8% 2 6% 4 4 4 3 5% 7% 41%	1710
	11th to 20th	Day	14% 10% 3 7% 4 4 4 3 4 6% 42%	2108
	21st to end	Day	14% 7% 2 6% 4 3 4 3 6% 8% 42%	2920
January	1st to 10th	Night	17% 10% 2 5% 3 3 4 2 4 5% 45%	4108
	11th to 20th	Night	14% 8% 2 6% 3 3 3 3 4 5% 48%	4120
	21st to end	Night	25% 9% 2 4 3 2 2 2 3 4 43%	4432
February	1st to 10th	Night	17% 9% 3 6% 4 3 4 3 4 6% 41%	2280
	11th to 20th	Night	19% 8% 2 5% 3 3 3 3 4 5% 45%	2218
	21st to end	Night	20% 8% 3 6% 4 3 3 3 4 5% 41%	1884
March	1st to 10th	Night	20% 10% 3 7% 5% 4 3 3 5% 6% 35%	3641
	11th to 20th	Night	11% 7% 2 6% 5% 4 5% 4 6% 8% 41%	3480
	21st to end	Night	16% 7% 2 6% 4 5% 5% 4 5% 6% 40%	3612
April	1st to 10th	Night	12% 5% 2 5% 5% 4 4 4 6% 6% 47%	1900
	11th to 20th	Night	13% 6% 2 4 4 4 5% 4 5% 7% 47%	1875
	21st to end	Night	7% 5% 2 5% 3 4 4 4 6% 7% 53%	1900
May	1st to 10th	Night	9% 6% 2 5% 4 4 4 4 6% 10% 46%	3130
	11th to 20th	Night	16% 6% 2 6% 4 3 4 3 6% 8% 43%	3129
	21st to end	Night	7% 5% 2 7% 5% 5% 5% 5% 8% 10% 43%	3218
June	1st to 10th	Night	6% 6% 2 6% 6% 5% 5% 4 7% 10% 43%	1560
	11th to 20th	Night	3 4 2 3 4 4 5% 4 8% 12% 51%	1520
	21st to end	Night	4 4 2 5% 5% 4 6% 5% 8% 12% 46%	1538
July	1st to 10th	Night	5% 5% 3 8% 6% 5% 5% 6% 8% 13% 38%	2850
	11th to 20th	Night	6% 5% 3 6% 5% 5% 7% 6% 11% 14% 32%	2850
	21st to end	Night	8% 8% 4 9% 6% 5% 5% 4 7% 9% 34%	3268
August	1st to 10th	Night	2 2 1 3 3 3 4 4 6% 11% 62%	3144
	11th to 20th	Night	3 3 1 5% 4 4 5% 5% 8% 13% 48%	3100
	21st to end	Night	6% 4 2 6% 4 6% 5% 4 6% 8% 47%	3476
September	1st to 10th	Night	8% 5% 2 6% 4 5% 5% 5% 6% 9% 46%	1900
	11th to 20th	Night	8% 7% 2 6% 4 4 5% 4 6% 7% 46%	1931
	21st to end	Night	8% 4 2 4 3 4 4 4 4 6% 56%	2090
October	1st to 10th	Night	6% 3 2 4 3 3 4 3 4 6% 62%	2195
	11th to 20th	Night	10% 5% 1 4 4 3 3 3 5% 6% 56%	2280
	21st to end	Night	13% 6% 1 4 3 3 3 2 4 4 58%	2508
November	1st to 10th	Night	11% 5% 2 4 2 3 2 3 4 6% 58%	2263
	11th to 20th	Night	12% 5% 1 5% 3 3 3 3 4 6% 55%	2469
	21st to end	Night	13% 6% 2 5% 3 4 4 3 5% 6% 48%	2470
December	1st to 10th	Night	16% 6% 2 6% 4 4 3 3 4 6% 44%	2470
	11th to 20th	Night	14% 8% 2 6% 5% 5% 4 3 4 5% 45%	3078
	21st to end	Night	16% 11% 3 6% 4 3 3 3 5% 6% 41%	4727

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	44% 3 4 18% 25% 5%	2848
	11th to 20th	Day	39% 3 8% 22% 23% 6%	2850
	21st to end	Day	48% 3 6% 14% 22% 8%	3229
February	1st to 10th	Day	48% 3 7% 16% 17% 9%	1900
	11th to 20th	Day	47% 3 5% 17% 20% 8%	1858
	21st to end	Day	48% 4 7% 14% 19% 9%	1570
March	1st to 10th	Day	57% 3 7% 11% 15% 5%	3239
	11th to 20th	Day	47% 4 8% 20% 16% 5%	3480
	21st to end	Day	46% 4 7% 17% 20% 6%	4005
April	1st to 10th	Day	39% 4 9% 22% 17% 8%	2280
	11th to 20th	Day	43% 4 7% 17% 23% 6%	2254
	21st to end	Day	34% 5% 9% 25% 24% 3	2280
May	1st to 10th	Day	37% 7% 14% 25% 14% 3	3800
	11th to 20th	Day	39% 5% 12% 21% 21% 1	3768
	21st to end	Day	34% 7% 18% 29% 12% 1	4332
June	1st to 10th	Day	40% 8% 14% 24% 13% 2	2614
	11th to 20th	Day	36% 8% 16% 23% 15% 3	2660
	21st to end	Day	38% 8% 16% 23% 13% 2	2634
July	1st to 10th	Day	45% 8% 20% 19% 7% 1	4056
	11th to 20th	Day	41% 8% 28% 18% 3 1	4051
	21st to end	Day	53% 7% 12% 21% 6%	4153
August	1st to 10th	Day	20% 6% 12% 29% 30% 3	3773
	11th to 20th	Day	31% 6% 18% 30% 14% 2	3765
	21st to end	Day	37% 6% 14% 21% 18% 4	4179
September	1st to 10th	Day	39% 8% 14% 17% 16% 6%	2280
	11th to 20th	Day	41% 5% 10% 17% 20% 7%	2228
	21st to end	Day	29% 4 11% 24% 21% 10%	2090
October	1st to 10th	Day	19% 4 5% 15% 26% 32%	3291
	11th to 20th	Day	18% 3 3 14% 32% 30%	3140
	21st to end	Day	23% 2 4 17% 38% 17%	3428
November	1st to 10th	Day	32% 4 6% 17% 30% 11%	1887
	11th to 20th	Day	35% 3 6% 16% 28% 13%	1710
	21st to end	Day	40% 3 7% 18% 23% 10%	1710
December	1st to 10th	Day	43% 4 9% 19% 16% 9%	1710
	11th to 20th	Day	46% 4 6% 15% 23% 7%	2105
	21st to end	Day	40% 4 7% 21% 25% 3	2920
January	1st to 10th	Night	43% 3 5% 14% 26% 9%	4108
	11th to 20th	Night	40% 4 6% 19% 20% 11%	4120
	21st to end	Night	48% 2 4 16% 23% 6%	4432
February	1st to 10th	Night	45% 3 6% 16% 21% 9%	2280
	11th to 20th	Night	43% 4 6% 17% 21% 10%	2219
	21st to end	Night	47% 5% 6% 14% 17% 12%	1884
March	1st to 10th	Night	50% 5% 7% 16% 15% 7%	3641
	11th to 20th	Night	41% 5% 9% 20% 18% 7%	3480
	21st to end	Night	44% 4 9% 17% 21% 4	3612
April	1st to 10th	Night	36% 5% 11% 18% 19% 10%	1900
	11th to 20th	Night	37% 4 9% 20% 21% 9%	1875
	21st to end	Night	30% 4 8% 25% 27% 6%	1900
May	1st to 10th	Night	33% 7% 12% 26% 18% 4	3160
	11th to 20th	Night	40% 5% 11% 25% 17% 1	3130
	21st to end	Night	34% 7% 15% 26% 15% 3	3226
June	1st to 10th	Night	36% 6% 18% 24% 15% 2	1560
	11th to 20th	Night	26% 8% 18% 28% 16% 4	1520
	21st to end	Night	29% 7% 21% 24% 16% 3	1538
July	1st to 10th	Night	37% 10% 23% 21% 7% 2	2805
	11th to 20th	Night	37% 9% 30% 19% 4 1	2796
	21st to end	Night	46% 7% 19% 21% 7% 1	3164
August	1st to 10th	Night	17% 7% 16% 32% 26% 2	3132
	11th to 20th	Night	26% 7% 21% 32% 11% 2	3130
	21st to end	Night	35% 7% 14% 21% 19% 5%	3476
September	1st to 10th	Night	33% 8% 14% 21% 17% 7%	1900
	11th to 20th	Night	36% 6% 13% 16% 20% 9%	1931
	21st to end	Night	28% 5% 10% 24% 21% 11%	2090
October	1st to 10th	Night	17% 4 6% 16% 24% 34%	3663
	11th to 20th	Night	20% 2 4 16% 25% 33%	3779
	21st to end	Night	22% 2 5% 14% 36% 22%	4120
November	1st to 10th	Night	29% 3 7% 18% 29% 13%	2263
	11th to 20th	Night	32% 3 7% 16% 27% 15%	2469
	21st to end	Night	37% 3 7% 20% 21% 13%	2470
December	1st to 10th	Night	42% 4 9% 18% 20% 7%	2470
	11th to 20th	Night	43% 3 6% 13% 27% 8%	3080
	21st to end	Night	45% 4 6% 16% 25% 5%	4727

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% 24% 34% 15% 3 1	270
	11th to 20th	Day	26% 18% 34% 15% 6% 1	270
	21st to end	Day	25% 23% 35% 14% 3	297
February	1st to 10th	Day	19% 25% 34% 15% 6% 1	270
	11th to 20th	Day	33% 16% 36% 13% 2 1	270
	21st to end	Day	23% 28% 37% 10% 1	225
March	1st to 10th	Day	24% 16% 40% 16% 4	270
	11th to 20th	Day	21% 23% 34% 17% 4	270
	21st to end	Day	19% 18% 34% 24% 5%	411
April	1st to 10th	Day	16% 17% 33% 24% 9% 1	460
	11th to 20th	Day	21% 15% 27% 25% 10% 2	452
	21st to end	Day	11% 12% 31% 28% 17% 1	460
May	1st to 10th	Day	13% 9% 31% 29% 15% 3	463
	11th to 20th	Day	12% 4 26% 28% 21% 10%	487
	21st to end	Day	7% 5% 20% 34% 23% 12%	529
June	1st to 10th	Day	11% 3 12% 34% 27% 12%	634
	11th to 20th	Day	7% 2 12% 35% 32% 12%	680
	21st to end	Day	7% 2 10% 30% 35% 15%	680
July	1st to 10th	Day	4 2 8% 30% 39% 17%	671
	11th to 20th	Day	7% 3 3 19% 41% 26%	668
	21st to end	Day	8% 2 6% 24% 40% 20%	638
August	1st to 10th	Day	5% 2 7% 24% 37% 26%	486
	11th to 20th	Day	7% 1 5% 21% 41% 25%	479
	21st to end	Day	14% 1 7% 21% 31% 26%	539
September	1st to 10th	Day	8% 3 10% 23% 38% 18%	490
	11th to 20th	Day	10% 3 12% 20% 37% 18%	490
	21st to end	Day	11% 4 13% 30% 30% 12%	490
October	1st to 10th	Day	6% 5% 21% 36% 21% 10%	379
	11th to 20th	Day	9% 7% 24% 34% 20% 5%	300
	21st to end	Day	18% 9% 25% 25% 17% 6%	330
November	1st to 10th	Day	14% 7% 26% 38% 11% 4	279
	11th to 20th	Day	15% 13% 36% 24% 11% 1	270
	21st to end	Day	13% 20% 36% 15% 14% 2	270
December	1st to 10th	Day	21% 16% 37% 19% 7% 1	270
	11th to 20th	Day	20% 15% 35% 23% 7% 1	270
	21st to end	Day	20% 21% 34% 18% 7% 1	297
January	1st to 10th	Night	21% 14% 32% 27% 5%	950
	11th to 20th	Night	21% 14% 33% 26% 7%	950
	21st to end	Night	23% 14% 33% 27% 4	984
February	1st to 10th	Night	22% 11% 35% 28% 5%	760
	11th to 20th	Night	24% 15% 31% 25% 5%	743
	21st to end	Night	24% 17% 37% 21% 1	628
March	1st to 10th	Night	17% 14% 32% 30% 6%	707
	11th to 20th	Night	15% 10% 38% 29% 7% 1	570
	21st to end	Night	17% 8% 37% 29% 8%	627
April	1st to 10th	Night	15% 11% 35% 27% 12% 1	570
	11th to 20th	Night	14% 9% 37% 28% 11% 1	563
	21st to end	Night	10% 6% 34% 36% 13% 1	570
May	1st to 10th	Night	11% 4 30% 37% 16% 2	570
	11th to 20th	Night	10% 4 22% 40% 21% 3	561
	21st to end	Night	6% 2 18% 36% 31% 7%	617
June	1st to 10th	Night	8% 2 11% 41% 32% 6%	570
	11th to 20th	Night	4 1 9% 35% 42% 9%	570
	21st to end	Night	5% 2 9% 26% 45% 13%	570
July	1st to 10th	Night	6% 1 7% 26% 47% 13%	555
	11th to 20th	Night	5% 1 5% 24% 47% 18%	552
	21st to end	Night	4 1 4 27% 50% 13%	624
August	1st to 10th	Night	3 1 4 24% 49% 20%	567
	11th to 20th	Night	6% 1 5% 23% 50% 15%	564
	21st to end	Night	11% 2 6% 25% 41% 17%	627
September	1st to 10th	Night	8% 2 9% 31% 43% 8%	570
	11th to 20th	Night	8% 3 9% 28% 44% 8%	601
	21st to end	Night	10% 2 11% 33% 37% 6%	760
October	1st to 10th	Night	6% 1 17% 38% 31% 7%	760
	11th to 20th	Night	12% 4 23% 35% 23% 3	760
	21st to end	Night	16% 6% 22% 32% 23% 3	836
November	1st to 10th	Night	13% 6% 20% 37% 20% 3	755
	11th to 20th	Night	13% 8% 29% 33% 15% 1	760
	21st to end	Night	16% 8% 31% 31% 13% 2	760
December	1st to 10th	Night	19% 8% 31% 32% 10%	760
	11th to 20th	Night	20% 10% 31% 31% 9%	783
	21st to end	Night	24% 12% 31% 27% 6%	1045

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